Ametek CSW5550 User Manual page 95

User Manual
3.15.3.2 Trigger source
The CSW Series offers a choice of trigger sources in front panel operation mode. The following
trigger sources are available from the HARMONICS/TRACE ANALYSIS, TRIG SOURCE field:
Immediate (IMM)
Phase (PHASE A)
Voltage step (SET VOLT)
CSW Series
This mode is appropriate for capturing repetitive events or to
monitor the source output continuously. Display updates will
occur about once per second.
This mode causes a trigger to occur as soon as the ENTER key
is pressed with the cursor on the START field. No trigger
source needs to be specified for this trigger mode. This mode is
equivalent to the INIT:IMM:ACQ bus command.
This trigger source is appropriate if no trigger condition is
known or desired. When using this trigger source, the
acquisition is always triggered.
This mode causes the CSW acquisition system to wait for a
specified phase angle on the phase A voltage output. This
allows the acquisition to be positioned in time with respect to
any phase angle on phase A, B or C. Note that phase A, B and
C are typically at 0°, 240° and 120° with respect to the specified
trigger phase in this field. An example of this trigger source
mode is shown in Figure 3-43.
When selecting this trigger source, the field below the TRIG
SOURCE field changed to "TRIG PHASE =". Use this field to
enter the desired voltage phase angle to trigger the
measurement on.
This mode is appropriate when capturing analyzing events at a
specific phase angle such as the zero crossing of the voltage.
Note that the phase angle of the current with respect to the
voltage is determined by the load, so triggering at a specific
phase current angle is not possible as it is not controlled by the
AC source. However, when capturing current waveform data,
the phase relationship to the voltage can be determined easily
by triggering at the 0° point on the voltage.
This mode performs two functions. It programs the output
voltage for the selected phase or phases to the rms or DC
value specified and it triggers the measurement acquisition at
the same moment in time.
When selecting this trigger source, the field below the TRIG
SOURCE field changed to "SET VOLT =". Use this field to enter
the desired voltage to program the output to and trigger the
measurement on. If only one phase in a three phase system is
selected, only that phase's output will be programmed. If all
phases are selected, all three phases' outputs will be
programmed. Use the PHASE key to select the desired phase
or all phases. Figure 3-42 shows an example of using the SET
VOLT trigger source to capture the turn-on of the voltage. In
this case, a negative trigger delay was specified and the
voltage start phase angle was set to 90° in the PROGRAM 2
screen.
California Instruments
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