AMS Geneva Memo

Procedure for hybrids check when received from SELMIC

When a pair of hybrids is received from SELMIC the following procedure has to be followed.

1. Read the documents, if any.
2. Visual inspection:
1. Verify the quality of the bondings.
2. Verify the position of the extra ceramic piece.
3. Verify the position of the capacitor chips.
4. Verify passive components.

- Write OK or BAD in the appropiate box of the data sheet.


3. Electrical test #1:
1. Connect the hybrids to the PC card.
2. Run the program SCOPE and then switch on the power with the red button (NO BIAS). If any pathology shows up (typically one or more chips without any variation in the pedestal), switch off the power and call an expert (!).
3. Identify the temperature sensor (command Y) on the K hybrid.

- Write the results in the appropiate box of the data sheet.


4. Electrical test #2:
1. Run the program CALIB specifying the output file name as h?psxxyy

   h = Hybrid (default)
   

   ? = Side (b: both hybrids, k: K-side, s: S-side)
   

   p = PCB version of the hybrid (default)
   

   s = hybrid just arrved from SELMIC

   xx = pair (or hybrid) ID number as in SELMIC
   

   yy = calibration progressive number (in principle just 01 ...)
   

   Write the filename in the appropiate box of the data sheet
   

2. Verify the output on the screen:

   - All the chips should have zero underflow.
   

   - The mean sigma should be below two for only hybrid and below four for hybrid with a biased detector.
   

   - The mean gain should be between 10 and 25 (for sure NOT zero and NOT negative).

   - The number of dead strip should be zero.
   

   - The number of bad strip should be below 5.
   

5. Every time you use the hybrid connector, write it on the data sheet.
6. Use PAW and the kumac SHOWCAL to verify the quality of the calibration data.
7. Login on schp5.unige.ch with anonymous ftp and put the .cal and .tab files in the directory pub/ams/finland
8. A physicist takes the decision if the hybrid is suitable to be used. G. Ambrosi gives to the ibrid the AMS ID number (up to date information are available at http://www.pg.infn.it/ams/private/tfe/procsched.htm).