Simpson 1000 - Page 25

OPERATING INSTRUCTIONS
APPLY TUBE TEST
Press the TUBE TEST button, and read the value of tube
quality of the meter. If the tube is a diode or rectifier, read
the arc marked DIODES GOOD. When the emission is below
standard or there are poor element connections the meter
pointer will indicate a value to the left (below) the GOOD
area, If the emission and element connections are satis-
factory, so all the elements perform their proper functions,
the pointer will indicate in the GOOD area. 3
Any tube other than a diode or rectifier will indicate a per-
centage of its rated PLATE CONDUCTANCE on the upper
arc of the meter. To help you quickly judge the tube quali-
ty, there is a scale with colored sections which are related
to the percent of Plate Conductance. If the meter indicates
that the Plate Conductance is 85% or more of the amount it
should be, the pointer will indicate in the heavy green area
labelled GOOD. Readings from 70% to 85% measure FAIR
in the light green area.
The light red area marked WEAK corresponds to readings
from 55% to 70%. Readings below 55% show in the heavy
red area labelled REPLACE. These indications will assist
you and your customers to decide whether or not a tube will
be placed back into service, or if it must be replaced with
a new tube.
AFTER EACH TEST
After you complete the tube test, press the red RELEASE
push button to restore all the black push buttons to their up
position. If there is a second section or condition to be
tested in the same tube, this will be shown in the chart
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