Boonton 4500B Peak Power Meter - Manual (Page 233)

Boonton 4500B RF Peak Power Analyzer
Remote Operation 5-33
5.5.5 FETCh Queries
The FETCh? group of queries is used to return specific measurement data from a measurement cycle that has been INITiated
and is complete or free-running. FETCh? performs the data output portion of the measurement. FETCh? does not start a
new measurement, so a series of FETCh? queries may be used to return more than one set of processed measurements from a
complete set of acquired data. FETCh? usually returns the current value of measurements, and should be used anytime free
running data acquisition is taking place (INITiate:CONTinuous ON). If FETCh? is used for single measurements
(INITiate:CONTinuous OFF), no data will be returned until a measurement has been INITiated and is complete.
FETCh:ARRay:AMEAsure:POWer?
Description: Returns an array of the current automatic amplitude measurements performed on a periodic pulse
waveform. Measurements performed are: peak amplitude during the pulse, average amplitude
over a full cycle of the pulse waveform, average amplitude during the pulse, IEEE top amplitude,
IEEE bottom amplitude, and overshoot. Units are the same as the channel‘s units. Note the pulse
overshoot is returned in dB for logarithmic channel units, and percent for all other units. Also, the
pulse ―ON‖ interval used for peak and average calculations is defined by the
SENSe:PULSe:STARTGT and :ENDGT time gating settings. A full pulse (rise and fall) must
be visible on the display to make average and peak pulse power measurements, and a full cycle of
the waveform must be visible to calculate average cycle amplitude.
Syntax: FETCh[1|2|3|4|6|7]:ARRay:AMEAsure:POWer?
Returns: CC1, PulsePeak, CC2, PulseCycleAvg, CC3, PulseOnAvg, CC4, IEEE Top, CC5, IEEE Bot, CC6,
Overshoot.
Where the CCn‘s are the measurement condition codes for each measurement.
Valid Modes: Pulse mode only.
Restrictions: Timebase must be set appropriately to allow measurements (see above)
FETCh:ARRay:AMEAsure:STATistical?
Description: Returns an array of the current automatic statistical measurements performed on a sample
population. Measurements performed are: long term average, peak and minimum amplitude,
peak-to-average ratio, amplitude at each marker, statistical percent at each marker, and the sample
population size in megasamples. Note the peak-to-average ratio is returned in dB for logarithmic
channel units, and percent for all other channel units.
Syntax: FETCh[1|2|3|4|6|7]:ARRay:AMEAsure:STATistical?
Returns: CC1, Pavg, CC2, Ppeak, CC3, Pmin, CC4, PkToAvgRatio, CC5, Pwr@Mrk1, CC6, Pwr@Mrk2,
CC7, Pct@Refline1, CC8, Pct@Refline2, CC9, Sample-Count
Where the CCn‘s are the measurement condition codes for each measurement.
Valid Modes: Statistical mode only