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.
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