HP 3457A Service Manual page 9

General Information 3457A
Section VI. Replaceable Parts
Section VI lists part numbers for cabinet parts and printed circuit assemblies.
Section VII. Manual Backdating
Section VII contains information required to adapt this manual to instruments whose serial numbers are
lower than those listed on the title page.
Section VIIl. Service
Section VII contains a block diagram theory of operation, schematic diagrams, and procedures to aid in
troubleshooting the HP 3457A.
1-5. INSTRUMENT DESCRIPTION
1-6. The HP 3457A is a versatile high precision digital multimeter which measures ac or de volts, ac or de current,
actde volts or current, resistance, frequency and period. It measures voltages up to 300 Vac or 300 Vde with high
de resolution and accuracy. The instrument is designed for both bench and system use. Program and reading
storage are included to allow high speed measurement applications with reading rates of greater-than 1000 read-
ings per second. Provision has been made for optional assemblies such as a general purpose scanner or multiplexer
assembly.
1-7. SAFETY CONSIDERATIONS
1-8. The HP 3457A is a safety class | instrument (provided with a protective earth terminal). The instrument and
manual should be reviewed for safety markings and instructions before operation. Refer to the Safety Summary
preceding this section for 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 on the title page.
Hewlett-Packard uses a two part serial number in the form xxxxayyyyy, where xxxx is the serial prefix, a is the
country of origin (A=USA) and yryyy is the serial suffix. The serial number
prefix identifies a series of identical
instruments. The serial number suffix is assigned sequentially and is unique to each instrument,
1-12. If the serial number prefix of your instrument is lower than the one listed on the title page, information
contained in Section VII (Manual Backdating) will explain how to adapt this manual to your instrument.
1-13. SPECIFICATIONS