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Adjustment – ATC-155 A/B
c
Turn the pre-set potentiometer R9 clockwise as far as
possible.
d
Switch the calibrator on using the power control switch.
e
Set the calibrator to –50°C.
f
Connect a voltmeter to CN8.
g
Adjust R9 until the voltage for CN8 reaches
a) 0.45V for PCB marked PCB 991025
b) 0.41V for PCB marked PCB 010125 or the latest PCB.
Adjustment – ATC-140/156/157 A/B
c
Turn the pre-set potentiometer R6/R16 counter clockwise as
far as possible.
d
Switch the calibrator on using the power control switch.
e
Set the calibrator to –50°C.
f
Connect a voltmeter to CN3.
g
Adjust R6 until the voltage for CN3 reaches 0.33V
h
Connect a voltmeter to CN6.
i
Adjust R16 until the voltage for CN6 reaches 0.33V
2.4.2 MVI Circuit for ATC-250/320/650 A/B
Necessary Equipment
Voltage stabilizer with output voltage 230V ±10V (or at 115V ±5V).
Set-up
PCB is adjusted when mounted in the calibrator.
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