Testboy TV 455VDE-tester Testboy TV 455 Manuale Utente

 
Unauthorized persons are not allowed to open the TESTBOY TV 450 instrument. There 
are no user replaceable components inside the instrument, except the battery and fuse 
under rear cover. 
 

 
There is a fuse under back cover of the TESTBOY TV 450 instrument. 
 

‰

 

F1  
M 0.315 A / 250 V, 20

×5 mm 

This fuse protects internal circuitry for continuity functions if test probes are 
connected to the mains supply voltage by mistake during measurement. 

 
Warnings: 

‰

 

  Disconnect all measuring accessory and switch off the instrument 

before opening battery / fuse compartment cover, hazardous voltage 
inside! 

‰

 

Replace blown fuse with original type only, otherwise the instrument may be 
damaged and/or operator’s safety impaired! 

 
Position of fuse can be seen in 

Figure 3.4 in chapter 3.3 Back panel. 

 

 
No special maintenance is required for the housing. To clean the surface of the 
instrument use a soft cloth slightly moistened with soapy water or alcohol. Then leave 
the instrument to dry totally before use. 
 
Warnings: 

 

‰

 

Do not use liquids based on petrol or hydrocarbons! 

‰

 

Do not spill cleaning liquid over the instrument! 

 

 
It is essential that the test instrument is regularly calibrated in order that the technical 
specification listed in this manual is guaranteed. We recommend an annual calibration. 
Only an authorized technical person can do the calibration. Please contact your dealer 
for further information. 
 

 
For repairs under warranty, or at any other time, please contact your distributor.