Search found 13 matches

by Audio1Man
Fri Feb 08, 2019 2:28 pm
Forum: Test, Measurement and Repair
Topic: HP400F Meter Wet Slug Tantalum Capacitor Reforming
Replies: 21
Views: 5061

Re: HP400F Meter Wet Slug Tantalum Capacitor Reforming

By changing the 0.01uf cap to about 0.064uf the BW would be about 15.7 kHz, however it should only be used as a ref not a true calibrated standard.
My 2.2uf cap is about 400Hz and it is a debug tool for HUM FINDING. it is much lighter & smaller than the AP & computer.
Duke
by Audio1Man
Thu Feb 07, 2019 8:16 pm
Forum: Test, Measurement and Repair
Topic: HP400F Meter Wet Slug Tantalum Capacitor Reforming
Replies: 21
Views: 5061

Re: HP400F Meter Wet Slug Tantalum Capacitor Reforming

My old 400FL has had 2 mods I added many years ago, and it is a great tool. First I added a unity buffer to the Range Switch Output (before the meter circuit) to a BNC to be a full range linear output signal. This signal connects to the scope or spectrum analyzer. This mod removed the distortion fro...
by Audio1Man
Tue Feb 05, 2019 7:16 pm
Forum: Test, Measurement and Repair
Topic: Welcome to the Test, Measurement and Repair Forum
Replies: 11
Views: 3535

Re: Welcome to the Test, Measurement and Repair Forum

Hi All
I worked for Audio Precision for many years as and Analog Engineer, now semi-retired. I service /older AP’s and have been to answer some questions. I have a web “sound-logic-la.com”.
Duke