HEATHKIT  IM-17 Utility Solid State Voltmeter

Description

• The IM‑17 is a utility voltmeter with multiple ranges for both DC and AC voltage, plus resistance measurement capability. It uses solid‑state circuitry including a high‑impedance front end for accurate readings.

The unit was typically sold as a kit that the user assembled, packed in a portable case with built‑in test leads.

Specifications

• DC Voltage Measurement
  • Ranges: 0‑1, 0‑10, 0‑100, 0‑1000 volts DC full‑scale
  • Input Resistance: ~11 megohms on all DC ranges
  • Accuracy: ±3% of full scale (typical)
• AC Voltage Measurement
  • Ranges: Similar to DC, except lowest range is 0‑1.2 V AC full‑scale
  • Input Impedance: ~1 megohm shunted by ~100 pF (38 pF on highest range)
  • AC response varies with range and frequency.
• Resistance Measurement
  • Ranges include Rx1, Rx100, Rx10k, and Rx1M (megohm) scales.
• Physical & Power
  • The IM‑17 is a handheld/benchtop unit weighing several pounds, powered by internal batteries (originally a 1.5 V cell and 8.4 V mercury cell; modern restorations often use a 9 V alkaline).

Controls and Operation

• The instrument usually has a rotary range/function selector that chooses the measurement range and mode (DC volts, AC volts, or resistance). There are zero adjust and polarity controls as needed for accurate readings.
• Test leads are typically built‑in or permanently attached, so no lead switching is required between functions.

Measuring DC Voltage

• Set the function switch to a DC voltage range appropriate for the expected signal.
• Connect the test leads across the circuit or component under test.
• Read the voltage on the DC scale calibrated to full‑scale for that range.
• With input resistance of ~11 megohms, the IM‑17 minimally loads circuits on DC measurement, similar to a high‑quality VTVM of its era.

Measuring AC Voltage

• Set the selector to an AC range.
• Connect test leads to the AC source.
• Read the AC RMS equivalent on the AC‑specific scale.
• Lower AC ranges have dedicated scales because of nonlinearity introduced by the rectifier circuitry.

Measuring Resistance

• Switch to an ohms range (Rx1, Rx100, etc.).
• Connect test leads across the resistor or component.
• Read resistance using the corresponding resistance scale.

Batteries and Power

• Original Heathkit manuals specify using internal batteries including a small DC cell and an 8.4 V mercury cell for bias and operation.
• Modern restorations typically replace the obsolete mercury cell with a standard 9 V battery (with internal modification) for safety and availability.
• Low battery condition can affect measurement accuracy, so battery checks and replacements are recommended when readings seem incorrect.

Maintenance and Calibration

• Because the IM‑17 was originally a kit and earlier instrument, maintenance may include:
• Cleaning and checking connections and switches
• Replacing old batteries
• Adjusting zero and calibration trimmers per the official manual
• Ensuring meter movement is free and responsive

For detailed calibration procedures and troubleshooting, refer to the original IM‑17 manual. A PDF of the full manual is available from vintage documentation archives.

TYPICAL COMPONENT TYPES

 

This chart is a guide to commonly used types of elec- tions
tronic components. The symbols and related illustra tions should prove helpful in identifying most parts and reading the schematic diagrams

INTRODUCTION
|HEATHKIT
The Heathkit Model IM-17 Utility Solid-State Voltmeter is a
compact, battery-powered voltohmmeter. It is accurate and
easy to operatc. The copolymer case (with probe storage
compartment) makes the meter especially suitable for service
calls, as a portable instrument for use in the field, and for
general utility use. Its simplicity makes it an ideal
construction project for the novice in electronics.
The high input resistance of the Voltmeter
on DC voltage ranges places very little loading
on a circuit being tested, The 12-position selector switch provides four separate ranges each for
DC voltage, AC voltage, and resistance measurements. A DC polarity switch allows upscale readings for either positive or negative
voltages without the need of reversing test leads.
The large 4-1/2 inch meter has four easy-toread scales. An accessory jack permits you to
use the Heathkit high voltage and RF accessory probes.
All these features combine to provide a versatile.
accurate, and attractive test instrument that is
designed for long and dependable service at minimum cost.
Refer to the “Kit Builders Guide” for complete
information on unpacking, parts identification,
tools, wiring, soldering, and step-by-step as- sembly procedures.
HEATHKIT Page 3
PART PARTS
No. Per Kit
DESCRIPTION PART PARTS DESCRIPTION
No. Per Kit
CAPACITORS MISCELLANEOUS
Disc
(4)21-27 (23)73-46 3 Plastic grommet
1 005 (24)214-66 1 1.5 V battery holder
(25)214-67 1 8,4 V battery holder
(26)260-1 1
Tubular Alligator clip
(27)436-35 1 Phone jack
(5)23-91
(6)23-61 1 047 µF (1.6 kV) 439-1 1 Red test probe
1 05 F 439-2 1 Black test probe
(28)455-50 1 Knob bushing
(29)462-252 1 Pointer knob
CONTROLS-SWITCHES 407-129 1 Meter
(7)10-201 2 10 k control 85-197-1 1 Circuit board
(8)10-229 1 2000 ປີ control (2 kN) (30)203-701 1 Panel
10-78 95-35 1 115 k control Plastic case
(9)12-80 1 50 k dual tandem control (31)490-5 Nut starter
(10)60-2 1 6-lug slide switch 390-306 1 Model number label
391-34 (11)60-20 1
1 -lug slide switch ✓ Blue and white label
(12)63-473 597-260 1
12-position rotary switch VParts order form
597-308 1 Kit Builders Guide
1 ✓Manual (See front cover for
part number.)
Solder
PARTS LIST
The numbers in parentheses are keyed to the
numbers on the Parts Pictorial (fold-out from
Page 3).
To order replacement parts, refer to the Replacement Parts
Price List and use the Parts Order Form furnished with this TRANSISTORS-DIODES
kit. (13)417-118 4 2N3393 transistor
PART PARTS DESCRIPTION
No. Per Kit
PART (or equivalent)
_ No.
PARTS
Per Kit
DESCRIPTION (14)417-140 1 FET (field effect transistor) BATTERIES
(15)57-27 1 Silicon diode
RESISTORS 2 Watt
(2)3-4-2 1
1/2 Watt 9.1 2 5% (white-brown-goldgold) SHIELDED CABLE-WIRE
(1)1-41 1 √10 2 (brown-black-black)
1-20 2 ✓10 k (brown-black-orange) 343-11 1 Shielded cable
1-22 2 ✓22 k (red-red-orange) Precision 341-1 1 Black test lead
1-24 1 ✓33 kΩ (orange-orange- 341-2 1 Red test lead NOTE: These may vary somewhat in appearance orange) 344-50 1 Black hookup wire from the illustration. 1-35 1 ✓1 megohm (brown-blackgreen)
344-52 1
(3)2-236 Red hookup wire
The following batteries should be purchased at
this time for use in the completed kit:
1 C-cell flashlight battery. (NE DA 14).
1* 8.4 volt mercury battery,
#1611 M).
*Representative manufacturers and their type
numbers are:
1
066 344-59 2-35 ✓White hookup wire 1 9000 2 (9 k) 1-38 Burgess H126 2 ✓3.3 megohm (orangeorange-green)
Ray-O-Vac 1611M
2-41 1 90 ΚΩ Eveready E126 RCA VS328
2-54 1 √200 k HARDWARE Mallory TR126 Silvertone (Sears) R6422
2-51 1 √900 k2
2-237 1 √1.8 megohm (16) 250-52 4-40 x 1/4″ screw 2-52 1 9 megohm (17)254-9 6 ✓#4 lockwasher (18)252-2 6 4-40 nut
In an emergency a 9-volt zinc carbon battery(also N.E.D.A.
#1611) can be used but the result will be short battery life,
excessive “zero” drift, and possible battery contact problems.
(19) 250-229 4 6-32 x 1/4″ phillips head
screw (20)253-10 4 ✓Control flat washer (21)254-4 3 VControl lockwasher (22) 252-7 4 Control nut
KIT Page 3
HEATHKIT]|
PART PARTS DESCRIPTION PART PARTS DESCRIPTION
No. Per Kit No. Per Kit
eads.
y-to- CAPACITORS MISCELLANEOUS
(2)

PARTS PICTORIAL

20 21 22
ou to Disc ssory (23)73-46
3 Plastic grommet
(4)21-27 005 µF (24)214-66
1 1.5 V battery holder
(25)214-67
1 8.4 V battery holder
(26)260-1
1
Tubular Alligator clip (24
(27)436-35 Phone jack atile,
(5 (5)23-91 .047 µF (1,6 kV)
6 23
439-1 Red test probe nat is (6)23-61 05 F 439-2 Black test probe mini- (28)455-50 Knob bushing (29)462-252 Pointer knob CONTROLS-SWITCHES 407-129 iplete
ation. (7)10-201
2 10 k control
as- (8)10-229
1 2000 22 control (2 k2) (30)203-701
95-35 10-78 1 15 k control (31)490-5 (9)12-80 50 k dual tandem control 390-306 (10)60-2 6-lug slide switch 391-34 (11)60-20 1 9-lug slide switch 597-260 (12)63-473 1 12-position rotary switch 597-308
1
85-197-1
Meter
Panel
Plastic case
Nut starter
Model number label
✓Blue and white label
VParts order form
Kit Builders Guide
✓Manual (See front cover for
part
number.)
✓Solder
Circuit board
(7 (8
25
O
t Parts TRANSISTORS-DIODES th this
(13)417-118 4 2N3393 transistor
(or equivalent) (14)417-140 1 FET (field effect transistor) BATTERIES
(15)57-27 1 Silicon diode
gold- SHIELDED CABLE-WIRE
343-11
1 Shielded cable
341-1
1 ✔Black test lead
341-2 ted test lead
rance 344-50 Black hookup wire
The following batteries should be purchased at
this time for use in the completed kit: 1 C-cell flashlight battery. (NE DA 14).
1* 8.4 volt mercury battery, #1611 M).
*Representative manufacturers and their type
numbers are: 344-52 Red hookup wire
344-59
1 White hookup wire
HARDWARE
Burgess
Eveready
Mallory
H126 Ray-O-Vac 1611M
E126 RCA VS328
TR126 Silvertone (Sears) R6422
(16)250-52
6 4-40 x 1/4″ screw
(17)254-9 #4 lockwasher
(18)252-2 4-40 nut
In an emergency a 9-volt zinc carbon battery(also N.E.D.A.
#1611) can be used but the result will be short battery life,
excessive “zero” drift, and possible battery contact problems. (19) 250-229 4 6-32 x 1/4″ phillips head
screw (20)253-10 4 ✓Control flat washer
(21) 254-4
(22)252-7
3 VControl lockwasher
Control nut
10
26
11 27
28 29
12 14
13
15
OR
30
이
이
19 16 17 18 31 +
A
B
D
E
BEVELED
ΟO
G
+ KO

PICTORIAL

D
F LEAD
이
OUTER
RED
WHT BLK RED BLK BLK WHT RED
カ
PICTORIAL 7
Ο
Page 4 ATHKIT
STEP-BY-STEP ASSEMBLY
Before starting to assemble this kit, read the
Kit Builders Guide for complete information
on tools, wiring, soldering, and Step-By-Step
Assembly procedures.
NOTE: The illustrations in the Step-By-Step
Assembly section of the Manual are called Pictorials and Details. Pictorials show the overall
operation for a group of assembly steps; Details
are used in addition to the Pictorials, usually to
illustrate a single step. When you are directed
to refer to a certain Pictorial “for the following
steps,” continue using that Pictorial until you
are referred to another Pictorial for another
group of steps.
Connect one end of each of the following white
wires to the rotary switch. Unless the step directs otherwise, leave the other end of each wire
free, to be connected later. Be sure to position
the free ends of the wires as shown.
When wiring this kit, you will be instructed to
prepare the lengths of wire ahead of time, as in
the next step. To prepare a wire, cut it to the
indicated length and remove 1/4″ of insulation
from each end, The wires are listed in the order
in which they will be used.
Prepare the following lengths ofwhite hookup wire (a length scale is provided on the
fold-out from Page 17).

ROTARY SWITCH PREWIRING

Refer to Pictorial 1 for the following steps.
Note that the two views are of opposite sides of
the switch.
1-1/2″ 1-3/4″
1-1/4″ 1-3/4″
1-3/4″ 2-1/4″
2″ 2″
WIRE FROM TO
NOTE: As illustrated in Detail 1A, a system of
letters and numbers is used to identify the
rotary switch lugs in the following steps. For
example: A4 refers to wafer A, lug 4 of the
wafer. Wafer A is nearest the knob end of the
switch. Note the position of the locating tab in
relation to the numbering of the switch lugs.
Wafers C and Dhave the same numbering system
but are not illustrated.
LENGTH SWITCH
LUG
() 1-1/2″ C5 (S-1) Not connected.
(1-1/4″ C2 (S-1) Not connected,
(1-3/4″ B6 (S-1) Not connected. S 2″ B3 (NS) Not connected.
LOCATING TAB (1-3/4″ B3 (S-2) B11 (S-1).
POSITION (X1-3/4″ B2 (S-1) Not connected. 0 D 0 ( 2-1/4″ A6 (NS) Not connected.
LUG A4 (X 2″ A2 (S-1) A6 (S-2).
SWITCH
FRONT
PLATE
WAFERA
(VIEWED FROM
WAFERB
Detail 1A
Inspect all wires to make sure they are
not touching any part of the switch mechanism except the terminals to which they
are soldered.
Page 4
STEP-BY-STEP ASSEMBLY
ATHKIT HBATHKIT
Before starting to assemble this kit, read the
Kit Builders Guide for complete information
on tools, wiring, soldering, and Step-By-Step
Assembly procedures.
NOTE: The illustrations in the Step-By-Step
Assembly section of the Manual are called Pictorials and Details. Pictorials show the overall
operation for aa group of assembly steps; Details
are used in addition to the Pictorials, usually to
illustrate a single step. When you are directed
to refer to a certain Pictorial “for the following
steps,” continue using that Pictorial until you
are referred to another Pictorial for another
group of steps.
Connect one end of each of the following white
wires to the rotary switch, Unless the step directs otherwise, leave the other end of each wire
free, to be connected later. Be sure to position
the free ends of the wires as shown.
When wiring this kit, you will be instructed to
prepare the lengths of wire ahead of time, as in
the next step. To prepare a wire, cut it to the
indicated length and remove 1/4″ of insulation
from each end, The wires are listed in the order
in which they will be used.
Prepare the following lengths ofwhite hookup wire (a length scale is provided on the
fold-out from Page 17).
BACK LOCATING FRONT
SA
B
FROM LUG B3
Da
CATHODE 3.3 м
DIODE
PICTORIAL 1
1/2″
Page 5
ROTARY SWITCH PREWIRING
Refer to Pictorial 1 for the following steps.
Note that the two views are of opposite sides of
the switch.
1-1/2″ 1-3/4″
1-1/4″ 1-3/4″
1-3/4″ 2-1/4″
21 211
WIRE FROM TO
NOTE: As illustrated in Detail 1A, a system of
letters and numbers is used to identify the
rotary switch lugs in the following steps. For
example: A4 refers to wafer A, lug 4 of the
wafer. Wafer A is nearest the knob end of the
switch, Note the position of the locating tab tab in
relation to the numbering of the switch lugs.
Wafers C and Dhave the same numbering system
but are not illustrated.
LENGTH SWITCH
LUG _
) 1-1/2″ C5 (S-1) Not connected.
(1-1/4″ C2 (S-1) Not connected.
()Prepare the following lengths of
hookup wire:
1-3/4″
1″
1-3/4″
2-1/2″
2-3/4″
2-3/4″
2-1/2″
white
Connect one end of each of the following white
wires to the rotary switch. Leave the other
end free to be connected later unless the step
directs otherwise. Position the ends as shown.
Connect a 3.3 megohm (orange-orangegreen) resistor between lug C8 (S-1) and
lug C10 (NS) of the rotary switch.
NOTE: Refer to Detail 1B to identify the cathode
lead of the silicon diode to be installed in the
next steр.
NOTE: DIODES MAY BE SUPPLIED IN ANY OF THE FOLLOWING SHAPES, THE CATHODE END OF THE DIODE IS MARKED
WITH A BAND OR BANDS. ALWAYS POSITION
SHOWN IN THE PICTORIAL
(1-3/4″ B6 (S-1) Not connected.
2″ B3 (NS) Not connected.
WIRE FROM TO
LENGTH SWITCH
LUG
LOCATING TAB
POSITION
(1-3/4″ B3 (S-2) B11 (S-1).
(X 1-3/4″ B2 (S-1) Not connected. (X) 1-3/4″ C10 (NS) Not connected.
(2-1/4″ A6 (NS) Not connected. (1″ C7 (S-1) D8 (S-1).
(X 2″ A2 (S-1) A6 (S-2).
LUG A4 1-3/4 B7 (S-1) Not connected.
SWITCH (2-1/2″ A12 (S-1) Not connected.
FRONT
PLATE
WAFER A
(VIEWED FROM SHAFT END)
WAFER B
Detail 1.A
(Inspect all wires to make sure they are
not touching any part of the switch mechanism except the terminals to which they
are soldered.
2-3/4″ A9 (S-1) Not connected.
BAND OR BANDS
-Detail 1B
(Connect the cathode lead of the silicon diode
to lug C10 (S-3) and the other lead to lug
C12 (S-1) of the rotary switch.
(Bend lugs D9 and D10 slightly up toward wafer C.
Set the switch aside. It will be installed later.

CIRCUIT BOARD ASSEMBLY

(2-3/4″ A8 (S-1) Not connected.
(2-1/2″ A7 (S-1) Not connected.
Position the circuit board lettered side up on
your work surface as shown in Pictorial 2. Then
complete each step on Pictorials 2 and 3.
Page 6
HEATHKIT HEATHKIT”
START
NOTE: Solder the mounting tabs of controls and the leads of the transistors and vertically-mounted tubular capacitor as each part is
moynted,
2N893 transistors at Q2 and
Q3 (S-6). To identify the transistor leads, line lin up the flat side of the transistor with the flat
outline drawn on the circuit
board. Then insert the leads into
crect holes marked E,
C, and B, Position the transistor
about 1/4″ above the circuit
board, Trim off excesss leads
from the foil side of the board.
FLAT
04 05
CONTINUE
(.005 F disc capacitor.
(10 k (brown-black-orange).
(22 k (red-red-orange).
(33 kn (orange-orange-orange).
(Solder all connections and cut
off the excess leads,
F.E.T. (#417-140) (S-3). NOTE:
Observe
the
location
of
the
leads; then line them up with
G. D, and S marked on the circuit
board, Position the transistor
about 1/4″ above the circuit
board. (The appearance of this
transistor may vary).
START
The plastic nut starter that is pro- he asti ht starter tat s dro vided with this kit will help you pick
up a nut and start it on the screw
threads. Use the larger end for #4
nuts.
NOTE: When soldering battery holder connections, make sure that solder is confined to the point of connection.
(8,4 V battery holder (#214-67).
Position the battery holder as
shown and mount it to the circuit shown and mount it to the circuit board. (Note the + mark on th
holder.)
4-40 SCREW
8.4V BATTERY
Clip the B lead from each of the
two remaining 2N3393 transistors, Then install these transistors at Q4 and Q5 (S-4). Trim
excess leads on the foil side of
the board. Be sure the cut stub
of the Blead does not touch the C
lead. FLAT
22k2 (red-red-orange).
10 k (brown-black-orange).
(3.3 MO (orange-orange-green).
9.1 (white-brown-gold)
2 watt.
Solder all connections and cut
off the excess leads.
.047 µF 1600 V tubular (S-1)
Note banded end, The other end
will be connected later.
4 LOCKWASHER
4-40 NUT
(1,5 V battery holder (#214-66).
Position the battery holder as
shown and mount it to the circuit
board, NOTE: It may be necessary to bend the negative solder
lug to keep it from interfering
with the vertically-mounted cаpacitor.
50 k2 dual control Po- eition th sition the control as indicated
on the circuit board (S-2).
() 10 kΩ control (#10-201) (S-4).
(10 k control (#10-201) (S-4). 2
)/9 kn (precision).
990 (precision).
N) 9 M (precision).
(200 k (precision).
(110 (brown-black-black). ( Solder all connections and cut
off the excess leads.
PICTORIAL 2
05 µF 400 V tubular. Position
the banded end as shown.
(90 k (precision).
(900 ko (precision).
(1,8 MO (precision).
(Solder all connections and cut
off the excess leads.
NOTE: You should have a 1 megohm
resistor (brown-black-green) remaining. It will be used later.
PROCEED TO PICTORIAL 3
4-40 SCREW
1.5 V
BATTERY
HOLDER
#4 LOCKWASHER
4-40 NUT
Page 7
°000
A
CONTINUE σ
(1-1/4″ white wire from lug 1
(S-1) to circuit board hole A
(S-1).
(4-1-1/4″ white wire from lug 2
(S-1) to circuit board hole B
(S-1).
10
Ο
(1-1/2″ white wire from lug 1
(S-1) to circuit board hole C
(S-1).
2
BC
(
(1″ white wire from lug 2 (S-1)
circuit board hole D (S-1).
Rotary switch (#63-473). NOTE:
If any of the switch mounting
If any of the switeh mounting
lugs are bent, straighten them
before installing the switch.
LOCATING
PICTORIAL 3
D
WIDE
(Carefully inspect the switch
lugs which are next to the circuit boards, Any lugs which
might make contact contact to other
components, causing a short
circuit, should be bent away
from the board.
(Solder all switch pins to the foil.
Do not cut off the soldered leads,
FINISH
Page 8
HEATHKIT
CONTROL NUT
ONTRO
FLAT WASHER
OF PANEL
LOCKWASHER
BEVELED
Page 9
PICTORIAL 4
Refer to Pictorial 4 for the following steps.
Place the wires coming from the rotary switch
in the circuit board holes as follows:
PICTORIAL 5
Refer to Pictorial 5 for the following steps. Note
that the position of the circuit board has been
reversed.
Place the wires coming from the rotary switch
in the circuit board holes as follows:
TO CIRCUIT BOARD FROM TO CIRCUIT BOARD FROM SWITCH LUG SWITCH LUG
( C5 hole CC (NS). C10 hole KK (NS).
(02 hole AA (NS). B7 hole HH (NŠ).
(B6 hole EE (NS). V
A12 hole LL (NS).
(B3 hole MM (NS). A9 hole JJ (NS).
B2 hole BB (NS). ()A8 hole FF (NS).
AB hole DD (NS). A7 hole GG (NS).
Detail 5A
Refer to Detail 5A and connect thefree lead
of the .047 µF 1600 V capacitor onthe circuit board to rotaryr switch lug B10 (S-1).
Make sure that no wires obstruct lugs A10,
B9, A4, and C4, to which connections will be
made later.
Set the circuit board aside for the present.
PANEL PARTS MOUNTING
NOTE: Place a soft cloth on your workbench or
table to prevent marring the face of the panel
during the following steps.
Refer to Pictorial 6 (fold-out from Page 4) for
the following steps.
Locate the panel and position it on you work
surface as shown.
)Refer to Detail 6A, and mount the three plastic grommets at G, H, and J,
OUTSIDE OF
PANEL 5/16″ GROMMET
Detail 6в
Refer to Detail 6B, and mount the phone
jack at F. Use a control lockwasher, a control flat washer, and a control nut. Position
the jack as shown.
Refer to Detail 6C, and mount the 6-lug slide switch at
D using two 6-32 x 1/4″ phillips screws.
() In a similar manner, mount the 9-lug slide
switch at E using two 6-32 x 1/4″ phillips
screws. Position the wide space between the
switch lugs as shown in the Pictorial,
SLIDE SWITCH
INSIDE OF
( Solder the 6 wires coming from the switch
to the circuit board. Trim off any excess
wire on the foil side of the board.
Solder the 6 wires coming from the switch
to the circuit board, Trim off any excess
wire on the foil side of the board.
BEND THE LARGE PORTION OF THE GROMMET OVER AND
PRESS IT FIRMLY INTO PLACE
HE SMAL
PORTION GROMME
Detail 6А
Detail 6С
6-32×1/4″
SCREW
Page 10 HHATHKIT HEATHKIT
METER NUT
INSIDE OF
PANEL METER LOCKWASHER
CONTROL
INS
PANEL
CONT SHER
CONTROL FLAT METER
CONTROL
Detail 6D
(Refer to Detail 6D, and mount the15 k control at A using a control lockwasher, a control flat washer, and a control nut. Position
the control as shown.
( In a similar manner, mount the 2000 (2 к)
control at B using a control lockwasher, a
control flat washer, and a control nut.
NOTE: The hardware necessary for mounting the
meter is packaged with the meter and will be referred to as “meter hardware.”
(Remove the spring shorting wire from the
meter terminals.
Refer to Detail 6E, and mount the meter at C.
Use the meter hardware, Save the remaining
meter hardware for use later, Donot damage
the plastic meter case by overtightening
the nuts.
Refer to Detail 6F, and tape a cardboard
protector to the face of the meter.
Detail 6Е
BANDS CORRUGATED CARDBOARD
Detail 7A
PANEL WIRING
OLDER
3/4″
SOLDER
OFF
SHIELD LEAD
Page 11
1/4
TAKING CARE NOT TO CUT THE OUTER SHIELD OF VERY
Refer to Pictorial 7 (fold-out from Page 4) for
the following steps.
) Refer to Detail 7A, and prepare the red and
black test leads.
(Refer to Detail 7B and solder an alligator
clip to one end of the black test lead.
TWIST THE SHIELD WIRE INTO ONE STRAND, REMOVE
THE INNER INSULA APPLY A SMALL
AMOUNT OF SOLDER TO THE END OF THE INNER LEAD
AND THE SHIELD. SOLDER
SOLDER
BLACK TEST LEAD
Detail 7B
()Insert the other end of the black test lead
through grommet H, and tie a knot approximately 3″3″ from this end of the lead.
Prepare the black test probe in the following
manner.
(Cut a 5-1/2″ length from the shielded cable
and put it aside for later use.
(Refer to Detail 7C, and prepare the remaining length of shielded cable.
Refer to Detail 7D for the following steps.
(Cut one lead of a 1 megohm (brown-blackgreen) resistor to a length of 3/8″. Connect
this lead to the end of the shielded cable
without shielded lead (S-1).
Detail 7C
() Cut the free end of the resistor to a length
of 1/2″. Insert this lead into the open end of
the probe point so that approximately 1/4″
extends out through the small hole. About
half the length of the resistor will be inside
the probe point.
(Wrap the resistor lead coming from the
small hole around ind the shank as shown.
()Place the nut on the probe point and tighten it.
This will hold the end of the resistor lead in
place.
()Screw the black probe handle onto the probe
point.
BLACK
PROBE
HANDLE
SHIELDED
ROBE
SHANK THREADED END
SOLDER ( Disassemble the black probe.
Detail 6F
(Insert Insert the end of the cable with shielded lead
through the black probe handle starting from
the threaded end. Pull the cable until the
resistor approaches the probe handle, as
shown.
SMALL HOLE
NUT
Detail 7D
Pagé 12
() Insert the loose end of the shielded cable
through grommet G, and tie a knot approximately 3 inches from this end of the cable.
In a similar manner, install the red test
probe on one end of the red test lead. No
resistor is used, and the inner conductor of
the red test lead is inserted directly into the
small hole of the probe point.
)Wrap the wire lead coming from the small
hole around the shank of the probe point.
N) Place the nut on the probe point and tighten
it.
) Screw the red probe handle onto the probe
point.
(A)
(V
V
1/4
Insert the other end of the red test lead
through grommet J, and tie a knot approximately 6″ from the end of the lead.
Connect the inner lead of the shieldedcable
to lug 2 (NS), and the shield lead to lug 1 (NS),
of phone jack F.
Refer to Detail 7E, and prepare a 5-1/2″
shielded cable as shown.
TWIST AND SOLDER
Detail 7E
-3/4″
1/4″
Connect the inner lead at one end of the
5-1/2″ shielded cable to lug 2 (S-2), and the
shield lead to lug 1 (S-2), of phone jack F.
The other end will be connected later.
(Prepare thefollowing lengths of hookup wire:
5-1/2″ red
6-1/2″ black
6″ white
NOTE: many of the wires installed in the following steps will have only one end connected at
this time, Their free ends will be connected later.
( ) Connect a 5-1/2″ red wire to lug 3 of control
B (S-1).
(Connect 6-1/2″ black wire to lug 2 of control
B (S-1).
( Connect 6″ white wire to lug 1 of control B
(S-1).
(( Refer to Detail 7F, and twist together the
three wires connected to control B. The
wires should be twisted approximately two
turns per inch.
TURNS
INCH
Detail 7F
(Prepare the following lengths of hookup wire:
4″ red
4″ red
4-1/2″ white
4-1/2″ white
4″ black
4″ black
NOTE: You may find it easier to solder the lugs
of slide switch E in the following steps if, before
you connect the wires, you bend the outer rows of
lugs outward slightly.
( Connect one end of a 4″ red wire to lug 8 of
slide switch E (S-1).
(aConnect one end of a 4″ red wireto lug 7 of
slide switch E (S-1).
()Twist together the two red wires connected
to slide switch E to form a twisted pair.
(Connect a 4-1/2″ white wire to lug 5 of
slide switch E (S-1).
(Connect a 4-1/2″ white wire to lug 4 of
slide switch E (S-1).
(Twist together the two white wires connected
to slide switch E to form a twisted pair.
(Connect a 4″ black wire to lug 3 of slide
switch E (S-1).
(Connect a 4″ black wire to lug 2 of slide
switch E (S-1).
Twist together the two black wires connected
to slide switch E to form a twisted pair.
(
HEATнкI’
Prepare the following lengths of hookup wire:
1″ red
1″ black
3-1/2″ red
3-1/2″ black
3-1/2″ black
4-3/4″ white
Connect a 1″ red wire between lugs 3 (S-1)
and 4 (NS) of slide switch D.
(Connect a 1″ black wire between lugs 1 (NS)
and 6 (S-1) of slide switch D.
Connect a 3-1/2″ red wire to lug 4 of slide
switch D (S-2).
(Connect a 3-1/2″ black wire to lug 1 of slide
switch D (S-2).
(Twist together the red from lug 4 andblack
wire from lug 1 of slide switch D.
)Cofnect a 3-1/2″ black wire to lug 5 of slide
switch D (S-1).
(Connect a 4-3/4″ white wire to lug 2 of slide
switch D (S-1).
(Twist together the black wire from lug 5 and
white wire from lug 2 of slide switch D.
CIRCUIT BOARD WIRING
Refer to Pictorial 8 (fold-out from this Page)
for the following steps.
Prepare the following lengths of hookup wire:
1″white
1-1/4″ white
3″ red
3″ black
() Connecta 1″ length of white wirefrom lug
of the Bias Adj control (S-1) to circuit
board hole M (S-1).
( Connect a 1-1/4″length of white wire from
lug 1 of the Bias Adj control (S-1) to circuit
board hole L (S-1).
(VConnect one end of a 3″red wire to hole F in
the circuit board (S-1).
Page 13
☑ Connect one end of a 3″black wire to hole E
in the circuit board (S-1).
(1) Twist these two wires together to form a
twisted pair, Position them as shown.
( Connect the free end of the black test lead to
circuit board hole K (S-1).
Connect the twisted wires from control B as
follows:
Red wire to lug 2 on the Bias Adj control
(S-1).
(V) White wire to lug 6 on the Bias Adj control (S-1).
(V Black wire to circuit board hole N (S-1).
Connect the wires from switch E to the circuit
board as follows:
() Either white wire to hole P (S-1), and the
other white wire to hole R (S-1).
Either black wire to hole T (S-1), and the
other black wire to hole S (S-1).
Either red wire to hole W (S-1), and the
other red wire to hole U (S-1).
(V Connect the loose end of the red test lead
to lug B9 of the rotary switch (S-1).
Connect the red and black twisted pair from
slide switch D as follows:
(Red wire to circuit board hole J (S-1).
(Black wire to circuit board hole H (S-1).
Conpect the black and white twisted pair frorom
slide switch D to the rotary switch as follows:
White wire to lug A10 (S-1).
Black wire to lug A4 (S-1).
Connect the inner lead of the 5-1/2″ shielded
cable from phone jack F to lug C4 of the rotary switch (S-1), and the shield to circuit
board hole G (S-1).
KIT
HEATHKIT Page 13
itrol
) Prepare thefollowing lengths of hookup wire:
1″ red
☑ Connect one end of a 3″ black wire to hole E
in the circuit board (S-1).
ol B
the
1″ black
3-1/2″ red
3-1/2″ black
(✓) Twist these two wires together to form a
twisted pair. Position them as shown.
BLK
BIAS ADJ
PO0R 2.1
INSET
The
two
(
vire:
lugs
fore
‘s of 8 of 7 of
cted
air.
of
4 of
cted
air.
lide
lide
cted
air.
3-1/2″ black
4-3/4″ white
Connect a 1″ red wire between lugs 3 (S-1)
and 4 (NS) of slide switch D.
Connect a 1″ black wire between lugs 1 (NS)
and 6 (S-1) of slide switch D.
Connect a 3-1/2″ red wire to lug 4 of slide
switch D (S-2).
Connect a 3-1/2″ black wire to lug 1 of slide
switch D (S-2).
()Twist together the red from lug 4 and black
wire from lug 1 of slide switch D.
() Cofnect a 3-1/2″ black wire to lug 5 of slide switch D (S-1).
()Connect a 4-3/4″ white wireto lug 2 of slide
switch D (S-1).
()Twist together the black wire from lug 5 and
white wire from lug 2 of slide switch D.
CIRCUIT BOARD WIRING
Refer to Pictorial 8 (fold-out from this Page)
for the following steps.
Prepare the following lengths of hookup wire:
1″ white
1-1/4″ white
3″ red
3″ black
() Connect a 1″ length of white wire from lug
of the Bias Adj control (S-1) to circuit
board hole M (S-1).
(Connect a 1-1/4″ length of white wire from
lug 1 of the Bias Adj control (S-1) to circuit
board hole L (S-1).
(☑ Connect one end ofa 3″ red wire to hole F in
the circuit board (S-1).
(W Connect the free end of the black test lead to
circuit board hole K (S-1).
Connect the twisted wires from control B as
follows:
Red wire to lug 2 on the Bias Adj control
(S-1).
(V) White wire to lug 6 on the Bias Adj control (S-1).
Black wire to circuit board hole N (S-1).
Connect the wires from switch E to the circuit
board as follows:
() Either white wire to hole P (S-1), and the
other white wire to hole R (S-1).
Either black wire to hole T (S-1), and the
other black wire to hole S (S-1).
Either red wire to hole W (S-1), and the
other red wire to hole U (S-1).
(✓ Connect the loose end of the red test lead
to lug B9 of the rotary switch (S-1).
Connect the red and black twisted pair from
slide switch D as follows:
(Red wire to circuit board hole J (S-1). ( Black wire to circuit board hole H (S-1).
Connect the black and white twisted pair from
slide switch D to the rotary switch as follows:
White wire to lug A10 (S-1).
Black wire to lug A4 (S-1).
Connect the inner lead of the 5-1/2″ shielded
cable from phone jack F to lug C4 of the rotary switch (S-1), and the shield to circuit
board hole G (S-1).
INSET
D
B
RED
REC
PICTORIAL 8
SIDE VIEW
ا الدار
دارد سال
ZERO OHMS UTILUTYER Ο
1000
VOLTS7 100
T IM-17
MECHANICAL POWER POWER
FIGURE 1
BIAS
FIGURE 2
Page 14
FINAL WIRING
Refer to Pictorial 9 for the following steps.
( Refer to Detail 9A and thread a meter nut
onto each meter stud, Then place a meter
washer on each stud.
VOLIS
SELECTOR 10-32 NUT
POLARITY WASHER
Detail 9A
|HEATHKIT
INSET
CIRCUIT BOARD
IS PARALLEL TO FRO
CONTROL NUT
CONTROL FLAT
BLUE AND WHITE
소
8.4 VOLT
(Position the circuit board so the rotary
switch shaft extends through its hole in the
panel and the meter studs extend through
the circuit board holes.
) Adjust the two meter nuts so the circuit
board is parallel to the front panel as
shown in the inset drawing on the Pictorial.
(✓) Place a meter lockwasher and a meter nut
on each of the two studs extending from the
circuit board, Leave the nuts loose.
() Secure the rotary switch to the panel. Use a
control flat washer and a control nut.
(Tighten the nuts on the meter studs. CAU- VTION: Do not overtighten the nuts as the
circuit board can be damaged.
VeConnect the red wire from hole F of the
circuit board to lug 3 of control A (S-1).
) Connect the black wire from hole E of the circuit ui board to lug 2 of control A (S-1).
RED
SHEROOTH
10-32 NUT
PICTORIAL 9
Refer to Detail 9B for the following steps.
☑With a pair of pliers, rotate the shaft of the rotary
switch so its flat side is facing the 1000 position in the
DC Volts range, as shown. NOTE: Be sure to leave the
shaft in this position for the following steps.
( Press the knob bushing onto the shaft. Note the
location of the spring.
Position the knob with the pointer directed towards
the 1 position in the DC Volts range and press the knob
firmly onto the knob bushing.
Carefully remove the knob bushing and knob together.PICTORIAL

Documents / Resources

HEATHKIT IM-17 Utility Solid State Voltmeter [pdf] Instruction Manual IM-17, IM-17 Utility Solid State Voltmeter, IM-17, Utility Solid State Voltmeter, Solid State Voltmeter, State Voltmeter, Voltmeter

References

• User Manual