English translation — EAI Mitteilungsblatt Nr. 002

This document is an English translation of the original German “EAI Mitteilungsblatt Nr. 002” published by EAI Electronic Associates GmbH, Aachen, August 1965.

EAI Electronic Associates GmbH · 51 Aachen, Martinstrasse 14 August 1965 · No. 002

New address from 1 September 1968: 51 Aachen, Bergdriesch 37 Tel. 0241 / 26041 and 26042

GENERAL ANNOUNCEMENTS

1. Office Expansion

Previous successes have led to a substantial enlargement of the Aachen office as of 1 September 1965. From that date, new modern office and laboratory premises in the Aachen city centre at Bergdriesch 37 are occupied. The new premises permit further expansion of the Customer Service, Applications, Sales, and Administration departments. The telephone numbers remain unchanged: Aachen (0241) – 26041 and 26042.

2. Trade Show Appearances

EAI will exhibit at the following events:

Date	Event
7–11 September 1965	”F.N.E.L.” – Basel, Switzerland
28 September – 5 October 1965	”US-Exhibit,” Stand No. 15
4–8 October 1965	”Nuclear Instruments Show” at the Trade Centre of the United States of America, Frankfurt/Main
13–19 October 1965	”Physiker-Tagung 1965” (Physics Conference), Frankfurt/Main – Hoechst
—	“Interkama 1965,” Düsseldorf

3. Next EAI GmbH Analog Computer Course

Aachen, 20–24 September 1965.

TECHNICAL ANNOUNCEMENTS

1. EAI-8875 Multi-Channel Recorder

Technical Characteristics:

Fully transistorised
12 paper feed speeds from 0.05 to 200 mm/sec
AC/DC writing linearity better than 0.5% of full deflection
Completely rectilinear recording
Outstanding “Forced-Fluid” pressurised ink writing system (see figure) ensures clean and reliable recording
Unmatched dynamic behaviour (see amplitude/frequency curves)
Electronic protection against amplitude and frequency overload
Remote control of operating modes and paper feed speed is possible
2 additional timing marker channels (internal/external)

A detailed data sheet Mk AC 65030 will be sent on request.

Amplitude/Frequency Response (from curves):

40 mm pen motor: amplitude up to approximately 100% across the frequency range, rolling off above ~50 CPS for 40 mm, and above ~30 CPS for 16 mm deflection
80 mm pen motor: similar characteristic with correspondingly reduced bandwidth at larger deflections

System Configurations:

The EAI-8875 System is available in three configurations:

Model 8875-8 — 8-channel recorder (eight 40 mm channels)
Model 8875-6 — 6-channel recorder (four 40 mm channels and two 80 mm channels)
Model 8875-4 — 4-channel recorder (four 80 mm channels)

2. NEW — Electronic Mode Control (EMC) for TR-48/58

As an additional option, the EAI analog computer PACE, Type TR-48/58, can now be equipped with Electronic Mode Control (EMC).

The standard integration networks, Type L2.764, are replaced by EMC integration networks, Type 12.L322. A minor wiring modification to the basic console is also required.

3. NEW — Expansion of TR-48/58 Computing Capacity

Various coefficient potentiometer/limiter plug-in module combinations are now available for expanding the computing capacity of the TR-48/58 (see price change list).

4. Type 1026.003 — Transistorised Digital Multimeter

Fully transistorised; suitable for measurements of DC voltage, AC voltage, and resistance. Conversion time is less than 10 ms (without sign change). A single measurement is triggered by a pushbutton on the front panel. Symmetric and asymmetric input, the latter floating up to 500 V DC.

DC Voltage: 5 ranges: 0 to ±0.1099 V, ±1.099 V, ±10.99 V, ±109.9 V, ±1099 V. Input impedance: 10 MΩ on the lowest range, otherwise over 10 MΩ. Accuracy: ±0.1% of full scale or ±1 digit, except on the lowest range where it is ±0.25% of full scale.

AC Voltage: 4 ranges: 0 to 1.099 V, 10.99 V, 109.9 V, 1099 V. Ranges calibrated in RMS. Accuracy: 0.2% of full scale or ±2 digits for frequencies from 25 Hz to 2.5 kHz. With reduced accuracy, the instrument can be used from 2.5 kHz to 25 kHz. Input impedance of the lowest range is greater than 50 kΩ.

Resistance: 1 kΩ to 10 kΩ, 100 kΩ, 1 MΩ, 10 MΩ. Accuracy: 0.1% of full scale.

Supply voltage: 110/220 V at 50/60 Hz.

PRICE CHANGES

I. TR-20 Desktop Analog Computer — Price List 1965 Feb. No. 20-P007

Item	Description	Undutiable DM Price	Dutiable DM Price
Pos. 8	Electronic Multiplier, Type 7.045	1,735.–	2,045.–
Pos. 10a	High-accuracy Multiplier, Type 7.137-0	2,655.–	3,130.–

II. TR-48 Analog Computer — Price List 1965 Jan. No. 48/58-P003

Item	Description	Undutiable DM Price	Dutiable DM Price
Pos. 1a	TR-48/58 Console, EMC Modification	1,800.–	2,120.–
Pos. 3	Quad DC Computing Amplifier, Type 6.704-0	3,105.–	3,660.–
Pos. 3a	Broadband Dual DC Computing Amplifier, Type 6.614	1,870.–	2,200.–
Pos. 6	Multiplier, Type 7.096 — discontinued	—	—
Pos. 7	Multiplier, Type 7.099	1,780.–	2,095.–
Pos. 7a	High-accuracy Multiplier, Type 7.117	2,680.–	3,155.–
Pos. 24a	EMC Dual Integration Network, Type L2.1322	3,780.–	4,455.–
Pos. 22	Potentiometer Group, Type 2.440, comprising: 1× potentiometer unit with 5 potentiometers, Type 42.291; 1× programming unit, Type 42.283 (with 1 plastic patch panel and contact springs)	1,515.–	1,785.–
Pos. 30a	Limiter/Potentiometer Group, Type 2.781, comprising: 1× potentiometer unit with 5 potentiometers, Type 42.291; 1× dual limiter plug-in module, Type 16.318 (as programming plug-in with 1 plastic patch panel and contact springs)	1,780.–	2,100.–
Pos. 30b	Dual Limiter Plug-in Module, Type 16.318	745.–	880.–

III. Recorder — Price List 1965 No. VAR-REC-P001

Item	Description	Undutiable DM Price	Dutiable DM Price
Pos. 1	EAI 4-Channel Recorder, Model 8875-4	47,700.–	56,180.–
Pos. 2	EAI 6-Channel Recorder, Model 8875-6	48,825.–	57,510.–
Pos. 3	EAI 8-Channel Recorder, Model 8875-8	49,950.–	58,830.–

DID YOU KNOW…?

That EAI has compiled a series of application examples covering analog computers in the most diverse fields of industry and research? The titles of these so-called “Application Studies” are summarised in a reference list available on request. Studies of interest will of course be sent free of charge.
That EAI recently published a “Handbook of Analog Computing”? This book, written in English, covers on approximately 400 pages the construction, applications, and special capabilities of analog computers and is priced at DM 45.–.
That it is possible to purchase so-called “Class B” analog computers from EAI? These units of types TR-48, TR-20, and TR-10 come from computing centres in the USA where they have been in use for some time and are offered to interested parties at a reduced price. EAI’s normal delivery and warranty conditions also apply to Class-B computers.
That it is now possible to acquire EAI PACE analog computers not only by direct purchase but also on a hire-purchase (leasing) basis. Additionally, such a unit can be rented for a desired period. EAI will be happy to propose advantageous arrangements.
That EAI has compiled a new brochure on data acquisition and processing systems and their components? Both analogue and digital units that can be interconnected into systems or used individually are listed and described therein.

PDS 1020 — New Digital Computer

EAI, for many years a leader in the field of analog computing, considers this general-purpose digital computer to close a gap in the existing market. The following specifications illustrate this clearly:

Input:

Paper tape reader: 50 characters/sec
Direct keyboard input device

Output:

Paper tape punch: 50 characters/sec
Electric typewriter: 15 characters/sec

Memory:

Magnetostrictive delay-line memory (basic configuration): 2,048 words, expandable to 4,096 words × 16 bits plus sign and parity bits

Word Length:

Variable: 4, 8, 12, 16, 24 digits plus sign

Operating Times:

Addition and subtraction: 9.2 ms (average)
Multiplication and division: 45.2 ms (average)

General:

Interpreter: special “programming language” containing floating-point arithmetic, special functions such as sin, cos, square root, exp, ln, arctan, etc.
Machine language includes instructions for binary and decimal arithmetic, address arithmetic, binary and decimal shifting, logical tests
4 switches for program branching, expandable to 8 switches
Decimal arithmetic
Temperature range: 10°C to 50°C
Desk-top size, mobile
220 V, 50 Hz

Such a digital computer, costing less than DM 100,000 in the standard configuration, is precisely the right tool at the engineer’s workplace in research and industry, for lecturers and students at universities and technical colleges — everywhere where tasks arise that must be solved immediately on-site. A cross-section of typical application areas of the PDS 1020 bears this out:

Linear programming
Matrix calculations
Geodesy
Cartography
Trajectory calculations
Process monitoring
Control loop analysis
Heat transfer
Spectral analysis
Monte-Carlo modelling
Meteorological studies
Statistics
Force determination
Academic purposes

A special development of the PDS 1020 is the process computer PDS 1068, which serves for the monitoring and control of industrial manufacturing processes.

Hybrid computing systems result from combining the PDS 1020 with EAI PACE analog computers.

By including the digital computer PDS 1020 in EAI’s product range — which encompasses analog computers, X-Y recorders, digital-to-analogue converters (data plotters), digital voltmeters, special digitising systems, digital-analogue converters, etc. — a complete spectrum of modern electronic data-processing equipment is available.

EAI is ready to demonstrate the PDS 1020 and would be pleased if it could contribute to the solution of problems encountered.

Responsible for content: EAI Electronic Associates GmbH, 51 Aachen, Martinstrasse 14. Tel. 26041/42

EAI Newsletter No. 002 — August 1965

EAI NEWSLETTER