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Entry  Tue Apr 23 18:48:25 2019, Jon, Update, SUS, c1susaux bench testing completed 
    Reply  Wed Apr 24 17:07:39 2019, gautam, Update, SUS, c1susaux in-situ testing [and future of IFOtest] 2019-04-24_20-29.pdfScreenshot_from_2019-04-24_20-05-54.pngSRM_OSEMPD_WHT_ACROMAG.pdfDCVmon.png
Message ID: 14563     Entry time: Tue Apr 23 18:48:25 2019     Reply to this: 14567
Author: Jon 
Type: Update 
Category: SUS 
Subject: c1susaux bench testing completed 

Today I tested the remaining Acromag channels and retested the non-functioning channels found yesterday, which Chub repaired this morning. We're still not quite ready for an in situ test. Here are the issues that remain.

Analog Input Channels

Channel Issue
C1:SUS-MC2_URPDMon No response
C1:SUS-MC2_LRPDMon No response

I further diagnosed these channels by connecting a calibrated DC voltage source directly to the ADC terminals. The EPICS channels do sense this voltage, so the problem is isolated to the wiring between the ADC and DB37 feedthrough.

Analog Output Channels

Channel Issue
C1:SUS-ITMX_ULBiasAdj No output signal
C1:SUS-ITMX_LLBiasAdj No output signal
C1:SUS-ITMX_URBiasAdj No output signal
C1:SUS-ITMX_LRBiasAdj No output signal
C1:SUS-ITMY_ULBiasAdj No output signal
C1:SUS-ITMY_LLBiasAdj No output signal
C1:SUS-ITMY_URBiasAdj No output signal
C1:SUS-ITMY_LRBiasAdj No output signal
C1:SUS-MC1_ULBiasAdj No output signal
C1:SUS-MC1_LLBiasAdj No output signal
C1:SUS-MC1_URBiasAdj No output signal
C1:SUS-MC1_LRBiasAdj No output signal

To further diagnose these channels, I connected a voltmeter directly to the DAC terminals and toggled each channel output. The DACs are outputting the correct voltage, so these problems are also isolated to the wiring between DAC and feedthrough.

In testing the DC bias channels, I did not check the sign of the output signal, but only that the output had the correct magnitude. As a result my bench test is insensitive to situations where either two degrees of freedom are crossed or there is a polarity reversal. However, my susPython scripting tests for exactly this, fetching and applying all the relevant signal gains between pitch/yaw input and coil bias output. It would be very time consuming to propagate all these gains by hand, so I've elected to wait for the automated in situ test.

Digital Output Channels

yes Everything works.

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