Campbell-scientific CS110 Electric Field Meter Bedienungsanleitung PDF herunterladen (Seite 59)

Appendix D. Servicing the CS110

D.5 Shutter/Encoder Alignment

A factory trim is done to align the position of the CS110 shutter with an Index

mark on the rotary position encoder. Re-trimming of the shutter/encoder

alignment becomes necessary after encoder disassembly. The procedure to trim

the shutter/encoder alignment uses a CS110 single-step trim instruction called

CS110Trim. This instruction allows a single shutter step open (flag 1) and

closed (flag 2) utilizing the flag capability in LoggerNet. The following CS110

program listing (CS110_Index_Trim.cr1) is for trimming the Index mark to the

fully closed shutter position.

'CS110 program to trim index to fully closed shutter position (CS110_Index_Trim.cr1).

' Index/shutter trim procedure follows:

' 1. Take at least 8 full-steps open via flag(1) in order to synchronize

' motor coils with motor controller phase state.

' 2. Open shutter to the fully opened position via flag(1) and flag(2).

' 3. Utilizing flag(3) drop into scan that fully closes shutter with 25 full steps.

' 4. Monitor index output on o-scope or voltmeter and trim encoder adjustment so that

' Index = 5 V in fully closed position.

' 5. Take a step open (flag(1)) and then closed (flag(2)) and verify park on Index.

' Updated last by Jody Swenson on 7/15/04.

Public Flag(3)

Public I

Public Battery

Public Panel_Temp

BeginProg

Scan(10,msec,0,0)

If Flag(1) Then

CS110Trim(1) 'Take a step open.

Flag(1) = 0 'Reset Flag 1.

EndIf

If Flag(2) Then

CS110Trim(-1) 'Take a step closed.

Flag(2) = 0 'Reset Flag 2.

EndIf

If Flag(3) Then 'Exit scan via Flag 3.

Flag(3) = 0

ExitScan

EndIf

NextScan

Scan(1000,msec,0,0)

For I = 1 To 25 'Loop to fully close a fully opened shutter.

CS110Trim(-1) 'Take a step closed.

Delay (0,10,mSec)

Next I

ExitScan

NextScan

Scan(10,msec,0,0)

If Flag(1) Then

CS110Trim(1) 'Take a step open.

Flag(1) = 0 'Reset Flag 1.

D-3

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