English translation
Technical Information No. 2209: Transistor Computing Amplifier TRV-1
This document translates the original German text (Technische Information Nr. 2209, Transistor-Rechenverstärker TRV-1, published by GTE Technische Elektronik, Ulm-Donau).
Cover Page
TECHNISCHE INFORMATION NR. 2209
Transistor-Rechenverstärker TRV-1 (Transistor Computing Amplifier TRV-1)
Key Features:
- High null-point stability through chopper stabilization with a mechanical 400 Hz chopper and drift-free auxiliary amplifiers.
- Low power input, resulting in minimal self-heating.
- Output overload- and short-circuit-safe, thus providing high operational reliability.
- Built-in overdriving indicator.
- DC voltage amplifiers and auxiliary amplifiers implemented in printed circuit technology. Possibility of arranging amplifier cards in magazine (rack) configuration.
Descriptive Text
The transistor amplifier TRV-1 is a null-point-stable DC amplifier of high gain, intended for precision analog computing and measurement applications. In combination with suitable passive networks — for example GTE operational units — it serves to implement the various mathematical and metrological operations.
Drift stabilization by means of a mechanical chopper and highly stable auxiliary amplifiers ensures extremely low null-point error. This makes the amplifier suitable for long-duration integration and storage purposes.
Silicon transistors and special circuit measures in the output stage protect the amplifier output not only against short-circuit but also against supply voltages of up to ±10 V (machine supply voltage).
With an integrated display amplifier, the operating state of the amplifier can be made visible via a relay with signal lamp.
Technical Data
(Note: Pages 1–18 of this 20-page scan contain unreadable scan artifacts; the technical data below is transcribed from page 20.)
| Parameter | Value |
|---|---|
| DC gain of main amplifier | 115 dB |
| DC gain of auxiliary amplifier | 66 … 70 dB |
| Loop gain (with 200 kΩ feedback resistance) | |
| — at f = 0 Hz | ≥ 160 dB |
| — at f = 50 Hz | ≥ 80 dB |
| Input resistance at f = 0 Hz | 100 kΩ |
| Input resistance at f = 50 Hz | ≥ 10 kΩ |
| Dynamic errors as inverter (200 kΩ – 200 kΩ): | |
| a) Amplitude error at f ≤ 50 Hz | ≤ 0.02 % |
| b) Phase error at f ≤ 50 Hz | ≤ 10⁻⁴ |
| Long-term drift referred to amplifier input | ≤ 20 μV |
| Temperature drift referred to amplifier input (0° to 45 °C ambient temperature) | ≤ 1 μV/°C |
| Output capability up to 10 kHz at 1 kΩ | ± 10 V |
| Noise at output | ≤ 2 mV (rms) |
| Recovery time after overdriving | ≤ 2 s |
Supply Voltages:
| Supply | Value |
|---|---|
| One stabilized, low-impedance voltage pair | ± 15 V / 14 mA |
| Auxiliary voltage | −22 V / 2.2 mA |
| 400 Hz rectified voltage | 7 V₀₀ / 100 mW |
| 400 Hz rectified voltage | 10 V₀₀ / 10 mW |
| Relay voltage | 25 V / 10 mA |
Suitable power supplies for four, 25, and more amplifiers are available on request.
Mechanical Data:
| Parameter | Value |
|---|---|
| Dimensions of printed amplifier card | 155 × 105 mm |
| Minimum spacing between two amplifier cards in magazine | 17 mm |
Subject to change without notice.
Published by: H. O. Goldmann, Dipl.-Ing., Technische Elektronik (79) Ulm-Donau, Rosensteinweg 15, Telefon 67504, Ortskennzahl 0731