1. Clean this tube with a cotton bud on a long stick. Use each cotton bud once only, passing
it through from top to bottom, removing it through the bottom of the instrument. Repeat until no more dirt comes out.
2. Remove the drip tray and undo the transport clamp screw that was hidden under it. Use a screwdriver of the right size and turn anti-clockwise as far as you can. Replace the tray.
3. There is a bubble level at the rear of the balance. Adjust the two rear feet and the to set the instrument level.
4. Connect the handset and the mains adapter to the instrument back panel.
5. Connect to mains adapter to a power source.
6. Without any tube in the balance, switch on using the switch on the side of the handset.
Try the following simple tests.
7. Observe the display on the handset. It should first show a message like "v1.6.2" and then start its auto-zeroing procedure showing messages like "0.123E-5Z" (please note the first of these readings and the time it takes to first get to 0.000) which progressively get closer to "0.000E-5Z"
8. If the zeroing process completes OK then put in any empty sample tube. The display should change to something like "-0.003E-4V" (record this value) and should be steady. The "-" and the "E-4V" are essential, the other digits may vary.
9. Press the range button and the reading should change to, say, "-0.040E-5V" (record this value) and should be steady. Again, the digits may vary. Press range again for the rages E-6V and E-7V [note that the display will take a few seconds to show a value on the E-7V range] (record the values on these ranges also).
10. Remove the tube and check that the reading goes back to "x.xxxE-5Z" and soon becomes "0.000E-5Z".
Following these steps and returning the answers asked for will be most helpful in diagnosing the problem.
