Fluke 943-227-15, 943-27 Maintenance, Calibration and Troubleshooting, Electronic Calibration

Maintenance, Calibration and Troubleshooting

Maintenance 4

Section 4

Maintenance, Calibration and Troubleshooting

4.1 Maintenance

The 943-227-15 Digital Preamplifier is designed to operate for extended periods of time with no scheduled maintenance required. Operation may be verified by periodically actuating the check source (provided with the detector and sampling assembly) and observing the response of the unit. If the response varies by more than 50% of the normal value, further troubleshooting may be required. If a problem develops, troubleshoot the unit per Section 4.3 and the drawings in Appendix B.

Whenever the preamplifier enclosure is opened, the condition of the internal desiccant package should be checked. The desiccant bag is provided in the enclosure to absorb moisture. The desiccant bags should be checked for moisture absorption prior to placing into service, or whenever the electronics enclosure cover is opened. Each bag contains a color indicator stripe that turns red when it should be replaced.

4.2 Electronic Calibration

Electronic Adjustments

There are no user adjustments available on the 943-227-15 Digital Preamplifier. The Programmable Gain Amplifier and Auto Zero are factory adjustments, requiring the use of a factory test PROM and test fixture. We strongly recommend the unit be returned to the factory for repair or adjustment.

Table 4-2 lists the electronic adjustments for the 943-227-15 digital preamplifier. The procedures for making these adjustments are contained in the factory Calibration Procedure listed below. Note that special test firmware is required to perform the electrical adjustments.

Table 4-1. Electronic Adjustments

NOTE

Refer to the drawings in Appendix B to locate adjustment and/or test points, if required.

The follow factory calibration and test procedures are listed for reference only.

4-1