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California Instruments 61
User Manual Compact i/iX Series
ENTRY DESCRIPTION
ST PHASE Selects the start phase angle for output changes made to either
voltage or frequency. This allows changing the output at a specific
phase angle. The ON/OFF key also uses this phase angle setting to
program the output voltage up to the set level after the output relay
is closed. The default value for this field is RAND. To set the start
phase angle, set the cursor to the ST PHASE field and use either
shuttle knob to adjust between ± 360°. To set to RAND, use the
BACK key.
California Instruments 62
User Manual Compact i/iX Series
4.2.6 MEASUREMENTS Screens
The i/iX Series uses a DS regarding
the output of the Source. T ms and
calculates several parame
in a series of measuremen creens are used to display all
t
P based data acquisition system to provide extensive information
his data acquisition system digitizes the voltage and current wavefor
ters from this digitized data. The results of these calculations are displayed
t data screens. A total of three measurement s
his information.
Figure 4-7: MEASUREMENT Screen
s available on the iX Series are not menus in The Measurement screen that no changes can be made
anywhere. Instead, these screens provide load parameter readouts. The measurement screens can
b successive . Note
th s models, on
measurement screens are
The following parameters
e reached by
at for i Serie
ly pressing the Meas key, which will toggle to all available screens
ly the first two screens are available. For the iX series, all three
available.
are available in the measurement screens:
ENTRY DESCRIPTION
MEASUREMENTS 1
VOLTAGE This value is the true rms output voltage measured at the voltage
sense lines.
CURRENT This value is the true rms output current drawn by the load.
FREQ The output frequency is measured at the sense lines.
TRUE POWER This value is the real power.
MEASUREMENTS 2
VA POWER This value is the apparent power.
POWER FACTOR This readout shows the power factor of the load.
PEAK CURRENT This value is the instantaneous peak current. See also PEAK CURR
in MEASUREMENTS 3 screen.
CREST FACTOR This readout displays the ratio between peak current and rms
current.
MEASUREMENTS 3 (iX Models only)
CURR THD This readout displays the total current distortion for the selected
phase. The distortion calculation is based on the H2 through H50
with the RMS 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
California Instruments 63
User Manual Compact i/iX Series
ENTRY DESCRIPTION
the fundamental component as the denominator. This mode can
only be programmed over the bus by sending the
“MEAS:THD:MODE FUND” command. At power up or after a reset
command, the mode will revert back to RMS.
PEAK CURR 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 BACK key. 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. See also PEAK CURRENT in
MEASUREMENTS 2 screen.
VOLT THD This readout displays the total voltage distortion for the selected
denominator.
t as the denominator. This mode can
phase. The distortion calculation is based on the H2 through H50
with the RMS voltage in the denominator. Note that some definitions
of THD use the fundamental component (H1) of the voltage as the
If desired, the user can program the power source controller to use
the fundamental componen
only be programmed over the bus by sending the
“MEAS:THD:MODE FUND” command. At power up or after a reset
command, the mode will revert back to RMS.
PHASE Relative voltage phase angle measurement with respect to phase A.
This readout is only relevant if an external clock source is used.
Update Program Functions from Measurement Screen
The Shuttle knob can be used to update voltage and/or frequency settings while the measurement
rea out screen is displayed. T o, sel e SET
sc en using the left arrow cur en, s AS
button. While the measurement screen is v
d
re
o do s
sor. Th
ect the desired parameter to be change while in th
elect the measurement screen by pressing the ME
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