3-1
SECTION 3. TROUBLESHOOTING
Recommended equipment:
Volt/Ohm meter
CR10KD Keyboard Display
PC208 Datalogger Support software
Small screwdriver
When trouble shooting a problem with the
weather station, the system can be divided into
three sections: 1) Communication, 2) Sensors,
and 3) Datalogger. Determine what portion of
the system is failing by asking the following
questions:
1. Is the computer communicating with the
weather station?
YES -- go to question 2.
NO -- go to question 3.
2. Use TERM (PC208 software) to check the
sensor readings. Are the values shown in
TERM consistant with the bad readings
shown by the TORO software?
YES -- go to question 4.
NO -- If the values shown by TERM are within
normal limits, use TELCOM to collect recent
data. If these data are good, there is not a
problem with the weather station and the
communication link.
3. Connect the CR10KD to the weather
station (Section 3.3.1). Will The weather
station communicate with the CR10KD ?
YES -- A communication problem exists; go to
Section 3.1.
NO -- A datalogger or power supply problem
exists; continue with Section 3.3.
4. Is only one sensor giving a bad reading?
YES -- the problem is probably with the sensor.
a. Check sensor leads for damage or
corrosion. Also check leads at terminal strip of
datalogger to be sure that leads are securely
fastened.
b. Use circuit diagrams in Appendix and
Section 2.3 to ohm out defective sensor. Notify
your distributor should sensor need repairing or
replacing.
NO -- If multiple sensors are giving invalid
readings, the datalogger may be the cause.
The datalogger temperature and battery voltage
must be making reasonable measurements in
order for the datalogger to make proper sensor
measurements. Check out the datalogger as
described in Section 3.3. If the datalogger is
OK, Check out all sensors as described in
Section 3.2.
3.1 COMMUNICATION TESTING
3.1.1 TESTING SRM-6A RAD MODEM
COMMUNICATION, SYSTEMS SHIPPED
AFTER JANUARY 1 1991
The modem communication link is divided into
three sections: 1) SRM-6A RAD modem
(computer end), 2) cable from computer
modem to datalogger modem, and 3) SRM-6A
RAD modem with SC932 (datalogger end).
When unable to establish communication with
the weather station, test each of the three
sections.
Before proceeding through the testing
procedures, a terminal emulator software
program, such as "KERMIT", "PROCOMM", or
Campbell Scientific's "TERM" must be used to
communicate through the COM port of the
computer. Once the emulator program is set
up, testing can proceed as follows:
Modem at Computer Test
FIGURE 3.1-1 Rad Testing Computer End
Summary of Contents for NW8002
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