Routine measurement calibration, 3 routine measurement calibration – AMETEK MX15 Series User Manual

Page 124

User Manual

– Rev M

California Instruments

MX15

124

6.3 Routine Measurement Calibration

The MX Series controller measures voltage and current by digitizing both voltage and current
waveforms on each available output phase. This data is subsequently processed and use to
calculate all measurement parameters such as VRMS, IRMS, Power, VA, Frequency etc. To
calibrate all measurements, only the voltage and current measurement need to be calibrated
specifically. All other measurements are derived from these.

Connect the test equipment to the power source as shown in Figure 6-1. If the power system is
a multi-cabinet system with one controller, the DVM for calibrating the measurement voltage
should always be connected to the Remote Sense connector on the Master cabinet.

Note: The Fluke 8506A Digital Multimeter must be used for the following calibration. The

8506A must be set to the AC HI ACCUR mode for all AC measurements.

The shunt must be connected to the power source as shown in Figure 6-1. If the Current
Measurement can’t be successfully performed, adjust the Current Measurement Pot on the
System Interface board. This adjustment is described in the Non-routine Calibration section of
this manual. If the DC current measurement displays more than 70 counts on the display,
perform the non-routine current monitor adjustment.

Connect the load to the output. Use the 1 mOhm current shunt in series with the load to
measure the AC and DC load current. When programming a DC load always program the output
voltage to 0 volts before changing the output load. This will prevent load switch contacts from
being damaged.

To calibrate all measurement functions, the desired value for the measurement value of current
or voltage must be entered for the corresponding calibration value. Make the indicated
adjustments by typing in the desired display value. This should be the value indicated by the
external DVM. If a 1 mOhm current shunt is used for current, 30 mV represents 30 amps.

The Calibration Load Table shows required load bank settings for the current measurement
calibration procedure. The following text is a detailed explanation of the procedure.

Note that the voltage measurement calibration is only required on the high voltage range. The
same voltage measurement calibration coefficients are used on both voltage ranges.

Note that the current measurement calibration is only required on the low voltage range

–

maximum available current range. The same current measurement calibration coefficients are
used on both voltage ranges.

PARAMETER

POWER SYSTEM

Model --->

Lowest Range

MX15-1 / MX15-1Pi

MX30/2-1(Pi)

MX45/3-1(Pi)

150 VAC / 200 VDC

AC Current Full Scale

1.0



, 14.4 kW

0.5



, 30KW

0.33



, 44 kW

DC Current Full Scale

2.67



, 9.6.kW

1.33



, 7.5KW

0.9



, 28.5 kW

300 VAC / 400 VDC