Lincoln Electric IM10090 ARC TRACKER - Manual (Page 21)

D-2 MAINTENANCE D-2
CALIBRATION PROCEDURE
Allow a 5 minute “warm-up” period for all instruments
and power source before applying a load.
Prior to performing the Calibration Procedure, the
accuracy of the ARC TRACKER™ digital meters
should be determined. In Table D.1 Measurement
Results suggested nominal set points are listed. The
power source and resistive load should be set approx-
imately to these voltage and current set points, e.g. 28
V @ 200 A, 36 V @ 400 A, etc. The reference meter
readings should be compared to the ARC TRACK-
ER™ digital meters.
The reference meter readings should be entered into
Table D.1 in the reference meter value column. The
ARC TRACKER™ meter readings should be entered
into Table 1 in the ARC TRACKER™ as found col-
umn.
The % deviation can be determined by calculation
using the reference meter values and the as found
values (see % Dev Equations). The - limits and + lim-
its can be determined by multiplying the reference
meter values by the desired accuracy of the ARC
TRACKER™ meters (for example, +2% limit = 1.02 x
reference meter value).
If the ARC TRACKER™ digital meters are within the
desired limits, calibration adjustments are not neces-
sary. As left and % deviation values should be
entered into Table D.1. If calibration is required, then
continue with the Adjustment Procedure.
ARC TRACKER™
TABLE D.1 MEASUREMENT RESULTS
Nominal Reference Arc Tracker % Deviation Arc Tracker % Deviation (+) Limit (-) Limit
Set Point Meter Value As Found As Found As Left As Left
DC Voltage
DC Amperes
28V
35V
44V
44V
44V
200A
400A
600A
800A
1000A
% Dev Equations:
% Dev
(As Found)
ARC TRACKER™ As Found - Reference Meter Value
Reference Meter Value
= x100%
% Dev
(As Left)
ARC TRACKER™ As Left - ARC TRACKER™ As Found
Reference Meter Value
= x100%