Can anyone tell me how to utilize the "NULL" feature of the 431B power meter? Have both a 431B and 431C but no manuals, so am unsure if I am making proper use of this front panel null feature.
- posted
18 years ago
Nulling an HP 431B Power Meter
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- posted
18 years ago
Radra,
the "Null" feature is used to remove offsets that may arise in the internal circuitry of the power meter. So if you notice a nonzero indication of the meter with no rf power applied to the sensor, simply press the "Null" bottom to get a zero reading of the meter. Probably you may have to repeat this a number of times. You will need this feature only in the most sensible measure ranges, say 100 microwatts downward.
Regards Ulrich
"Radra" schrieb im Newsbeitrag news: snipped-for-privacy@z14g2000cwz.googlegroups.com...
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18 years ago
The carbonbased lifeform Ulrich Bangert inspired sci.electronics.equipment with:
Do not forget to terminate (50Ohm) the sensor first, otherwise the calibration is invalid. It is also advisible to let the 431 warm up first, or you'll be repeating the calibration a couple of times.
Theo
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