Duty Cycle/Frequency Measurements (Electronic); - 20Ma Measurements; Autoranging/Manual Range Selection - Multimetrix DMM 240 Notice De Fonctionnement

Chapter II

3.10 Duty cycle/frequency measurements (Electronic)

1. Set the function switch to the "Hz %"
position.
2. Press the Hz/% key to display "Hz" on
screen.
3. Insert the black lead banana plug into the
negative COM terminal and the red test
lead banana plug into the positive +
terminal.
4. Apply the test probes to the points of the
circuit to be tested.
5. Press the Hz% key again to display "%"
on screen.
6. Frequency measured is displayed on
screen.
7. Duty cycle is displayed in percentage.
3.11 % 4 – 20mA measurements
1. Set up and connect as described for DC mA measurements.
2. Set the function switch to the 4-20mA% position.
3. The multimeter will display loop current as a % with 0mA=-25%,
4mA=0%, 20mA=100%, and 24mA=125%.

3.12 Autoranging/Manual range selection

When the multimeter is first turned on, it automatically goes into
Autoranging and this automatically selects the best range for the
measurements being made. This is generally the best mode for most
measurements. For measurement situations requiring manual selection,
proceed as follows:
1. Press the RANGE key. The "AUTO" display indicator will turn off.
2. Press the RANGE key several times to scroll through the available
ranges until the one you want is displayed.
3. To exit the Manual selection mode and return to Autoranging, press
and hold down the RANGE key for 2 seconds.
Manual ranging does not apply to temperature measurements.
DMM240
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