3.
USING THE INSTRUMENT IN FIXED CHANNEL MODE
3.1 OVERVIEW
Fixed channel mode provides perhaps the most straight forward operation
but with a lower accuracy than custom channel mode. In this mode it is not
necessary to set up any values in the instrument other than probe calibration
as described in 2.13.
In use, a channel is chosen that gives a reading as close as possible to the
actual value of the known sample. This channel is then used to measure all
subsequent samples of that lacquer type.
All operations in fixed channel mode except probe calibration and channel
calibration take place with the MEASURE indicator illuminated.
3.2 SELECTING THE CHANNEL
To find the most suitable channel the known sample is placed in (or under)
the probe and the reading noted. (do not forget to clip the crocodile clip to
the substrate of the sample).
If the displayed reading is below the actual value of the sample press the up
arrow key to increase the channel number as indicated by the lacquer
number display until the nearest reading is found.
If the displayed reading is above the actual value of the sample press the
down arrow key until the closest reading is found.
When the closest reading has been found the channel or lacquer number as
indicated is the channel that should be used for all measurements on that
particular lacquer types.
3.3 CALIBRATING THE CHANNELS
In fixed channel mode the instrument is calibrated against a stable internal
reference. Whilst in MEASURE mode press
CALIBRATE
. The instrument
will automatically select the internal reference, select channel 25 (this gives
the best accuracy) and calibrate the instrument. All channels will be
calibrated simultaneously.
Summary of Contents for SI9500
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