MT5 Multi-Tracer Operating Manual
page 64
7.2. Module Current Calibration
The module current calibration is similar to the module voltage calibration. However, a
stable, DC current source is required and a measurement of this current is needed. This
source must provide no more than 95% of the rated channel current limit, for example,
9.5 A for a 10 A rated channel. This ensures that the current signal will not be
inadvertently clipped causing a calibration error.
As with the voltage source, the current source must be floating and allow for the Multi-
tracer to provide the ground reference. Or at least, the current source must have a
similar ground. I.E., if the Multi-Tracer is configured for negative grounding, the current
source must be floating or negatively grounded.
During current calibration, the Multi-Tracer load will switch between open-circuit and
short-circuit conditions. Therefore, be sure the current source cannot output a voltage in
excess of the rated voltage of the channel when the load is at open-circuit and no
current is flowing.
After connecting the current source to the Multi-Tracer, turn the Multi-Tracer load on
using the check box shown below in Figure 33. The Multi-Tracer will turn the load on to
a near, short-circuit condition. At this time the current should begin flowing from the
current source.
Caution: Be sure the current source has been set to an appropriate level
before turning the load on. Or alternatively, that the source has been set to a
minimal level and then increased to the needed value after the load is turned
on.
As with the voltage calibration, enter the actual value and then press the “Adjust” button
to make the adjustment. Refer to the “Module Voltage Calibration” for details of using
the buttons on this dialog
