Do you have a good supply of paper for the chart recorder? If not, whether the chart recorder works is moot! Personally I think the X-Y output module is more useful: at least that can be fed to a digitising scope.
The service manual is worth reading. There are minor differences between the civilian and the military (Patriot battery) manuals, but nothing that I have found significant.
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On 29/11/21 22:14, Reginald Beardsley via groups.io wrote:
My 1502 arrived today.
Unfortunately, I either have a fault in the RECORD function or completely misunderstand the manual.
The paper feeds if I push the switch up. However, I do not get an accurate trace and the CRT sweep stops until I power cycle it. If I push the switch down and hold it for a photo the sweep also stops. When I release the switch the paper feeds.
I did get a couple of sweeps in the form of a vertical line about 1 division high which tracked the shorted BNC connector waveform but nothing I would interpret as a "flood" of the CRT at the end of the sweep to make the graticule visible..
I fed the BNC signal to a 200 MHz DSO which revealed that the 1502 is producing alternating 4.8 and 11.1 microsecond pulses at ~25.5 kHz.
I'd planned to measure the rise time of the 1502 pulse on an 11801 but I can't see how I can do that if the pulse periods alternate.
Happily, it does appear to be able to resolve discontinuities in cable adapters and connectors in a manner comparable to and 11801 &SD-24.
Can anyone explain what is going on? I'm about to start reading the service manual.
