Frequency Measurement; Ncv (Non-Contact Voltage) Detection; Line (Live Wire Recognition) Test - Velleman DVM040 User Manual

Notes
• The test may take more time for large capacitors to charge, wait until
the readings settle before ending the test.
• To improve the accuracy of measurement less than 10nF, subtract the
residual capacitance of the meter and test leads.

10.7 FREQUENCY MEASUREMENT

To avoid electric shock, do not apply more than 250V DC or 250V
AC rms before taking frequency measurement.
1. Set the rotary switch to desired frequency (Hz) range.
2. Insert the black test lead banana plug into the negative COM jack and
the red test lead banana plug into the positive (Hz) jack.
3. Touch the test lead tips to the circuit under test.
4. Read the frequency value in the LCD display.

10.8 NCV (NON-CONTACT VOLTAGE) DETECTION

Due to external interference source, this function may cause wrong
voltage detection, the detection result is for reference only.
1. Remove the test leads and set the rotary switch to NCV position and
LCD display EF, contact the top part of meter with the circuit under
test, the indicating LED will flash and audible signal will sound, the
signal strength showed in LCD display.
Notes
• The detection result is for reference, do not determine the voltage by
NCV detection ONLY.
• Detection may interfere by socket design, insulation thickness and
other variable conditions.
• The external interference sources, such as flashlight, motor, etc, may
cause the wrong detection.

10.9 LINE (LIVE WIRE RECOGNITION) TEST

1. Set the rotary switch to NCV position, connect the red test lead to
"°C/°F V
the buzzer of meter will be activated and red LED will be flickered,
V. 01 – 04/05/2023
DVM040
Hz % mF" jack. Contact the red test lead to live wire,
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