User`s guide

Chapter 2 33
Installation
Preparing the 11974 for Use
Installation
Power Requirements
The power requirements for the 11974 are listed below.
WARNING This is a Safety Class I product (provided with a protective earthing
ground incorporated in the power cord). The mains plug shall only
be inserted in a socket outlet provided with a protective earth
contact. Any interruption of the protective conductor, inside or
outside the instrument, is likely to make the instrument dangerous.
Intentional interruption is prohibited.
Setting the Line-Voltage Selector Switch
The 11974-60028 Preselector Power Supply contains the voltage-selector switch for the
11974. Set the power supply’s rear-panel voltage-selector switch to the line-voltage range
(100, 120, 220, or 240 V) corresponding to the available ac voltage. Refer to Figure 2-1 on
page 34.
Table 2-2 Operating Power Requirements
Line Input Power Requirements
100/120 V ac Operation 220/240 V ac Operation
Line Voltage 100 V to 120 V,
±10% 220 V to 240 V, ±10%
Line Current 1 A rms max. 0.5 A rms max.
Line Frequency 47 Hz to 66 Hz 47 Hz to 66 Hz