Heathkit IG 4244 Schematic 2

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Part of 595-2889-08

SCHEMATIC OF THE
HEATHKIT
PRECISION OSCILLOSCOPE CALIBRATOR
MODEL IG-4244

NOTES:
1. RESISTOR VALUES ARE IN OHMS (-1000, M-l,000,000I.

2. ALL CAPACITOR VALUES ARE IN uFIMICROFARADSI UNLESS
OTHERWISE NOTED.

3. REFER TO THE CIRCUIT BOARD X-RAY VIEWS FOR THE PHYSICAL
LOCATION OF PARTS.

4. CIRCUIT COMPONENT NUMBERS ARE IN THE FOLLOWING GROUPS:

1-99 PARTS ON THE CHASSIS.
101-225 PARTS ON THE CIRCUIT BOARD.

s. O INDICATES A LETTERED WIRE co~~scno~ on THE CIRCUIT
BOARD.

6. ? INDICATES A CHASSIS GROUND.
7. v INDICATES A CIRCUIT BOARD GROUND.

8.C:)I~0ICAT£5 A DC VOLTAGETAKEN FROM THE POINTINDICATED
T0 GROUND.

9. TRANSISTOR TRANSISTOR LOGIC (TTLI LEVELS ARE AS FOLLOWS:
A LOGIC 0. 0R LOW, IS< 0.8 VOLTS. A LOGIC 1. 0R HIGH, IS
>2.0 VOLTS BUT (5.5 VOLTS. A LOGIC 0 CONTROLS SET/RESETS.

10. [CL LEVELS ARE AS FOLLOWS: A LOGIC 0, OR LOW, IS<-I.6
VOLTS. A LOGIC 1, 0R HIGH, IS >-.9 VOLT. A LOGIC I
CONTROLS SET/RESETS.

ll. * INDICATES A DC VOLTAGE TAKEN FROM THE POINT
INDICATED T0 "'VOLTS' GROUND FLOATING REFERENCE. "

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