13
The activity annunciator (Figure 2b) flashes to indicate that readings are being
taken on the display channel as indicated in the upper righthand corner of the
display. A steady glow indicates that the meter is armed and waiting for a
pulse or P-P waveform to arrive. The indicator is off when data acquisition on
the displayed channel has been stopped.
2.3.17 EXT, External Trigger
EXT enables and disables the triggering of data acquisition through the rear
panel trigger input BNC connector. The meter can be configured to be
triggered by either a rising or falling edge TTL signal. See Section 2.4.9.
Press EXT to light the EXT annunciator and enable the external trigger input to
both channels. The Model 2835-C will still respond to triggers from the R/S, R/S
A, or R/S B keys even when the EXT trigger is enabled. Press the EXT key a
second time to turn off the annunciator and disable the external trigger input.
2.3.18 MENU
The MENU key provides access to advanced features and parameters. Press
the MENU key to stop all data acquisition, light the MENU annunciator, and
display the first item of the top level menu list. Press the MENU key a second
time to immediately exit the menu. Menu structure and functions are pre-
sented in Section 2.4. The menu consists of a series of lists and parameter
values. Most parameter values can be edited to configure the meter. Lists are
moved through via the
, keys. To move to a lower level list, press the
ENTER key. To escape a lower level list, press the ESC key.
In the menu, all key functions are ignored except for the MENU, ENTER, ESC
and the
, keys. Each key will act without having to initially press SHIFT.
Pressing SHIFT will toggle the SHIFT annunciator, but it will not effect anything
else when in MENU mode.
To edit a displayed parameter press ENTER. This enables the edit mode and
causes the parameter (or a digit) to blink. Press the
, keys to adjust the
parameter through its allowed list or to count the blinking digit up and down.
When adjusting a numerical value, the , keys can be used to change
which decimal digit blinks. Press ENTER to adopt the new value and escape
the editing mode. Press ESC to leave the editing mode without adopting the
new value.
2.3.19 ENTER
ENTER allows one to move lower into the menu when in menu mode, to enter
editing mode when an editable parameter is being displayed and to adopt a
new parameter value after it has been edited. Editable parameters can be
found both in and out of the menu mode. If ENTER is pressed when a non-
editable parameter is being displayed, the key press is ignored.
2.3.20 ESC, Escape
ESC allows one to escape to the next higher level when in menu mode and to
escape editing mode when editing a parameter value without adopting any
changes to the parameter. At the top level of the menu, pressing the ESC key
exits the menu mode. The ESC key also allows one to escape various other
display modes such as STATS or wavelength display or amplifier signal gain
range display modes. When there is nothing to escape from, the ESC key is
ignored.
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