E.) Impedance Measuring - VOLTCRAFT VC880 Notice D'emploi

d) Frequency Measuring/Signal Ratio in % (Duty Cycle)
The DMM can be used to measure and indicate signal voltage frequencies from 0.001 Hz to 400 MHz.
Proceed as follows to measure frequencies:
- Switch on the DMM and select measuring range "mV
Press the "SHIFT/SETUP" button repeatedly until the display
indicates "Hz".
- Plug the red measuring line into the Hz measuring jack (7) and
the black measuring line into the COM measuring jack (8).
- Connect the two measuring prods to the object to be measured
(signal generator, circuit, etc.).
- The frequency and corresponding unit are displayed.
- Press the "SHIFT/SETUP" button again until the display indi-
cates "%" to measure the signal ratio (duty cycle).
- After measuring, remove the measuring lines from the measured
object and turn off the DMM.
e) Impedance Measuring
Make sure that all the circuit parts, switches and components and other objects of measurement
are disconnected from the voltage and discharged.
Proceed as follows to measure impedance:
- Switch on the DMM and select measuring range "Ω ".
- Plug the red measuring line into the Ω measuring jack (7) and
the black measuring line into the COM measuring jack (8).
- Check the measuring lines for continuity by connecting both measuring
prods with one another. The impedance value must be approximately
0 - 1.5 Ohm (inherent impedance of the measuring lines).
- For low-impedance measurements, press the button "REL/PC"
(10) to not include the inherent impedance of the measuring lines
in the following impedance measurement. The display shows the
delta symbol and 0 Ohm are indicated. The automatic range
selection (AUTO) is deactivated. The basic value (rel difference)
is displayed in the upper, small display.
- Now connect the two measuring prods to the object to be mea-
sured. As long as the object to be measured is not high-imped-
ance or interrupted, the measured value will be indicated on the
display. Wait until the displayed value has stabilised. With
impedances of >1 MOhm, this may take a few seconds.
- If "OL" (overload) appears on the display, you have exceeded the measuring range or the measuring circuit is inter-
rupted. Pressing the "REL" button again switches off the relative function and activates the autorange function.
- After measuring, remove the measuring lines from the measured object and turn off the DMM.
46
Hz %".