Achieving Stable Results With Gsm Signals - Keysight N1911A User Manual

5 Using E9300 E-Series Power Sensors
5 press
6 Use the numeric keys to enter the required value.
7 Press
You should also ensure the filter is not reset when a step increase or decrease in
NOTE
power is detected by switching the step detection off.
Procedure
Switch off step detection as follows:
1 Press
2 Use the
3 Press
4 Press

Achieving stable results with GSM signals

Signals with a pulse repetition frequency (PRF) close to a multiple or sub-multiple
of the 440 Hz chopper-amplifier signal generate a beat note at a frequency
between the PRF and 440 Hz. Control over the filter settings is again required to
obtain stable results.
TIP
196
to display the Meas Avg Count pop-up.
Enter to complete the entry.
.
On dual channel meters, select the required channel.
and keys to select the Step Detect setting field.
to check the step detection to Off.
key to close the Channel Setup screen.
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
Length
Experimentally, a
although settings in the order of 31 or 32 give acceptable results if a
faster measurement is required.
setting of 148 gives optimum results
Keysight N1911A/1912A User's Guide
Length
.