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Gate 3
Gate 4
Trigger
Gate 2
Gate 2
Gate 1
Fig.3.13 Schematic diagram of gates
For example, set the gate as shown in Fig. 3.13 to perform the following measurement:
1) Average power level of pulse: Measurement of average value of Gate 1;
2) Peak-to-average ratio: Measurement of peak value - average value of gate 1;
3) Pulse droop: Measurement of average value of Gate 3 minus average value of Gate 4;
4) Average noise: Measurement of average value of Gate 2.
The control of “Gate” is only applicable to the S81702 or S81703 series peak power sensor,, while the “Gate”-related
operation isn't involved for the S71710 series CW sensor;
When the sampling mode of the S81702 or S81703 series peak power sensor is set as “Free Run”, there will be no
“Gate”-related operation, therefore, please set the trigger mode as “Continue Trig” when setting the “Gate”.
For the Gate measurement method, the “Trace Disp” and “Digit Disp” input modes are different!
If the trace display mode is adopted, the “Gate” can only be modified by selecting [Trace Ctrl] > [Trace Gate] >gate or
the position and length of the gate can be modified through “Gates Set” or the [Left] and [Right] keys.
In the trace display mode, the average power and peak power of only one gate can be measured, which corresponds to
the mark average and mark peak automatically measured in the medium and large window display modes respectively.
In the digit display mode, the gate should be set through [Menu]>[Meas]>[Feed];
In the case of single channel, it is not allowed to modify “Channel” because the default mode is “Channel A”. In the digit
display mode, two gates can be tested in combination. There are two combinations, i.e. “F1/F2” and “F1-F2”. Users can
freely define the measurement types of gate 1 and gate 2 and freely combine various measurement types.
3.8.2 Setting of the gate position
Four gates can be set at most. The gate position relative to the trigger position is set as follows:
1) Set [Channel] >[Channel A] >[Gates Set] >[Gate Number] to select the gate setting. There are four gates in total. If
“1” is selected, the setting is applicable to “Gate 1”;
2) Use [Start Pos] to set the start position of gate 1, which corresponds to the position of “Mark 1” displayed on the
screen;
3) Use [Length] to set the length of gate 1, which corresponds to the time length between “Mark 1” and “Mark 2”
displayed on the screen, therefore, the position of “Mark 2” is “Mark 1” + “Length”;
