HP 8153A - Page 154

FETCh Commands
This command relates to measuring signals with the sensor modules.
Ikble 8-3. FETCh Command Summary
Command Parameter
FETCh[l|2]
E:SCALar]
; POWER
[:DC]?
Specifying the Channel
You specify the channel by attaching a numeric suffix to the FETCh mnemonic.
You access channel A by using FETCh 1, you access channel B by using FETCh2.
If you do not add a suffix to the mnemonic, channel A is assumed.
FETCh[:SCALar]:POWer[:DC]
Syntax FETChll|2][ :SCALar]:POWer[: DC]?
Response <value>
Description This command gets a reading from the module. It does
not provide it’s own triggering and so must be used with
either a continuous or a preceding immediate trigger. The
value read back is a floating point number in exponential
number (NR3). The units of the number read back depend
on whether the absolute or relative measurement mode
is being used, and which units have been selected. The
possible units are Watts, dBm, or dB.
For averaging times of i second or less, a new
measurement is available at the end of the averaging
8 time. This is drawn in Figure 8-1. A measurment is
available at the first x if an immediate trigger is used.
A measurement is available display at each x when
continuous triggering is used.
84 Remote Operation • Commands