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Magtrol Model 5300 Three Phase Power Analyzer

Chapter 9 - Calibration

AMPERES CALIBRATION CHECK

DC:

1. On the 5300, press the 5 AMPERES range push-

button.

2. Set the current calibrator for zero amperes and

operate mode. The AMPERES display should read

zero + 0.0001% max of range full scale.

3. Set the current calibrator for + 5 Amperes DC. The

AMPERES display should read 5.000 Amps.

Record the current readings.

4. Set the current calibrator for - 5 Amperes. The

AMPERES display should read 5.000.

5. Repeat the above for the 25 and 100 Amp ranges.

6. Compare the above readings to the values given

in Section 2 - Specifications.

The (+) and (-) readings should be within ± 2 least

significant digit (LSD) of each other.

AC:

1. Set the current calibrator for 60 Hz. and repeat the

current checks outlined above.

NOTE: If a beat frequency effect is

experienced between the

calibrator output and the 60 Hz

power line frequency, try setting

the calibrator for 80 Hz instead of

60 Hz.

2. Set the current calibrator to standby mode.

WATTS CALIBRATION CHECK

This step calls for the simultaneous application of

voltage and current to the 5300 PA.

DC:

1. On the 5300, select a VOLTS and AMPERES

range.

2. Set the volts and current calibrators for a voltage

and current near the center of each selected range.

Switch the calibrators to OPERATE mode.

3. The WATTS readout should show a power that is

the product of the VOLTS and AMPS indications

( POWER = V × I ).

4. Compare the 5300 PA WATTS readout to the

product of VOLTS and AMPS from the calibrator's

output.

This difference is the WATTS error.

AC:

POWER = V × I × Cos θ

where = phase angle between volts and amps.

NOTE: Maximum true power is

delivered only when θ = zero

degrees (cos θ = 1). Therefore,

the volts calibrator variable phase

adjustment is set for zero phase

between the volts and amps at the

input to the 5300 PA. Refer to

the calibrator instruction manuals

for this adjustment procedure.

The phase shift control should be carefully set to provide

a peak 5300 PA WATTS indication, corresponding to

zero volts to amps phase angle. Repeat the procedure

as used for the DC power verification and record

readings.

Compare the recorded reading to the values given in

Section 2 - Specifications.

MINOR ADJUSTMENT (IF NEEDED)

NOTE: All trim pot adjustments are

located on the 78B146 and

78B147 circuit boards of the

5300. See Figure 17 for trimpot

adjustment locations.

Lethal voltages are present. Take

appropriate safety precautions.

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