WR6K-OM-E Rev A ISSUED: October 2003 401
USING NON-PROBUS PROBES
PMA2 Dialog Overview
PMA2 dialogs give you maximum flexibility by providing the correct units and scaling for power
measurements. When LeCroy probes equipped with the ProBus interface are used, correct units
and scaling are automatic. When non-ProBus current or voltage probes are used, PMA2 software
provides methods to enter the correct units and scaling for a variety of current and voltage
probes.
Units
When a channel is selected as the current input in the PMA2 setup dialogs, its units are
automatically changed to Amperes. After the assignment is made, data acquired through the
channel is treated as current in any math function. Therefore, multiplying a current channel
waveform by a voltage waveform results in watts, dividing a voltage waveform results in
resistance, etc. This allows the proper units to be displayed even when a shunt resistor and a
voltage probe are used to measure current.
Scaling
When a channel is selected as a current input or voltage input in the PMA2 setup dialogs, its
scale can be set to take into account the non-ProBus probe’s overall effective gain. This includes
gain as well as attenuation factors. For non-normalizing current and voltage probes, the
attenuation or gain can be set from /10,000 to X100 in a 1-2-5 sequence. There is also a Variable
selection, which allows you to set an effective gain.
For current or voltage probes with normalizing amplifiers, special factors can be applied so that
the amplifier’s readout can be entered directly into the dialog.
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