Heathkit IG 1271 Manual

Page 1

Heathkit® Manual

for the

FUNCTION
GENERATOR
Model lG-1271

595-1655-13

TABLE OF CONTENTS

Introduction ...................................

Parts List .....................................

Stap-by-Step Assembly. . ..............
Circuit Board ....................... 22
Front Panel ................................... 24
Chassis Wiring ............................ 26
120 VAC - 240 VAC Operation . ............ 28
Test Cable Assembly .................... a1
Notch Filter Assembly ................... 32

Calibration ............................... 32

Final Assembly ...... 37

Operation ......................................... 39

HEATH COMPANY
BENTON HARBOR, MICHIGAN 49022

In Case of Difficulty ................................ 4O

Troubleshooting Chan ................... 41
Circuit Description ............................ 42
Specifications .......................... . . . 45
Chassis Photograph... ............ . 46
Circuit Board X-Ray View . . .................... 47
Circuit Board Voltage Chart . .................... 48
Identification Chan ............................. . . 49
Schematic (told-out from page) . . ................ 49
Warranty ............................ Inside front cover
Customer Service .................... inside rear cover

Copyright © l974
Heath Company
All Rights Reserved

Page 2

Page 2

I-IELATI-IK131"a

INTRODUCTION

The lG-127l Function Generator is a quality test instrument
that will produce sine, square, and triangle waveforms over a
frequency range of 0.1 Hz to 1 MHz. This wide range of
frequencies is divided into six smaller ranges, and each range
is variably controlled over a 100 to 1 frequency ratio.

The output supplies a 10-volt peak-to-peak signal into a
50-ohm load and features a calibrated attenuator that is
adjustable in 10 dB steps, from 0 to 50 dB. Also included is
a continually variable attenuator that provides up to 20 dB
additional attenuation.

PARTS

Check each part against the following list. Make a check (\/l
in the space provided as you identify each part. Any part
that is packed in an individual envelope with a part number
on it should be placed back in the envelope after you
identify it until it is called for in a step. Do not throw away
any packing material until all parts are accounted for.

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
of the Manual. For pricing information, refer to the separate
Heath Parts Price List."

Most of the components are mounted on one circuit board
which makes this unit easy to assemble. The compact size
and light weight allows the Generator to be easily moved
and allows it to be set almost anywhere.

Refer to the Kit Builders Guide for/nformation on tools,
wiring, soldering, and parts identification.

LIST

Each circuit part in this kit has its own 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 if 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,

- In the sections at the rear of the Manual.

brown-gold)

QTY. DESCRIPTION PART CIRCUIT
No. Component No.
R ESISTORS
1/4-Wafl
(AK 2 2.2 o, 5% (red 6-22942 R1, R3
, red-gold-gold)
(W) 2 47 Q, 5% (yellow- 6-470-12 R36, R37
i violetblack-gold)
(M) 2 150 0., 5% (brown- 6-151-12 R31, R61
l green-brown-gold) // /
,(U) 1 220 Q, 5% (red-red 6-221-12 R8 :
brown-gold) y 0R
(\l ) «2 330 o, 5% (orange- 6-331-12 R19, R35 /
orange-brown-gold)
(\j) 1 470 Q. 5% (yellow- 6-471-12 R20
violet-brown-gold)
(\/) 1 560 Q, 5% (green-blue 6-561-12 R21