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Velleman DVM9912 Manual

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DVM9912 VELLEMAN
5
NOTE: In some low AC and DC voltage ranges, with the test leads not connected to a device, the display may
show a random, changing reading. This is normal and is caused by the high input sensitivity. The
reading will stabilise and give a proper measurement when connected to a circuit.
MODE BUTTON
To select Diode/Continuity, DC/AC, Hz/%Duty
RANGE BUTTON
When the meter is turned on for the first time, it automatically goes into Autoranging mode. This mode
automatically selects the best range for the measurements and is generally the best mode for most
measurements. For measurements situations that require a manually selected range, perform the following
actions:
1. Press the RANGE button. The “AUTO” indication on the display will disappear.
2. Press the RANGE button to go through the available ranges and you select the range you want.
3. Press and hold the RANGE button for 2 seconds to exit the ManualRanging mode and return to
AutoRanging.
DATA HOLD BUTTON
The data hold function allows the meter to “freeze” a measurement for later reference.
1. Press the DATA HOLD button to freeze the reading on the display. The indicator “HOLD” will appear on the
display.
2. Press DATA HOLD again to return to normal operation.
RELATIVE BUTTON
The relative measurement feature allows you to make measurements relative to a stored reference value. A
reference voltage, current, etc. can be stored and measurements made in comparison to that value. The
displayed value is the difference between the reference value and the measured value.
1. Perform any measurement as described in the operating instructions.
2. Press the RELATIVE button to store the reading in the display and the “REL” indicator will appear on the
display.
3. The display will now indicate the difference between the stored value and the measured value.
4. Press the RELATIVE button to return to normal operation.
7. Measurements
DC VOLTAGE MEASUREMENTS
CAUTION:
Do
not measure DC voltages if a motor on the circuit is being switched ON or OFF. Large
voltage surges may occur that can damage the meter.
… 5 …


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