R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Instrument Functions
Analyzer Mode
SWEEPTIME The SWEEPTIME softkey enables the user to change the time axis to obtain a
higher resolution for positioning gate delay and gate length.
When this is to be done, the sweep time temporarily changes; the original value is
restored when the menu is quit.
Remote command: --
Measurement example
The modulation spectrum of a GSM 900 signal is to be measured using the gatedsweep
function. The signal is generated by a Signal Generator whose RF output is
directly connected to the RF input of R&S FSQ.
Settings on the Signal Generator:
FREQ: 802 MHz
Level: 0 dBm: Return
Digital Mod: Select: GMSK: Select
Source: Select: PRBS: Select: Return
Level Attenuation: Select: 60 dB: Return
The Signal Generator supplies a GMSK-modulated TDMA signal (GSM).
Settings on R&S FSQ:
Conventions:
[KEY] Menu called by this key. All information between the brackets
refers to this menu.
{Number} Numeric value to be entered for the parameter on hand.
SOFTKEY Softkey to be used for making a selection or entering a value.
[PRESET]
[FREQ: CENTER {802} MHz]
[SPAN {3.6} MHz]
[AMPT: REF LEVEL {0} dBm: RF ATTEN MANUAL: {10} dB]
[BW: RES BW MANUAL: {30} kHz]
[TRACE: TRACE 1 DETECTOR: RMS]
[SWEEP: SWEEPTIME MANUAL: {50} ms]
[TRIG: EXTERN
GATED TRIGGER;
GATE SETTINGS: GATE MODE EDGE; POLARITY POS
SWEEPTIME MANUAL {1} ms: GATE DELAY {300} µs:
GATE LENGTH: {250} µs]
The following figure shows the screen display for setting gate parameters. The vertical
lines for gate delay (GD) and gate length (GL) can be adjusted to the burst signal
by entering numeric values or by means of the rotary knob.
4.38 Operating Manual 1313.9681.12 - 01