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

Potentiometer	Adjustment (943-227-15)	Tolerance
R11	Programmable Gain Amplifier Offset Adjustment	± 2 mV
R12	Auto Zero Set-Up Adjustment	± 10 mV

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.

Document	Description
TP943-227-15VL	Test Procedure, Victoreen Loop Communications
TP943-227-15	Test Procedure, RS232 communications
TP977-200-15M	Electrometer PCB Test Procedure

4-1

943-227-15, 943-27 specifications

The Fluke 943-27 and Fluke 943-227-15 are advanced electrical testing tools designed to meet the demands of professionals in industrial and commercial settings. Recognized for their accuracy and reliability, these devices come loaded with essential features tailored to ensure optimal performance during electrical measurements.

The Fluke 943-27 is a compact yet powerful multimeter that excels in providing precise voltage and current readings. It is equipped with a large, backlit display that ensures visibility in low-light environments. The device supports a wide range of testing parameters, including AC and DC voltage, resistance, continuity, and capacitance measurements, making it invaluable for troubleshooting electrical circuits.

On the other hand, the Fluke 943-227-15 offers additional capabilities, including advanced data logging features. This multimeter allows users to record and analyze measurements over time, which is particularly useful for identifying intermittent issues in electrical systems. Its connectivity options enable seamless data transfer to a computer or mobile device, facilitating easy documentation and reporting.

Both models illustrate a robust construction built to endure tough working conditions. They meet stringent safety standards, which is critical for protecting users from electrical hazards. The ergonomic design ensures comfort during prolonged use, and features like overmolding enhance grip and durability.

One of the standout technologies in these multimeters is Fluke’s True-RMS measurement capability. This feature ensures accurate readings of non-linear loads, which are common in modern electrical systems with variable frequency drives and other electronic devices. Additionally, the built-in low-pass filter technology reduces noise in measurements, ensuring precision even in environments with significant electrical interference.

The Fluke 943-27 and 943-227-15 are also designed to be user-friendly. They feature intuitive controls and a straightforward user interface, allowing technicians to navigate functions effortlessly. The ability to perform automatic ranging simplifies measurements, eliminating the potential for errors when setting the range manually.

In conclusion, the Fluke 943-27 and 943-227-15 represent essential tools for electrical technicians who require versatility, accuracy, and durability in their testing equipment. With advanced features, reliable technologies, and a user-centric design, these multimeters not only meet but exceed the expectations of professionals in the field.