No big deal, I just wanted to ensure the archive doesn¡¯t mislead the next guy.
Once the OP has the multivibrator sorted out, there¡¯s a home-grown calibration technique that doesn¡¯t require the S-30 Delta Standard, just one precise capacitor and a frequency counter. (The latter wasn¡¯t commonly available when the 130 was created.) See ¡°
/g/TekScopes/topic/tpe_130_l_c_meter_calibration/7656928¡±.
If you see nonlinearity on the 3, 10, or 30 ranges, look at C94, C93, and C92. Even if they are not leaky, the paper or paper-plastic caps Tek used are prone to Dielectric Absorption and this application is sensitive to it. But take care not to over-correct ¨C those caps weren¡¯t particularly good even new, and Tek printed the meter scales to match them. I installed polypropylene caps only to find that I was (slightly) off in the opposite direction! Use polyester instead.
Dave Wise
From:
[email protected] <
[email protected]> On Behalf Of SCMenasian via groups.io
Sent: Thursday, February 17, 2022 11:21 AM
To:
[email protected]Subject: Re: [TekScopes] Type 130 L-C Meter
You're right. Sorry for the confusion.
Stephen Menasian
