Page 29: Cat ii, Min max range hold h hz rel, 4 1/2 digits 1 seconds, True rms multimeter, Figure 6. testing a diode, Typical reading, Forward bias reverse bias
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Making Measurements
21
Testing Diodes
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Caution
The Fluke 117 True RMS DMM is the meter for field service technicians. This True RMS DMM is the solution for a wide variety of electrical and electronic testing applications. Measures ac/dc volts and current, continuity, capacitance, LoZ: Low Input Impeda.
To avoid possible damage to the meter or to
the equipment under test, disconnect circuit
power and discharge all high-voltage
capacitors before testing diodes.
the equipment under test, disconnect circuit
power and discharge all high-voltage
capacitors before testing diodes.
Use the diode test to check diodes, transistors, silicon
controlled rectifiers (SCRs), and other semiconductor
devices. This function tests a semiconductor junction by
sending a current through the junction, then measuring
the junction’s voltage drop. A good silicon junction drops
between 0.5 V and 0.8 V.
controlled rectifiers (SCRs), and other semiconductor
devices. This function tests a semiconductor junction by
sending a current through the junction, then measuring
the junction’s voltage drop. A good silicon junction drops
between 0.5 V and 0.8 V.
To test a diode out of a circuit, set up the meter as shown
in Figure 6. For forward-bias readings on any
semiconductor component, place the red test lead on the
component’s positive terminal and place the black lead
on the component’s negative terminal.
in Figure 6. For forward-bias readings on any
semiconductor component, place the red test lead on the
component’s positive terminal and place the black lead
on the component’s negative terminal.
In a circuit, a good diode should still produce a forward-
bias reading of 0.5 V to 0.8 V; however, the reverse-bias
reading can vary depending on the resistance of other
pathways between the probe tips.
bias reading of 0.5 V to 0.8 V; however, the reverse-bias
reading can vary depending on the resistance of other
pathways between the probe tips.
MIN MAX
RANGE
HOLD
H
Hz
REL
mA
A
mV
V
V
OFF
!
!
A
COM
V
mA
µ
A
1000V MAX
400mA MAX
FUSED
10A MAX
FUSED
PEAK MIN MAX
µ
A
CAT II
+
Typical
Reading
Reading
MIN MAX
RANGE
HOLD
H
Hz
REL
mA
A
mV
V
V
OFF
!
!
A
COM
V
mA
µ
A
1000V MAX
400mA MAX
FUSED
10A MAX
FUSED
PEAK MIN MAX
µ
A
Fluke 111 True Rms Multimeter
CAT II
+
Forward Bias
Reverse Bias
4 1/2 DIGITS
1 Seconds
87
TRUE RMS MULTIMETER
III
4 1/2 DIGITS
1 Seconds
87
TRUE RMS MULTIMETER
III
iy9f.eps
Figure 6. Testing a Diode
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Page 23: Cat ii off (open), True rms multimeter, Figure 3. testing for continuity
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Making Measurements
15
MIN MAX
RANGE
HOLD
H
Hz
REL
mA
A
mV
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V
V
OFF
!
!
1000V MAX
400mA MAX
FUSED
10A MAX
FUSED
PEAK MIN MAX
µ
A
CAT II
Activates
continuity
beeper
continuity
beeper
ON
(closed)
MIN MAX
RANGE
Fluke 26 Iii True Rms Multimeter Manual
HOLD
H
Hz
REL
mA
A
mV
V
V
OFF
!
!
1000V MAX
400mA MAX
FUSED
10A MAX
FUSED
PEAK MIN MAX
4 1/2 DIGITS
1 Seconds
4 1/2 DIGITS
1 Seconds
µ
A
CAT II
OFF
(open)
A
COM V
mA
µ
A
For in-circuit tests, turn circuit power off.
87
TRUE RMS MULTIMETER
III
87
TRUE RMS MULTIMETER
III
iy4f.eps
Figure 3. Testing for Continuity
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