UNISource Corporation DM-1150B Operation Manual page 8

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3.6 Measurement Range
A measurement range determines the measuring limits. The meter has several measurement ranges.
1) Select a proper measurement range:
If the selected measurement range is too small (the testing signal exceeds the measurement range), the

meter will display "OL" on the LCD.
If the selected measurement range is to large, the testing results may have a relatively low resolution.
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2) Auto range and Manual range
The meter has both auto range and manual range for the measurements.
In the AUTO measuring mode, the meter will automatically select a most suitable range for the testing

signal. In AUTO mode, the meter will display "AUTO" on the LCD.
In the MANUAL measuring mode, the measuring range is selected manually by pressing RANGE

button.
If there is more than one range in a measuring function, the meter will default in AUTO range. This
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allows users to override the auto range and lock the meter in a specific range.
In HOLD or MAX/MIN recording mode, changing the measurement range manually will automatically
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exit the HOLD or MAX/MIN mode.
3) Enter or exit mauran range mode
Press RANGE button to select manual range mode. Then, every press on the RANGE button, the meter
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steps to a higher range and will return to the lowest range when the higher range is stepped into.
Pressing RANGE button for at least two seconds can also return to auto range mode.
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4. OPERATION INSTRUCTIONS
4.1 DC Voltage Measurement (DCV)
The measurement of DC voltage has three modes: DCV,
DCV+ACV and dBm.
Set the function key to "

Press SELECT button to select measurement mode.
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According to practical demands, press REL△, MAX/MIN
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and 2nd VIEW buttons to have relative measuring or
record.
Connect the black test lead to "COM" terminal and the read

test lead to "V Ω Hz" terminal.
The meter is in auto range mode and will automatically

select a most suitable range. To select a range manually for
DCV measurement, press RANGE button to select a proper range. There are four ranges to choose from:
8.0000V/80.000V/800.00V/1000.0V
Touch the test leads to the test points and read the display on both the primary and secondary display.
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Press SELECT
DCV
DCV+ACV
dBm
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" position.
Primary display Secondary display
Press 2nd VIEW
DCV
DCV
dBm Hz/ACV/DCV/DCV+ACV
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