In the Classroom

Procedures for cleaning and troubleshooting non-functioning Geigers

  1. Clean battery contacts using wire brush or sandpaper.
  2. Spray rotary selector (x 1, x 10, x 100) contacts with electronic contact cleaner  and rotate the selector several times.
  3. Notice the position of calibration pot(s) & rotate back and forth a couple of times. Reset to approximate starting position
  4. Loosen nuts holding wires onto the indicator meter and clean the flat contacts on the wires (using sandpaper or wire brush). Reattach wires.
  5. Insert batteries.
  6. Set selector dial to “x 10″. Observe meter
  7. Test the meter using source, looking for consistent reading.
  8. Compare reading using “x 100″ or “x 1″ (although “x 1″ setting will probably “pin the needle”)
  9. You may need to adjust the calibration pot(s) to assure readings which are suitable for demonstration purposes. REMEMBER you are NOT calibrating the meter – only making it usable for detection purposes.
  10. If the meter does not work, try replacing the Geiger tube with one known to be good and retest. If the meter works,  make sure to compare the “x 10 and x 1″ readings (adjusting calibration pots, if needed).

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