Current Gain Calibration Setup Diagrams - Pacific Power Source LMX Series Operation Manual

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 is recommended. 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
recommended. 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: To guarantee that the current doesn't change during the calibration process, it is
recommended that the unit is operated at current limit, but reducing its set point to the
desired value. It is also recommended to use a stable load that provides a constant
linear impedance to the unit.
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
Figure 11-2Current Calibration Equipment Setup – 3 Phase Mode – Phase A
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LMX Series Power Source Operation Manual
DMM
LMX SERIES™ OPERATION MANUAL
Calibration
SECTION 11:
R Load
Hi Sense
Lo Sense
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