MT5 Multi-Tracer Operating Manual
page 61
7.1. Module Voltage Calibration
A source signal of known value is needed to calibrate module voltage. This voltage
value should be nearly equal to but not exceed the rated voltage of the module channel.
Take care when moving to different module channels. Special attention should be paid
to avoid applying excess voltage to lower-voltage channels.
Any stable DC voltage source may be used. Even a module under test can be used as
long as a separate voltmeter is used to determine the value of the applied voltage. This
voltage should be applied as if it were a PV module under test. The actually voltage
signal is measured by the voltage sense inputs, but this signal MUST be ground
referenced. For the most accurate measurements, these sense signals should be
referenced to the PV ground (GND) connection of the module connector in the same
way the module would be connected.
For example, if the channel is wired as a negative grounded channel, then the negative
sense lead should be referenced to this same ground. Similarly, if the module channel is
configured as positive ground, then the positive sense lead should be connected to the
MT5 Load unit ground on the module connector.
Note: This requires that the calibration voltage source have a floating output signal, or
selectable grounding that can be switched to either the positive or negative output.
To begin voltage calibration, press the “Module Voltage” button on the main calibration
page. The following dialog box opens: