vi. To change the display style, use the home button and touch the preferred
display style icon.
vii. The reading window will open in current mode and begin displaying
measurements in amps. Users can program their own settings to allow the
window to open with the preferred display.
viii. The display will darken after a few minutes of inactivity to conserve battery
power. Touching the screen will return the screen to full brightness based on the
brightness settings (see 15N & 15O to change display dimming/off settings).
3F. Quick Start –Common Problems:
The two most common causes of error are incorrect calibration factor use and improper
zero. It is a good practice to verify the correct calibration factor is in use before taking
measurements. It is equally as important to assure a proper zero has been performed.
3F1. Calibration Factor Verification.
Locate the calibration factor on the detector calibration certificate below the model
and serial number fields in the top third of the report.
i. From the home screen select settings, scroll to the second setting window
labeled Factor Number.
ii. Verify the sensitivity factor and factor units are correct. If not touch the selection
window and a scroll menu will appear, select a new channel until you find the
correct sensitivity factor as noted on your certificate (if you do not locate your
calibration factor and units from the certificate, go to 15B to learn about
adding/changing calibration factors)
Touch the back button to return to the home screen.
3F2. Zero:
There are two kinds of zero that can be used to improve accuracy. A dark zero is
used to remove small ambient noise caused from the environment. With the sensor
plugged in and covered with an opaque object, press the zero button. This reading
will be subtracted from all future readings to provide a zero reading. An ambient
zero is used to subtract small background light levels that are not coming from the
test source. With the test source off or blocked and the sensor exposed to the
environment/ambient light, press zero (an example of an ambient zero source is a
computer display that is needed during testing) Place the un-covered sensor in the
test location. Cover the test light source, or turn it off. Press Zero. The JEL-2400 will
take a measurement and subtract that value from all future readings until zero is
pressed again.
3G. Quick Start Feature Overview:
3G1. Display resolution:
The <-and ->buttons below the display will allow the user the control how many
digits are displayed i.e. 0.11 changes to 0.1111.
3G2. Display Units:
Toggles between the available fields; Current, Light Level, OD, and % Trans. To take
calibrated light level readings, press display units until Light Level is selected.
