The HP-28C and HP-28S have built in internal, display, and keyboard test functions.A continuous internal/display test is performed by simultaneously pressing the ON key and the left-arrow key (labeled "E" in the illustration at the right). Various internal and display tests will be performed until interrupted by simultaneously pressing the up-arrow key (labeled "C" in the illustration at the right) and the ON key.The more thorough internal/display/keyboard test is performed by pressing the ON key and the down-arrow key (labeled "D" in the illustration at the right). Press any key to step through the various display and internal tests until "KEYBOARD TEST" is displayed. Starting with the left keyboard, in order press each key from left to right on each row, from the top row to the bottom row. Then proceed to press each key on the right keyboard in order from left to right and top to bottom. If the test is successful, "OK" followed by the model number will be displayed. If a key is pressed out of order or there is a keyboard problem, and error message will be displayed. This test can be interupted at any time as described above.
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Survey Photos by Tag or CategoryEarth's Largest Survey Photos Collection
Since 2007, Land Surveyors around the world have shared their best Surveying Photos from the field. Inside this collection you can transport yourself to virtually any location on Earth and see how Land Surveyors work, types of equipment being used and environmental challenges associates with being a land surveyor in that location.
Location Based Chapter Hubs also have photos specific to the locations they represent. You can use our Surveyor Apps for quick sharing of your photos from the field.
Note: Members who have uploaded their photos of surveying to this collection can also move their photos to location based hubs. To see how, follow this tutorial.
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