Campbell CSAT3B, Инструкция по эксплуатации, Страница: 64 / 88

CSAT3B Three-Dimensional Sonic Anemometer
TABLE 8-5. Diagnostic Word Flags
Bit #
Hex
Value
Decimal
Value Flag Name Description Troubleshooting
3 0x0008 8 High Delta C
Difference in the speed of
sound between the three
non-orthogonal axes is
greater than 2.360 m·s
-1
(~4 °C @ 25 °C)
The anemometer path length
may have been altered or the
anemometer head is
structurally damaged
4 0x0010 16 Acquiring
Indicates that the
anemometer is trying to
acquire the sonic signal
There may be an obstruction in
the anemometer path or on the
transducer face or a transducer
has failed
5 0x0020 32 Low Voltage
The supply voltage to the
anemometer is below 9.0
Vdc
Check the power supply
6 0x0040 64 Trigger Error
A measurement trigger has
not been received for at
least 1 sec, or the time
interval between triggers is
varying by greater than 5%
Check wiring to the
datalogger, and check the
datalogger program for the
expected trigger rate
7 0x0080 128
Internal
Humidity
Warning
The relative humidity
inside the CSAT3B block
is greater than 80%
Change the internal desiccant
canister (see Section 9.3,
Desiccant
)
8 0x0100 256 Memory Error
There is a signature
mismatch from the
calibration file or another
section of memory
Resend an OS and/or cal file to
the CSAT3B; contact
Campbell Scientific for details
8.4.3 SDMTrigger()
The SDMTrigger() is an SDM Input/Output instruction that controls SDM
devices that support the group trigger protocol, including the CSAT3B. Up to
15 group-trigger devices can be connected to the SDM bus. All group-trigger
devices are triggered for simultaneous measurements with the SDMTrigger.
The data from each device is retrieved with the appropriate device-specific
instruction.
The SDMTrigger() instruction is unnecessary when using CPI
communications because group triggering is integrated and enabled into the
CPI protocol. Multiple CPI devices will inherently be synchronized.
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