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Get the most recent version of Asset Surveyor™ for the TDC-1 Here are a few questions and answers to help you use your datalogger. Q. I notice that when I'm using my ProXR with TDC-1 on a hot day, the screen of my datalogger gets darker and darker, until it goes completely black. What can I do to prevent that? A. The display screen is an LCD (liquid crystal display). The longer the sun hits the screen, the darker the screen gets. We strongly recommend that you take care to protect the screen from direct sunlight. You can let the datalogger rest at your side while logging a line or area feature, rather than facing the sun. Make sure that when you set the unit down (i.e. during lunch) to put the unit face down or in the case. Certainly it is impossible to always shield the screen from direct sunlight, but if you take care to do so, you can continue working in the hottest of days. Also, don't forget that you can control the screen contrast. Press Function (FUNC key) and right-arrow to darken, and Function and left-arrow to lighten the screen. Q. I keep getting this warning saying, "The internal backup batteries are dead." I just replaced the 9-volt batteries. Why do I get this warning? A. There are 3 different battery types in the ProXR/XRS with TDC-1. The 9-volt batteries are Internal. The small, lithium cells are Internal Backup. The large, sealed, lead acid batteries in the yellow pack are called External. The 9-volt batteries are responsible for powering the TDC-1. When those batteries die, the datalogger is running on the small, lithium cells only. Replace the 9-volt batteries immediately. If you do not, you will deplete the lithium cells very quickly. If you lose both your 9-volt and lithium cells, you will lose all your field data, you data dictionary, and your configuration setup. The lithium cells are intended to provide backup power for collected field data until you can replace the 9-volt batteries. When replacing the lithium cells, make sure to surround the body of the battery with tape or other covering so you can easily retrieve them when they require replacement again. Note that the battery compartment is recessed and very small, making the batteries difficult to extract.
Always use a high-quality, Alkaline 9-volt cell. Some inexpensive 9-volt batteries are slightly shorter than the major brands. This smaller battery has been known to interrupt power to the datalogger while in the field by not making full contact with the battery terminals inside the unit. Recommended brands are Eveready, Duracell, Kodak, and Radio Shack. Rule of Thumb: if you've never heard of the battery, don't use it. All 3 battery types are available at Radio Shack for a very reasonable fee. Tip: always carry an extra set of 9-volt batteries while in the field.
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Lithium cell