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Electronics => Repair => Topic started by: wd5jfr on June 05, 2023, 09:48:17 pm

Title: HP 410C
Post by: wd5jfr on June 05, 2023, 09:48:17 pm

Got a solid state one with no red paint on the low AC meter scale.  Not sure if it's original or been upgraded to SS because it  has the  A3 0041066502 Rev E 88809F PC board.  My  410C serial No. 098A214826 and my manual is for 0982A22439. I'm having difficulty calibrating 0.5 VAC and can't find anything in my manual which refers to adjusting A8R8 ZERO ADJ  on rear of cabinet.  Any suggestions or info appreciated.
Hank

Title: Re: HP 410C
Post by: m k on June 12, 2023, 02:43:19 pm

I'm reading HP Archive manual 01556-5 from Sep-68.
Its 5-11 a. has a ZERO ADJ for DCV accuracy check.
Seems that it is a dynamic thing and for the moment.

For 0.5 VAC,
are you doing the AC voltmeter calibration?
(page 39/68 of above manual)