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40m Log |
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Tue Jul 16 16:00:01 2019, gautam, Update, CDS, c1iscaux Supermicro setup
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Wed Jul 17 21:22:41 2019, gautam, Update, CDS, CM board Latch Enable subtlety
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Sun Jul 21 12:55:38 2019, gautam, Update, CDS, CM board Latch Enable test script 
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Fri Aug 9 08:59:04 2019, gautam, Update, CDS, Prep for install of c1iscaux
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Sun Aug 11 11:47:42 2019, gautam, Update, CDS, Bench test of c1iscaux
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Mon Aug 12 17:36:04 2019, gautam, Update, CDS, More bench test of c1iscaux
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Mon Aug 12 21:25:19 2019, Koji, Update, CDS, More bench test of c1iscaux
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Tue Aug 13 08:07:09 2019, gautam, Update, CDS, P1--->P2
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Tue Aug 13 14:36:17 2019, gautam, Update, CDS, P1--->P2
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Fri Aug 16 16:40:04 2019, gautam, Update, CDS, 1Y3 work  
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Sat Aug 17 16:49:23 2019, gautam, Update, CDS, More 1Y3 work   
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Mon Aug 19 14:36:21 2019, gautam, Update, CDS, c1iscaux remaining work
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Tue Aug 20 19:05:24 2019, Koji, Update, CDS, MC1 (and MC3) troubleshoot 
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Thu Aug 22 12:54:06 2019, Koji, Update, CDS, MC1 glitch removed (for now) and IMC locking recovered 7x
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Thu Aug 22 20:56:51 2019, Koji, Update, CDS, MC1 glitch removed (for now) and IMC locking recovered
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Fri Aug 23 18:46:17 2019, Jon, Update, CDS, c1iscaux remaining work
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Sun Aug 25 14:18:08 2019, gautam, Update, CDS, c1iscaux remaining work
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Thu Jul 18 10:46:04 2019, gautam, Update, CDS, Database files made
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Thu Jul 18 19:58:56 2019, gautam, Update, CDS, Work on Acromag chassis  
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Fri Jul 19 19:44:03 2019, gautam, Update, CDS, Database file test
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Message ID: 14840
Entry time: Sun Aug 11 11:47:42 2019
In reply to: 14837
Reply to this: 14841
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Author: |
gautam |
Type: |
Update |
Category: |
CDS |
Subject: |
Bench test of c1iscaux |
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I bench tested the functionality of all the c1iscaux Acromag crate channels. Summary: we are not ready for a Monday install, much debugging remains.
- DAC channels were tested using 4 ch oscilloscope and stepping the whitening gain sliders through their 15 gain settings
- Response was satisfactory - the output changes between 0 - 5 V DC in 15 steps.
- This analog voltage is converted to binary representation by an on-board ADC on the whitening boards. So we may have to tune the offset voltage and range to avoid accidental bit flipping due to the analog voltage of a particualr step falling close to the bit-flipping edge of the on-board ADC. This will require an in-situ test.
- Test passed
- BIO output channels were tested using a DMM, and monitoring the resistance between the BIO pin and the RTN pin. In the "ON" state, the expected resistance is ~5 Mohm, and in the off state, it is ~3 ohms.
- The AA filter switches on BIO1 unit do not show the expected behavior - @ Chub, please check the wiring.
- All others (except the mbboDirect bits, see next bullet) were okay, including those for the CM board that are NOT part of the mbboDirect groups.
- Test failed
- ADC channels were tested by driving a ~2Vpp 300mHz sine wave with a function generator, and looking at the corresponding EPICS channel with StripTool.
- I found that all the ADC channels don't function as expected.
- Part of the problem is due to incorrect formatting of the EPICS records in the db files, but I think the ADCs also need to be calibrated with the precision voltage source.
- Why only ADCs require calibration and not the DACs????
- Test failed
- mbboDirect BIO output test - I made a little LED breadboard tester kit to simultaneously monitor the status of these groups of binary outputs.
- The LSB is toggled as expected when moving the gain slider along.
- However, the other bits in the group are not toggled correctly.
- I believe this is a problem with either (i) the way the EPICS record is configured to address the bits or (ii) the incorrect modbus datatype is used to initialize the ioc.
- It will be helpful if someone can look into this and get the mbboDirect bits working, I don't really want to spend more time on this.
- Test failed
I am leaving the crate powered (by bench supplies) in the office area so I have the option to work remotely on this. |