Amprobe BDM40-UA Bench-Digital-Multimeter - Manual (Page 17)

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1. With the test leads held apart, select the 2000 k Ω range. The LED should display an over range
indication (all digits are flashing).
2. Make a firm connection between the probe tips of the test leads. The LED should count down to 000.0.
3. Maintain a firm contact between the probe tips and sequentially select all ranges starting with the
200
Ω range. The decimal point for each should be as follows:
Range Display
200 Ω
2 k Ω
20 k Ω
200 k Ω
2000 k Ω
20 M Ω
199.99*
1.9999*
19.999
199.99
1999.9
19.999
*Display value will show lead resistance.
Automatic test lead compensation
When measuring low resistances, test lead resistance interferes with low resistance readings and usually has to
be subtracted from resistance measurements for accuracy.
DIODE MEASUREMENT
The five resistance ranges bar with a diode symbol beside the range value have a high enough measurement
voltage to turn on a silicon junction. These ranges can be used to check silicon diodes and transistors. The 2k
Ω
range is preferred. It is marked with the largest diode symbol.
CALIBRATION
WX WARNING
THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY. TO
AVOID ELECTRICAL SHOCK, DO NOT PERFORM ANY SERVICING OTHER THAN THAT
CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO
SO.
Introduction
This section contains the maintenance information for this Digital Multimeter. This information is divided into
service information, general maintenance, a group of performance tests, a calibration adjustment procedure, and
troubleshooting. The performance tests are recommended as an acceptance check when the instrument is first
received and should be completed as necessary to verify that your DMM is operating within the specification
limits listed in SPECIFICATIONS Section. A calibration cycle of 1- year is recommended to maintain the
specifications given in SPECIFICATIONS Section of this manual. The test equipment required for both the
performance test and the calibration adjustment procedure is listed in Table 3. If the recommended test
equipment is not available, instruments having equivalent specifications may be used.
Service Information
This DMM is warranted for a period of 1-year upon delivery to the original purchaser. Conditions of the warranty
are given on the first page of this manual and Service instructions are in the Maintenance Section.