EUW-25 DC Oscilloscope

The Heathkit model EUW-25 DC Oscilloscope contains identical DC coupled vertical
and horizontal amplifiers. The negligible phase shift between the two amplifiers
makes the oscilloscope ideal for specialized uses such as computer readout. The
DC coupling in the amplifier channels of the oscilloscope allows it to be used with
signals from over 400 Hz down to DC.

SPECIFICATIONS
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Vertical and Horizontal Amplifiers

Bandwidth . . . . . . . . . . . . . . . .  Dc to 400 Hz (3 db point)

Sensitivity . . . . . . . . . . . . . . .  .1 volt (peak-to-peak) per 1/4” deflection (uncalibrated)

Attenuator. . . . . . . . . . . . . . . .  3-position, compensated

Input Impedance	. . . . . . . . . . . . .  3.6 Mohms shunted by 35 uuf

Gain Control. . . . . . . . . . . . . . .  Continuously variable

Centering . . . . . . . . . . . . . . . .  Any portion of a 2” x 2” trace may be positioned
					   on any portion of the CR tube screen. Panel
					   markings for the centering controls allow for easy
					   beam finding.

Coupling. . . . . . . . . . . . . . . . .  Either AC or DC, selected with the input attenuator switch

Polarity. . . . . . . . . . . . . . . . .  A positive signal applied to the vertical channel causes
					   upward deflection; a positive signal applied to the
					   horizontal channel causes beam deflection to the left

Relative Phase Shift Between. . . . . . .  Less than 5 degrees		 
Channels

Sweep Generator

Recurrent Type  . . . . . . . . . . . . .  Linear sawtooth produced by multivibrator type generator

Sync Provisions	. . . . . . . . . . . . .  Internal or external sync may be switch selected. Sync
					   level is automatically maintained over a range of 1/4”
					   to 2” vertical trace

Sync Polarity . . . . . . . . . . . . . .  Plus or minus sync may be switch selected

Frequency Coverage. . . . . . . . . . . .  5 Hz to 500 kHz in four overlapping ranges. Lower
					   sweep rates may be obtained by adding capacitance
					   to the “External Capacity” binding posts

Blanking. . . . . . . . . . . . . . . . .  Retrace is blanked in conjunction with the internal sweep generator

General

Tube Compliment	. . . . . . . . . . . . .  1 – 3RP1 medium persistence, green phosphor
					   2 – 6AB4 Cathode followers
					   2 – 6BS8 Amplifiers
					   2 – 12BH7 Push-pull deflection amplifiers
					   2 – 12AU7 Sweep multivibrator
					   1 – 6X4 Low voltage rectifier
					   1 – 1V2 High voltage rectifier
					   1 – OA2 B+ voltage regulator
					   1 – OC2 Bias voltage regulator

Front Panel Controls. . . . . . . . . . .  VERTICAL AMPLIFIER – Step Attenuator, Variable Attenuator,
					   Balance, Input Shorting switch, Vertical Positioning
					   HORIZONTAL AMPLIFIER – Step Attenuator, Variable Attenuator,
					   Balance, Input Shorting switch, Horizontal Positioning
					   SWEEP GENERATOR – Coarse Frequency Selector, Fine Frequency Selector,
					   Sync Polarity switch
					   FOCUS
					   INTENSITY – AC switch

Input Connections . . . . . . . . . . . .  Vertical, Horizontal, External Sync, and External Capacity
					   are 5-way binding posts

					   Input to vertical and horizontal deflection plates on rear panel

					   Z-axis input on rear panel, requires 1 to 15 volts for complete
					   blanking, depending upon Intensity control setting

Power Supplies	. . . . . . . . . . . . .  Transformer-operated, fused. B+ supply, full-wave rectifier.
					   High voltage and B- supply, half-wave rectifier. All critical
					   voltages regulated with VR tubes

Dimensions. . . . . . . . . . . . . . . .  9-5/16” wide, 11-9/16” deep, 9-3/8” high

Net Weight. . . . . . . . . . . . . . . .  15 lbs.