METREL MA 4804, Instruction Manual

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MA 4804 Variable transformer Instrument operation
9
4 Instrument operation
4.1 Working with MA 4804
The MA 4804 is class I equipment. It means that all accessible conductive
parts (case) are connected to PE. For safety working the following shall apply:
Warnings:

Use wall socket with proper earthing on PE terminal!

Never disconnect PE wiring nor cut it, it is hazardous live!

Secondary circuit is floating, it is separated from mains input and
separated from PE. Keep secondary circuit floating or connect to
PE only if necessary!
4.2 Application of MA 4804
General application procedure for MA 4804 is as follows:

Before connection to mains supply keep I/O switch in O (OFF) position,
switch off automatic fuse and rotate dial knob c.c.w. to limit position (0 V
position).

Connect MA 4804 into proper wall socket (see 4.1).

Connect the circuit supplied from MA 4804 into output socket.**

Turn mains switch to I (ON), turn on output fuse and adjust output
voltage.
** If the circuit requires limited voltage range then the last two steps are
modified as follows:

Turn mains switch to I (ON), turn on output fuse and adjust output
voltage into required voltage range.

Turn off output fuse.

Connect the circuit supplied from MA 4804 into output socket.

Turn on output fuse.