• Visual control regarding damages on the outside of the instrument.


• Check the plug connections. They have to be non-corrosive and dry.


• The membrane keyboards may not be damaged.


• Plug in the AC adapter to a 230V power socket and connect it with the WS 05 C. Then, connect the probe and optionally the door switch and the external alarm lamp.


• Turn the instrument on. Each measuring channel will pass a self test for approx. 2 seconds. During this test all segments of the LC display will be triggered. At the same time the acoustic alarm must be activated (door open). The red LED and the alarm light have to light up.

Test of the WS 05 C with probes at ambient radiation:

When using the probes 18550 CE / DE ad 18545 CE / DE ambient radiation will trigger a dose rate value. This value will oscillate between approx. 30 nSv/h and 300 nSv/h, as the ambient radiation is no constant value.

As the probes 18509 CE / DE and 18 529 CE / DE are designed for the measurement of higher dose rates, they will indicate 0 µSv/h when exposed to ambient radiation. Therefore, a functional test of has to be effected indirectly by using the dose display. For this, turn the measuring channel off and on again. Operate the channel with a connected probe for one hour. Now, press the button "dose" and a value of approx. 50 - 300 nSv with the corresponding integration time will be displayed.

Additional measurements exceeding the ambient background radiation:

For this, a radioactive test source (e. g. GRAETZ "PS 9") is needed. Generally, ¹³⁷Cs with an activity of 333 kBq is used. The half life of Caesium is 30 years. At first, programme a dose rate alarm threshold to 50 µSv/h. Put the test source onto the marking of the probe, indicating the middle of the GM-tube. The WS 05 C has to show a measuring value of approx. 70 µSv/h and an optical and acoustical alarm will be triggered (only valid, when the WS 05 C is operated without door switch function).

Optionally test of the door switch function: The door of the monitored room is open and a triggered alarm threshold must activate an acoustical alarm signal. In case of a closed door there will be only an optical alarm.