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Entry  Thu Feb 18 15:15:12 2021, yehonathan, Update, SUS, OSEM testing for SOSs OSEM_Pin_Plate.png
    Reply  Mon Feb 22 14:06:49 2021, Yehonathan, Update, SUS, OSEM testing for SOSs 
       Reply  Wed Feb 24 10:23:03 2021, Yehonathan, Update, SUS, OSEM testing for SOSs OSEM_078_LED_Spot.JPGOSEM_280_LED_Spot.JPGOSEM_117_LED_Spot.JPG
          Reply  Wed Mar 3 11:51:07 2021, Yehonathan, Update, SUS, OSEM testing for SOSs 
             Reply  Tue Mar 9 14:30:22 2021, Yehonathan, Update, SUS, OSEM testing for SOSs 
                Reply  Tue Mar 9 15:19:03 2021, Koji, Update, SUS, OSEM testing for SOSs 
                   Reply  Tue Mar 9 18:49:28 2021, Yehonathan, Update, SUS, OSEM testing for SOSs 
    Reply  Tue Feb 23 20:55:19 2021, Koji, Update, SUS, OSEM testing for SOSs SOS_OSEM.pdf
       Reply  Wed Feb 24 10:09:16 2021, yehonathan, Update, SUS, OSEM testing for SOSs 
Message ID: 15832     Entry time: Mon Feb 22 14:06:49 2021     In reply to: 15816     Reply to this: 15838
Author: Yehonathan 
Type: Update 
Category: SUS 
Subject: OSEM testing for SOSs 

Continuing with the OSEM testing. I measure the resistance of the wires from the RLC meter to the coil to be ~ 0.9ohm. I will subtract this number from the subsequent coil resistance measurements.

I took the old MC1 satellite box for powering the PD and LED in the OSEM assemblies. I connected an idc breakout board to J4 and powered the box with a DC supply according to the box's schematics.

After getting a bit confused about some voltage reading from one of the PD readouts Gautam came and basically redid the whole rig. Instead of using breakout boards, he powered the amplifier circuit directly from the DC supply. Then, to connect the OSEM pinboard directly to the J1 connector he made a DB25 ribbon cable where the two connectors are opposite to one another to mimic the situation with the vacuum feedthru. He also connected a DB25 to BNCs breakout cable, specific to the satellite box, to the J3 port to read the individual PDs through a BNC connector. We managed to confirm the normal operation of one OSEM (Normal PD voltage and LED light spot hitting the PD using a camera with no IR filter).

It was getting a bit late. Going to start checking the OSEMs tomorrow.

 

 

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