Analog Computers

English translation

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Electronic Resolver ERV 801 — Operating Instructions for Interconnection with the Desktop Analog Computer RA 742

This document is an English translation of the original German-language Bedienungsanleitung (operating instructions).

General

The Electronic Resolver ERV 801, as an expansion for the desktop analog computer RA 742, has its own power supply unit and a separate housing. The connection to the desktop computer is made via a parallel cable (order no. 55-3046.704-00) through the left or right parallel-bus connector of the computer.

All amplifiers of the ERV 801 can be nulled via the measurement amplifier of the computer and connected to the control instrument via the selector buttons.

Amplifiers 02, 03, 04, and 05 are free amplifiers of the resolver in all operating modes; they each have one input with a weight of 1, one summing-point input, and one output jack.

Programming of the ERV 801 is carried out on the small programming panel of the insert (Figure 1).

The meaning of the jacks is explained for the various operating modes.

In general: The dark-red jacks always carry the reference voltage +10 V; the blue jacks carry the reference voltage -10 V.

The violet jack M is the output of the measurement lead, to which the amplifier outputs are switched by pressing the corresponding button. (Only one button may be pressed at a time.)

The six white Q-jacks provide six cross-connections to the desktop computer, on the right or left side of the programming panel, depending on how the right or left parallel-bus connector is wired.

The black jack on the small programming panel is the computing ground.

The four white jacks at the lower left of the programming panel are interconnected and can be used for branching.

Operating Modes

The operating mode is selected via the four buttons in the left section of the insert.

[>]  [M, D-]  [->x,y]  [->R,theta]

Mode 1 — Use of Amplifiers as Inverters (Button 1: [>])

When none of the four operating-mode buttons is pressed, the lamp of the first button (with the amplifier symbol) is illuminated.

In this position all amplifiers are accessible as free inverting amplifiers: 01, Theta, A, B, R1, R2, 02, 03, 04, and 05.

Amplifiers 01 and Theta each have one input with weight 1, one summing-point input, and two amplifier output jacks.

Amplifiers A, B, R1, and R2 are pure inverters; the inputs are the ”+” jacks, the outputs the ”-” jacks. The output jacks (”-” jacks) differ in color — instead of orange they are green, because in the coordinate-converter operating mode they serve as input jacks.

Mode 2 — Multiplier (Button 2: [M, D-])

In this operating mode two multipliers are available, each with two products. The first multiplier forms the product of the amplifiers:

  • 01 x A, and
  • 01 x B

The second multiplier forms the product of:

  • Theta x R1, and
  • Theta x R2

All factors must be patched with only one sign, since amplifiers 01, Theta, A, B, R1, and R2 serve as inverting amplifiers. The outputs of these amplifiers can, if needed, additionally be used for further programming.

The outputs of the multiplier networks -X1, -X2, +Y1, and -Y2 are arranged so that they can be connected directly to the summing points of the free amplifiers 02, 03, 04, and 05 via short-circuit plugs. The sign-correct product appears at the output jacks of these amplifiers.

Mode 3 — Conversion from Polar Coordinates to Cartesian Coordinates (Button 3: [->x,y])

For this operating mode the input jacks are in the left half of the two middle rows. The voltage corresponding to the angle (-10 V corresponds to -180°, +10 V corresponds to +180°) is applied to the input with weight 1 of amplifier Theta.

For a given angle, polar coordinates with two different magnitudes R1 and R2 can be simultaneously converted. The magnitudes must be applied at both sign jacks (amplifier outputs).

The Cartesian coordinates of R1 appear at jacks -X1 and +Y1, and those of R2 at jacks -X2 and -Y2, with the signs indicated. These jacks are outputs of the multiplier networks and can be directly switched to the summing points of free amplifiers 02 to 05 via short-circuit plugs.

At jacks +A and -A as well as at jacks +B and -B, the sine and cosine respectively of the entered angle Theta are available with both signs at low impedance (amplifier outputs) for further programming.

Amplifier 01 is available as a free amplifier in this operating mode.

Mode 4 — Conversion from Cartesian Coordinates to Polar Coordinates (Button 4: [->R,theta])

In this operating mode the inputs and outputs are in the lower two rows of the programming panel.

The Cartesian coordinates x and y must be fed from amplifier outputs at both signs to jacks +X, -X, +Y, and -Y.

The voltage for the angle (-10 V corresponds to -180°, +10 V corresponds to +180°) appears at the orange jack Theta at low impedance (amplifier output).

For the magnitude, the output of the multiplier network is available at the white jack R. It can be further programmed to the summing point of a free amplifier 02, 03, 04, or 05.

When the magnitude is 0 (x = y = 0), the angle is indeterminate. The servo loop may oscillate, which can be heard as the reset relay switching.

[Translation covers the first 7 pages (complete document); the original is fully translated.]