BNC 6040 - Manual (Page 28)

28
OPERATING INFORMATION
Menu Keys
{MODE}
Sequences through the Mode menu and determines the type of output waveform
produced. The selections are Pulse, Impulse. CW. and External Modulation.
These are all module dependent. With no plug-in module. Mode defaults to
Pulse.
Pulse Mode provides flat topped pulses from the mainframe outputs (PULSE
OUT and ECL OUT) and the module output jacks(s). All of these outputs follow
the timing menu settings (adjustable Delay, adjustable pulse Width and Single or
Double Pulse). The Level menu controls Peak and Baseline amplitudes for the
module output. The mainframe PULSE OUT and ECL OUT output levels are
fixed (zero to +5 V and -0.8 V to -1.8 V respectively). The trigger source is
selected with the Trigger menu.
External Drive (on the Trigger menu) is available in this Mode for certain high-
speed modules. This allows the module to be digitally modulated (in some cases
at rates exceeding 100 MHz) via a connector on the front panel of the module.
The mainframe's PULSE OUT and ECL OUT are disabled in this slate of
operation.
Impulse causes the module to produce a pulse output of a fixed (narrow) width
and fixed amplitude. A corresponding pulse (of 5 ns duration) is produced from
the mainframe PULSE OUT and ECL OUT jacks. The Delay setting and Single or
Double Pulse selection can be made with the Timing menu (Width is inoperative).
The Level menu settings have no effect in this Mode. The trigger source is
selected with the Trigger menu, but External Drive operation cannot be used.
Impulse is not available with all modules.
CW causes the module to put out a continuous steady-state level as set by the
CW setting on the Level menu. The Trigger and Timing menus have no effect in
this Mode. CW is not available with all modules.
External Modulation allows the output of the plug-in module to be linearly
modulated about the level as set by External Modulation on the Level menu. The
modulation input is a connector on the front of the plug-in module. In this Mode,
the Trigger and Timing menu settings have no effect. This is not available with all
modules.
Front Panel Display:
< Mode: Pulse
>
< Mode: Impulse
>
< Mode: C.W.
>
< Mode: Ext Mod
>