CR300-Series Datalogger
53
TABLE 9-1. Troubleshooting with Station Status
Panel Temperature
A panel temperature reading that is very high or very low can indicate
problems with sensors
Watchdog Errors
Watchdog errors indicate that the CR300 has crashed and reset itself.
This could be due to
• transient voltage
• a mis-wired or malfunctioning sensor
• a poor ground connection on the power supply
• running the CRBasic program very fast
• many PortSet() instructions back-to-back with no delay
• high-speed serial data on multiple ports with very large data
packets or bursts of data
If any of these are not the apparent cause, contact Campbell Scientific
for assistance. Causes that require assistance include the following:
• Memory corruption
• Operating System problem
• Hardware problem
Results for Last Program Compiled
Messages generated by the CR300 at program upload and as the
program runs are reported here. Warnings indicate that an expected
feature may not work, but the program will still operate. Errors
indicate that the program cannot run.
Skipped Scans
Skipped scans are caused when a program takes longer to process than
the scan rate allows. An occasional skipped scan can be caused by
memory formatting as discussed in Section 6.8, Memory
(p. 41). If any
scan skips repeatedly, the datalogger program may need to be
optimized or reduced.
Skipped Records
Skipped records usually occur because a scan is skipped. They indicate
that a record was not stored to the data table when it should have been.
Variable Out of Bounds
Variable-out-of-bounds errors happen when an array is not sized to the
demands of the program. The CR300 attempts to catch all out-of-
bounds errors at compile time and document the error. However, it is
not always possible, so these errors may occur during runtime.
Battery Voltage
If powering through USB, reported battery voltage should be 0 V. If
connecting to an external power source, battery voltage should be
reported at or near 12 V.
9.2 Basic Troubleshooting Procedure
The following basic procedure can be used if a system is not operating
properly.
1. With a voltmeter, check the voltage of the primary power source at the
CHG and BAT terminals on the face of the CR300. If powering through
USB, it should be in the 2 Vdc range. If connecting to a power source via
the BAT terminal, it should be 10 to 16 Vdc. If connecting to a power
source via the CHG terminals, voltage measured should be 16 to 32 Vdc.
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