DH Instruments ADCS-601 - Setting a Head Correction; Stopping Pressure Control, Aborting Function Execution; Figure 30. ADCS Tools Pressure Exercise Definition Form

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ADCS-601™ OPERATION AND MAINTENANCE MANUAL

The <Dwell> is a wait time at the maximum pressure for each cycle. The <Control

Timeout> is the amount of time ADCS Tools will attempt to set a required pressure before

giving up and continuing if it is unsuccessful.

After defining the exercise routine, press [OK] to proceed with the exercise routine. To

interrupt the routine, use the [Abort] button on the Main Toolbar (see Section

4.3.3) or the

[Abort Control] button on the ADCS Run Screen Toolbar (see Section 4.3.5.3).

Figure 30. ADCS Tools pressure exercise definition form

4.2.6 SETTING A HEAD CORRECTION

ADCS-601 can automatically correct for the difference in height between the ADCS-601

reference level and the reference level of a device under test (DUT). The head correction,

adds or subtracts the pressure corresponding to a difference in height by calculating the

pressure head using the density of the test gas at the measured pressure.

The reference level of the ADCS-601 system is the reference level of the PG7601 piston

gauge which is marked on the front of the AMH automated mass handler vacuum chamber.

The difference in height between the ADCS-601 reference level and the DUT reference level,

is entered in the ADCS Control Panel <Head Correction> field. The value is positive if the

DUT reference level is higher than the ADCS reference level and negative if the DUT is lower

than the ADCS. The value is always entered in centimeters (cm).

4.2.7 STOPPING PRESSURE CONTROL, ABORTING FUNCTION

EXECUTION

To abort current pressure control, press the [Abort Control] button on the ADCS Run Screen

Toolbar (see Section 4.3.5.3). This causes the PPC3 pressure controller to stop actively

controlling and shut off from the system. To resume, a new target pressure must be entered.

To abort execution of a function (e.g. pressure standard change, measurement mode change,

FPG8601 validation, press the [Abort] on the ADCS Main Toolbar. This causes execution of the

function to stop. Nothing further occurs until a new instruction is given. The ADCS Main Toolbar

[Abort]

button is only available when a function that can be aborted is running.

Aborting execution of a measurement mode change may leave the system in an <Unknown

Measurement Mode> state. If this occurs, set a measurement mode (see Section 4.2.3)

before attempting any other operation.

The ADCS Main Toolbar has a [Pause] button. This button is to pause system operation.

To resume operation after pressing [Pause], press [Pause] again.