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Rva
RCSTATUS.doc
Interpretation of STATUS response.
Filter:
Chopper speed:
Lamp intensity:
Gains:
Bottom values:
Blank values:
Number of currently selected filter, 1 ..8
Chopper rotation speed in revs per minute, should be
1430..1480
Lamp intensity for currently selected filter, slit off
I
slit on.
The lowest intensity is 0, the highest 3.
Measure channel gains for currently selected filter,
slit off
1
slit on.
The channels are in order from 1 to 8.
The lowest gain is 0, the highest 7.
Dark levels of channels 1 ..8. The values are sum of two
AD readings
Light levels of channels 1 ..8. The values are sum of two
AD readings.
Bottom values and Blank values can be converted to input voltage of the
AD
converter by dividing them by 81 9. The exact formula is: value 181 90
*
Vref.
Because the bottom levels and blank levels depend on selected filter and
lamp intensity no absolute limits can be given. The following suggestive limits
may be used:
The bottom level at the AD wnverter should be 90 to 11OmV with filter
2
(
=
405nm
).
This corresponds to bottom value 73 to 90. This applies to the
channel with the lowest reading. Other channels should be less than i50mV
I
reading 123.
Tha blank levels at the AD converter should be 5.0 to 9.8 V
(
3.3
to 9.8 V with
software version
1.5-0
onwards
).
This corresponds to readings 4095 to
8026
(
2703
to 8026 with software version
1.5-0
onwards
).
The less
deviation between the channels the better.
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