Multimetrix DMM 230 Notice De Fonctionnement page 30

4.
Apply test probes to the terminals of diode to be tested. Direct voltage
is usually expressed by a
voltage is indicated by "OL". Short-circuit elements display a
value close to 0V, open elements "OL" in both polarities.
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 test probes to the points of the
circuit to be tested.
5. The frequency measured is displayed on
screen.
6. Press the Hz% key again to display "%" on
screen.
7. Duty cycle is displayed in percentage.
3.11 Autoranging/Manual selection
When the multimeter is first turned on, it automatically goes into
Auto-ranging 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 selected.
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 Frequency measurements.
3.12 MAX/MIN
 When using the MAX/MIN function in Autoranging mode, the
multimeter will "lock" into the range that is displayed on the LCD
when MAX/MIN is activated. If a MAX/Min reading exceeds that
range, "OL" will be displayed. Select the adequate range before
entering MAX/MIN mode.
28
value between 0.4 and 0.7 V. Reverse
Chapter II
DMM230