Installation; Introduction; Initial Inspection; Power Requirements - HP 3478A Technical Manual

2-1.

INTRODUCTION

2-2. This section of the manual has the necessary
information and instructions to install and interface the -hi
Model 3478A Digital Multimeter. Included are initial
inspection procedures,
environmental information, and instructions for repacking
the instrument for shipment. The information in this
section is for Service Trained Personnel.
The information in this manual is for the use of
Service Trained Personnel. To avoid electrical shock, do
not perform any procedures in this manual or do any
servicing to the 3478A unless you are qualified to do so.
2-3.

INITIAL INSPECTION

2-4. The 3478A
mechanically and electrically before shipment. It should
be free of mars or scratches and in perfect electric; order
upon receipt. The multimeter should be inspected for any
damage that may have occurred in transit. If the shipping
container or cushioning material is damaged, should be
kept until the contents of the shipment hay been checked
for completeness and
mechanically and electrically checked. Procedure for
checking the electrical performance of the 3478A al in
Section IV. If there is mechanical damage, the cot tents
are incomplete, or the multimeter does not pass the
Performance Test, notify the nearest Hewlett-Packard
office (a list of the -hp-Sales/Service offices is located i
the back of the manual). If the shipping container
damaged or the cushioning material shows signs C
stress, notify the carrier as well as the Hewlett-Packard
office. Save the shipping material for the carrier's
inspection.
2-5. POWER REOUIREMENTS
2-6. The 3478A requires a power source of 100V,
120w 220V, or 240V ac (- 10%, + 5%), 48Hz to 440Hz
sing phase. The maximum power consumption is 25VA.
For the 3478A to meet its noise and normal mode
rejection specifications, the multimeter must be operated
using line frequency of either 50Hz or 60Hz (dependent
on instrument option). A listing of the 3478A's power
options, the corresponding power line voltages and
frequencies, and fuses are as follows:
power requirements,
was carefully inspected
the instrument ha
SECTION II

INSTALLATION

Option
Option 315
Option 316
Option 325
Option 326
Option 335
Option 336
Option 345
Option 346
Before
3478A,make sure the power source
matches the power requirements of the
multimeter, as marked on the rear panel
(below the power receptacle). If the
instrument is incompatible with the
available power source, go to paragraph
2-7 to reconfigure the multimeter.
bot
2-7.

Line Frequency and Line Voltage Selection

been
To avoid electrical shock and personal
in- jury, make sure the multimeter is
disconnected from its external power
voltage source before removing any
covers.
2-8. The Power Line Frequency configuration of the
3478A is done by the 8 section "DIP" switch at the
multimeter's rear panel. Locate the switch (shown in
Figure 2-1) and set the switch to the desired power
frequency (50Hz or 60Hz), as shown in the figure. To set
the 3478A's correct line voltage, perform the following
2-1
Voltage and Frequency
100V ac @ 50Hz
100V ac @ 60Hz
120V ac @ 50Hz
120V ac @ 60Hz
220V ac @ 50Hz
220V ac @ 60Hz
240V ac @ 50Hz
240V ac @ 60Hz
CAUTION
connecting power
Figure 2-1. Line Frequency Switch
TM 11-6625-3071-14
Fuse
250mA
250OmA
250mA
250mA
125mA
125mA
125mA
125mA
to the