EUW-20A Servo Recorder

The Heathkit model EUW-20A Servo Recorder offers several unique features found
in no other unit. In normal operations it is a precision laboratory-type
self-balancing potentiometric recorder which can be used to record many phenomena
when connected to a suitable signal source. It is also easily modified for
multi-purpose applications as a servo system.

SPECIFICATIONS
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Chart Paper . . . . . . . . . . . . . . .  Grid Width:  10”
					   Length:  120 foot roll
					   Markings:  0-100, right to left

Chart Speed . . . . . . . . . . . . . . .  2 inches per minute; additional motors
					   for special chart speeds are available from Heath Co.

Chart Span. . . . . . . . . . . . . . . .  Five fixed ranges: 10, 25, 50 100, and 250 mv
					   plus a vernier adjustment between each fixed range,
					   which provided adjustment of span to any value
					   between 250 and 3.3 mv. There is also an EXTERNAL
					   position for special plug-in fixed ranges.

Pen . . . . . . . . . . . . . . . . . . .  Standard fountain pen, cartridge type

Balancing Time	. . . . . . . . . . . . .  0.1 second per inch, 1 second full scale (10”)
					   (50 Hz, 1.5 seconds full scale)

Input Circuit . . . . . . . . . . . . . .  Self-balancing potentiometric on all ranges

Input Resistance. . . . . . . . . . . . .  Essentially infinite at null. Approximately 500kohms off null

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

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

	Linearity . . . . . . . . . . . .  Less than 0.5% full scale

Maximum Recommended
Source Resistance . . . . . . . . . . . .  50 kohms 

Reference Source. . . . . . . . . . . . .  Mercury cell

Reference Cell Life . . . . . . . . . . .  300 hours (approximately)

Accessory Sockets . . . . . . . . . . . .  10 watts mat be drawn from each socket at 120 VAC
					   10 watts mat be drawn from each socket at 240 VAC
					   6.3 VAC at 50 ma may be drawn from accessory 11-pin socket

Power Requirements. . . . . . . . . . . .  120/240 volts 60 Hz; 45 watts
					   (120/240 volts 50 Hz; 50 watts)

Fuse. . . . . . . . . . . . . . . . . . .  1 ampere slow-blow

Dimensions. . . . . . . . . . . . . . . .  13-3/4” wide, 13-3/8” deep, 8-3/4” high

Net Weight. . . . . . . . . . . . . . . .  17 lbs.