Boonton 4540 Peak Power Meter User Manual - Manual (Page 158)

Boonton 4540 Series RF Power Meter
Remote Operation 5-24
FETCh:ARRay:AMEAsure:TIMe?
Description: Returns an array of the current automatic timing measurements performed on a periodic pulse
waveform. Measurements performed are: the frequency, period, width, offtime and duty cycle of
the pulse waveform, and the risetime and falltime of the edge transitions. For each of the
measurements to be performed, the appropriate items to be measured must be visible on the
display in GRAPH mode. Pulse frequency, period, offtime and duty cycle measurements require
that an entire cycle of the pulse waveform (minimum of three edge transitions) be present. Pulse
width measurement requires that at least one full pulse is visible, and is most accurate if the pulse
width is at least 0.4 divisions (20 pixels). Risetime and falltime measurements require that the
edge being measured is visible, and will be most accurate if the transition takes at least 0.1
divisions (5 pixels). It is always best to have the power meter set on the fastest timebase possible
that meets the edge visibility restrictions. Set the trace averaging as high as practical to reduce
fluctuations and noise in the pulse timing measurements. Note that the timing of the edge
transitions is defined by the settings of the SENSe:PULSe:DISTal, :MESIal and :PROXimal
settings; see the descriptions for those commands. Units are the same as the channel’s units.
Syntax: FETCh[1|2]:ARRay:AMEAsure:TIMe?
Returns: CC1, PulseFreq, CC2, PulsePeriod, CC3, PulseWidth, CC4, Offtime, CC5, DutyCycle, CC6,
Risetime, CC7, Falltime, CC8, EdgeDly, CC9, Skew in seconds
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:CW:POWer?
Description: Returns the current average, maximum, minimum powers or voltages and the peak-to-average
ratio of the specified channel. Units are the same as the channel’s units. Note the peak-to-average
ratio is returned in dB for logarithmic channel units, and percent for all other channel units.
Note that the values for maximum and minimum power will depend on the peak hold mode; see
the description of the CALCulate:PKHLD command for details.
Syntax: FETCh[1|2]:ARRay:CW:POWer?
Returns: CC1, Pavg, CC2, Pmax, CC3, Pmin, CC4, PkToAvgRatio
Where the CCn’s are the measurement condition codes for each measurement.
Valid Modes: Modulated and Statistical.