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Measurement Functions – The SENSe Subsystem Measurement Operations & Settings
Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition 87
command:
:FETCh[n][:CHANnel[m]][:SCAlar]:POWer[:DC]?
syntax: :FETCh[n]:[CHANnel[m]][:SCAlar]:POWer[:DC]?
description: Reads the current power meter value, or for a return loss module returns current power val-
ue at return loss diode (back reflection path). It does not provide its own triggering and so
must be used with either continuous software triggering (see
“:INITiate[n]:[CHANnel[m]]:CONTinuous?” on page 89) or a directly preceding immediate
software trigger (see “:INITiate[n]:[CHANnel[m]][:IMMediate]” on page 88).
It returns the value the previous software trigger measured. Any subsequent FETCh com-
mand will return the same value, if there is no subsequent software trigger.
parameters: none
response: The current value as a float value in dBm,W or dB.
NOTE
If the reference state is absolute, units are dBm or W.
If the reference state is relative, units are dB.
example: fetc1:pow? → +6.73370400E-04<END>
affects: All power meters, return loss modules, and attenuators with power sensors
dual sensors: Master and slave channels are independent.
command:
:FETCh[n][:CHANnel[m]][:SCAlar]:RETurnloss?
syntax: :FETCh[n]:[CHANnel[m]][:SCAlar]:RETurnloss?
description: Reads the current return loss value. It does not provide its own triggering and so must be
used with either continuous software triggering (see
“:INITiate[n]:[CHANnel[m]]:CONTinuous?” on page 89) or a directly preceding immediate
software trigger (see “:INITiate[n]:[CHANnel[m]][:IMMediate]” on page 88).
It returns the return loss value the previous software trigger measured. Any subsequent
FETCh command will return the same value, if there is no subsequent software trigger.
parameters: none
response: The current value as a float value in dB.
example: fetc1:ret? → +6.73370400E-00<END>
affects: All return loss modules