Heathkit IG-4244 Quick Start Manual

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SCHEMATIC OF THE
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PRECISION OSCILLOSCOPE CALIBRATOR
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MODEL IG-4244 Sav
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(rOF-5 SELECT?
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2990"
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1, RESISTOR VALUES ARE IN OHMS
({K=1000, M=1, 000, 000),
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2, ALL CAPACITOR VALUES ARE IN UF(MICROFARADS) UNLESS
H OTHERWISE NOTED,
| 3, REFER TO THE CIRCUIT BOARD
X-RAY VIEWS FOR THE PHYSICAL
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LOCATION OF PARTS.
:
H 4,
CIRCUIT COMPONENT NUMBERS ARE IN THE FOLLOWING
GROUPS:
H 1-99 PARTS
ON THE CHASSIS.
H 101-225
PARTS ON THE CIRCUIT BOARD.
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H
5. © INDICATES A LETTERED WIRE CONNECTION ON THE CIRCUIT
BOARD.
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Sees cSt:
H 6. = INDICATES A CHASSIS GROUND,
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H 7. 7 INDICATES A CIRCUIT BOARD GROUND.
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H 8. CD INDICATES A DC VOLTAGE TAKEN FROM THE POINT INDICATED
' TO GROUND
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9. TRANSISTOR TRANSISTOR LOGIC (TTL) LEVELS ARE AS FOLLOWS: eS Bangi PORTION
A LOGIC 0, OR LOW, IS< 0.8 VOLTS. A LOGIC 1, OR HIGH, 1S
>2.0 VOLTS BUT <5.5 VOLTS. A LOGIC
0 CONTROLS SET/RESETS.
10, ECL LEVELS ARE AS FOLLOWS: A LOGIC
0, OR Low, ISS-1.6
VOLTS. A LOGIC 1, OR HIGH, IS >-.9 VOLT. A LOGIC 1
CONTROLS SET/RESETS.
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11. 9 INDICATES A DC VOLTAGE TAKEN FROM THE POINT
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INDICATED TO "'VOLTS' GROUND FLOATING REFERENCE."
Copyright © 1983
All Rights Reserved
Part of 595-2889-08
Printed in the United States of America