8842A
Instruction Manual
2-1. INTRODUCTION
This section provides instructions for installing and operating the 8842A. Refer to
Section 4 for measurement considerations.
2-2. INSTALLATION
2-3. Installing the Power-Line Fuse
WARNING
FOR POWER-LINE VOLTAGES OF 198V TO 250V, THE POWER-
LINE FUSE MUST BE REPLACED WITH A 1/8A, 250V SLO-BLO
FUSE FOR FIRE PROTECTION. TO AVOID ELECTRIC SHOCK,
REMOVE THE POWER CORD BEFORE REPLACING THE
EXTERNAL LINE FUSE.
The 8842A has a rear-panel power-line fuse in series with the power supply. A 1/4A, 250V slow-blow fuse is installed in the factory for operation from 90V to 132V. For operation with power-line voltages of 198V to 250V, the fuse must be replaced with a 1/8A, 250V slo-blow fuse.
To replace the power-line fuse, first remove the power cord. Then turn the rear-panel fuse cover 1/4-turn counterclockwise with a screwdriver.
For power-line voltages of 198V to 250V, use only a 1/4 x 1 1/4 (6.3mm x 32mm) fuse with at least a 100A breaking capacity.
2-4. Connecting to Line Power
WARNING
TO AVOID SHOCK HAZARD, CONNECT THE INSTRUMENT
POWER CORD TO A POWER RECEPTACLE WITH EARTH
GROUND. TO AVOID INSTRUMENT DAMAGE, CHECK THAT
THE REAR PANEL LINE VOLTAGE SELECTION SWITCHES ARE
SET TO THE POWER-LINE VOLTAGE IN OUR AREA.
The 8842A can be configured to accept line power of 100, 120, 220, or 240V ac (+/-10%, 250V maximum) at 50, 60, or 400 Hz. The voltage must be selected by setting the rear panel LINE SET switches as shown in Figure 2-1. The 8842A automatically senses the power-line frequency at power-up, so that no adjustment for frequency is necessary.
Figure 2-1. Line Voltage S election Settings
