Heathkit EUW 20A Schematic

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HEATH

SPECIFICATIONS

Chart Paper. .

ChartSpeed....,,,.....,...........

ChartSpan

Pen

Balancing Time. . .............. . . . . . .

InputCircuiL. ......

hputResistance......................

OverallError............. ...........
DeadZone.......................
Linearity........... .............

Maximum Recommended Source Resistance. . . .
Reference Source. .
ReferenceCellLi-fe...................

Accessory Sockets, . . . . . . . . . .........

PowerRequirements..................

Fuse. .....

Dimensions. . . . . . . . . .
NetWeight.......
Shipping Weight. . . . . . . .

Grid Width: 10"
Length: 120 foot roll,
Markings: 0-100, right to left.

2 inches per minute; additional motors for
special chart speeds are available from Heath
Company, see Page 20.

Five fixed ranges: 10, 25, 50, 100, and 250 mv;
plus a vernier adjustment between each fixed
range, which provides adjustment of span to any
value between 250 and 3,3 mv, There is also an
EXTERNAL position for special plug-in fixed
ranges.

Standard fountain peny cartridge type.

0.1 second per inch, 1 second full scale (10").
(50 cps, 1.5 seconds full scale).

Self-balancing potentiometric on all ranges.

Essentially infinite at null,
500 Km ofl null,

Approximately

Less than 1% of full scale from 10 to 250 mv.
Less than 0.5% of full scale from 10 to 250 mv.
Less than 0.5% full scale.

50 K9.

Mercury cell.

300 hours (approximately).

10 watts may be drawn from each socket at 120
V AC. 10 watt total may be drawn at 240 V AC.
6.3 V AC at 50 mamaybedrawn from the acces-

sory 11-pin socket,

120/240 volts, 60 cps; 45 watts.
(120/240 volts, 50 cps; 50 watts.)

1 ampere slow-blow,

18-3/4 wide x 8-3/ " high x13-3/8" deep.
17 lbs.
20 lbs.

All prices are subject to change without notice.
The Heath Company reserves the right to discon-
tinue instruments and to change specifications at

any time without incurring any obligation to
incorporate new features in instruments pre-
viously sold.

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CALIBRATE

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NOTES:
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SI = RANGE SWIYCH 5 500 MA
52 = PWER SWITCH swam
in chES IN STANDBY RosITION man:
523, n, E, r CLOSES IN SERVO POSITION
sac CLOSES IN CHART POSITION
H-PIN AcCEssonv SOCKET VIEWED FROM INSIDE CHASSIS
ALL RESISTORS ARE I/z WAYT uNLEss SHOWN OTHERWISE. J-
ALL RESISTOR VALuEs ARE IN n, I K = Iooo n, I MEG = I.m,ooo a. 47 J
HUM 52"
ALL CAPACITOR VALUE: ARE IN ma. GRN AN 5 9 9

ImICATEs A VOLTAGE MEAsuREMENT FROM POINT u 200
INnICATEn 1D CHASSIS EXCEPT FOR Ac VOLTAGES VAc SWPE
ON THE POWER TRANSFORMER. C
WHY 3
VOLTAGE READINGS TAKEN WITH AN II MEGOHM INPUT 4 . 5 4
vrvu WIYH THE CIRCUIT CONNECTED As swan INPUT I2Ax7 IzAxT
SHORTED. SYSTEM BALANCED, sERvo PWER ON. TRANSFORMER 53' G

47