With an oscilloscope, what does your Recorder output on the back look like? From the manual:
"RECORDER OUTPUT: 0 to 100mV analog output proportional to meter deflection. Output impedance is 1kOhm."
Is it DC or is there a lot of noise on it?
Sorry for the late response, I just checked and there is lots of noise on the Recorder Output. I suspect you found the same.
Thanks for checking it. Yes, mine has the noise. I just found my notes. It appears to have a 2.3 kHz component to it. It doesn't seem correlated to either 60 Hz power or to the 100 kHz conversion oscillator circuit.
I was able to get fairly clean DC with a large electrolytic capacitor on the output terminals. The signal is basically the same that goes to the meter element. The mechanical momentum of it is able to damp out the noise.
Anyway, the electrolytic capacitor is not really the best solution for various reasons, and I was getting too deep in it for what I needed at the time. Eventually I will try to find a more elegant solution.