[volt-nuts] FET HP3456A
tonygreen924 at inbox.com
Tue Apr 1 22:13:56 EDT 2014
I have been troubleshooting a HP3456A voltmeter.
Its giving a stange fault, but I beleive I have nailed it down. The unit is reading +10.00000 volts input at +9.99661 volts. If you reverse the input, it reads correct at -10.00000 volts. All other ranges read correct on either polarity.
What I need is a source for the FET A20 Q109 or a suitable substitute. Its HP part number 1855-0298, it was made originally by USA mfg 02883 - Siliconix, Inc, Santa Clara, CA. It crosses to NSN 5961-01-135-1324. And Vishay has bought them and the part number is now obselete.
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