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PPA55xx “KinetiQ” user manual
lighting ballasts can be easily addressed with special
modes application in the firmware of the instrument and
dedicated hardware functions including torque/speed
inputs and ac line sync.
The whole operation of the instrument may be controlled
remotely via a serial interface (RS232/USB), or optionally
LAN interface or GPIB interface.
The voltage and current channels are identical except for
the voltage attenuator and current shunt at the very front
end.
Each channel consists of a selection switch for external or
internal attenuator/shunt followed by a high impedance
buffer, bandwidth control then a series of gain stages
leading to an A/D converter. Selection of the input gain
and the sampling of the A/D converter are under the
control of the DSP. There is an autozero switch at the front
end for dc accuracy. The analogue circuitry is optimised for
high linearity over a wide dynamic range and high
frequency performance.
Both input channels are fully isolated with very good CMRR
and noise rejection.
The current shunt is of a proprietary design which gives
very wide bandwidth with minimum phase shift.
The voltage attenuator is of a proprietary design which has
a wide bandwidth response matched to that of the current
shunt.
Both the voltage and current channels are calibrated
digitally so there are no physical adjustments to be made.
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