Fluke PM3082 Service Manual page 493

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Autocal of normal/invert position and gain adjustment
Normal invert position
ATCAL applies 0 V (GND) to the CH4 attenuator. YCAL is adjusted to mid screen via POS4 in normal
and in inverted mode. Then CH3 (normal mode only), CH2 and CH1 (normal mode only) are adjusted.
Gain adjustment
Gain is adjusted in various attenuator positions. ATCAL generates the required calibrated signals.
Error
Calibration step
code
Channel 4:
061 Offset normal
062
Offset invert
063
Gain position
064 Gain x1, 2mV/div
065
Gain /2.5, 2mV/div
066 Gain x1, 5mV/div
067 Gain /2, 5mV/div
068 Gain x1, 10mV/div
069
Gain /2,10mV/div
06A
Gain x1,20 mV/div
06B Gain /2.5, 20mV/div
06C Gain x1, 50mV/div
06D
Gain 12, 50mV/div
Channel 3:
071
Offset normal
073 Gain position
074 Gain x1, 2mV/div
075 Gain 12.5, 2mV/div
076 Gain x1, 5mV/div
Gain 12, 5mV/div
077
Gain x1, 10mV/div
078
Gain 12, lOmV/div
079
Gain x1,20 mV/div
07A
07B Gain /2.5, 20mV/div
Gain x1, 50mV/div
07C
Gain 12, 50mV/div
07D
CORRECTIVE MAINTENANCE PROCEDURES
• t f \ .
Input
Control signal
1 ATCAL POS4
I (A1/4/R4008)
(A1/8/R4308)
„• r > '
VAR4
• ATCAL
(A1/7/R4211)
POS3
1 ATCAL
J (A1/3/R3008) (A1/8/R3308)
1
VAR3
> ATCAL
(A1/7/R3211)
j
Output
YCAL
(A2/2/R1309)
YCAL
YCAL
(A2/2/R1309)
YCAL