WILLTEK 4403 - Before Startup; During Maintenance and Repair; During Test; Safety Class

Safety Notes
Safety class
xviii WCDMA Options Version 6.20
Safety class
The 4400 is designed and tested in line with DIN 57411 part 1 (protective
measures for electronic test equipment). The instrument complies with safety
class I. It left the works in a perfectly safe condition for operation. To make sure
it stays this way and can be operated without any risk, please observe carefully
the following notes, which are based on section 17 of DIN 57411 part 1 a.
Before startup
During test
During maintenance and repair
Live parts can be exposed when you open covers or remove components.
Connecting parts can also be live.
Ensure proper supply voltage
Before powering on, ensure that the operating voltage which is permitted for
the 4400 (115 V ±20% or 240 V ±20%) is identical with your line voltage. You
do not need to set the voltage range; the 4400 automatically adjusts to the
applied (permissible) line voltage.
The power plug of the 4400 may only be inserted in outlets with a ground
contact.
Never use extension cables without grounding conductor.
Apply proper grounding
The grounding conductor must under no circumstances ever be interrupted,
neither inside nor outside the test set. If there is no grounding through the
grounding conductor, the cabinet of the 4400 could become live as the result
of a defect. This can make the test set a potential risk.
Apply proper grounding
Always plug in the power socket of the 4400 before connecting a test circuit
in order to use the protective effect of the 4400 grounding.
Live parts with and without supply voltage connected
Before any adjustment, maintenance repair or replacement of parts, the test
set must be separated from all voltage sources if it will be necessary to open
it. If any jobs have to be performed on the 4400 while voltage is applied, they
should only be undertaken by a specialist who is aware of the dangers that
are involved. Capacitors in the power supply can still be charged, even though
the instrument has been separated from all voltage sources.