Diode Test - Fluke 8062A Instruction Manual

Test and Symptom
Resistance Test (cont)
Low range readings correct,
high range readings off
Current Test
Constant reading of 0.00
Fuses F1 and F2 good, but
current readings off
High crest-factor ac current
readings off
Continuity Test
No response
No tone

Diode Test

No readings or very low
readings
BT Indicator
BT indicator not displayed
when battery voltage is
less that 5.6V
Table 4-6. Troubleshooting Guide (cont)
Possible Cause/Suggestions
Q3 and Q4 leak-check by seeing if
M reads OL with open input. Main
pcb contaminated - clean carefully
and check performance.
Check fuses F1 and F2 with fuse
check procedure in Chapter 2-4.
Switches and resistors in current
shunt.
U1
Select switch decoding self-test
check for proper function decoding
and also confirm that the continuity
comparator responds. R31, S1A
Q6, R4, LS1. Check U3-1 (tone
output) with scope for 2.667 kHz
signal.
CR1 (diode test source). To check
CR1, select diode test, connect an
external 1 k resistor across the
inputs and measure the voltage
across the resistor
approximately 1V ( 10%).
U3, Z4-U3 compares voltage at pin
18 (BT1) with voltage at pin 10
(COM-analog common voltage). BT
turns on if U3-18 voltage is greater
than common. turns off if it is less
( 50 mV)
Maintenance
Troubleshooting
should be
4
4-25