PPA5xx/15xx user manual
7-10
7.4 RANGE - input channel options
All the input channels are fully isolated from each other
and from earth with very high CMRR (common mode
rejection ratio). They are controlled independently but
sampled synchronously.
Each input channel has an external input as well as an
internal shunt or high voltage attenuator. The external
input gives versatility in the input ranging by using
external shunts or attenuators. If the external shunt or
external attenuator option is selected, the data is scaled
by the appropriate value (entered under the relevant
channel menu).
The PPA1500/500 also features an ‘internal – x10’ input
mode, which applies a gain of 10 to the internal
attenuator/shunt signals, at the expense of bandwidth.
This input mode has a bandwidth of approximately
100kHz. Selection of this feature is indicated in blue in the
RANGE menu and in the Operating Mode displays.
Precision low inductance current shunts or current
transformers may be used with the current channels; high
voltage attenuators or oscilloscope probe may be used
with the voltage channels. Note that when using
external shunts or attenuators on high voltage
signals, the inputs must not exceed 1000V rms cat
II, or 600V cat III, to ground.
There are 8 input ranges with nominal full scale values set
with a 1:3:1 ratio. For convenience, the peak range
system has been converted to the equivalent rms ranges
on the next page of this manual, this gives the following
range system:
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