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Radra
Guest
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 Posted:
Mon Apr 25, 2005 11:33 pm Post subject:
Nulling an HP 431B Power Meter |
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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.
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Ulrich Bangert
Guest
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| Posted:
Wed Apr 27, 2005 8:35 am Post subject:
Re: Nulling an HP 431B Power Meter |
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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" <radra@adelphia.net> schrieb im Newsbeitrag
news:1114453997.238898.305400@z14g2000cwz.googlegroups.com...
| Quote: | 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.
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Theo v. Werkhoven
Guest
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| Posted:
Sun May 01, 2005 4:32 pm Post subject:
Re: Nulling an HP 431B Power Meter |
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The carbonbased lifeform Ulrich Bangert inspired sci.electronics.equipment with:
| Quote: | 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.
"Radra" <radra@adelphia.net> schrieb im Newsbeitrag
news:1114453997.238898.305400@z14g2000cwz.googlegroups.com...
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.
|
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
--
theo at van-werkhoven.nl ICQ:277217131 SuSE Linux
linuxcounter.org: 99872 Jabber:muadib at jabber.xs4all.nl AMD XP2100+ 512MB
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