HP 8590 E & L Series Spectrum Analyzers and HP 8591C Cable TV ...

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FFT Fast Fourier Transform Performs a discrete fast Fourier transform on the source trace array and stores the result in the destination array. Syntax FFT - destination user-defined trace ,- window -\ user-defined trace user-defined trace Item I Description/Default User-defined trace A trace defined by the TRDEF command. I Range Any valid trace name. Prerequisite Commands: TWNDOW. Related Commands: MKREAD, TWNDOW. Restrictions: Not available with Analog+ display mode. See “ANLGPLUS” for more information. Example OUTPUT 718."IP*SNGLS*" OUTPUT 718;"CFy300MHk;TS;MKPK HI;MKTRACK ON;" OUTPUT 718;"CONTS;SP 200KHZ;RB IOOKHZ;" OUTPUT 718;"MKTRACK 0FF;SP OHZ;" OUTPUT 718;"MKPK HI;MKRL;LN;SNGLS;" OUTPUT 718;"ST 800MS;TS;" OUTPUT 718;"TWNDOW TRB,FLATTOP;" 5-160 Programming Commands Initializes spectrum anulyxer: Tunes center frequency to the carrier and decreoxes span. Changes resolution bandwidth to capture modulation. Reduces span to zero Hz to demodulate carrier Changes to linear amplitude scale, Sets sweep time to correspond to modulation frequ&ncy, the executes FFT function. The TWNDOW must be defiined before using the F~jknction.
OUTPUT 718;"FFT TRA,TRA,TRB;VIEW TRA;" OUTPUT 718;"MKPK HI;" OUTPUT 718."MKD." OUTPUT 718;"MKPi NR;" OUTPUT 718;"MKREAD FFT;" OUTPUT 718."MKF'." , * , ENTER 718;A DISP A Description FFT F&t Fourier Transform Executes the FFTjimction with the trace window function. Finds the highest signal. Activates the marker deltajim%ion. Finds the next peak to the right. Selects the FFl’ marker to display the marker delta value as a frequency instead of time value. Finds the dz@rence between the two peaks. Displays thefrequency d@Lmnce. FFT weights the source trace with the function in the window trace (the window trace is described below). The transform is computed and the results are placed in the destination trace. Unlike FFTAUTO and FFTCONTS, FFT performs the FFI’ measurement only once. Use FFTAUTO or FFI’CONTS if you want the FFT measurement to be performed at the end of every measurement sweep. The spectrum analyzer should be in linear mode when using the FF”I’ command. The FFT results are displayed on the spectrum analyzer in logarithmic scale. For the horizontal dimension, the frequency at the left side of the graph is 0 Hz, and at the right side is Fmax. Fmax can be calculated using a few simple equations and the sweep time of the spectrum analyzer. The sweep time divided by the number of trace array elements containing amplitude information is equal to the sampling period. The reciprocal of the sampling period is the sampling rate. The sampling rate divided by two yields Fmax. For example, let the sweep time of the spectrum analyzer be 20 ms and the number of trace elements be 400. The sweep time (20 ms) divided by 400 equals 50 ps, the sampling period. The sample rate is l/50 ps. Fmax equals l/50 p.s divided by 2, or 10 kHz. FFT is designed to be used in transforming zero span information into the frequency domain. Performing FF’T on a frequency sweep (when the frequency span is greater than zero) will not provide time-domain results. The windowing function stored in the window trace may be selected with the trace window (TWNDOW) command or you can store your own values in that trace. The trace window function modifies the contents of a trace array according to one of three built-in algorithms: UNIFORM, HANNING, or FLATTOI? See Figure 5-4, Figure 5-5, and Figure 5-6. The TWNDOW command multiplies a trace array with one of these windows. Selecting a window: The amplitude and frequency uncertainty of the Fourier-transformed display depends on both the choice of trace windows and the spectrum analyzer sweep time. Amplitude uncertainty is maximum when the spectral component falls midway between the filter shapes. Passbands that are flatter in shape, like the FLATTOP filter, contribute less amplitude uncertainty, but frequency resolution and sensitivity are compromised. The UNIFORM window algorithm has the least frequency uncertainty and greatest amplitude uncertainty. The UNIFORM window does not contain time-domain weighing and leaves the data alone. Use the UNIFORM window for transforming noise signals or transients that decay within one sweep time period. The UNIFORM window yields the best frequency resolution, but also produces the highest side lobes for periodic signals. Programming Commands 5-l 61
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Title & Document Type: Manual Part
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Notice. The information contained i
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Assistance Product maintenance agre
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How to Use This Guide This guide us
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Contents 1. Preparing for Use What
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4. Creating and Using Downloadable
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COMPRESS Compress Trace . . . . . .
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LSPAN Last Span . . . . . . . . . .
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RLPOS Reference-Level Position . .
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Xhbles l-l. Setting of HP ThinkJet
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Connecting the Computer to the Spec
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Test Program To test the connection
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Test Program The program shown belo
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Note Because HP-IB cables can be co
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Plotting Using an HP-IB Interface N
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Printing Using an RS-232 Interface
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Plotting Using an RS-232 Interface
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Printing Using a Parallel Interface
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Plotting to an HP LaserJet Printer
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If There Is a Problem This section
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Writing Your First Program When the
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Modifying the Program Remote operat
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Enhancing the Program with Variable
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Getting Information from the Spectr
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Programming Guidelines 1. Perform t
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Controlling Trace Data with a Compu
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Saving Trace Data The trace data in
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Reading Trace Data from a Computer
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Program Example for the HP-IB Inter
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Program Example for the RS-232 Inte
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Returning the Spectrum Analyzer to
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350 GOSUB 500 360 TR3$=TR6$ 370 12=
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330 OUTPUT @Sa;"MKPK HI; TS;" 340 O
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Program Example for the RS-232 Inte
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Different Formats for Trace Data Tr
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B Format The B format allows you to
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A-Block Format The A-block format i
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M Format The M format is for sendin
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Trace Data Format TDF P TDF B TDF A
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Creating a DLP This section contain
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To Use a User-Defined Variable with
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To Enter Values into a DLP To allow
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File name Date and author's name Pr
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Storing DLPs on a RAM Card If the s
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Determining the Amount of Memory Ne
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‘lb Delete a DIP from Spectrum An
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‘Ib Access the DLP Editor . Press
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lb Modify the DLP 1. If necessary,
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DLP Programming Guidelines This sec
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Programming Commands What You’ll
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Syntax Elements are shown in the sy
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In the syntax diagrams, characters
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NONE NR Element NRM or NORMAL NTSC
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The alternate commands (listed in t
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This functional index categorizes t
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Function Category :ALIBRATION :OMMA
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Function Category ;RAPHICS NFORMATI
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Function Category LIMIT LINES :cont
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‘Ihble 5-4. Functional Index (con
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Function Category MEASURE/USER Icon
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Function Category RECALL or SAVE lP
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Function Category 3WEEP (continued)
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RIGGER Function Category JSER-DEFIN
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ABORT Abort Stops the execution all
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ABS Absolute Places the absolute va
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ACP Adjacent Channel Power Performs
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ACPBW Channel Bandwidth ACPBW Chann
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ACPCONTM Continuous Sweep Measureme
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ACPE Adjacent Channel Power Extende
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Setting the ACPGR to - 1, does the
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ACPMK Adjacent Channel Power Marker
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ACPPAR ACP Manual or Auto ‘able 5
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ACPSP Channel Spacing Allows you to
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ACTDEF Active Function Definition C
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Example 2 ACTDEF Active Function De
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ACTDEF Active Function Definition Q
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ADD Add Adds the sources and sends
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AMB Trace A Minus Trace B AMB Trace
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Description AMB Trace A Minus Trace
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Description AMBPL Trace A Minus Tra
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80 OUTPUT 718;"AMPCOR?;" 90 ENTER 7
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ANLGPLUS Analog Plus Turns on or of
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ANNOT Annotation Turns on or off th
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AT Attenuation Specifies the RF inp
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AUNITS Amplitude Units Specifies th
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AVG Average Averages the source and
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AXB Exchange Trace A and Trace B Ex
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Query Response baud rate / \ BAUDRA
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Description The BIT places either a
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Example 10 CLEAR 718 20 OUTPUT 718;
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BML Trace B Minus Display Line Subt
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BXC Trace B Exchange Trace C Exchan
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Note Execute CAL STORE after succes
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CAT Catalog Catalogs either spectru
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Information File name File Type Dat
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CF Center Frequency Specifies the c
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CHP Channel Power Performs the chan
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CHPGR Channel Power Graph On or Off
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CLRBOX Clear Box Clears a rectangul
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CLRDSP Clear Display Erases user-ge
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CLS Clear Status Byte Clears all st
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CNF Confidence ‘I&t Performs the
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CNTLB Auxiliary Interface Control L
Page 211 and 212: CNTLD Auxiliary Interface Control L
Page 213 and 214: COMB Comb Turns on or off the comb
Page 215 and 216: Example COMPRESS Compress Trace Thi
Page 217 and 218: Example 10 OUTPUT 718;"IP;" 20 OUTP
Page 219 and 220: CORREK Correction Factors On Return
Page 221 and 222: CRTHPOS Horizontal Position of CRT
Page 223 and 224: CTA Convert to Absolute Units CE4 C
Page 225 and 226: CTM Convert to Measurement Units CT
Page 227 and 228: OUTPUT 718;"MOV DA,D,ADDRESS;" OUTP
Page 229 and 230: DATEMODE Date Mode DATEMODE Date Mo
Page 231 and 232: DET Detection Mode Selects the spec
Page 233 and 234: DISPOSE Dispose DISPOSE Dispose Fre
Page 235 and 236: DIV Divide Divides source 1 by sour
Page 237 and 238: DL Display Line DL Display Line Def
Page 239 and 240: DN Down Reduces the active function
Page 241 and 242: Description DONE Done As shown by t
Page 243 and 244: DRAWBOX Draw Box Draws a rectangula
Page 245 and 246: DSPLY Display Displays the value of
Page 247 and 248: DT Define Terminator DT Define Term
Page 249 and 250: Description Unlike enter parameter
Page 251 and 252: ENTER Enter From HP-IB Allows the s
Page 253 and 254: EP Enter Parameter Function EP Ente
Page 255 and 256: EXP Exponent Places the exponential
Page 257 and 258: Description EXP Exponent The EXP co
Page 259 and 260: Description FA Start Frequency The
Page 261: Description FB Stop Frequency The F
Page 265 and 266: 80 .90 00 0 -10 -20 -30 -40 VI -A -
Page 267 and 268: FFTAUTO Marker to Auto FFT “Measu
Page 269 and 270: FFTCONTS FFT Continuous Sweep Perfo
Page 271 and 272: FFTMM FFT Marker to Midscreen FBTMM
Page 273 and 274: FFTOFF FFTOff Exits the fast Fourie
Page 275 and 276: FFTPCTAMR FFT Percent Amplitude Mod
Page 277 and 278: FFTSNGLS uses the following when pe
Page 279 and 280: FFTSTOP FFT Stop Frequency Sets the
Page 281 and 282: FMGAIN FM Gain Sets the total FM fr
Page 283 and 284: Description FOFFSET Frequency Offse
Page 285 and 286: FS Full Span Sets the frequency spa
Page 287 and 288: Example Connect CAL OUT to the spec
Page 289 and 290: GATECTL Gate Control GATECTL Gate C
Page 291 and 292: GD Gate Delay Sets the delay time f
Page 293 and 294: GDRVGDEL Gate Delay for the Frequen
Page 295 and 296: GDRVGLEN Gate Length for the Freque
Page 297 and 298: Query Response 7< r off 7 0 I outpu
Page 299 and 300: Query Response GDRVGTIM Gate Trigge
Page 301 and 302: Query Response GDRVPRI returns the
Page 303 and 304: Query Response GDRVPWID returns the
Page 305 and 306: Query Response GDRVRBW Couple Resol
Page 307 and 308: Query Response r e f e r e n c e /
Page 309 and 310: Query Response GDRVST Couple Sweep
Page 311 and 312: GDRVSWDE Delay Sweep for Time Windo
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GDRVSWP Sweep Time for the Time Win
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GDRVUTIL Gate Utility Turns on or o
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GDRVVBW Couple Video Bandwidth to G
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GETPLOT Get Plot GETPLOT Get Plot I
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GETPRNT Get Print GETPRNT Get Print
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GL Gate Length Sets the length of t
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GR Graph Graphs the given 9 coordin
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HAVE Have Returns a “0” if the
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I 3 Bit Position Bit Status = 0 Bit
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HN Harmonic Number HN Harmonic Numb
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HNLOCK Harmonic Number Lock Once HN
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HNUNLK Unlock Harmonic Number Unloc
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ID Identify Returns the spectrum an
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Example IF TEEN ELSE ENDIF If Then
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INT Integer INT Integer Places the
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INZ Input Impedance Specifies the v
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GD GDRVGDEL GDRVGLEN GDRVRBW GDRVST
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IP Instrument Preset IP also clears
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KEYCMD Key Command KEYCMD Key Comma
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170 180 190 200 210 220 230 240 250
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KEYDEF User-Defined Key Definition
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Example 2 KEYDEF User-Defined Key D
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KEYENH Key Enhance KEYENH Key Enhan
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Example 2 KEYENH Key Enhance Use th
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KEYENH Key Enhance Softkey numbers:
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KEYLBL Key Label Relabels a softkey
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LB Label LB Label Writes text (labe
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LB Label ‘Ihble 5-6. Character Se
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LF Base Band Instrument Preset Perf
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LIMIDEL Delete Limit-Line Table Del
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LIMIDISP Limit Line Display When us
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Description LIMIFAIL returns one of
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LIMIHI Upper Limit Allows you to sp
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Description LIMILINE Limit Lines LI
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LIMILO Lower Limit Allows you to sp
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LIMIMODE Limit-Line Entry Mode LIMI
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LIMIREL Relative Limit Lines Specif
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LIMISEG Enter Limit-Line Segment fo
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LIMISEG Enter Limit-Line Segment fo
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Example OUTPUT 718;"LIMIDEL;" OUTPU
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LIMITEST Enable Limit Line ‘&stin
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LINFILL Line Fill Fills linear inte
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LN Linear Scale LN Linear Scale Spe
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LOAD Load File name: You must suppl
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LOG Logarithm Prerequisite Commands
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LSPAN Last Span Changes the spectru
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MDS Measurement Data Size For this
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Query Response base1 ine reference
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MEANTH Trace Mean Above Threshold M
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MEASOFF Measurement Off MEASOFF’
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During this relative-amplitude mode
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MENU Menu Selects and displays the
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MERGE Merge Two Traces Merges the s
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MF Marker Frequency Output Returns
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MIN Minimum MIN Minimum Compares so
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MINH Minimum Hold Updates trace C w
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MIRROR Mirror Image Displays the mi
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MKA Marker Amplitude MKA Marker Amp
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MKACT Activate Marker Specifies the
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MKBW Marker Bandwidth MKBW Marker B
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MKCONT Marker Continue Resumes the
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Description MKD Marker Delta The MK
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Query Response de t a MKDLMODE Mark
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Example MKF Marker Frequency OUTPUT
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MKFCR Marker Counter Resolution Set
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MKMIN Marker Minimum Moves the acti
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Example 10 INPUT "ENTER IN THE STAR
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Description MKNOISE Marker Noise Th
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MKP Marker Position Places the acti
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MKPAUSE Marker Pause Pauses the swe
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MKPK Marker Peak Positions the acti
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Query Response MKPX Marker Peak Exc
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MKRRAD Marker Readout MKREAD Non-Ze
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MKSP Marker to Span Sets the start
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MKSTOP Marker Stop Stops the sweep
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MKTBL Marker ‘able Restrictions T
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MKTRACK Marker Track MKTRACK Marker
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ML Mixer Level ML Mixer Level Speci
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MOD Modulo Example 10 OUTPUT 718;"V
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MOV Move Copies the source values i
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MPY Multiply Multiplies the sources
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MS1 Mass Storage Is Allows you to s
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MXM Maximum Example 10 OUTPUT 718;"
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M4 Marker Zoom Activates a single m
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NDB Number of dB Specifies the dist
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OUTPUT 718;“MOV NDBPNT,O;” Turn
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NRL Normalized Reference Level Sets
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OA Output Active Function Value Sen
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OBW Occupied Bandwidth Variable or
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OL Output Learn String Transmits in
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ONCYCLE On Cycle Description The ON
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ONDELAY On Delay Description The ON
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ONEOS On End of Sweep Description R
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ONMKR On Marker Query Response -+(
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ONMKRU On Marker Update 330 OUTPUT
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ONSRQ On Service Request Executes t
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ONSWP On Sweep Executes the list of
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Description ONTIME On Time Limit th
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OUTPUT Output to Remote Port or Par
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Description OUTPUT Output to Remote
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3 . 2 5 0 GHz o,o ATTEN 1 0 dG Figu
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‘Ihble 5-9. Spectrum Analyzer Sta
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PCIAM Percent AM the PCTAM command
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PD Pen Down PD Pen Down Instructs t
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Example OUTPUT 718;"IP;SNGLS;" OUTP
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Example PDF Probability Distributio
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Example Connect CAL OUT to the spec
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Query Response PEAKS Peaks Programm
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Query Response peaks below peaks ab
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PKRES Peak Result PKRES returns the
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PKSORT Peak Sort PKSORT Peak Sort S
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Query Response table PKTBL Peak ‘
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PKZOOM Peak Zoom PKZOOM Peak Zoom A
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PLOT Plot Initiates a plotter outpu
Page 542 and 543:
PLTPRT Plot Port PWPRT Plot Port Se
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PP Preselector Peak Peaks the prese
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PREAMPG External Preamplifier Gain
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PRINT Print Initiates a output of t
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PRNTADRS Print Address Allows you t
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PSTATE Protect State PSTATE Protect
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PURGE Purge. File Deletes the speci
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Example DISP "CONNECT CAL OUT TO IN
Page 558 and 559:
RB Resolution Bandwidth Specifies t
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RCLS Recall State RCLS Recall State
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Description RCEI’ Recall Trace Th
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REPEAT UNTIL Repeat Until The REPEA
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RESETRL Reset Reference Level Reset
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REV Revision RJW Revision Returns t
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Description RL Reference Level The
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RMS Root Mean Square Value Returns
Page 574 and 575:
RQS Service Request Mask Sets a bit
Page 576 and 577:
SAVEMENU Save Menu Saves menu 1 und
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SAVET Save Trace !&WET Save Trace S
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SAVRCLF Save or Recall Flag Indicat
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Description SAVRCLN Save or Recall
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SEGDEL Segment Delete Deletes the s
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SENTER Segment Entry for Frequency
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SENTER Segment Entry for Frequency
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SENTERT Segment Entry for Sweep Tim
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SER Serial Number Returns the seria
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SETTIME Set Time Allows you to set
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Example 10 OUTPUT 718;"IP;" 20 OUTP
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SP Span Changes the total displayed
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SPEAKER Speaker Turns on or off the
Page 602 and 603:
SQLCH Squelch Sets the squelch thre
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Example OUTPUT 718 ; "SQR SP, lE8 ;
Page 606 and 607:
SRCALC Source Leveling Control Fbr
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Description SRCAT Source Attenuator
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Description SRCNORM Source Normaliz
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SRCPSTP Source Power-Level Step Siz
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SRCPSWP Source Power Sweep Selects
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SRCPWR Source Power Selects the sou
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SRCTK Source Tracking Adjusts the t
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SRCTKPK Source Tracking Peak SRCTKP
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Bit Number Decimal Equivalent 32 16
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This displays the octal equivalent
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Example 10 CLEAR 718 20 OUTPUT 718;
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Query Response ST Sweep Time Progra
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STDEV Standard Deviation of Trace A
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STOR Store Stores data on a RAM car
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Description STOR Store The STOR com
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Example SUB Subtract OUTPUT 718;"SU
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SUMSQR Sum of Squared Trace Amplitu
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SYNCMODE Synchronize Mode Selects t
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TA Transfer A Returns trace A ampli
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TDF Trace Data Format Formats trace
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TDF Trace Data Format Example of ho
Page 649 and 650:
!IDFB TDF Trace Data Format Descrip
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TEXT lkxt Writes text on the spectr
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TIMEDATE Time Date Allows you to se
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TITLE Title Activates the screen ti
Page 657 and 658:
Query Response TM Trigger Mode QTM
Page 659 and 660:
TO1 Third-Order Intermodulation Mea
Page 661 and 662:
TRA/TRB/TRC Trace Data Input and Ou
Page 663 and 664:
TRCMEM Trace Memory TRCMEM Trace Me
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Description TRDEF Trace Define The
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TRGRPH Trace Graph Displays a compr
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TRMATH Trace Math Executes a list o
Page 671 and 672:
TRPRST Trace Preset Sets the trace
Page 673 and 674:
TS Thke Sweep Starts and completes
Page 675 and 676:
TVSFRM TV Frame Selects the type of
Page 677 and 678:
TVSTND TV Standard Selects the trig
Page 679 and 680:
TVSYNC TV Sync Selects the polarity
Page 681:
UP UP Increases the value of the ac
Page 684 and 685:
VARDEF Variable Definition Creates
Page 686 and 687:
VARIANCE Variance of Trace Amplitud
Page 688 and 689:
VAVG Video Average Enables the vide
Page 690 and 691:
VB Video Bandwidth Query Response 5
Page 692 and 693:
VIEW View Trace Displays trace A, t
Page 694 and 695:
WINNEXT Window Next When using the
Page 696 and 697:
WINON Window ON Displays the two wi
Page 698 and 699:
WINZOOM Window Zoom When using the
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XCH Exchange Example OUTPUT 718;"XC
Page 702 and 703:
ZMKCNTR Zone Marker at Center Frequ
Page 704 and 705:
ZMKPKNR Zone Marker for Next Right
Page 706 and 707:
ZMKSPAN Zone Marker Span Query Resp
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The preamplifier gain is set by usi
Page 710 and 711:
Hewlett-Packard and is available fo
Page 712 and 713:
INVALID KEYLBL: _ - - Indicates tha
Page 714 and 715:
OVEN COLD Indicates that the spectr
Page 716 and 717:
Trace A is not available Indicates
Page 718 and 719:
RS-232 and Parallel Option 043 What
Page 720 and 721:
Person0 computer Analyzer TxD 2 > >
Page 722 and 723:
Connecting a LaserJet Printer able
Page 724 and 725:
Setting the Spectrum Analyzer Baud
Page 726 and 727:
B Bl, 5-9 B2, 5-9 B3, 5-9 B4, 5-9 b
Page 728 and 729:
demodulation, 5-128 DET, 5-129 dete
Page 730 and 731:
FUNCDEF command avoiding problems,
Page 732 and 733:
limits failed, 5-272 mirror limit l
Page 734 and 735:
NRL, 5-384 NTSC triggering, 5-575 n
Page 736 and 737:
PWRUPTIME, 5-456 It Rl, 5-10 R2, 5-
Page 738 and 739:
marker step size, 5-358 STOP FREQ s
Page 740:
window next, 5-592 window off, 5-59
show all

HP 8590 E & L Series Spectrum Analyzers and HP 8591C Cable TV ...

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