Campbell Scientific CSAT3B CSAT3B Three-Dimensional Sonic Anemometer - Page 64

CSAT3B Three-Dimensional Sonic Anemometer TABLE 8-5. Diagnostic Word Flags Bit # 3 4 5 6 7 8 Hex Value 0x0008 0x0010 0x0020 0x0040 0x0080 0x0100 Decimal Value 8 16 32 64 128 256 Flag Name High Delta C Acquiring Low Voltage Trigger Error Internal Humidity Warning Memory Error Description Difference in the speed of sound between the three non-orthogonal axes is greater than 2.360 m·s-1 (~4 °C @ 25 °C) Indicates that the anemometer is trying to acquire the sonic signal The supply voltage to the anemometer is below 9.0 Vdc A measurement trigger has not been received for at least 1 sec, or the time interval between triggers is varying by greater than 5% The relative humidity inside the CSAT3B block is greater than 80% There is a signature mismatch from the calibration file or another section of memory Troubleshooting The anemometer path length may have been altered or the anemometer head is structurally damaged There may be an obstruction in the anemometer path or on the transducer face or a transducer has failed Check the power supply Check wiring to the datalogger, and check the datalogger program for the expected trigger rate Change the internal desiccant canister (see Section 9.3, Desiccant) 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. 54