6. Diode Measurement (See Figure 8)
1) Insert the red test lead into the “Ω” input jack
and the black test lead into the “COM” input
jack. The polarity of the red and black test lead
is “+” and “-’, respectively.
2) Rotate the function dial to the ” “ measure-
ment mode. Press SELECT to select the diode
measurement ” “. Read the approximate
forward bias voltage drop accross the PN
junction. For silicon PN junction diodes, the
voltage drop is typically 500~800mV.
Note:
• ”OL” will be displayed when the measured diode
is open-circuited or the polarity of the diode is
inverted (reverse biased).
• Before measuring diodes, the power to the
circuits should be turned off and all capacitors
should be discharged to ensure measurement
accuracy.
• The open circuit test voltage for the diode
measurement is approximately 3.5V.
• Do not input voltages higher than 30VDC or
30VAC or personal injury may result.
• After completing all measurement operations,
disconnect the test leads from the measured
circuit.
7. Capacitance Measurement (See Figure 9)
1) Insert the red test lead into the “ ” input jack
and the black test lead into the “COM” input
jack. Capacitance should be measured using
the REL function mode.
2) Rotate the function dial to the ” “ measure-
ment mode to select capacitance. Connect the
test leads in parallel with the two terminals of the
capacitor.
3) Read the measured capacitance from the
display. Use the shortest test leads possible to
reduce the impact caused by distributed
capacitance.
GCM-407 User Manual
8
GCM-407 User Manual
21
22
Summary of Contents for GCM-407
Page 1: ......
