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A Basic Operability Test
To check the basic operability, do the following:
1. Turn the rotary switch to
A
and plug a test lead into
A
input terminal, display is of
functional graphics if the fuse is good.
2. Then test the
mA
input fuse (1A) by inserting a test lead into
mA
input terminal and
turn the rotary switch to
mA
. (
A
input must be open).
The display is of normal functional graphics if the fuse is good.
If the Meter fails to operate properly:
• Check the battery and fuses and replace as needed.
• Verify that you are operating the Meter correctly by reviewing the operating instructions
found in the
Users Manual.
To complete a comprehensive performance test and verify the accuracy of each Meter function and
operation, perform the remainder of the tests under “Performance Tests”.
Testing the Display
Press
Bar
key and turn the meter on from the
OFF
position to hold the Meter in Display Test Mode.
Compare the display with the appropriate example in Figure 2. Turn off the meter to escape the test mode.
LCD Display of the 61-490 Series
Testing the Voltage Function
To verify accuracy in the
AC
and
DC
voltage ranges, do the following:
1. Connect the Calibrator to the
V
Ω
and
COM
inputs on the Meter.
2. Set the Calibrator for the voltage and frequency from step 1 to 19 in Table 1.
3. Compare the reading on the Meter display with the display reading shown in Table 1.
4. If the display reading falls outside of the range shown in Table 1, the Meter does not
meet specification.
Form number TM61494-5
Rev 2 February 2002