Simpson 1000 - Page 4

GENERAL DESCRIPTION
SECTION I
GENERAL DESCRIPTION
The Simpson Tube Tester Model 1000 is a Plate Conduct-
ance type instrument which incorporates many new and
practical ideas. and circuits into its handsome case, It may
be used as a portable instrument, or it may be used as a
counter model when the top is removed. It has ten tube
sockets into which you will place tubes for testing. There
is a correct socket for any receiving tube, whether it is old:
or new, and whether it is standard size, miniature, or sub-
miniature.
PLATE CONDUCTANCE
Plate conductance measurements are dynamic tests which
indicate, in each test, a combination of the ability of the
cathode to emit electrons, of each grid to affect the plate
current in its proper manner, and of the plate to receive the
regulated current. If there are no grids (such as in diodes
and rectifiers), the measurément is a simple emission test.
The control settings on the roll chart indicate the position
of each knob and switch on the panel to establish a com-
bination of voltages and meter sensitivity which will cause
correct evaluation of the tube under test. Tube character-
istic data is consulted to find the best voltage combination
to use for each test. From this, the control settings are
determined to place the proper filament, grid bias, screen,
suppressor, and plate voltages at the proper tube socket
terminals for the tube under test.
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