Test Of Converters - ISA T1000 PLUS User Manual

DOC. MIE91093 Rev. 1.34 Page 105 of 145
1.13 T
EST OF CONVERTERS
There are many types of converters: current; voltage; power;
power factor; frequency. The most common converter has a
DC current output; the amount of current is proportional to
the parameter, given the conversion factor. For many of these
converters, the zero value corresponds to 4 mA; this value
must be subtracted to the measured one prior to convert it
into the measured parameter.
The following connection scheme shows the connection of
current, AC voltage, DC voltage to the converter, and the
connection of the converter output to the low range DC current
measurement input of T1000 PLUS. This scheme applies to
converters having a conversion error of 2% up. For more
accurate tests, you need a reference converter. In this
instance, connect both converters (currents in series; voltages
in parallel), and measure the error between the current of the
converter under test and the reference converter.