testing HP 4277A

Physikfan, Mon Nov 30 2020, 12:23PM

To all electronics freaks

After using the capacitance meter HP 4277A not exactly successful
to measure the self-capacitance of three electrometers,
I have checked the HP 4277A with a high-voltage air rotary capacitor with two independent capacity ranges.
Here is the high-voltage air rotary capacitor, turned in or
turned out:






The HP 4277 A allows measurement frequencies from 10 kHz to 1 MHz.
I therefore have both capacity ranges at 10 kHz and 1 MHz
Measured fully turned in or fully turned out, all values ​​in pF.

10 kHz, large capacity range, fully turned in: 145.08
1 MHz, large capacity range, fully turned in: 145.49

10 kHz, large capacity range, fully turned: 43.30
1 MHz, large capacity range, fully turned out: 43.78

10 kHz, small capacity range, fully turned in: 54.38
1 MHz, small capacity range, fully turned in: 54.24

10 kHz, small capacity range, fully turned out: 22.68
1 MHz, small capacity range, fully turned out: 22.63

The HP 4277 A seems to work fine with the air condenser, the differences at 10 kHz and 1 MHz are very small.