303B English

Dear customer!

We welcome you to the purchase of the equipment of our production described below, which you have acquired with a device that has found its way into the scientific and industrial world not only in the field of electrical engineering through its manifold application in lobaratories and test fields It is meant to be of help to you at work and to contribute to the faster resolution of problems we are constantly striving to adapt our equipment to the state of the art and therefore would appreciate it if you tell us your experience and your wishes In this manual we have tried to show you some circumstances that may affect the proper operation of our device by diminutive influences, but if there are any disturbances that can be traced back to the device itself, then please do not hesitate to contact us please contact our customer service.

We always strive to remedy any shortcomings you may have.

To conclude, we would like to draw your attention to our further production program of electronically stabilized DC and AC regulators as well as electro-metric meteors. Please have a look at our information material.

In our custom manufacturing department you have the opportunity to consider your specific requirements in the execution of electronically stabilized power supply units and melter boxes.


The electronically stabilized DC voltage regulator, independent of mains voltage fluctuations and load changes, provides constant ę DC voltages for the power supply of electrical and electronic devices. These voltages are freely adjustable, so that universal usability is possible. The Gerdt also have the most common heating voltages, but they are unstabilized. Possible applications are found in all research and development laboratories, in particular in modern electronics as well as in repair and production facilities.



(see Fig. 1 and 2)

The Gerdt is built as a slot and can thus be used in housings and racks. The dimensions correspond to the TGL 200-7094. The individual subassemblies are predominantly constructed on printed circuit boards 90x150 mm, which are connected to the Gerdt by means of 24-pin plug connectors (TGL 200-3604). The power is supplied to the module via a 16-pin male connector (TGL 10395), and the connector is connected via a 2-pin electronic connector with protective contact.

On the right side of the front panel there are power switches S1, mains fuse Si 1 and mains glow lamp GI1 fiii the primary circuit of the network transformer. In addition, the protection Si2 for the magnetic voltage stabilization of the internal tubular heating and the fuses Si4 to Si7 for the secondary circuits lie. The built-in voltmeter Ms2 indicates the voltage set by the step switch S2, the fine controller Rw8 and the zero point correction controller Rw7 and connected to the output terminals Hii19 to Hii22. The clamps H019 and Hu20 as well as Hii21 and Hu22 are connected in parallel to expand the connection possibilities. The current drawn here is indicated by the built-in milli-meter Ms1.

In addition to the output terminals described, the switch S5 is angcordnet, with which the voltage applied there can be switched off. The device will remain ready for operation and the set voltage will be indicated by Ms2. In the event of short circuits and excess current drawn by consumers connected to this output, the applied voltage is automatically switched off and this process is indicated by the illumination of the lamp La1. After elimination of the disturbance, the voltage can be switched on again by briefly pressing the Ta1 key. With the controller Rw1, the switch-off point of the overcurrent protection can be continuously increased from 30. , , 330 mA can be set.

Two auxiliary devices can be operated in parallel via the auxiliary plug connection Hu6 to Hii8.

As additional direct voltages, 0 ... 150 V are available at terminals HG17 and Hu18 and 0 ... 15 V at terminals Hii16 and Hii18. The erstge-called voltage is adjustable by the Reglcr RwlO and the latter by the controller Rw9. At the terminals Hii9. , , Hii14 can reduce the AC heating voltages


become. If the current is drawn via the terminal zero Hii9, the heating coil is protected against overload by the fuse Si3. On the left side of the front panel, the ground terminal Hu15 is arranged. To remove the insert from the housing it is sufficient to loosen the four screws arranged next to the handles.


The secondary voltage of the power transformer Tr2 is through silicon diodes D3. , , D6 in Briickenschaltung equal-directed and after sieving the four parallel connected Endpentoden Rd1 ... RÓ4 (EL 34) zugefuhrt. Its screen grid voltage is taken from a separate winding of Tr2 followed by a one-way direction through a silicon diode D1. These rdhren form a series resistor to the consumer whose size is controlled by an amplifier consisting of the Rdhre Ró5 (ECC 85). The output voltage of the device is fed via a voltage divider to the grid of a system of the tube RÓ5 and here compared with the burning voltage of the stabilizer tube Róó. In the case of mains voltage fluctuations and load changes, a control graph thus arises which, via the amplifier, forms the lattices of the tubes Rd1. , , Rd4, which counteracts change. The ammeter Ms1 is incorporated in the circuit so that the voltage drops occurring at its internal resistance, which become noticeable in the event of load changes, are still detected by the controller. The load circuit contains a low-resistance rotary resistance Rw1 whose load-dependent voltage drop serves to control the excess current fuse. This makes it possible, the current drain of 30. , , 330 mA adjustable to limit.

With the rotary switch S2, the anode voltage can be varied at the power transformer Tr2. Also by S2 and Rw8, the grid voltage of RÓ5 is controlled so that the output voltage at the terminals Hii19 20, Hu21 22 in three stages and in these, with the fine controller Rw8 over-lappable, in the range of 0. , , 300 V is adjustable. The adjustment knob Rw7 is used to correct the zero point. In order to be able to set this voltage under 150 V to 0 V, an auxiliary voltage, which must also be stabilized, is necessary in the magnitude of 150 V. For this reason, a second review