Teledyne 9110AH Instruction Manual page 177

TELEDYNE Model 9110AH NO Analyzer Operator Manual, 01620, Rev. F
X
9.3.8.5 High Voltage P.S.
The HVPS is located in the interior of the Sensor Module, and is plugged into the PMT tube. It
requires 2 voltage inputs. The first is +15 VDC, which powers the supply. The second is the
programming voltage, which is generated on the Preamp Board. This power supply is unlike a
traditional PMT HVPS. It is like having 10 independent power supplies, one to each pin of the
PMT. The test procedure below allows you to test each supply.
Adjustment of the HVPS is covered in the Factory Calibration Procedure in Section 9.1.6.
To troubleshoot the HVPS:
1. Turn off the instrument.
2. Remove the cover and disconnect the 2 connectors at the front of the NO Sensor Module.
x
3. Remove the end cap from the sensor.
4. Remove the HVPS/PMT assembly from the cold block inside the sensor. Un-plug the PMT
tube.
5. Re-connect the 7 pin connector to the Sensor end cap, and power-up the instrument.
6. Use Figure 9-12 to check the voltages at each pin of the supply.
7. Turn off the instrument power, and re-connect the PMT tube, then re-assemble the sensor.
If any faults are found in the test, you must obtain a new HVPS as there are no user serviceable
parts inside the supply.
9-61