AMETEK MX Series Rev: AY - Manual (Page 138)

User Manual – Rev AY AMETEK Programmable Power
MX Series 138
4.6.3 Triggering Measurements
Both FFT results and waveform acquisitions may have to be positioned at a specific moment in
time. To allow the data acquisition to coincide with user specified events, the measurement
system can be triggered in different ways. Trigger modes are available from both the bus and the
front panel. If one of the remote control interfaces is used, acquisitions may also be triggered
from the transient list system. Refer to the programming manual for details on this mode of
operation.
4.6.3.1 Trigger mode
The following trigger modes are supported by the MX Series 3Pi controller:
Single (SINGLE) This mode causes the acquisition system to be armed only
once. The MX source waits for the user to press the ENTER key
while on the START field. As soon as the trigger event specified
occurs, data is acquired and the acquisition system is put in an
idle state. A new user initiated START event must be given to
trigger an new acquisition.
This mode is appropriate for capturing events that occur only
once such as the inrush current when turning on a load.
Continuous (CONT) This mode causes the trigger system to re-arm itself after each
trigger event. Every time a new trigger event occurs, new data is
acquired and the LCD display is updated. No user intervention is
required after the initial START event.
This mode is appropriate for capturing repetitive events or to
monitor the source output continuously. Display updates will
occur about once per second.
4.6.3.2 Trigger source
The MX Series 3Pi controller 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) 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.
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 4-40.
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.