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                                    The standard 5328A mainframe measures frequency, period,
period average, time interval, time interval average,
and ratio. A totalize function is also provided. The
capabilities of the instrument are expanded (as shown
in Table 1-3) by installing the options described in
paragraph 1-17. The 5328A provides an 8-digit (9 with
Option 030) LED display, display storage, and leading
zero blanking. Decimal point and unit readouts are
displayed automatically. Two independent selectable
input channels are provided for time interval
measurements. Each input channel has an attenuator,
trigger slope selector, level control, ac-dc coupling,
and an oscilloscope marker output. Rear panel connectors
provide a gate output, a time base output and an input
for an external frequency standard. An ARM switch
on the rear panel allows arming by the signal being
measured (switch OFF) or by another input signal
(switch ON).

(Including Options 010, 011, 020, 021, 030, and 040)

This manual applies to Hewlett-Packard Model 5328A Universal
Counters with serial prefix number Ί604Α.

This manual provides service information for the
Hewlett-Packard Model 5328A Universal Counter (including
Option 010). A separate Installation and Service Manual is
provided for each option supplied with the 5328A. Operating
information for the 5328A (with options) is covered in the
5328A Users Manual.
1-3. This manual is divided into five sections containing
the following information:
SECTION I GENERAL INFORMATION covers a description of the
counter, options, equipment supplied, accessories available,
and specifications.
SECTION II THEORY OF OPERATION covers a description of the
general operating principles of the counter in reference to
block and schematic diagrams of each assembly.
SECTION III MAINTENANCE contains maintenance and service
information including a list of assemblies, recommended test
equipment, performance checks and adjustments.
Troubleshooting procedures and flowcharts are included in
this section.
SECTION IV REPLACEABLE PARTS provides a complete list of
replaceable parts and information for ordering parts.
SECTION V MANUAL CHANGES AND OPTIONS contains information on
manual changes and available options. Field installation of
Option 010 Oven Oscillator is contained in this section.
SECTION VI SCHEMATIC DIAGRAMS contains schematic diagrams
and component locators. A description of reference
designators, signal mnemonics and printed-circuit card
identification is included.