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HV
High Voltage Test (SB)
The HV command invokes a test used to determine the optimum high voltage setting for the photomultiplier. Once the instrument is properly setup (see Appendix F - jumper J2 on the high voltage module must be moved from Pins 2-3 to Pins 1-2 after the Brewer power is turned off, then the power returned to perform the test. After the test is performed the brewer power must again be turned off and the jumper J2 on the high voltage module must be returned from Pins 1-2 back to Pins 2-3, and then the power restored for normal operation). The HV command starts an automatic high voltage test and writes the results to HVJJJYY.III.
| Operating Position | HV Test Position |
|---|---|
 |  |
The HVSET command can then be used to set the High Voltage. Alternately, after the instrument is returned to normal operation, an adjustment can be made while monitoring the high voltage during multiple AP tests.
This test is normally used in the factory during the final set-up stages of manufacture, or in the field if it is suspected that the setting is not correct. The Standard Lamp is turned on, the iris is opened, FW#1 is put to position 1, and FW#2 is set to position 0.
See the HVSET command, and Appendix F for more details on the HV test.
To run a manual high voltage test for multiboard (old electronics) use HVB.
Suggested Values
| Description | Suggested values | |
|---|---|---|
| Photomultiplier serial Number: | Enter the brewer serial number | IE: 046 |
| Preame Voltage level | Enter the discriminator (PMT) voltage | 52mm PMT are typically around -30mV, where as 22mm PMT are usually around -10mV |
| Min Voltage | Where to start measuring the high voltage test from | For MB, usually around -900~-1000v |
| Max Voltage | Where to end the high voltage test at | For MV, usually around -1700 |
| Increment | Increment per level | For MB, 50, for SB, 25 |
| High Voltage(V) | Measured Voltage(V) |
|---|---|
| 900 | -4.5 |
| 950 | -4.75 |
| 1000 | -5.00 |
| 1050 | -5.20 |
| 1100 | -5.50 |
| 1150 | -5.75 |
| 1200 | -6.00 |
| 1250 | -6.25 |
| 1300 | -6.50 |
| 1350 | -6.75 |
| 1400 | -7.00 |
| 1450 | -7.25 |
| 1500 | -7.50 |
| 1550 | -7.75 |
| 1600 | -8.00 |
| 1650 | -8.25 |
| 1700 | -8.50 |
| 1750 | -8.75 |
| 1800 | -9.00 |