Calibration Procedures
7-9
Adjust VRA1 on board L until shunt current = 5.997 to 6.003A.
Adjust VRA3 on board L until display current = 5.997 to 6.003A.
Set the DC source to 5V/61A and current shunt range to 100/250A.
Set the load module to CCH mode and program the current to 60A.
Adjust VRA5 on board L until shunt current = 59.97 to 60.03A.
Adjust VRA7 on board L until display current = 59.97 to 60.03A.
CR mode adjustment:
Set the DC source to 15V/20A and current shunt range to 20A.
Set the load module to CRL mode and program resistance to 1 ohm.
Adjust VRA1 on board A until DMM (V) reading/1 ohm = shunt current
±
3mA.
CV mode adjustment:
Set channel L to CV mode and program CV voltage to 76V.
Set current limit of CV mode to 1A in configuration.
Set the DC source to 80V/0.1A.
Adjust VRA2 on board A until DMM (V) reading = 75.997 to 76.003V.
7.6 Calibration Procedures of MML-500-10-301
Reference voltage adjustment:
Connect DMM+ to TPA4 on board A , DMM
−
to TPA3 on board A.
Adjust VRA4 on board A until DMM (DC) =
−
10.2400
±
0.0005V.
Reference voltage check:
Connect DMM+ to TPA6 on board L , DMM
−
to TPA3 on board A.
Check DMM (DC) = 2.48 to 2.60V.
Software calibration procedures:
1. Measurement offset calibration
Short the module’s input terminals of
+
,
−
.
Press A/B and STATIC/DYNA simultaneously over two seconds to let the module
go to calibration mode.
The module displays:
LoFFS
<<
−
offset calibration of low range voltage
XXXX
xxxx: offset data of low range voltage measurement
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