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XDT User’s Manual
16
3.4.2 Display Conventions
1. To display characters with the 7 segment numeric display, the following pseudo-alphanumer-
ics are used:
Numbers:
0 123456789
0123456789
Letters:
ABCDEF GH IJ LNOPQRS TUXYZ
ABCDEFGH I JLNOPQRSTUXYZ
Symbols:
?-.
?-.
2. The instrument will indicate whether a particular mode allows changing a parameter by show-
ing the word “SET” in the upper left corner of the display. Be careful not to change any
parameter inadvertently.
3. °C°F appear simultaneously, to indicate the sensors’ attenuation in decibels.
4. Values larger than ±1999 or smaller than ±0.01 are displayed in powers of 10
±3
. As required,
either a “10
3
” or “10
-3
” will appear above and to the right of the displayed value, the value
will be rounded off to 3½ digits. The display will show RNG (out of ranGe), if the number to
be displayed is larger than 1,999,000. Twelve examples follow; for each the number and units
desired to be displayed are shown in italics, depicted immediately below them is the resultant
3½ digit LCD display:
3.4.3 Push Buttons
Four push buttons provide user control of the instrument. They are designated MODE, UP,
DOWN and PRESSURE CORRECT. These push buttons are vertically lined up on the upper left
side of the bare circuit board, with the MODE button on top. There is also a connector provided
which allows the use of external switches. The XDT-NEMA makes use of the circuit board
mounted push-button switches, to access them one must open the cover of the XDT-NEMA
enclosure. The XDT-PM is available in several versions:
• With a solid silk screened front face plate, which must be removed to access the circuit board
°C
DEWPOINT
°F
DEWPOINT
x10
3
PPM
DEWPOINT
LBS
DEWPOINT
DEWPOINT G/M
3
+20°C
-100°C
+68°F
-148°F
23,612 ppmV
0.013,849
ppmV
2,000,000
0.000,000,1
1104.2
lbs H
2
O/mmSCF
0.000,921,15
lbs H
2
O/mmSCF
17.688
grams H
2
O/meters
3
0.000,014,75
grams H
2
O/meters
3
°C
DEWPOINT
°F
DEWPOINT
x10
-3
PPM
DEWPOINT
x10
-3
LBS
DEWPOINT
x10
-3
DEWPOINT G/M
3