Velleman DVM52IT Handbuch Seite 5

6.4. Manual Operation and Using the Test Button
When measuring insulation, you can rotate the function switch to the "MANU." position. The meter is now operated
manually. The measurement begins when you press the test button. For prolonged measurements it can be very
practical to lock the test button : just press the button and turn it anticlockwise. You can place the function switch in
the LOCK 1min., LOCK 2min. or LOCK 4min. position to perform measurements of the indicated duration. Simply
place the function switch in the MANU. position again if you want to interrupt your measurements before the 1, 2 or 4
minutes are up.
6.5. Preparing for Measurements
When the symbol is printed beside on of the jacks, this means that the indicated limit values must be respected in
order to protect the inner circuits from damage.
The low-battery sign
voltage drops below 7V.
6.6. Measuring Insulation Resistance
Insulation tests should only be conducted on deactivated circuits. Connect the DVM52IT and the
circuit in question with test leads and press the test button to execute the test.
1. Select the required test mode (MANU., LOCK 1min., LOCK 2min., LOCK 4min.) with the function switch.
2. Select the required range (200MΩ/250V, 200MΩ/500V, 2000MΩ/1000V) with the range selector.
3. Connect the black test lead with the LOW jack and the red test lead with the HIGH jack.
4. Connect the test leads with the circuit to be tested.
5. Press the test button. In the manual mode, you can press and then rotate the test button anticlockwise to lock it.
6. Read the measured value from the LCD.
Never touch the circuit under test during your measurements. Do not rotate the range switch while
the test button is in the depressed position.
When your measurements are completed you must release the test button before the test leads are
disconnected. This is because the system is charged up and must be allowed to discharge through
the tester's internal discharge resistor.
6.7. Measuring AC Voltage
1. Connect the black test lead with the LOW jack and the red test lead with the HIGH jack.
2. Put the function switch in the 200Ω
3. Put the range switch in the 700V~position.
4. Connect the test leads with the source or load to be tested.
5. Read the measured value form the LCD.
The symbol indicates that the limit values of 700V rms AC and 1000V DC have to be respected. It may be
possible to measure higher voltages, but this may destroy the inner circuit. Be careful to avoid electroshocks when
performing measurements.
DVM52IT
indicates that the batteries should be replaced. This symbol is displayed when the battery
, 700V~ or 1000V position.
5 VELLEMAN