Infratec™ 1241 Grain Analyzer
4:22 Service Manual 1001 5015 / Rev. 4
4.4.2 Monochromator
Fig. 4:9 Monochromator Tests
Grating System
Identical to the "Grating System" test carried out in the Self-test routine.
Air Stability
Almost identical to the "Air stability test" test carried out in the Self test routine, with
one exception: This test has an option to break the test by using the Stop function that
makes it possible to go on measuring stability after the test has passed. On the screen
the maximum difference values are shown together with the incremental values and
the scan peak value.
Shutter
The Shutter test consists of two parts: The first is checking the repeatability of the
shutter positioning and the second is measuring the light leakage.
For the shutter repeatability positioning, a reference scan is taken with the lamp on
and shutter open. A new scan is taken after the shutter is closed. Then a third scan
after the shutter is reopened again. The difference between the first and third scan has
to be below limit. Failure can be viewed on screen and logged to Error log.
For the Light Leakage test the shutter is now closed again and a fourth scan is taken.
The second and fourth scans must also be within limits.
The max. and min. levels of the second and fourth scans must also be within limits.
The lamp is then turned off (shutter still closed) and a fifth scan is taken. The differ
-
ence between the fourth and fifth scan must be within limits. Failure can be viewed
on screen and logged to Error log.
Internal BG20
Identical to the "Monochromator Wavelength Stability" test carried out in the Self-
test routine.
The same limits are used.
External BG20
With this test it is possible to compare one master BG20 filter with the results from
the internal BG20 filter test. Insert a permanent sample with a BG20 glass filter in
Line description including typical value Units Min. Max.
SelfTest/1241xxxx/Monoch./SerialNumber=String, T9010017
SelfTest/1241xxxx/Monoch./Ref/Max=Number, 56532 bits
SelfTest/1241xxxx/Monoch./ShutterOpen/Diff=Number, 10 bits -100 100
SelfTest/1241xxxx/Monoch./ShutterClosed/Diff=Number, 15 bits -100 100
SelfTest/1241xxxx/Monoch./ShutterClosed/Level=Number, 510 bits 50 2000
SelfTest/1241xxxx/Monoch./ShutterLeakage/Diff=Number, 15 bits -100 100
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