BNC 6040 - Manual (Page 19)

19
OPERATING INFORMATION
FRONT PANEL DESCRIPTION
Power Switch
The power switch, located in the lower left comer of the front panel, is keyed to prevent unauthorized
use. The key can be removed only when the switch is turned to the off position.
LCD Display
The 6040 has a 20-character liquid crystal display (LCD). This displays all menus and data while the
unit is being programmed from the front panel. In the following descriptions the display for each menu is
given.
LED Annunciator
The front panel has a set of seven LED indicators on the left side of the panel. The upper four LEDs.
labeled PULSE, IMPLS (Impulse), CW (Continuous Wave) and MOD (External Modulation), reflect the
current Mode setting. This allows continuous monitoring of the Mode setting.
The next two LEDs, labeled TRIG'D (triggered) and OVRLP (overlap), are used to indicate the status of
triggering in the Pulse and Impulse Modes. The TRIG'D LED is illuminated if there is a signal present at
the front panel TRIG IN jack that exceeds the threshold setting for an external trigger. The OVRLP LED
indicates that a potential triggering error exists. It blinks when the combination of rep rate. Width and
Delay results in some pulses not being generated. This occurs when the Minimum Pulse Separation
and Maximum Delay conditions are not met (see the Specifications section).
Finally, the bottom LED is labeled REM (remote) and indicates that the 6040 is under remote computer
control (via GPIB or RS-232).
Keypads
The 6040 has two keypads. The left keypad is used to control the operating state (Trigger, Timing,
Mode, etc.) and to modify existing parameters (increment/decrement value). The right keypad is used
primarlily to enter numeric data for new parameters. It is also used to toggle the states of certain
parameters (e.g. Single Pulse/Double Pulse) and to trigger the instrument under Single Cycle
operation.
WARNING: To remove all ac power from the unit, the line cord must be unplugged.