User Manual
AMETEK Programmable Power
BPS Series
71
5.2.5
MEASUREMENTS Screens
The BPS Series uses a DSP based data acquisition system to provide extensive information regarding the
output of the Source. This data acquisition system digitizes the voltage and current waveforms and
calculates several parameters from this digitized data. The result of these calculations is displayed in a
series of measurement data screens. The actual digitized waveforms can also be displayed by selecting the
Harmonics/Trace Analysis screen. A total of four measurement screens are used to display all this
information.
Figure 5-9: MEASUREMENTS Screen, Single Phase and Three Phase Modes
The first three Measurement screens available on the BPS Series are not menus in that no changes can be
made anywhere. Instead, these three screens provide load parameter readouts. The fourth measurement
screen provides access to the advanced measurements and does offer several user accessible fields. The
measurement screens can be reached by successively pressing the MEAS key, which will toggle to all four
available screens.
In three-phase mode, measurements are available for each phase individually. To select the desired phase,
use the PHASE key to toggle through phase A, B, C, or ABC. The ABC mode displays the data for all
three phases simultaneously.
The following parameters are available in the first three measurement screens:
Entry Description
MEASUREMENT 1
VOLTAGE
When in AC or AC+DC mode, this value is the true rms output
voltage measured at the voltage sense lines. In DC only mode, the
voltage is the DC voltage including polarity.
CURRENT
When in AC or AC+DC mode, this value is the true rms output
current drawn by the load. In DC only mode, the current is the DC
current including polarity
FREQ
When in AC or AC+DC mode, the output frequency is measured at
the sense lines. When in DC only mode, this value always reads “DC”.
POWER
In both AC and DC mode, this value is the real rms. power consumed
by the load.
MEASUREMENT 2
VA POWER
In AC or AC+DC mode, this value is the apparent rms. power
consumed by the load. In DC mode, this value is always the same as
the POWER readout.
PEAK CURR
This readout reflects the peak current value detected at the output. To
measure inrush current for a unit under test, open the output relay and
reset the peak current value using the PEAK CURR RESET entry.
Then program the output voltage and frequency and turn on the output
relay. The peak current measurement will continuously track the
maximum current value detected until reset.
POWER FACTOR
This readout shows the power factor of the load.
CREST FACTOR
This readout displays the ratio between peak current and rms current.
