Using The Product - TESTO 540 Instruction Manual

Using the product

To guarantee correct readings: Hold the instrument horizontally
so that the light sensor is directed upwards.
 Switching the instrument on:
Press .

- Measuring mode is opened.
 Switching the display light on:
 The instrument is switched on.
Press .

- The display light goes out automatically if no key is
pressed for 10 seconds.
 Changing the parameter unit:
Press until the desired unit appears.

Adjustable units
· lux
· ftc
 Changing the display view:
Adjustable views
· Current reading
· Hold: Readings are held.
· Max: Maximum values since the instrument was last switched on or last reset.
· Min: Minimum values since the instrument was last switched on or last reset.
 Press several times until the desired view appears.
 Resetting Max/Min values:
1 Press several times until the desired view appears.
2 Press and hold until
3 Repeat steps 1 and 2 for all values that are to be reset.
 Switching the instrument off:
Press and hold until the display goes out.

- - - -
appears.
Using the product 15