User Manual – Rev BE AMETEK Programmable Power
MX Series 175
This trigger source is appropriate if no trigger condition
is known or desired. When using this trigger source, the
acquisition is always triggered.
Phase (PHASE A) This mode causes the MX 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 4-41.
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.
Voltage step (SET VOLT) 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 4-40 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.
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