General Radio Company - 561-D - Other
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Equipment:
561-D
Date:
1959
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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.
1 Manual
Service and user manual
Manual type:
Service and user manual
Pages:
22
Size:
8.3 MB
Language:
english
Revision:
Manual-ID:
307-K
Date:
January 1959
Quality:
Scanned document, all readable.
Upload date:
Dec. 30, 2016
MD5:
45bbe337-cda8-0abd-2e9a-eb7cfa61ed6e
Downloads:
371