Ashcroft ATE-2 - Handheld Calibrator - Manual (Page 70)

68
NOTE: Cal Zero function must be performed prior to proceed-
ing to Cal Full Scale; Cal Zero & Cal Full Scale functions must
be performed prior to proceeding to Cal Linearity. The “Cal Full
Scale” & the “Cal Linearity” keys are activated only when this
sequence is observed. The “Apply New Cal” function can be
performed after each individual calibration steps (Zero, Full
Scale, Linearity) was completed.
4. Select “Cal Zero” and Press “ENTER”,
a.
The display will show target Zero pressure (00.00000).
Note: Min and Max allowable limits for all calibration pres-
sure values will be displayed below the target cardinal value.
If the pressure standard does not achieve exactly the target
cardinal pressure value, actual target pressure can be
edited within the Min and Max limits. This value is the pres-
sure reading which is displayed on the external pressure
calibration standard.
The following is defined as “Zero Pressure” for various
pressure types:
Absolute Absolute Zero (using vacuum pump)
Gauge Open to atmosphere (vent)
Compound Open to atmosphere (vent)
Differential Open both ports to atmosphere (vent)
Vacuum
Open to atmosphere (vent)
If the cardinal zero value cannot be achieved exactly by the
pressure standard:
b. Press left and RIGHT ARROWs to position cursor beneath
desired character
c. Press UP and DOWN ARROWs to increment numeric
characters
d. When the pressure value displayed on HHC matches value
displayed on pressure standard press ENTER
The display will read “Acquiring Cal Data…Wait while system
is busy”. After Zero Cal is complete (several seconds) the
screen returns to the Calibration Menu with “Cal Full Scale”
selected. At this time the operator can proceed with “Cal Full
Scale”, return to “Zero Cal” to repeat application of zero pres-
sure or save the Zero Cal by selecting “Apply new cal” and
pressing “ENTER”.
5. Select “Cal Full Scale” and press “ENTER”.
Pres Mod CH1 Cal
Cal Zero
Cal Full Scale
Cal Linearity
Apply new cal
Enter Mod Zero
00.00
^
Min -4.00 inH2O
Max 4.00 inH2O
Press Enter to cal
Ꮨƽ
Ꮨƽ
SECTION 15 o. PRESSURE MODULE CALIBRATION
CONT.