LMX SERIES™ OPERATION MANUAL
SECTION 11:
Entire Contents Copyright
2018 by Pacific Power Source, Inc. (PPS) • All Rights Reserved • No reproduction without written authorization from PPS.
LMX Series Power Source Operation Manual
Page 436 of 463
11.4.1
Current Calibration Load Values
Full-scale current gain calibration is best performed at current levels that are around 90% of full
scale current. Since the LMX Series® has only a single voltage range, maximum RMS current is
available at 120Vrms L-N for each phase. For single-phase mode, the current is three times
higher. Thus, to obtain 90% of load current, resistor value that is sized to draw this current level
at around 120Vrms is required. Since the maximum current varies by model and phase mode,
the table below shows the recommended resistor values or resistive load bank settings.
Three & Two Phase Mode
Single Phase Mode
Model
Rating/phs
VA
Max.
Irms/phs
Calibration
Current
Recommended
R Load (Ohm)
@ 125Vac
Max/
Irms
Calibration
Current
Recommended
R Load (Ohm)
@ 125Vac
105LMX
500
4.0
3.0
40
Ω
108LMX
800
6.0
4.0
30
Ω
112LMX
1200
10.0
8.0
15
Ω
140LMX
4000
32.0
25.0
5
Ω
160LMX
6000
48.0
40.0
3
Ω
305LMX
167
1.3
1.0
125
Ω
4.0
4.0
30
Ω
308LMX
267
2.0
1.6
78
Ω
6.0
6.0
20
Ω
312LMX
400
3.3
2.6
48
Ω
10.0
8.0
15
Ω
320LMX
667
6.0
5.0
25
Ω
18.0
15.0
8
Ω
345LMX
1500
12.0
10.0
12
Ω
36.0
30.0
4
Ω
360LMX
2000
16.0
12.5
10
Ω
48.0
40.0
3
Ω
Table 11-3: Calibration Load Values by Model and Phase Mode