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14. Feature Buttons:
14A. Display Units:
Toggles between the available fields;
Current
(output is in amps).
Optical Density:
compares the incoming signal
to the saved 100% reading to provide an OD
between 1 and 4.
Transmission:
compares the incoming signal to
the saved 100% reading to provide a reading of
% transmission.
Light Level:
converts the incoming current from
the sensor to calibrated readings in appropriate
units such as lux, fc, W/cm2, Watts etc. Based
on the user selected calibration factor (see 15B
for selecting calibration factors and 15Q for
adding/programming calibration factors).
14B. Zero:
Takes a reading in amps and subtracts that current value from all future readings. Any
value below the stored value will be shown as a Zero reading. When measuring small
light or current levels, it is a good practice to zero in the environment of the testing and
perform period zero validation or re-zero when the conditions in the environment
fluctuate (temperature, noise, ambient lighting).
14C. Integrate:
Is used to measure dosage or exposure. When toggled on, the JEL-2400 will take the
present reading and add it to the previous value, once per second, creating a sum of
light measurements over time. When in integrate mode the units of the readings change
to include *seconds. For example, Lux becomes lux*seconds, W/cm2 becomes
W/cm2*seconds or J/cm2, W/m2 becomes J/m2.
14D. Hold:
Freezes the value on the numerical display to allow manual recording
(does not apply to
graph)
14E. Min/Max:
Toggles the numerical display to only record a value that is:
Min: less than the existing value on the display.
Max: greater than the existing value on the display.
14E.1 Min/Max:
Also doubles as a
Peak FW
button. Peak FW is similar to Max, except it pushes the
limits of the system’s rapid measurement capability and uses the firmware speed to
scan for changes that occur very fast.
14F. 100%:
Records the baseline value for 100%. This does not impact the display. To readout in
percentage you must use the Display Units button to select percentage.