Heathkit IN 17 Schematic 2

Page 1

Assembly and Operation

of the
-HEATHKIT

DECADE RESISTANCE KIT

MODEL lN-l7

HEATH COMPANY
BENTON HARBOR. MICHIGAN 49022

TABLE OF CONTENTS

Specifications............................ 2
Introduction.............................. 2
Circuit Description........................ 3
PartsList..........................
Schematic...(fold-out from page)............... 3
Construction NoteS. . ........... ..... .
Step-By-StepAssembly.................... 5
InitialOperationCheck..................... 9
FinalAssembly.......................... 9
Operation........,.................... 10
InCase0fDifficulty.......................10

Replacement Parts Price List. . .... , , . . . . . _ . , , , ll

Factory Repair Service. . .. . . . . .. 12

The Heath Company reserves the right to discontinue instru-
ments and to change specifications at any time without in-
curring any obligations to incorporate new features in
instruments previously sold.

Page 2 _HEATHKII
SPECIFICATIONS
Range ........ 19t0999,999§2in195teps.
Resistors ..................................... Precision, 1/2% accuracy, 1 watt.
Maximum Current For Each Range. . . . l . ..... . . . . . . . . . WORKING RATING MAXIMUM RATING
X1 - 500 ma. 1000 ma.
X10 - 150 ma. 300 ma.
X100- 50 ma. 100 ma.
XlKA 15 ma, 30 ma
XlOK- 5 ma. * 10 met.
XlOOK- 1.5 ma. 3 ma.
Minimum DC Resistance, . , . .................... . . . .025 $2 at terminals with all sw1tches set at zero.
Dimensions .......... , ,,,,,,,,,,,,,,,,,,,,,,,,, 7-1/2" wide x 5" high x 6- 5/8" deep.
NetWeight..........l............ .. 2-1/21bs.
INTRODUCTION

The IN-l7 Decade Resistance Kit was designed as an accurate
Iaboratmyrtvpe instrument for use wherever electrical measure-
ments involving resistors are made. The wide range of available
resistance values makes the lN-l7 invaluable as a variable
multiplier or shunt, a variable substitution resistor, or as an
arm for DC and AC bridges. The Heathkit Decade Capacitance
Kit makes an ideal companion with the lN-l7 for solving re-

sistance and capacitance networks Where a large range of
values are necessary.

Refer to the "Kit Builders Guide" for complete information
on unpacking, parts identification, tools, wiring, soldering, and
step-hy-step assembly procedures.

Page 2

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Page 3

CIRCUIT DESCRIPTION

The series arrangement of the range switches and the precision
resistors as shown on the Schematic Diagram will yield any
resistance value from 1 to 999,999 Din] 0 steps. Each resistor
is rated to be within 1/2% of its ohmic value for precision
applications. The 0 position of the range switches allows the
resistors to be bypassed if desired, The multiplier printed

I KILRESISTORS

lflRESISTORS

Ion RESlSTORS

beneath each range switch on the front panel indicates the
value of each resistor for that particular switch. The "shortmg~
type" switches with makbbeloreubreak action permit smooth
adjustment 0! the resistance value without opening or shorting
of the circuit.

IOOKfl RE SISTORS

SCHEMATIC OF THE HEATHKIT"

DECADE RESISTANCE KIT MODEL 1N-17