Davis Instruments 7852, Руководство по установке

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Extending Cable Runs
11
To calibrate your station for rounded millimeters, set the console to display rainfall in
millimeters and then change CAL to 0005. (See “Rainfall Calibration Number” on page 2
and/or your station user’s manual for instructions on how to change CAL.) Be aware that
the console will revert to its default calibration (i.e., 0.1") if it loses power.
If you want your station to display rainfall in tenths of a millimeter, you can “trick” it into
displaying in 0.2 mm increments. To “trick” the station, first display rainfall in
INCHES
and then enter a CAL value of 0005. To display rainfall thereafter, leave the unit of mea-
sure set to inches. Even though the display will show IN on the right hand side, the value
will actually be in millimeters. Please note, however, that if you do employ this “trick”
the maximum total rainfall will be 999.8 mm, rather than 9999 mm.
Troubleshooting Guide
Before calling Technical Support (1-510-732-7814), carefully check the following trou-
bleshooting guide. You may be able to solve the problem yourself.
•Rainfall is not registering on the console or the console has a large error. Try the follow-
ing:
• Check the cable connections from the sensor to the console. Cable connections
account for a large portion of the potential problems. Connections should be firmly
seated in the jacks and plugged in straight. If you think a connection may be faulty,
try jiggling the cable while looking at the display. If a reading appears intermittently
on the display as you jiggle the cable, the connection is faulty.
• Make sure there is no magnetic, steel, or iron object near the rain collector.
• Make sure the funnel hole in the cone is clear so water can empty into the bucket.
• Make sure the bucket moves freely when tipping to both sides . The console should
show an increase in rainfall for each tip of the bucket. (If the bucket does not move
at all, check that you have cut the cable tie that holds it in place during shipping.)
• Make sure the console is calibrated correctly by setting the console to your unit
preference before viewing or changing the CAL value (to 0100 for inches, to 0005
for millimeters). If this does not correct the problem, see “Calibration of Older
Model Weather Stations” on page 14 to determine if your station is an older model
station that warrants re-calibration.
• The console will revert to its default calibration if it loses power. You will need to
re-calibrate on power up if you have an older model station or a 0.2 mm rain collec-
tor.
•Rainfall amount shown on console has a small error.
• Make sure the rain collector is mounted on a level surface. Use the adjustment
screws (see “Adjusting the Rain Collector II” on page 11) to adjust the rain collec-
tor’s sensitivity, if necessary.
• If you believe the rain collector to be installed and calibrated correctly and you still
detect a small error, you can tweak the console’s calibration. Use the rainfall cali-
bration equation on page 3 to adjust the calibration number. (Note: Tweaking will
only work with the 0.01" rain collector; the calibration number for millimeters (5) is
too small to be tweaked precisely.)