Foss Infratec 1241, Руководство по обслуживанию

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Infratec™ 1241 Grain Analyzer
4:18 Service Manual 1001 5015 / Rev. 4
Checksum test of detector EEPROM
This test validates the serial number and gain settings. If the checksum does not
match what is stored in the EEPROM, an error occur and the instrument disables
analysis
.
Air stability
This test checks the stability of the air reference scans after power-up.
The test checks the level of the reference scan and reports test “Failed” if it is outside
limits (15000
<
Max level<65280). If the test fails due to the reference scan limits, the
result will only show one row displaying the ADC level.
The difference between two succeeding groups of 6 scans are calculated and should
not exceed the limit 100. The first rows indicate the level of the reference scan at the
start of the test, because the first differences are calculated against a zero value. If the
difference is >100 another group of 6 scans are calculated against the previous group
and again the difference should be below 100. There is always a 10 second delay be-
tween the groups. This continues until the difference is less than 100 or a time limit
of 20 minutes is reached. The minimum number of steps is 13.
* Level of reference scan, calculated against zero vector.
Monochromator Wavelength Stability
Wavelength stability is measured by calculating the 2
nd
absorbency peak from the in-
ternal BG20 filter. Measurements are made on ten subsamples.
The mean value of the peaks is then compared to the one stored in the monochroma-
tor EEPROM. The mean, maximum, minimum, standard deviation and difference are
displayed on the screen. The difference between the measured wavelength and the
stored wavelength is presented as Peak
2
Diff. The maximum limit is +/- 1nm (one),
if the value is outside the limits, an error message is created.
Line description including typical value Units
Min.
limit Max.
limit
SelfTest/1241xxxx/Detector /Checksum=Bool, True bool
Line description including typical value Units Min. Max.
SelfTest/1241xxxx/Stability/1/MaxDiff=Number, 56532 bits 15000 65280*
SelfTest/1241xxxx/Stability/1/MaxDiff=Number, 56512 bits 15000 65280
...more bits 15000 65280
SelfTest/1241xxxx/Stability/2/MaxDiff=Number, 450 bits 100
SelfTest/1241xxxx/Stability/3/MaxDiff=Number, 225 bits 100
SelfTest/1241xxxx/Stability/4/MaxDiff=Number, 120 bits 100
SelfTest/1241xxxx/Stability/5/MaxDiff=Number, 90 bits 100
Line description including typical value Units Min. Max.
SelfTest/1241xxxx/Monoch. /SerialNumber=String, T9010017
SelfTest/1241xxxx/Monoch. /I/Peak2Mean=Number, 879.82 real
SelfTest/1241xxxx/Monoch. /I/Peak2Min=Number, 879.61 real
SelfTest/1241xxxx/Monoch. /I/Peak2Max=Number, 879.90 real
SelfTest/1241xxxx/Monoch. /I/Peak2Std=Number, 0.02 real -1nm +1nm
SelfTest/1241xxxx/Monoch. /I/Peak2Diff=Number, 0.07 real -1nm +1nm