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Theory of Operation M703E Calibrator Operator’s Manual
9.3.1.1. Calibrator Status LEDs
Three LEDS are used to inform the user of the instruments basic operating status
Table 9-3: Front Panel Status LEDs
Name Color Behavior Significance
Main Message
Field
N/A
Displays Warning
messages and Test
Function values
At initial start up the various warning messages will appear
here.
Mode Field N/A
Displays
“STANDBY”
Instrument is in STANDBY mode.
STATUS LEDs
Active Green OFF
Unit is operating in STANDBY mode.
This LED glows green when the instrument is actively
producing calibration gas.
Auto Yellow OFF
This LED only glows when the calibrator is performing an automatic
calibration sequence.
Fault Red BLINKING
The calibrator is warming up and therefore many of its subsystems
are not yet operating within their optimum ranges. Various warning
messages will appear.
9.3.1.2. Keyboard
A row of eight keys just below the vacuum florescent display (see Figure 9-10) is the main method by which the
user interacts with the calibrator. As the software is operated, labels appear on the bottom row of the display
directly above each active key, defining the function of that key as it is relevant for the operation being
performed. Pressing a key causes the associated instruction to be performed by the calibrator.
Note that the keys do not auto-repeat. In circumstances where the same key must be activated for two
consecutive operations, it must be released and re-pressed.
9.3.1.3. Display
The main display of the calibrator is a vacuum florescent display with two lines of 40 text characters each.
Information is organized in the following manner (see Figure 9-10):
MODE FIELD: Displays the name of the calibrator’s current operating mode.
MESSAGE FIELD: Displays a variety of informational messages such as warning messages, operation
data and response messages during interactive tasks.
KEY DEFINITION FIELD: Displays the definitions for the row of keys just below the display. These
definitions dynamic, context sensitive and software driven.
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