Calibration; Introduction; Calibration Procedure - ISA T 1000 Plus Introductory Manual

DOC. MIE92093 Rev. 1.34 Page 96 of 108
4.16 C
ALIBRATION

4.16.1 Introduction

T 1000 PLUS does not need to be calibrated, as metering circuits
employ high stability components.
It is suggested to check the unit every 2 years, by comparing T
1000 PLUS measurements to external meters. Tests should be
performed with an high accuracy multi-meter, that should
guarantee a maximum AC measurement error of 0.1%, both for
voltage and current. Besides, as such multi-meters do not have
current ranges greater than 2 A, for the test of the high current
ranges it is necessary a class 0.1 measurement Current
Transformer. The adoption of lower-class instruments may cause
false interventions, that introduce errors into the test set. . Last,
as internal generators follow the mains, it should be stable
enough to allow for a stable generation.
At the end of the test, if deviations are not acceptable it is
possible to enter the calibration mode, as explained in the
followings.

4.16.2 Calibration procedure

The calibration mode is accessed by pressing push-buttons < and
> at the meantime, and powering on T 1000 PLUS. After a
confirmation message, the following window is opened.
The calibration is divided in two: measurements and phase
angles.
For the measurements, after the selection, the following window
is opened.