Martel Electronics BetaGauge 321A-Ex - Manual (Page 7)

Figure 2 shows the location of the keys. Table 2 describes the function of each key.
Figure 2
Keypad
Table 2 Key Functions
No. Name Description
1 Function Keys These keys are used in various ways, primarily to config-
ure the calibrator
2 ON/OFF Key This key is used to turn the calibrator on and off
3 ZERO Key This key is used to zero pressure measurements
4 Backlight Key This key is used to turn the backlight on and off
Note: When the calibrator is turned on by pressing the ON/OFF key, it will go through a
short startup self-check routine. During that routine, the display shows the current
firmware revision level, auto shutdown status and the ranges of the 2 internal pressure
sensors. The calibrator requires a maximum of 5 minutes warm-up to rated accuracy.
Large changes in ambient temperature may require a longer warm-up period. See
section 2.3 for instructions on zeroing the pressure sensor displays. Pressure ranges
should be zeroed each time the calibrator is started.
2.1 Calibrator Display
The Calibrator Display consists of two regions: The menu bar (located along the bottom
of the screen) is used to access a menu system. The main display (the rest) consists of
up to three process measurement sub-regions. These sub-regions will henceforth be
referred to as the UPPER, MIDDLE and LOWER displays. Figure 3 shows the location of
the different display fields while table 3 describes them.
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