Fluke 93 Service Manual page 104

5-8
CALIBRATION
ADJUSTMENT
PROCEDURE
H4.
Hardware
offset
and
gain
Purpose: optimal
response
of
complete analog
A2
circuitry.
Calibration
equipment:
Fluke 51CX)B
Calibrator
Calibration setup:
Procedure:
A
-
Connect
Test Point
TP209
on
the
analog
A2
PCB
to
GROUND.
The
posftlon of
Test Point
TP209
can be
found
In
section
10: figure
10.4 (A2
PCB
layout
wired components
side).
B
-
Apply a
1
kHz
sine
wave
signal with
an
amplitude
of
720
mV AC
peak-to-peak
to
the
channel
A
BNC
ccffinector.
(Set the
Fluke
5100B
to
254.56
mV
RMS,
1
kHz
sine
wave.)
C
-
Turn
the potentiometers
R2346 and R2347
sc
that
the
sine
wave
on
the
LCD
is
exactly
6
divisions:
maximum
(peak)
on
divisions,
minimum
(peak)
on
-3 divisions (tolerance
±1
dot).
D
-
Press
the
READY
softkey.
5.6.2
Closed
Case
SCOPE
Calibration
Adjustments
NOTE;
The
foHowiag
calibratiori
adjustments are done
electronically.
For
these calibrations, the
ScopeMeter must be
in
a
fully
assembled
state!
S5. Offset correction
Purpose:
remove
offset
of
channel
A
and
B
input operational
amplifiers.
Calibration
equipment:
none.