Trigger Menu Front Panel Operation
5-18 PN: 10585-00001 Rev. P ML2437A/38A OM/PM
SOURCE [TRGSRC GTSRC]
The trigger sources are CONTINUOUS, Internal A, Internal B (ML2438A only),
EXTTTL, or MANUAL. When the trigger source is set to INT A or INT B (Internal A or
B) the power meter triggers on a rising or falling power level on the associated sensor.
See LEVEL for the setting of the trigger power level.
DELAY [TRGDLY GTDLY]
In Profile mode, DELAY sets the time delay (after the display trigger delay) to when
the system starts to take and display readings, represented by the left most cursor.
Enter 0.0 to 1.0 seconds, in ms or s.
In Readout mode (CUSTOM sensor mode), the value entered for DELAY is applied
after a trigger event, and before samples are taken. Enter 0.0 to 1.0 seconds, in ms or
s.
WIDTH [TRGGW GTGW]
Enter 100 ns to 7.0 s (the default is 20 ms). In Profile mode, WIDTH is the gate time the
system uses to perform a cursor average measurement. The time interval is
represented by the space between the left most cursor and the right most cursor.
Changing either cursor, or the gate width value, updates both the cursors and the gate
width value.
In Readout mode, this value defines the measurement gate width. A measurement is
presented as the average of all data taken in this gate width.
In Power vs. Time mode, the delay and width can be used to alter the update rate or
sample rate.
EDGE [TRGXTTL GTXTTL]
When set to External TTL, the power meter triggers on a TTL level rising or falling.
This selection sets the trigger for either a rising or falling edge.
Note
Changing the left most cursor, or the trigger delay time, updates the cursor or the
delay time value accordingly. In Profile mode, moving the cursor only allows
updates to the pixel resolution of the display. In Power vs. Time mode, the delay
and width can be used to alter the update rate.
Note
The averaging function averages a number of gate WIDTHS, so for a given
averaging number, larger WIDTHS will take longer to AVERAGE. Narrower widths
will average faster (but may yield a less-settled measurement).
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