Instrument Description; Safety Considerations; Instruments Covered By This Manual - HP 3457A Service Manual

General Tnformation
Section VI. Replaceable Parts
Section VI lists part numbers f o r cabinet parts and printed circuit assemblies.
Section VII. Manual Backdating
Section VII contains information required t o adapt this manual t o instruments whose serial numbers a r e
lower than those listed o n the title page.
Section VIII. Service
Section VIIl contains a block diagram theory of operation, schematic diagrams, and procedures t o aid in
troubleshooting the H P 3457A.
1-5. INSTRUMENT DESCRIPTION
1-6. T h e HP 3457A is a versatile high precision digital multimeter which measures a c o r d c volts, a c o r d c current,
ac+dc volts o r current, resistance, f r e q ~ ~ e n c y and period. It measures voltages u p t o 300 Vac o r 300 Vdc with high
d c resolution and accuracy. The instrument is designed f o r both bench and system use. Program and reading
storage a r e included t o allow high speed measuren~ent applications with reading rates of greater-than 1000 read-
ings per second. Provision has been made f o r optional assemblies such as a general purpose scanner o r m~rltiplexer
assembly.
1-7. SAFETY CONSIDERATIONS
1-8. T h e HP 3457A is a safety class 1 instrument (provided with a protective earth terminal). T h e instrument a n d
manual should be reviewed f o r safety markings and instructions before operation. Refer t o the Safety S ~ r m m a r y
preceding this section f o r appropriate safety instructions and markings covering this instrument.
1-9. INSTRUMENTS COVERED BY THIS MANUAL
1-10. Instruments covered by this manual are identified by a serial number prefix listed o n the title page.
Hewlett-Packard uses a t w o part serial number in the f o r m
X X X X A Y Y Y Y Y ,
where x x x x is t h e serial prefix,
A
is the
country of origin (A=USA) and
Y Y Y Y Y
is the serial suffix. The serial number prefix identifies a series of identical
instruments. T h e serial number suffix is assigned sequentially and is unique t o each instrument.
1-1 1. If
the serial number prefix of your instrument is greater than the one listed o n the title page, a yellow
Manual Changes supplement will explain how t o adapt this manual t o your instrument.
1-12. If the serial number prefix of
YOLII.
instrument is lower than the one listed o n the title page, information
contained in Section VII (Manual Backdating) will explain how t o adapt this manual t o your instrument.
1-1
3.
SPECIFICATIONS
1-14.
Specifications f o r the
HP
3457A Multimeter are listed in Table
1-1.
These specifications a r e the perfor-
mance standards which the instrument is guaranteed t o meet.