
24
Magtrol Model 5300 Three Phase Power AnalyzerChapter 9 - Calibration
VOLTS ZERO
1. Disable the auto zero function, refer to Special
Functions in Section 5.
2. Go to the 5300 VOLTS range that needs zero
adjustment.
3. Set the volts calibrator for zero volt DC output.
4. Adjust trim pot 78B146-R21 for zero (+ 0.0001%
max) VOLTS display reading.
This sets all voltage ranges - all ranges should be
zero + 0.0001% of range full scale.
AMPERES ZERO
1. Disable the auto zero function. See Section 5, CT/
PT Installation.
2. Go to the 5300 AMPERES range(s) that need
adjustment.
3. Set the current calibrator for zero amp DC output.
4. For the 5 amp range, adjust trim pot 78B146-R5,
25 amp range adjust trimpot 78B146-R10, and the
100 amp range adjust trimpot 78B146-R15 for zero
AMPERES display indication.
VOLTS SCALE FACTOR
1. Go to the 5300 VOLTS range(s) that need
adjustment.
2. Set the volts calibrator for an output equal to the
range maximum voltage.
3. Adjust the trim pot(s) so the VOLTS display reads
the full scale voltage as shown below:
For the 150 volt range, adjust 78B146-R27.
For the 300 volt range, adjust 78B146-R25.
For the 600 volt range, adjust 78B146-R23.
AMPERES SCALE FACTOR
1. Go to the AMPERES range(s) that need adjustment.
2. Set the current calibrator DC output to the range
maximum current and adjust trim pot(s) so the
AMPERES display reads the full scale current:
For the 5 Amp. range, adjust 78B146-R3.
For the 25 Amp. range, adjust 78B146-R8.
For the 100 amp range, adjust 78B146-R13.
Figure 17. Trimpot Adjustment Locations
Ø
-R23
Ø
-R25
Ø
-R27
Ø
-R21
Ø
-R13
Ø
-R15
Ø
-R8
Ø
-R10
Ø
-R3
Ø
-R5
Ø
-R23
Ø
-R25
Ø
-R27
Ø
-R21
Ø
-R13
Ø
-R15
Ø
-R8
Ø
-R10
Ø
-R3
Ø
-R5
Ø
-R23
Ø
-R25
Ø
-R27
Ø
-R21
Ø
-R13
Ø
-R15
Ø
-R8
Ø
-R10
Ø
-R3
Ø
-R5
Ø
-R29
Ø
-R26
Ø
-R24
Ø
-R21
Ø
-R18
Ø
-R13
Ø
-R10
Ø
-R5
Ø
-R2
Ø
-R29
Ø
-R26
Ø
-R24
Ø
-R21
Ø
-R18
Ø
-R13
Ø
-R10
Ø
-R5
Ø
-R2
Ø
-R29
Ø
-R26
Ø
-R24
Ø
-R21
Ø
-R18
Ø
-R13
Ø
-R10
Ø
-R5
Ø
-R2
78B146 78B147 78B146 78B147 78B146 78B147
Ø3 Ø2 Ø1
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