Setup Scanner Thresholds; Threshold Adjustment (Width Calibration) - BCID Bio-Science CI-203 Operation Manual

Setup Scanner Thresholds

NOTE: Normally, there is no need to adjust the threshold of the CI-203 because the instruments
are factory-adjusted to a threshold level that is ideal for "all-around" use.
The CI-203 automatically adjusts an internal threshold to a level that is optimum for detecting the
presence of a leaf in the scanner objective. If out-of-the-ordinary measurements are being recorded
or if the instrument has suffered from abuse or excessive aging, the manual threshold setting may
need to be adjusted. If the instrument appears to be making incorrect measurements, make sure the
instrument is clean and the reflective tape and the objective window appears to be undamaged and in
good condition. If there is something blocking the optical path in the scanner, no amount of threshold
adjustment will correct the problem. Refer to the section on cleaning and maintenance for more
information on insuring that the instrument is clean. Please do not hesitate to consult with the
manufacturer or with the nearest manufacturer's representative if there is a problem and the
threshold needs adjustment.
Use the UP/DOWN arrow to highlight Scanner on the Setup Menu display. Next, press the RIGHT
arrow to enter the Setup Scanner menu. The options on the Setup Scanner menu include HiThld
(High Threshold), LoThld (Low Threshold), Manual, Filter and Adjustment. Use the UP/DOWN key to
switch between options and the RIGHT arrow to select.

Threshold Adjustment (Width Calibration)

In the event you need to alter the normal threshold settings, perform the following steps. First, check
the threshold of the CI-203 alone, with its arm in place. To do so, access the Setup Scanner menu,
select "HiThld" and press the RIGHT arrow key. The instrument's motor will turn on and a "t" and "w"
value will appear and count down on the display. Next, the display will show the high threshold value
briefly before returning to the Scanner Setup menu. Make note of the HiThld value.
Next, switch to "LoThld" menu and place a piece of white paper under the arm and press the RIGHT
arrow key. Let the scanner run. The display will show a t value that counts down and w=0. When the
t value is done counting down, the final Low Threshold value (t= ) will display briefly before exiting
back to the Scanner Setup menu. Make note of the LoThld value.
Remove the paper from under the arm. Next, select 'Manual' from the Scanner Setup menu by
pressing the RIGHT arrow key. Make sure that the width reads 0 when there is no object under the
arm. Stop the Manual scan and the motor by pressing the STOP key. On the scanner menu, scroll
down to 'Adjustment'. Here is where the user can adjust the width measurement based on the high
and low threshold values. After increasing or decreasing the Manual threshold value, press STOP.
You will be prompted to STOP (discard changes) or SAVE changes if you made any.
The next step is very important: every time the threshold is changed in any mode, switch to the
"Measure" menu and press the LEFT and RIGHT key at the same time. The instrument will
automatically compute and save the timing parameters. The user should repeat this computation a
few times allowing the instrument to generate an accurate leaf width reading. Make sure to check the
width reading with and without the filter. When checking the reading without the filter, the width
should be above 0 but still a very small value.
1554 NE 3 Ave, Camas, WA 98607, USA
rd
Phone (360) 833-8835 Fax (360) 833-1914
t = 76 w = 0
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sales@cid-inc.com http://www.cid-inc.com
CI-203 Instruction Manual rev. 8/9/2016
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