Relay for Powering the RF stage of a Low Noise VCO

Document #:

LIGO-D1900056-v1

Document type:

D - Drawings

Abstract:

Remote controlled relay for power to RF stages in low noise VCO.

Files in Document:

• D1900056-v1.pdf (88.7 kB)

Other Files:

• D1900056-v1-assembly.zip (104.7 kB)
• D1900056-v1.zip (2.2 MB)
• VCORelayMounting.jpg (495.6 kB)

ICS/JIRA Record:

• d1900056

Topics:

• Sensing and Control

Authors:

• Daniel Sigg

Keywords:

ISC Low Noise VCO

Notes and Changes:

Mounting:
- Add standoffs as shown in above pic.
- Use 3 female-female and 1 male-female standoffs.
- F/f standoffs require #6-5/16 screws through mounting plate.
- M/f standoff uses chassis insert.
- Mount PCB as shown in above pic using 4 #6-3/16 screws.
- Connect flat-ribbon cables as shown.
- VCO relay board in between rear board and VCO source.

How to test:
- Use the VCO test rig D1100545.
- The excitation enable switch in principle will toggle the relay.
- However, a pull-up resistor of 1K needs to be added first between the open pin of the EXCEN_S switch and VCC (e.g., VCC pin of close-by LED)
- Turn both front panel power switches on (the two to the right).
- Toggle the relay and make sure the LEDs turn off.
- Check the readback by probing the voltage between pins 12/25 on the read DB25.
- It should be -6V for the most right switch, and -3V for the middle switch, and all combinations.

Referenced by:

• LIGO-E1200120: aLIGO, ISC, RF System, Low Noise VCO