Functional description
R&S
®
TS-PSM5
19
User Manual 1178.2809.02 ─ 01
Figure 5-1: Application example - measuring current with active load
The relatively high current , which in the load’s switched on active state flows through
the 50 A channels, can be determined via a current-voltage-converter (I-V). The output
voltage of the converter is conducted via the R&S TS-PSM5’s matrix- or coupling
relays to the analogue bus of the R&S TS-PWA3 chassis and from there to, for exam-
ple, the R&S TS-PSAM measurement module. The measurement module’s voltmeter
ascertains the voltage. Via the rspsm5_GetCalculatedCurrent function of the IVI soft-
ware driver that is part of the R&S TS-PSM5 , the current belonging to this voltage
level can be retrieved. It is calculated via correction values stored on the module. See
also the programming example later on in this document.
When current flows from the NO- to the COM- Connection of a 50 A channel gives a
positive voltage value at the current-voltage-converter. If the current flows in the
reverse direction, a negative voltage value is measured.
The current paths are coloured red in the diagram above, the lines with sense voltage
are blue and the paths over which the current-voltage-converter´s voltage is measured
are coloured green.
R&S TS-PSM5