TESTO 540 How to use

Short manual testo 540 11
Short manual testo 540
Protection cap: Park position
Light sensor
Display
Control keys
Battery compartment (on rear)
Basic settings
Instrument off > press and hold 2s > select with ( ),
confirm with ( ):
Auto off function: OFF,ON
Switching the instrument on
Press .
Switching the display light on (for 10s)
Instrument on > press
Select display size
Instrument on > select with :
lux, ftc
Select display mode
Instrument on > select with :
Current reading > Hold: Readings are held > Max: Maximum values > Min: Minimum
values
Switching the instrument off:
Instrument on >press and hold 2s.

Safety and the environment12
Safety and the environment
About this document
· Please read this documentation through carefully and
familiarise yourself with the product before putting it to use.
Keep this document to hand so that you can refer to it when
necessary. Hand this documentation on to any subsequent
users of the product.
· Pay particular attention to information emphasised by the
following symbols:
Important.
Avoid personal injury/damage to equipment
·Only operate the measuring instrument properly, for its
intended purpose and within the parameters specified in the
technical data. Do not use force.
·Never store the product together with solvents, acids or other
aggressive substances.
·Only carry out the maintenance and repair work that is
described in the documentation. Follow the prescribed steps
when doing so. Use only OEM spare parts from Testo.
Protecting the environment
·Take faulty rechargeable batteries as well as spent batteries to
the collection points provided for them.
·Send the product back to Testo at the end of its useful life. We
will ensure that it is disposed of in an environmentally friendly
manner.

Specifications 13
Specifications
Functions and use
The testo 540 is an illuminance measuring instrument. It is
normally used to measure illuminance, e.g. at workplaces.
Technical data
Measurement data
· Sensor:
Photo diode
· Parameters:
Lux (lm/m2), foot candle (lm/ft2)
· Measuring ranges:
0...99999 Lux, 0...9300 ftc
· Resolutions:
1 Lux (0...19,999 Lux), 10 Lux (rest of
range)
0.1 ftc (0...1,860 ftc), 1 ftc (rest of
range)
· Accuracies (Nominal temperature
25 °C, ±1 Digit):
± 3 Lux or ± 3 % to reference (Class B,
DIN 5032 part 7)*
· Measuring rate:
0.5 s
* whichever is the greater
Further instrument data
· Protection class: IP40
· Ambient conditions:
0...50 °C, 32...122 °F
· Storage/transport conditions:
-40...70 °C, -40...158 °F
· Voltage supply:
2x 1.5 V type AAA
· Battery life:
200 h (without display light)
· Dimensions:
133x46x25mm / 5.2x1.8x1.0 in (inc.
protection cap)
· Weight: 95 g / 3.4 oz (inc. batteries and
protection cap)
Directives, standards and tests
· EC Directive:2004/108/EEC
Warranty
· Duration: 2 years, warranty conditions:
see www.testo.com/warranty

Product description14
Product description
At a glance
Protection cap: Park position
Light sensor
Display
Control keys
Battery compartment (on rear)
First steps
Inserting batteries:
1 To open the battery compartment, push the battery cover
down.
2 Insert batteries (2x 1.5 V type AAA). Observe the polarity!
3 To close the battery compartment, push the battery cover
back on.
Basic settings (configuration mode):
Adjustable functions
· Auto off function: OFF,ON (instrument switches off automatically if no key is
pressed for 10 minutes)
1 When switching the instrument on, press and hold until
and appear on the display (configuration
mode).
-The adjustable function is displayed. The current setting
flashes.
2 Press ( ) several times until the desired setting flashes.
3 Press ( ) to confirm the input.
- The instrument changes to measuring mode.

Using the product 15
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 - - - - appears.
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.

Maintaining the product16
Maintaining the product
Changing batteries:
1 To open the battery compartment, push the battery cover
down.
2 Remove used batteries and insert new batteries
(2x 1.5 V type AAA). Observe the polarity!
3 To close the battery compartment, push the battery cover
back on.
Cleaning the housing:
Clean the housing with a moist cloth (soap suds) if it is dirty.
Do not use aggressive cleaning agents or solvents!

Tips and assistance 17
Tips and assistance
Questions and answers
Question Possible causes/solutions
Hi · Readings outside the measuring range (too high:
Keep to the permitted measuring range.
· Residual capacity <10 min: Change batteries.
If we could not answer your question, please contact your dealer
or Testo Customer Service. For contact details, please visit www.
testo.com/service-contact.

Notes18