Summit tla 100

This is an odd one. Luckily we have schematics in the tech docs and calibration instructions. When metering output meter jumps far right off the scale. I tracked it down to an opamp ic10 which was outputting -12vdc in ref to ground. I replaced opamp 10, an lf347 chip. And it was working fine for a second, then back to thevoutput metering pegged far right. The unit is passing signal and all other functions work as they should. Per calibration instructions in the tech documents, the psu... Read more