Frequency Measurement - Velleman DVM13MFC2 Manual Del Usuario

RESET key
Press this key to reset your DVM13MFC2.
ATT key
Place this button in the down position for a measurement attenuated by 20 dB. Place this button in the
up position for a non-attenuated measurement.
4. Operation
Make sure to match the voltage from the local mains with the voltage on your
DVM13MFC2. Check the 220V/110V switch at the back of the device.
Connect the power cord to a power outlet (AC 220 V/110 V, 50 Hz or 60 Hz) and switch on your
DVM13MFC2. Allow the unit to warm up for 20 minutes.

Frequency Measurement

1. Select channel A or channel B (depending on the range being measured) and connect it to the signal
source by means of a suitable test cable (not included).
2. Press the AC/DC COUPLING key if the frequency of the signal to be measured is less than 100 Hz.
3. If the input signal is high, press the ATT key to ensure that the DVM13MFC2 will measure an
attenuated signal.
4. When you press the FUNCTION key, the last digit display shows the currently selected step.
The frequency measurement has only 3 steps.
5. Complete steps 1 to 3 and press the CONFIRM key. The DVM13MFC2 displays the measurement
results.
6. Adjust the gate time.
7. When measuring a 100 Hz signal, the device automatically starts measuring the period and displays
the measuring results.
Period Measurement
Press the PERIOD key. The device starts measuring the period and displays the test results.
5. Examples
1. Connect the DVM13MFC2 to the mains (110/220 VAC).
2. Switch on the device using the ON button and preheat it for 20 minutes.
3. Connect a suitable test cable (not incl.) with the input port on the front panel. Select channel A or B
according to the frequency range.
4. Select the proper function and gate time. The shorter the gate time, the faster the frequency
measurement but the lower the resolution. The longer the gate time, the slower the frequency
measurement but the higher the resolution.
5. Press PERIOD to measure the period. Press the CONFIRM key to confirm. The device starts
measuring.
Example 1: Measuring an analogue handset
Connect a suitable test cable (not incl.) with the input from channel B and set the FUNCTION key to the
1-step position. Select the gate time (adjust manually from 100 ms to 10 s). The LED display reads:
V. 03 – 05/12/2017
DVM13MFC2
1-step
900 MHz
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