AFX SERIES® OPERATION MANUAL
SECTION 11: CALIBRATION
Entire Contents Copyright
2016 by Pacific Power Source, Inc. (PPS) • All Rights Reserved • No reproduction without written authorization from PPS.
AFX Series Power Source Operation Manual
Page 265 of 274
7.
Enable the Output with no load connected
8.
Enter the DMM VAC readings for all three phase in the respective Voltage data entry
text boxes in the Calibration screen. Move the DMM probe from phase A, to B to C
respectively to obtain each phase reading.
9.
Press "Cal V. gain" soft key
10.
Wait for the V gain coefficients for all phases to be calculated and displayed
Note:
Voltage gain can be calibrated in DC mode as well if this is the predominant mode of
use. Use the MODE fields at the top to select the desired mode.
11.4.4
Current Gain Calibration Setup Diagrams
For current calibration, a resistive load equivalent to 90% of maximum available RMS phase
current for the phase mode selected needs to be connected. It is permissible to use only one
load and move it between phases for three phase mode calibration. For single phase mode
current calibration, a load capable of supporting 90% of maximum available single phase current
is required. The A, B and C outputs must be shorted together for single phase mode operation.
The optional Single Phase Shorting Connecter (P/N 160086) can be used to accomplish this.
Note:
Make sure the resistive load used for calibration has sufficient thermal mass and/or
cooling to minimize drift. Allow the load to settle if there is any indication of thermal
drift before performing the calibration step.
A suitable current shunt must be connected in series with the load as shown below for three
phase mode. The sense terminals of the current shunt must be connected to the DMM Voltage
input.
Three Phase Mode Setup
AC Line
Input
DMM
Hi Sense
Lo Sense
R Load
A B C N N N
Figure 11-2: Current Calibration Equipment Setup – 3 Phase Mode – Phase A
Summary of Contents for 3120AFX
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