General Radio Company 561-D Other
Manufacturer:
Model:
561-D
Date:
1959
Category:
Group:
Description:
Vacuum-Tube Bridge

Information

The Type 561-D Vacuum-Tube Bridge makes possible the measurement of the low frequency dynamic coefficients of vacuum tubes and transistors over very wide ranges of values, and under a wide variety of operating conditions. The circuits used are such that independent, direct-reading measurements of forward and reverse voltage-amplification factor, resistance, and transconductance can be made quickly and easily. Interelectrode and other stray capacitances are balanced out in such a manner that awkward correction factors, common to most vacuum-tube bridge circuits, are unnecessary. The procedure in making measurements is simple and straightforward, and the three coefficients, voltage- amplification factor, “plate” resistance, and transconductance are obtained by following exactly the same procedure. A three position switch is turned to whichever quantity is desired, multiplier switches are set at the appropriate value, and balance is obtained by adjusting a three-decade attenuator and a variable condenser. At balance the decades read directly, to three significant figures, the quantity being measured. The circuits have large enough current-carrying capacity and sufficient insulation so that low-power transmitting tubes may be tested in addition to receiving tubes and transistors. The measuring circuits and the control portion of the bridge are completely separated, connection between the two being made by a flexible concentric plug-and- jack arrangement. This makes it possible to measure^ conveniently grid circuit parameters, or in the case of multi-element tubes and of transistors, parameters referred to any pair of electrodes. Negative values of the coefficients can be measured directly as readily as positive values, except that in some cases precautions must be taken to prevent dynatron oscillations.

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Service and User Manual
Manual type:
Service and User Manual
Pages:
22
Size:
8.31 Mbytes (8717617 Bytes)
Language:
english
Revision:
Manual ID:
307-K
Date:
1959 01 01
Quality:
Scanned document, all readable.
Upload date:
2016 12 30
MD5:
45bbe337cda80abd2e9aeb7cfa61ed6e
Downloads:
509