METREL MD 9880
DMM Setup and Measurements
11
test lead banana plug into the positive V jack.
Read the Frequency in the display.
Press the MODE key to switch the Duty cycle
functions.
Read the Duty cycle in the display.
Resistance Measurements
WARNING:
To avoid electric shock, disconnect power to the unit
under test and discharge all capacitors before taking any
resistance measurements. Remove the batteries and
unplug the line cords.
Set the rotary function switch to the
position.
Insert the black test lead banana plug into the
negative COM jack. Insert the red test lead banana plug into the positive
Ω Jack.
Read the resistance in the display
Continuity Check
WARNING:
To avoid electric shock, disconnect power to the unit under test and discharge all
capacitors before taking any resistance measurements. Remove the batteries and
unplug the line cords.
Set the rotary function switch to the
position.
Insert the black test lead banana plug into the negative COM jack. Insert the red
test lead banana plug into the positive V jack.
Press the MODE key to switch to the continuity function.
If the resistance is less than approximately 50
Ω, the audible signal will sound. If
the circuit is open, the display will indicate
“O.L”.
Diode Test
Set the rotary function switch to the
position.
Insert the black test lead banana plug into the negative COM jack and the red test
lead banana plug into the positive V jack.
Press the MODE key to switch to the Diode function.
For ward voltage will typically indicate 0.400 to 3.000V
Reverse voltage will indicate "O.
L”. Shorted devices will indicate near 0 V and an
open device will
indicate "OL” in both polarities.
Capacitance Measurements
WARNING:
To avoid electric shock, disconnect power to the unit under test and discharge all
capacitors before taking any capacitance measurements. Remove the batteries and
unplug the line cords.
Figure 3: Measuring frequency
