Setra-system Model 730 User Manual download pdf (Page 11)

5.0 Calibration & Adjustment

5. 1 Checking & Zero Adjustment

After installation on a system, the Model 730 should be zeroed. Figure 7

shows the location of the zero adjustment potentiometer.

Note: Before making adjustments be sure to allow the Model 730 to warm up and

pump down sufﬁciently to the system base pressure. This time will vary depending

on range and system conductance. A minimum of 15 minutes is suggested.

Use a digital voltmeter to view the signal output of the Model 730. Adjust the

signal output of the Model 730 to be 0.001 to –0.001 V. Make this adjustment

at a pressure at least 1/2 decade below the Model 730’s resolution; e.g., for a

10 Torr FS unit the zero pressure should be less than 5E-5 Torr. For a 1000 Torr

unit, a pressure less than 0.050 Torr is acceptable.

Figure 7 : Location of Calibration Adjustment Potentiometers

5. 2 Span (Full Scale) Adjustment and Calibration

The Zero adjustment is the only adjustment that should be made in the ﬁeld.

Span (Full Scale) adjustments require a calibrated and certiﬁed reference stan-

dard and should only be attempted by qualiﬁed personnel. Return the Model

730 to Setra Systems for periodic calibration, Span (Full Scale)

Adjustment and Calibration adjustments and servicing.

0.12

3.05

1.50

38.10

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Setra-system Model 730 User Manual Page 11