Fluke Biomedical 35035 - Manual (Page 13)

Maintenance
General
4
4-1
Section 4
Maintenance
4.1 General
The Inovision Model 35035 mA/mAs Meter is designed to perform with an accuracy of 1%. The
performance of the meter should be checked periodically to ensure accurate, reliable operation. Under
normal operating conditions, this instrument will perform to specifications for a period of at least one (1)
year after calibration. The calibration cycle is, therefore, one (1) year. Any major, abrupt changes in
performance indicate that the meter might not be operating properly. The unit should then be returned to
the factory for calibration and repair. There are no user-serviceable parts within the meter. See Section
4.8 for calibration and repair information.
The calibration procedure for a normal operating unit does not require any disassembly of the instrument.
Adjustments are all accessible from the enclosure exterior. They are set using a small flat-blade
screwdriver with an insulated handle or an adjustment tool specifically designed for trimmer potentiometer
adjustment purposes. Refer to Figure 2-2 for the exact location of the trimmer potentiometer access
holes.
4.2 Cleaning the Instrument
To clean the exterior of the instrument, follow these steps:
1. Turn off the instrument and disconnect all input connectors.
2. Moisten a soft cleaning cloth with a solution of three parts water and one part liquid dishwashing
detergent.
Do not soak the cloth in the solution; you must not let the solution drip inside the instrument.
3. Use the moistened cloth to wipe the instrument's exterior cover.
4. Let the instrument dry completely before using.
4.3 Test Equipment
A calibrated DC current source is required to properly calibrate the Model 35035 mA/mAs Meter. Its dwell
time should be adjustable from 100 mS to 10 s and accurate to within 0.5%. Its current output should be
adjustable from 1 mA to 2 A and accurate to within 0.5%. Finally, its compliance (burden) voltage should
be adjustable to 25 volts DC.
In addition, a precision digital multimeter (0.25% accuracy in DC Amps) can be in the circuit to monitor the
output of the current source.
4.4 Performance Tests
Connect the Model 35035 to the current source with appropriate test leads. Place its mode switch in the
DC position. For the mA performance tests, apply the current listed and verify that the Model 35035
display reads within the limits specified. For the mAs performance tests, apply the current for the dwell