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I am using the 2520 for pulsed measurement of an LED. I am having an issue with the photodetector bias voltage. According to the circuit schematic, the bias voltage on the detector 1 line should have no correlation with the source, but when I change this bias, the output current levels also change. To diagnose this problem, I am using a resistor and oscilloscope to look at the waveforms..
I have hooked up the current source outputs of the 2520 to a 10 ohm resistor and am measuring the voltage across it with an oscilloscope. With 0 bias on detector one (D1), I can see my pulsed waveform, which looks very nice. Now I change the bias on D1 to -5V. My waveform read from the oscilloscope shifts in voltage. The shape still looks the same, but now I am reading a non-zero voltage/current all of the time. Nothing is connected to my D1 input.
I am very confused about this behavior, so any help or suggestions would be appreciated.
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