Figure 4-6: Measurement Screen - Ametek California Instruments MX15 Series User Manual

4.2.6 MEASUREMENTS Screens
The MX 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 results of these
calculations are displayed in a series of measurement data screens. A total of three
measurement screens are used to display all this information.
The Measurement screens available on the MX15 Series are not menus in that no changes can
be made anywhere. Instead, these screens provide load parameter readouts. The measurement
screens can be reached by successively pressing the Meas key, which will toggle to all available
screens. Note that for -1 Series models, only the first two screens are available. For the –1Pi
series, all three measurement screens are available.
The following parameters are available in the measurement screens:
ENTRY
V OLTA GE
CURRENT
FREQ
TRUE POW ER
V A POW ER
POW ER FA CTOR
PEA K CURRENT
CREST FA CTOR
CURR THD
PEA K CURR
MX15 Series

Figure 4-6: MEASUREMENT Screen

This value is the true rms output voltage measured at the voltage sense lines.
This value is the true rms output current drawn by the load.
The output frequency is measured at the sense lines.
This value is the real power.
This value is the apparent power.
This readout shows the power factor of the load.
This value is the instantaneous peak current. See also PEAK CURR in M EA SUREM ENTS 3
screen.
This readout displays the ratio between peak current and rms current.
MEASUREMENTS 3 (iX Models only)
This readout displays the total current distortion for the selected phase. The distortion
calculation is based on the H2 through H50 with the RM S current in the denominator.
Note that some definitions of THD use the fundamental component (H1) of the current as
the denominator.
If desired, the user can program the power source controller to use the fundamental
component as the denominator. This mode can only be programmed over the bus by
sending the "M EA S:THD:M ODE FUND" command. A t power up or after a reset command,
the mode will revert back to RM S.
This readout reflects the highest peak current value detected at the output. This is a
track and hold peak current measurement. To measure inrush current for a unit under
test, open the output relay and reset the peak current value using the BA CK key. Then
program the output voltage and frequency and turn on the output relay. The peak current
DESCRIPTION
MEASUREMENTS 1
MEASUREMENTS 2
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