Heathkit IM-4100 - Page 6

Page 2
GegHEATHKIT®
INTRODUCTION
The Heathkit Model ItM-4100 Frequency Counter is a
versatile, easy-to-use, solid-state frequency counter which
can accurately measure frequencies to over 30 MHz. The
Counter also is a period meter and an events counter.
The following features make this Counter very versatile:
@ Operates from 120 volts AC, 240 volts AC, or
12 volts DC.
Combined power switch and time base switch.
3-position Mode switch.
Input Attenuator switch.
Overrange indicator.
@ Reset pushbutton switch.
@ External time base switch and connectors.
Excellent accuracy is assured by a modern digital design and
a 10 MHz crystal oscillator. Additional features include a
rugged and compact cabinet, and a swing-into-position
handle to elevate the front panel to a desired viewing angle.
Exceptional accuracy, compact design, and the simplified
operating controls combine to make this Counter an
invaluable tool for the engineer, technician, or hobbyist.
Refer to the “Kit Builders Guide’ for information on
unpacking, parts identification, tools, wiring, soldering, and
step-by-step assembly procedures.
PARTS LIST
Check each part against the following list. Make a check (Y )
in the space provided as you identify each part. The parts
may vary slightly from the illustration. Any part that is
individually packaged with a part number on it should be
kept in its package after it is identified until you use it.
Some parts are marked with a “’171-” or a ““172-"" packaging
number. These numbers are used for packaging only and do
not appear in the Manual ‘‘Parts List.’’ Save all packaging
material until all parts have been located.
To order a replacement part, use the Parts Order Form
furnished with this kit. If a Parts Order Form is not
available, refer to ““Replacement Parts” inside the rear cover.
For pricing information, refer to the separate ‘‘Heath Parts
Price List.”
Each circuit part in this kit has its own circuit component
number (R2, C4, etc.). Use these numbers when you want to
positively identify the same part in the various sections of
the Manual. These numbers, which are especially useful
when a part has to be replaced, appear:
In the Parts List,
At the beginning of each step where a component is
installed,
In some illustrations,
In the Schematic,
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— Inthe sections at the rear of the Manual.