Communication problem with the data logger
- Is there a chance the logger could have been submerged since your last visit?
- Is the communication cable damaged?
- Is the software up to date?
- Is the firmware up to date?
- Are the USB drivers up to date?
- Have you got the correct com port selected?
- Is the correct product logo selected on the software home screen?
I can connect to the Datalogger but can’t download data
This is most likely to be an issue with either the USB cable or a problem on the logger itself. If you have access to another laptop and/or USB cable, it is best to try this first before contacting Geosense for more options. There are ways to extract data from the logger when these problems occur however these methods should only be carried out with the assistance of a member of Technical Support at Geosense or RST Instruments.
What are “B units”
The DT2055 works with a raw Vibrating Wire output unit of Hz2/1000. This is known as B units and is also the same units which Geosense Vibrating Wire sensor calibration sheets are provided in. When doing any calculations to convert into Engineering units, these are the figures that are used.
Below are some examples of strange readings you may encounter when you download the data from your datalogger:
- Strange date/time stamp
- Unlikely frequency readings
- Unlikely engineering units
- Unlikely temperature readings
It is important to check the current software and firmware version of the datalogger that is showing a problem before worrying further. Out of date firmware and software can have quite a significant impact on the output file you receive from the datalogger.
If the problem remains after double checking the software/firmware version, then this could be related to a programming issue or something a bit more hardware related such as cut cables or sensor damage.
Negative Values in Engineering Units
Should these values look almost inverted to what they should be, then there is likely to be an issue with the calibration factor used in the “Sensors” tab. It can be a little misleading as Geosense calibration sheets state a linear calculation of “Current Reading” – “Site Zero reading”. The RST Multichannel Logger software works on an opposite convention being “Site Zero” (or “Ro”) – “Current Reading” (or “R”). This can easily be overlooked during programming.
Temperature reading of -30°C or less
Unless you are actually expecting this temperature, this indicates that there is either a wiring issue with the Thermistor into the logger or that the cable is damaged. If you are getting a VW signal from the same cable then it is more likely to be a wiring issue. This should be checked and re-wired.
B unit reading of “99999”
This indicates there is an issue with wiring and/or cable damage. As above, if you are getting a sensible Temperature value from the same sensor giving strange B units, then it is more likely to be a wiring issue. What must also be checked is the Sweep range selected for that sensor. This can be found in the “Sensors” tab. Please consult your calibration sheet for that sensor to determine what sweep range is best for your sensor.