SADP_Operating_ Instructions_0114
11 Electrical Function Check
If there is any doubt about the functioning of the Analyser, the following test may be carried out.
(This must always be carried out in the Safe Area)
1.
Switch the instrument off.
2.
Check that the meter reading is accurately at the zero (left-hand) end of the scale.
If not, adjust the reading by means of the plastic screw on the meter face.
3.
Remove the instrument head by taking out the 3 screws in the base flange, and disconnect the
sensor by pulling out the coaxial plug.
4.
Switch instrument to the Battery Check position to confirm that the batteries are in good condition
(replace them if they are not), and then select the read position
(the standard range on extended range models).
5.
Apply a short circuit to the sensor cable plug on the instrument - the voltage is extremely low and
so there is no hazard.
6.
Adjust the Automatic Calibration control to give a reading of full scale. (i.e. on the Automatic
Calibration line).
7.
Remove the short circuit and the reading should return to the left-hand end of the scale. This
establishes that there is no major fault in the instrument. If the tests so far do not produce the
expected results, the instrument should be returned to your local dealer.
8.
Apply a load of 8.6k
Ω
to the sensor cable plug. Readjust the reading to full scale, using the
Automatic Calibration Control.
9.
Increase the load to 18.6k
Ω
. The reading should decrease to 62% of scale ±1%.
10. Increase the load to 62k
Ω
. The reading should decrease to 23.5% of scale with the same
tolerance as above.
11.
Refit the head assembly, and carry out the Automatic Calibration procedure.
This Completes The Electrical Function Check
N.B. Please note that VP1 on the printed circuit board is factory set. If the adjustment of this
control is altered, it will be necessary to return the instrument to our works.
