SAFETY INSTRUCTIONS 
5 
SAFETY INSTRUCTIONS 
This chapter contains important safety instructions 
that you must follow when operating the GPD-
3303 series and when keeping it in storage. Read 
the following before any operation to insure your 
safety and to keep the best condition for the GPD-
3303 series. 
Safety Symbols 
These safety symbols may appear in this manual or on the GPD-3303 
series. 
 
 WARNING 
Warning: Identifies conditions or practices that 
could result in injury or loss of life. 
 CAUTION 
Caution: Identifies conditions or practices that 
could result in damage to the GPD-3303 series or 
to other properties. 
 
DANGER High Voltage 
 
Attention Refer to the Manual 
 
Protective Conductor Terminal 
 
Earth (ground) Terminal 
    GPD-3303 Series User Manual 
6 
Safety Guidelines 
 
General 
Guidelines 
 CAUTION 
•  Do not place any heavy object on the GPD-3303 
series. 
•  Avoid severe impacts or rough handling that 
leads to damaging the GPD-3303 series. 
•  Do not discharge static electricity to the GPD-
3303 series. 
•  Do not block or obstruct the cooling fan vent 
opening. 
•  Do not perform measurement at circuits directly 
connected to Mains (see note below). 
•  Do not disassemble the GPD-3303 series unless 
you are qualified as service personnel. 
 
(Measurement categories) EN 61010-1:2001 specifies the 
measurement categories and their requirements as follows. The 
GPD-3303 series falls under category I. 
•  Measurement category IV is for measurement performed at the 
source of low-voltage installation. 
•  Measurement category III is for measurement performed in the 
building installation. 
•  Measurement category II is for measurement performed on the 
circuits directly connected to the low voltage installation. 
•  Measurement category I is for measurements performed on 
circuits not directly connected to Mains.
 
Power Supply 
 WARNING 
•  AC Input voltage: 100V/120V/220V/230V 
±10%, 50/60Hz 
•  Connect the protective grounding conductor of 
the AC power cord to an earth ground, to avoid 
electrical shock. 
Fuse 
 WARNING 
•  Fuse type: 100V/120V: T6.3A/250V, 
220V/230V: T3.15A/250V 
•  Make sure the correct type of fuse is installed 
before power up.