Manual - 8500A Series Peak Power Meter - Giga-tronics
Manual - 8500A Series Peak Power Meter - Giga-tronics
Manual - 8500A Series Peak Power Meter - Giga-tronics
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Remote Operation<br />
3.3.4 Commands for Retrieving Data From the PPM<br />
UPDC<br />
Select Update Data Continuously Mode. The PPM will output a continuous stream<br />
of power measurement data points separated by commas. Every time the PPM<br />
receives a trigger a new data point is added to the stream. The formats discussed in<br />
A and B below can then occur:<br />
A. When using the FREQ, CALA (A Cal Factor), CALB (B Cal Factor), or FPRV (Rear Panel<br />
Frequency Input) methods for detector frequency response correction (NOT FPVO), the PPM’s Linear<br />
Mode data output string for Channel A will be:<br />
PWRAnn.nnEsnn,PWRAnn.nnEsnn,PWRAnn.nnEsnn<br />
(n = linear power in watts; Esnn = exponent)<br />
This example shows a data string for 3 triggers. Subsequent triggers will produce more data points<br />
separated by commas in the form of PWRAnn.nnEsnn. If channel B is in use, the header before the data<br />
points would be PWRB instead of PWRA.<br />
The PPM’s dBm mode data output string for channel A will be:<br />
DBMAsnnn.nn,DBMAsnnn.nn,DBMAsnnn.nn<br />
(s = polarity; n = dBm)<br />
This example shows a data string for 3 triggers. Subsequent triggers will produce more data points<br />
separated by commas in the form of DBMAnn.nnEsnn. If channel B is in use, the header before the data<br />
points would be DBMB instead of DBMA.<br />
B. When using the FPVO (Rear Panel Frequency Input and Frequency Output) method for detector<br />
frequency response correction, the PPM’s Linear Mode data output string for Channel A will be in<br />
the following form:<br />
PWRAmm.mmEsee,FRQAfff.ffE+09,PWRAnn.nnEsee,FRQAggg.ggE+09<br />
(m = first power data point;<br />
f = first frequency data point;<br />
n = second power data point;<br />
g = second frequency data point;<br />
Esee = exponent for power in watts;<br />
E+09 indicates frequency is in GHz.)<br />
This example shows a data string for 2 triggers. Subsequent triggers will produce more data points<br />
separated by commas in the form of PWRAnn.nnEsnn,FRQAfff.ffE+09. If Channel B is being used, the<br />
headers before the data points would be PWRB and FRQB. See above for a description of dBm header<br />
and data formats.<br />
UPDT<br />
Select Update Data Trigger Reset Output Mode. Prepares the PPM for power<br />
measurement data taking routines using UPDN.<br />
UPDN<br />
Update Data Now. Take a power reading when the next trigger occurs. This<br />
command is only operational if the PPM is in the Update Trigger Reset Mode. See<br />
UPDT.<br />
The PPM will output a single data point each time UPDN is received. The output formats are the same as<br />
those described under UPDC. If FPVO is being used, the frequency at which the power measurement was<br />
taken is also output. See UPDC and FPVO.<br />
<strong>Manual</strong> No. 20790, Rev C, November 1998 3-23<br />
Superceded by Revision D, March 2009