Fluke 8506A Instruction Manual page 224

8500
Series
-03
Zero
noisy or
out of
tolerance
No
zero reading
Always
zero
IOOjuA,
1
mA,
10
mA
ranges bad, others
OK
100
mA,
1
A
ranges bad, others
OK
High random
—
full-scale
readings
No
display
No
ACK —
Error 9 or Error 4
Only 100
jUA
range bad
Only
1
mA
range bad
Only 10
mA
range
bad
Only 100
mA
range bad
Only
1
A
range
bad
Q21
,
Q20, Q29, U1
,
Q3, Q4, leaky
output
FETS
K3,
K4.Q19, U1,
Q1,Q2
K3
or
Q1
1
open
K4
open,
Q29, Q20, leaky protection diodes
020, Q29,
leaky protection diodes,
Q12
Q19,
U1,Q1,Q2
U5,
U2
Voltage
limit circuit,
U6
or leaky diode
(CR14,
CR15), U5,
Q18
030, 031,
Digital
Control
Q7,
Q1
0, Digital
Control
Q8, Q9, Digital
Control
K2, Q32,
Digital
Control
K2, Q28, Digital
Control
[•1
Drains (1012
resistors)
—
—0.6
V
dc
Sources (40 K12 resistors)— 8.0
V
dc
U1
pin
6-
0V
dc
1.
AC/DC
Reference (ground)
2.
Frequency
response
in
AAC
3.
RT1
outputs
are
applied to
DC
Signal
Conditioner
for
DC
and
to
optional
AC
module
for
AC
(DC
Signal
Conditioner bypassed)
!f
Q19,
R15, R16, R55,
or
R56
are replaced,
it is
necessary to return the
module
to
the factory
(attn:
PARTS)
for
temperature compensation.
Current
LO
Input (K3)
and Output
FET
(Oil)
DC
Reference (Q3)
AC
Reference (Q4)
IOOjuA
Range
1
mA
Range
1
0
mA
Range
100
mA
Range
1
A
Range
Voltage Check
Reset
0
ID
1
1D2
3
I
603-8
3/83