TB 9-6660-270-50
(3) Draw 2 lines parallel to the x-axis with ordinates corresponding to the
appropriate tolerance listed in table 1.
(4) Analyze the graph and make zero adjustments as required to bring all points
between the parallel lines. Make zero adjustment with TI at ambient pressure (R).
9. Repeatability (ML-102( ), ML-332/TM, and ML-333/TM only)
a. Performance Check
(2) Adjust vacuum regulator (B6) for a 900-millibar indication on TI.
Record
indication on barometer (A1).
(3) Adjust vacuum regulator for a 800-millibar indication on TI.
(4) Turn off vacuum pump (B5) and slowly vent TI until TI again indicates 900
millibars.
(5) Barometer will indicate the value recorded in (2) above within the limits
b. Adjustments. No adjustments can be made.
Table 4. Barometer Accuracy, ML-102( ), ML-332/TM, and ML-333/TM
Test instrument indications
Barometer indications
(mbar)
(mm Hg)
ML-102 ( )
ML-332/TM
ML-333/TM
Min
Max
---
---
540
403
406
---
---
690
516
519
---
745
---
557.5
559.9
750
---
---
561.4
563.8
765
765
765
572.5
574.9
780
780
780
583.8
586.2
815
815
815
610.0
612.4
850
850
850
636
638
875
875
875
655
657
900
900
900
674
676
925
925
925
693.3
694.2
965
965
965
723.3
724.2
1000
1000
1000
749.6
750.5
---
---
1030
772.1
773.0
1040
1040
---
779.6
780.5
10601
---
---
794.6
795.5
1Beyond
the range of some modified barometers.
7