Frequency Measurement; Resistance Measurement - VOLTCRAFT VC281 TRMS Bedienungsanleitung

j) Frequency measurement
The DMM can be used to measure the frequency of a signal volt-
age (supports frequencies from 10 Hz to 10 MHz). The maximum
input is 30 Vrms. This mode is not suitable for taking measure-
ments on mains voltages. Observe the input specifications in the
technical data.
Proceed as follows to measure frequency:
- Switch the DMM on and select "Hz" mode. "Hz" will appear on
the display.
- Insert the red test lead into the Hz measurement socket (G)
and the black test lead into the COM measurement socket (H).
- Connect the two measuring probes to the object that you want
to measure (e.g. signal generator or circuit).
- The frequency and corresponding unit will be displayed.
- After taking a measurement, remove the leads from the meas-
ured object and switch the DMM off.
k) Resistance measurement
Ensure that all objects that you want to measure (including circuit components, circuits and com-
ponent parts) are disconnected and discharged.
Proceed as follows to measure the resistance:
- Switch the DMM on and select the "Ω" measurement mode.
- I nsert the red test lead into the Ω measurement socket (G) and
the black test lead into the COM measurement socket (H).
- Check the test leads for continuity by connecting both measur-
ing probes to one another. The multimeter should then show a
resistance value of approx 0 - 0.5 Ω (inherent resistance of the
test leads).
- F or low-impedance measurements of <600 Ω, hold down
the "REL" button (C) for approximately one second when the
measuring probes are short circuited. This ensures that the
inherent resistance of the test leads does not affect the resist-
ance measurement. The display should show 0 Ω. Auto range
is thereby disabled.
- Connect the measuring probes to the object that you want to
measure. The measurement will be indicated on the display
(provided that the object you are measuring is not highly re-
sistive or disconnected). Wait until the display stabilises. This
may take a few seconds for resistances greater than 1 MΩ.
- "OL" (overload) indicates that the measurement range has
been exceeded or that the circuit is broken.
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