THE MENU SYSTEM
PM1000+ Power Analyzer User Manual © Voltech 2010 Page 31
Scaling
When the 600 V and 30A inputs are used directly then the scaling for Volts and
Amps is 1, which is the default setting.
To use the PM1000+ with external voltage or current transducers, enter a scale
factor to have the PM1000+ display the true, scaled measurements.
Select Volts or Amps and press to enter the scale factor.
See the Chapter „Using External Voltage and Current Transducers‟ for further
information.
Frequency Source
To make accurate rms measurements the PM1000+ must first determine
frequency. Normally the PM1000+ detects frequency from the voltage signal
using proprietary algorithms.
If no voltage signal is present, or it is a chopped waveform, then it may be
necessary to select Amps as the frequency source.
Select Volts or Amps Frequency Source using the keys and press to
confirm.
Frequency Filter
For optimal frequency measurement performance when measuring voltage
signals below 20kHz, the Low Pass frequency filter can be engaged. If the
signal level on the voltage signal is less than 10% of range and the frequency is
known to be less than 20kHz, the Low Pass frequency filter is recommended.
Select Auto or Low Pass using the keys and press to confirm.
Shunts
The internal shunt of the PM1000+ is suitable for measurements in the range
20mA to 20A rms and this may be extended by the use of suitable current
transducers from uA to MA.
Some current transducers (including simple resistive shunts) produce a voltage
that is proportional to current. External Shunt Inputs are provided on the
PM1000+ for use with current transducers that provide a voltage output.
Because the 0V is common to both the internal and external shunts, only one
type may be connected at any time.
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