Fluke 93 Service Manual page 155

CORRECTIVE MAINTENANCE
7-29
202
mV-in from
A2d
203
204
206
207
ATTA-A
208
209
POS-CHA
331
332
501
502
503
504
506
507
+Vref
508
-Vref
509
511
521
522
523
r
I
-1
33
-0J3
-_AAylyL4
y^lAAAA:!
—
,.3
6
0
-3
0 Outpul
D2201
10kH2
OiitputN2201,
Voc
= -1-5V
10
kHz
ColleclorV2206
0
Base V2204
10
kHz
Collector
V2211
0
TP
for offset
DAC
0
POS-CHA
0
VREF
D2301
LF: sq.
10
KHz
SGN-in N2301
HF:
sq.
500
KHz
Voc =
2.3V
77
kHz
Collector
V2517,
Vpc
=
-7.7V
77
KHz Base V2517
73
KHz
Base
V2503,
Vqc *
-3,83
V
73
kHz Sense
Resistors, Pos. side
Vdc
=
-7.7V
73
kHz
Sense
Resistors,
Neg.
side
Voc =
-7.75V
0
+Vref
0
-Vref
0 Output N2501
0
TP
for
FEEDBACK
AMPLIFIER
100
kHz
PSG-lnputZ2501,
Vdc =
-1.1
mV
100
khz
Oscillator
N2503,
Vk
=
0.24V
0
INV
N2503
100
kHz
Collector V2526,
Voc=^'0.12V
524