Instruction manual symbol: the product 
will 
be marked with this 
symbol when 
it 
is necessary for the user to refer 
to 
the instruction 
manual in order 
to 
protect against damage 
to 
the instrument. 
A 
Indicates dangerous  voltage  (terminals fed  from  the  interior  by 
voltage exceeding 
lo00 
volts must  be 
so 
marked). 
/s 
Protective  conductor  terminal.  For  protection  against  electrical 
shock in case 
of 
a 
fault. 
Used  with  field wiring terminals 
to 
in- 
dicate  the terminal  which  must  be  connected 
to 
ground  before 
4 
- 
OR@ 
operating equipment. 
Low-noise 
or 
noiseless, clean ground (earth) terminal.  Used  for 
a 
signal common, as well  as providing protection against electrical 
shock in case of a 
fault. 
A terminal marked with this symbol must 
.be connected to ground in the manner described in the installation 
(operating) manual, and before operating the equipment. 
D 
, 
Frame or chassis terminal. A connection to the frame (chassis) of 
/f;r 
OR 
1, 
the equipment  which  normally includes 
all 
exposed  metal  struc- 
tures. 
Alternating current (power line). 
- 
- - 
- 
Direct current (power line). 
Alternating or direct current (power line). 
The WARNING sign denotes 
a 
hazard. 
It 
calls attention 
to 
a 
pro- 
cedure, practice, condition 
or 
the like, which, 
if 
not correctly per- 
0 
formed or adhered to, could result in injury or death 
to 
personnel. 
WARNING 
SAFETY 
SYMBOLS 
General Definitions of  Safety  Symbols 
Used 
On  Equipment 
or 
In Manuals. 
The CAUTION  sign  denotes 
a 
hazard. 
It 
calls  attention 
to 
an 
operating procedure, practice, condition 
or 
the like, which,if  not 
correctly performed  or adhered to, could  result  in  damage 
to 
or 
destruction of part or all 
of 
the product. 
CAUTION 
The NOTE sign denotes important information. 
It 
calls attention 
to 
procedure,  practice, condition or the like, which is essential 
to 
highlight. 
E 
'