Chapter 7 Service
Mini-Switch LB 471
7.3 Check Measurement with Test Generator
You can use the test generator in code 60 to check the calibration
of the measurement. The test generator simulates the probe and is
enabled by entering a digit larger than 0.
It is advisable to simulate the empty count rate (code 20) as well
as the full count rate (code 21) with the test generator. Correct
switching of the alarm relay can be checked and the reading can
be presented on the display.
If the test generator is turned on:
the device acts as if the count rate were coming from the de-
tector.
the counts from the detector will be ignored.
the error relay is enabled to indicate that the readings do no
longer correspond to the level any more.
For the limit switch to continue working normally, you have to turn
off the test generator after the test.
To be on the safe side, the test generator will be turned off auto-
matically after 20 minutes.
The test generator is also disabled if the limit switch is locked by
entering the password.
We recommend documenting all settings in the start-up protocol
on the following pages.
7.4 Plateau Measurement
Plateau measurements are carried out to check the detector in
case of error (only for NaI detector with NaI crystal-multiplier
combination).
The function is started with code 68.
See also the section „Checking the Crystal-Multiplier Combination“
in the hardware manual.
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