Operation
Manual 21568, Rev. F, March 2008
2.2.4
Sensor Triggering
A measurement will not be possible until the peak power sensor is triggered. The Series 8540
Power Meters will display
NO TRIG
until a valid trigger is received. The following trigger
verification technique is valid for both Series 8540 and 58542 VXI Power Meters:
1.
If you need to verify triggering, connect the Sample Delay output on the back of the
8035XA Series sensor to an oscilloscope using one of the SMB(plug) to BNC(m)
cables provided with the sensor. Set the scope channel to dc coupling, 1.0
µ
s per
division. Use rising edge (Normal) triggering at about 0.5 V trigger level. Set the sensor
sample delay to 2.0
µ
s.
2.
The sample delay pulse will appear each time the sensor is triggered. If a pulse does
not appear on the scope display, the sensor is not triggering. Check the triggering
configuration and adjust it if necessary. An analog oscilloscope may show a dim trace
when the repetition rate is low.
3.
A quick check that can be made on the 8540 power meter for triggering without using
an oscilloscope is to press [dB/mW] twice. This will clear the current reading and
display
NO TRIG
until a valid trigger is received.
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