Amprobe 37XR-A Professional-Digital-Multimeter - Manual (Page 12)

5
5. Open the test circuit (() to establish measurement points.
6.
Connect the Test Probes in series with the load.
7.
Turn on power to the circuit being measured.
8.
Read the display, and, if necessary, correct any overload (-) conditions.
Measuring Resistance See Figure -6-
1. Set the Function Switch to :
.
2.
If 5
is displayed, press the yellow button to display
:.
3.
If RANGE is displayed, press the RANGE button to enable autoranging.
4.
Connect the Test Leads: Red to , Black to COM
5. Turn off power to the circuit being measured. Never measure resistance across
a voltage source or on a powered circuit.
6.
Discharge any capacitors that may influence the reading.
7.
Connect the Test Probes across the resistance.
8. Read the display. If - appears on the highest range, the resistance is too large
to be measured.
Testing for Continuity See Figure -7-
1. Set the Function Switch to 5
.
2.
If :
is displayed, press the yellow button to display
5.
3.
Connect the Test Leads: Red to , Black to COM
4.
Turn off power to the circuit being measured.
5. Discharge any capacitors that may influence the reading.
6. Connect the Test Probes across the resistance.
7. Listen for the tone that indicates continuity (< 40 :).
Testing Diodes See Figure -8-
1. Set the Function Switch to *
.
2.
Connect the Test Leads: Red to , Black to COM
3. Turn off power to the circuit being measured.
4. Free at least one end of the diode from the circuit.
5. Connect the Test Probes across the diode.
6.
Read the display. A good diode has a forward voltage drop of about 0.6 V. An
open or reverse biased diode will read -.
Measuring Capacitance See Figure -9-
1.
Set the Function Switch to the function.
2.
If RANGE is displayed, press the RANGE button to enable autoranging.
3. Connect the Test Leads: Red to COM, Black to mA
4. Turn off power to the circuit being measured.
5. Discharge the capacitor using a 100 k: resistor.
6.
Free at least one end of the capacitor from the circuit.
7.
Connect the Test Probes across the capacitor. When measuring an electrolytic
capacitor match the test lead polarity to the polarity of the capacitor.
8. Read the display.