Voltmaster DCM 1 Mode D'emploi page 27

Hz / % button
To switch between Hz and duty cycle measurement.
The duty cycle indicates the relationship between the length of the status when switched on (im-
pulse duration) to the duration of the period (pulse width modulation) for a square wave signal.
The duty cycle is specified as a dimensionless ratio with a value from 0 % to 100 %.
H / ☼ button
Press this button to freeze the value currently displayed.
When pressing and holding (approx. 3 sec.) the button activates and then deactivates the back-
ground illumination. The background illumination switches off automatically after approx. 20 sec-
onds.
Setting to the current range also switches on the lighting at the measurement point.
Measuring transformer tong jaws
Record the current flowing through the conductor.
Observe the "→" mark on the tong jaws to determine the direction of current flow (DC measure-
ment only).
Open the tong jaws, clip them to a conductor and close them correctly. Make sure that there are
no foreign bodies in the connection gap.
Connections
Input: Input for accepting the red test lead for voltage, resistance and continuity measurements.
COM: Input for accepting the black test lead for voltage, resistance and continuity measurements.
Information about the measurement
To obtain the most accurate measurement possible, place the cable as exactly as possible in the
intersection of the markings between the tong jaws.
Accuracy:
 (% of the read-off value + number of digits) at 18° to 28 °C (64° to 74 °F) and rel. humidity
< 75%.
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