20
When line mode is selected, the P400 will trigger at the local AC line rate. An external
transformer must apply 4 to 24 VAC to the line trigger input connector on the rear
panel (Figure 5).
When REMOTE mode is selected, the P400 may be triggered by RS-232 or Ethernet
command.
Burst mode may be enabled or disabled using the menu item on Line 2. When burst
is enabled, the P400 generates N pulses for every M applied triggers, where N is
programmed on Line 8 of the menu, and M is set on Line 9. For example, if BURST
PULSES (N) is set to 4 and OF TRIGGERS (M) is set to 20 then, if the P400 is
triggered at a constant rate, the output would appear to be a burst of four pulses
followed by a gap corresponding to 16 missed triggers. The BURST REP PERIOD
item (Line 7) displays the time interval between bursts when internal triggering is
used; this is equivalent to PER * M.
Note: When using the P400 in burst mode with an external trigger source, the trigger
source must have a minimum pulse width of 25 ns.
5.6
Channel T0 Menu
Figure 8. Channel T0 Menu
Press the T0 key to display the Channel T0 menu. This menu is used to configure
the T0 output and to display the channel dependencies.
VH is the T0 output’s high level, and VL is the low level. The T0 output is always ON,
and may not be inverted. Output voltages will be halved when driving an external
50
Ω
load.