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1689 LCR Meter Specifications

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zrq:
Testing a 10k VHP102Z versus frequency, resistor mounted on a Tonghui test fixture and resistance expressed as derivation from 10.000kOhm to get the most resolution. The consistency at low frequencies (<10k) are great, while I'm not sure if the derivation at higher frequencies is from the resistor (and its leads) or error of the Digibridge itself.
Also attached the allan variance of the resistor reading (expressed as ppm of 10.000kOhm), before and after sequence of switching to 1.22 kHz and back to 1kHz to avoid the noisy state.

zrq:
I did some more elaborate characterization of the noise of my 1693 LCR meter measuring a 363 Ohm calibration resistor made of Vishay S102 at different frequencies. Every point is the standard deviation of 100 consequent measurements at slow speed (~ 1Hz). The % and DQ in ppm mode is used to get the best resolution. The accuracy is great, 1kHz reading is within 20 ppm (resolution limited, improve to noise limited <10 ppm if using the % readout) compared to the DC value by my Keithley 2001M and L4411A (which differs from each other by 3.6 ppm). However, the noise is not so good and the minimum is about 2 ppm of reading in the comfort zone of 300 Hz to 3 kHz. The noise greatly increases to 0.02% at 200 kHz. Of course, one should not expect such 80s' technology to compete with new Tonghuis' that can use modern Msps 16bits ADC to get 6 digits of stable reading at a wide range of frequencies.

In addition, I did some characterization of a 50 Ohm load at different frequencies with a improvised four terminal to BNC adapter. The slight difference in the blue is showing the sign flip. This should give a upper bound of the frequency flatness of the reading.

I also attached a crude python driver for the 1659/89/93 with the older GPIB card using pyVISA. It's a bit tricky to initialize the communication as one need to issue control_atn to make the GPIB card a listener. The go to local function is still with some minor catches so use with care (1689/93 have no capability of going back to local though the front panel :wtf:).

zrq:
GR 1693 ROM dump is now available on KO4BB, feel free to try on GR 1689. It contains the 0.234375 kHz bug but I don't know 6502 assembly to dig it out.

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