ThorLabs DET10A connection in coupling AC 50 ohms digitizer

Hello

I'm scanning the signal of a ThorLabs DET10A using an adaptation NI 5772 AC FlexRIO Module.  The DET10A is 50 ohms and the 5772 is 50 ohms, but a direct link between the two does not work.  I expect pulse height N and width M, where N is the order of 1 V and M is the order of 10s of nanoseconds.  Yet the digitizer shows N * 0.1 pulse height and pulse width M * 25.  If I turn off the DET10A, does not change the 5772 reading.  If I re - turn on the DET10A, reading the 5772 is exactly the height N and M of width, but the signal breaks up to N * 0.1 and M * 25 for a second or two.  It's as if the 5772 is cast too much current or roughly the filtering of the signal.  I tried to connect the DET10A to an O-Scope Tek.  When coupling DC, the signal range is exactly N and M of width height.  When the field AC coupled with a 1 M ohms impedance, signal is perfect as well.  When the field of AC coupled with an impedance of 50 ohms, I see almost the same type of behavior decomposing as on the 5772-AC.  We tried 50ohm closing the DET10A and measurement in parallel with the terminator.  The scope and exposure 5772 mitigation and the ringtone I'd wait wrong with impedance, but the signal does not decay in this configuration.  Mitigation is somewhat tolerable, but unfortunately the ringtone will beat the algorithm on FPGA FlexRIO module.  Does anyone have suggestions for the digitization of the DET10A with a digitizer in coupling AC 50 Ohm terminated?

Thank you

Steve K

Thanks David,.

An EE figured out here the 5772 AC and AC 50 Ohm terminated Tek scope matching did not provide DET10 through a path to Earth.  All is well with the measure now.  Please consider a KB along the lines, "Use coupling AC scanners with signal Sources biased", or something like that.

Kind regards

-Steve K

Tags: NI Hardware

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