Heathkit IG 4244 Schematic

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20H OSCILLATOR

/ (-0) Ho) HO) (HO) (-2- I0) (é ID) I-IOI
95V QSV 95V V 1'5V +5V *SV +5V

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E i J-LM 3 : SCHEMATIC OF THE
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E ; J L I I PRECISION OSCILLOSCOPE CALIBRATOR
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| M (I-OF-s SELECT)
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: I NOTES:
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' : 1. RESISTOR VALUES ARE IN OHMS (IL-1000, M-I,ODo,oooI.
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: I 2. ALL CAPACITOR VALUES ARE IN uFTMICROFARADSI UNLESS
' 1' -5, m m, I OTHERWISE NOTED.
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c1» -5v I
3 n . no (+2» I 3. REFER To THE CIRCUIT BOARD X-RAY VIEWS FOR THE PHYSICAL
' I LOCATION OF PARTS.
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: m : 4. CIRCUIT COMPONENT NUMBERS ARE IN THE FOLLOWING GROUPS:
333.23. I 1-99 PARTS ON THE CHASSIS.
\0-6 443-019 I 101-225 PARTS ON THE CIRCUIT BOARD.
I
. "o 3 $5 I 5. Q INDICATES A LETTERED WIRE CONNECTION ON THE CIRCUIT
' 7.9 (woman).I 2 ' BOARD.
I J , A -5v I'INNIBITS (ow
I O-()» . _ _ I
: E9 25%; ° 3"" I 6. ? INDICATES A CHASSIS GROUND.
| 2- 71 III R I
: m m: 0.5, O The» m «mews :"JPE'ATEIESI } 7. V INDICATES A CIRCUIT BOARD GROUND.
' I
g m I 8.( )INDICATES A DC VOLTAGE TAKEN FROM THE POINT INDICATED
. no: vow-on t g? n" or : T0 GROUND.
I (mmaon Posmon gmswm '
0, MW 2L 7 9. ZnggllcSLOR LRANSISTO rm . . 0 Low. IS 0.8 VOLTS. A LOGIC I.OR HIGH, IS
fofl -0 Wm ; >2.D VOLTS BUT (5.5 VOLTS. A LOGIC o CONTROLS SET/RESETS.
' ID. ECL LEVELS AREAS FOLLOWS: A LOGIC 0. OR Low, IS<-I.6
M VOLTS. A LOGIC 1, OR HIGH. IS >-.9 VOLT. A LOCIC I
m CONTRDLS SET/RESETS.
mm, am 11. :1: INDICATES A DC VOLTAGE TAKEN FROM THE POINT
«7.2., INDICATED To "VOLTS' GROUND FLOATING REFERENCE."
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ume CH7
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PM or mun:
SWITCN($WIOI)

SCHEMATIC OF THE
HEATHKIT

PRECISION OSCILLOSCOPE CALIBRATOFI

MODEL IG-4244

NOTES:

5.

6.

7.

RESISTOR VALUES ARE IN OHMS IK=1000. M=1,000,000I.

ALL CAPACITOR VALUES ARE IN uFIMICROFARADSI UNLESS
OTHERWISE NOTED

REFER TO THE CIRCUIT BOARD X-RAY VIEWS FOR THE PHYSICAL
LOCATION OF PARTSI

CIRCUIT COMPONENT NUMBERS ARE IN THE FOLLOWING GROUPS:
1~99 PARTS ON THE CHASSIS,
101-225 PARTS ON THE CIRCUIT BOARD.

O INDICATES A LETTERED WIRE CONNECTION ON THE CIRCUIT
BOARD

; INDICATES A CHASSIS GROUND.

v INDICATES A CIRCUIT BOARD GROUND.

8. C) INDICATES A DC VOLTAGE TAKEN FROM THE POINT INDICATED

10.

11.

TO GROUND

TRANSISTOR TRANSISTOR LOGIC (TTLI LEVELS AREAS FOLLOWS:
A LOGIC 0, 0R LOW IS< 0.8 VOLTS. A LOGIC I, OR HIGH, IS
>Z.0 VOLTS BUT (5.5 VOLTS, A LOGIC 0 CONTROLS SET/RESETS.

ECL LEVELS ARE AS FOLLOWS: A LOGIC 0, OR LOW, IS<>L6
VOLTS. A LOGIC 1, OR HIGH, IS>~-9 VOLT. A LOGIC 1
CONTROLS SET/RESETS.

* INDICATES A DC VOLTAGE TAKEN FROM THE POINT
INDICATED TO "VOLTS GROUND FLOATING REFERENCE."

Copyright © 19
Heath Company
All Rights Reserved

Pan of 595-2889-08 Puma in ma Unned States aim