Meriam M203 Altimeter Indicated Air Speed Tester - Manual (Page 8)

5
1. To zero the manometer using Referenced to Absolute Zero,
start with the unit turned OFF and use the following keystroke
sequence:
Keystroke Display
1. Press ON/OFF button.
2. Connect the M203 to a
vacuum source capable of 100
microns absolute or less.
3. Pull a full vacuum
The display briefly shows
the header name and full
scale range in the last
engineering units selected.
The manometer then goes
into the Measure Mode
showing the pressure and
engineering unit.
Display should read close
to zero. (See note on next
page)
4. Press MIN/MAX and TARE
keys at the same time. (See
Figure 1 below.) Top line of display reads
“ZEROING SOURCE:”
Bottom line of display
reads “REF TO ABS ZERO”
5. Press the PGRM key. Top line of display reads
“ZERO IN PROGRESS”
while bottom line counts
down from 9. Zeroing is
complete when unit returns
to Measure Mode.
Figure 1 NOTE: The M203 can be zeroed only if
the new applied zero is within ˜ 1% FS
of the original factory calibration zero.
If outside this limit a “ZERO RANGE
ERROR” message appears and the
manometer will not zero. Contact the
factory for support in this case.