Making Measurements 2
Keysight E-Series E9300 Operating and Service Guide 37
3 Press and use the , , or to set the averaging
you require. Confirm your entry by pressing .
Switch off step detection as follows:
1 Press , , .
2 Press the softkey to access the filter menu.
3 Press to highlight .
The section “Setting the Range, Resolution and Accuracy” in the Keysight EPM
series power meters Programming Guide shows you how to configure these
parameters using the remote interface.
Achieving stable results with GSM signals
Signals with a pulse repetition frequency (PRF) close to a multiple or sub-multiple
of the 220 Hz chopper-amplifier signal generate a beat note at a frequency
between the PRF and 220 Hz. Control over the filter settings is again required to
obtain stable results.
The PRF of a GSM signal is approximately 217 Hz and thus requires more
averaging than most other TDMA signals. To achieve a stable measurement use
the filter setting procedures to set the . Experimentally, a
setting of 148 gives optimum results although settings in the order of 31 or 32
give acceptable results if a faster measurement is required.
You should also ensure the filter is not reset when a step increase or decrease in
power is detected by switching the step detection off.
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