4.2.8 - ISOLATION
"Green field test" = Disconnect everything from the reader, except power. Move the reader to a remote location that has no electrical or RF
noise. Use a backup battery (12 volts, 7.5 ampere-hours, fully charged) instead of the DC power supply. Test using the test unit and test tags
from AWID's LR-TEK Installation Kit.
• Observe the reader's performance by itself Map the reader's effective RF- field by moving the tag slowly, side to side, -gradually
farther from the reader. Measure the maximum width of the field, and the farthest point where the tag reads. (This is the reader's read
range for that tag.)
• Reconnect the rest of the system, one component at a time. Observe the reader's performance at each step. What is it that makes the
problem re-appear?
Disconnect other devices near the problem reader. Observe performance of the LR-3000 reader by itself.
• Remove power temporarily from proximity card readers, communications gear, intercoms, telephone-access controllers, fluorescent
and other arc-type lamps, PCs and monitors, transformers, motors, etc., that are near the LR-3000.
• When the LR-3000 is connected directly to the system's panel, disconnect other readers that are connected to that panel.
4.2.9 - REPLACEMENTS AND SUBSTITUTIONS
Try a different reader in place of the problem reader:
• Is there a spare LR-3000 reader in your truck or at your shop? If so, use it in place of the original reader.
• Is there another LR-3000 reader, installed at this site, operating correctly? If so, interchange the two readers, and observe if the
malfunction moves with the reader or stays at the original location?
• Do you have a different kind of reader, like a proximity reader and a compatible card or tag? If so, wire it into the panel in place of the
LR-3000 reader. This may indicate a panel or system programming problem.
Do all tags give the same results? Try other tags and compare results.
Interface the LR-3000 reader to an access control system that has tested well previously with a different reader.
4.2.10 - ENVIRONMENT
Remove power temporarily from all other equipment near the reader that generates magnetic fields or electric fields.
• Look for communications antennas, PC monitors, arc-type lighting (including fluorescent), heavy electrical equipment (elevator
motors, air conditioners, etc.), RF-type telephone access panels, other RF-type readers (even 125 kHz proximity readers), high-voltage
60 Hz power lines, etc.
If the reader's cable to the system has a junction inside the gate-motor housing, try removing power from the gate motor for the reader
performance tests.
Shield the reader from possible RF noise sources:
• Form a large sheet of aluminum foil into a hemisphere around the reader's rear and edges, to block environmental RF interference.
Leave the aluminum foil open in front of the reader so that the reader can communicate with the test tags.
Remove power from other LR-3000 readers that are less than 8 feet from the tested reader if they are aimed parallel (as in neighboring lanes at
the gates), or less than 30 feet from the tested reader if they are aimed head-on toward the tested reader.
• Does the problem go away? Does the reader operate normally?
To see how the reader performs when it is removed from possible RF interference, do a "green field" test.
• Collect the LR-3000 reader, a back-up battery (or use your truck's battery), a tag, and the LR-Sounder. Carry them 5to a remote site
away from interfering devices. Test the reader's performance under these conditions.
To Next Page
Loading...