Teledyne LeCroy PXA125 - Manual (Page 78)

User Manual PXA125
3-64 ArbConnection
has not been updated yet with the new parameter.
Pressing Execute will update the instrument and
will restore the color of the digital readout to dark
blue, indicating that the displayed value is the
same as the generator setting.
Also note that the digital readout has an autodetect
mechanism for the high and low limits. You cannot
exceed the limits if you are using the dial but only
if you use the keypad. In case you do, the program
will not let you download an illegal parameter and
you’ll be requested to correct your setting.
Figure 3-38. The Trigger Panel
Slope The Slope group lets you select edge sensitivity for the trigger input of
the PXA125. If you click on Positive, the instrument will trigger on the
rising edge of the trigger signal. Likewise, if you click on Negative, the
instrument will trigger on the falling edge of the trigger signal.
Source The Source group provides access to trigger source parameters.
Click on External to enable the rear-panel TRIG IN connector. If you
select the external option, you must connect your stimulating signal to
the trigger input. You can also use the Manual button to trigger the
instrument. If you select the Internal option, you will be replacing the
external signal with an internal, free-running, synthesizer that is
connected internally to the trigger input. The period of the internal