SECTION 2
FAMILIARIZING YOURSELF WITH THE HP 4278A
2-1. INTRODUCTION
This section provides basic operating information in the form of practice exercises for first
time HP 4278A users. Read this section before operating your HP 4278A.
The WARNINGS, CAUTIONS, and NOTES given throughout this document must be carefully
followed to ensure the operator's safety and the serviceability of the 4278A.
WARNING
BEFORE TURNING THE 4278A ON, BE SURE ALL PROTECTIVE EARTH TER-
MINALS, EXTENSION CORDS, AUTO-TRANSFORMERS, AND DEVICES CON-
NECTED TO THE 4278A ARE CONNECTED TO EARTH GROUND. ANY INTER-
RUPTION OF EARTH GROUND CONSTITUTES A SHOCK HAZARD WHICH MAY
RESULT IN PERSONAL INJURY.
ONLY FUSES WITH THE REQUIRED CURRENT RATING AND OF THE SPECIFIED
TYPE CAN BE USED. DO NOT USE A SUBSTITUTE FOR THE PROPER FUSE
AND NEVER SHORT CIRCUIT THE FUSE-HOLDER. DOING SO CONSTITUTES A
SHOCK AND FIRE HAZARD.
CAUTION II
Before you turn your 4278A on, be sure to set the voltage selector to the line
voltage to be used, or the instrument will be damaged.
2-2. PANEL FEATURES
Figures 2-1 and 2-2 identify and briefly describe the purpose of each key, indicator, and
connector on the front and rear panels of the 4278A. Section 3 provides a detailed descrip-
tion of each 4278A control.
2-1
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