Heathkit ID 4001 Manual

Page 1

HEATHKIT®
MANUAL

HEATH COMPANY - BENTON HARBOR, MICHIGAN

Page 5

ATHKIT

INTRODUCTION

The Heathkit Model ID-4001 Digital Weather Compu-
ter is a microprocessor-based meteorological unit
which measures and displays several weather vari-
ables. These variables are useful to boaters. pilots,
farmers. amateur radio operators. meteorologists,
climatologists. and general comsumers.

The Computer contains a 6-digit clock which dis-
plays time in either a 12- or 24-hour format. A 4-year
calendar also uses the same six digits on alternate
cycles. or you can use a rear panel switch to continu-
ously display the time or date.

Two digits display the wind speed while one of six-
teen indicators shows the wind direction by compass
point and radial degrees. A rear panel switch lets you
select whether the wind speed is in miles-per-hour,
knots, or kilometers-per~hour and a front panel indi-
cator shows you which is selected. A front panel
switch also allows you to display the wind speed as
an instantaneous or average wind. Another switch
recalls the maximum gust from memory along with
the date and time it occurred. You can also hold this
date or time continuously on the display.

Indoor and outdoor temperatures are alternately dis-
played with a Z-l/Z-digit display. A separate indi-
cator shows you which temperature is displayed and
whether the temperature is in Celsius or Fahrenheit.
A front panel switch enables you to recall from mem-
ory what the highest or lowest temperature was and
the date and time it occurred. Another front panel
switch lets you display the wind chill temperature.
Two rear panel switches (which pertain to tempera-
ture] allow you to display the temperature in "C or °F,
and hold the display at either an indoor or an outdoor
reading.

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Barometric pressure is displayed by a 4-digit display,
and separate indicators show whether the pressure is
rising or falling. You can use switches on the front
panel to cause the display to show the rate of change
per hour. and recall from memory the date and time of
minimumor maximum pressure. A rear panel switch
allows you to display the pressure in millibars or
inches of mercury. Indicators also show whether the
display is in millibars or inches of mercury.

You can clear any, or all. memory contents at any time
by simultaneously pushing the corresponding front
panel button and the Clear button.

Terminal strips on the bottom of the Computer allow
you to connect a chart recorder (with external slope
and intercept scaling) to make permanent records of
outdoor temperature and barometric pressure. You
can also connect an external battery [6.2 to 14.8 VDC)
to the terminal strips to hold the memory contents
intact during brown-out" or power interruptions.
Typical battery current drain during power interrupv
tions is only 50 milliamps at 9 volts.

An option for a plug on the CPU circuit board directly
interfaces this Digital Weather Computer with other
Heath Computers for the purpose of computer as-
sisted research.

Your Digital Weather Computer will provide a vast
amount of valuable weather information, and its
handsome styling will be attractive in any decor.

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I -HEATHKIT

UNPACKING INSTRUCTIONS

Locate the Pack Index Sheet" that is packed inside
the carton. This sheet identifies the location of each
pack. Packs 1, 2. and 3 are in separate compartments
and contain the circuit board parts. The remaining
parts will be considered the final pack,

The Assembly Manual has four (4] Parts Lists, one for
each pack. Each Parts List has its own unpacking
instructions that you should read carefully. Never
unpack more than one pack at a time.

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- - - - - I -HEATHKIT

Front Panel Circuit Board

SWSO? SW508 SW50? SW50!) SW505

PICTORIAL 1-8

Ref to Pictorial 1-8 for the following steps. % Similarly install the eight G-lug pushbutton
J switches [spring return] at locations SW501
) Position the front panel circuit board with the through SW508.

printed side up as shown.

In the following step you will install nine 1N4149
(#56-56] diodes. Be sure to match the band on the

diode with the band on the circuit board. Solder the

lejs to the foil and cut off the excess lead lengths. CIRCUIT BOARD CHECKOUT

Carefully inspect the circuit board for the following
conditions.

( Install the diodes at locations 050] through

0509.

NOTE: When you solder the lugs of the following [ ] Unsoldered connections.
switches to the foil. it is very important that the .
switches are flush against the circuit board. This is to l 1 Poor 501d connections.

make sure the knobs will not bind in the control panel . .
holes when the circuit board is mounted later. ( l 501d bridges between f0 patterns.

[/] Locatethe one fi-lug pushbutton switch (on-off] [ ] Protruding leads which could touch together.

- . ' l ' .
#64 683 install the switch at ocation SWSOQ [ ] Diodes for the correct position of the banded

end.

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Page 38

ML

You will be working with [he left half
of the circuit hoard in HS Pinlurial.

NOTE: Thu [(2 smzkuls lhal yuu will
install in the {allowing steps (:an b:-
inslallud uillmr way in [he (.llellI
bnarrl. Bu sun: 1hr: pins are straight.
insurl the pins inlu lhn hnlus. and sul-
dur thv pins in 1h:- lnil as ynu install
each snuket,

I} 14-pin [(1 socket al Uzuz.

(/lb-pin lC socket m llzuli.
J_

M H-pin 1C suckel al llzull,

[ ] 40-pin [(2 suckal Ell [71:05.

[/im-pin IC socket al ('207.

14-pin |(.Z suckel at 1'2].

Mil-pin |(I socket al 11204.

// \\\\

PICTORIAL 3-4

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-HEATHKIT

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STEP-BY-STEP ASSEMBLY
Front Panel Assembly

Refer to Pictorial 4-1 for the following steps.

Place a Cloth on your work surface where you are
working with assemblies that are painted and could
get scratched.

( l

y l

Position the front block as shown and install the
nameplate with two push-on Speed Nuts.

Install the front block on the front panel with
three #6 X 3/8" sheet metal screws. Center the
block between the sides of the panel before you
tighten the screws.

Refer to Pictorial 4-2 (Illustration Booklet, Page 5) for
the following steps

NOTE: Use the nut starter supplied with this kit to

hold and start 4-40 and 6-32 nuts on screws.

1/), Position the front panel circuit board as shown
and mount L-brackets at D, E, and F with 6-32 x
5/16" screws. #6 lockwashers, and 6-32 nuts.
Do not tighten the hardware at this time.

I

(y Position the trim plate with the groove side up
and slide three 6-32 X 3/8 T-screws in the
groove. Line up the screws with holes A. B, and
C in the front panel and mount the trim plate
and circuit board on the front panel. Use #6
lockwashers and 6-32 nuts. Center the trim
plate on the front panel and tighten the screws
at A, B, and C.

(/ Tighten the L-bracket hardware at D. E. and F.

QM /ne x 3/3"

SHEET
METAL
SCREW

SPE

FRONT BLOCK

NAMEPLATE

PICIORIAL 4-1