power is on. There is also a separate
switch for the lamps, allowing you
to check your rack’s settings before
applying power to it. The lights do not
turn off automatically when the tubes
are pushed in, so be sure to use the
switch.
PL-PLUS
Model PL-PLUS is an enhanced
version of the PL-8. Its front panel
provides a handy display of AC line
voltage by means of a 20 LED bar-
graph meter, reading from 90 to 128
Volts in two-volt steps. The normal
range voltages are indicated in green,
with moderate and extremely high
or low voltages in yellow and red
respectively. Note that the LED meter
continues to read even when the
master switch is off. This was done
purposely to allow you to check the
voltage before powering up. The LEDs
are designed for continuous, ongoing
use. They consume little power, just
a few cents worth per month, much
like a clock. The PL-PLUS features
15 amp capacity, as well as a more
sophisticated RFI lter network with a
greatly improved capacity for stopping
line noise. This lter is a low-pass type,
composed of high-voltage capacitors
and an inductor. It passes the low (50
or 60 Hz) line frequency while rejecting
high frequencies, with maximum
attenuation in the region from 1 to 100
MHz. The PL-PLUS’ voltmeter has a
basic accuracy of +/- 2 volts, (extreme
cold or heat may cause an additional
one volt of error). Should the voltage
reading ever become inaccurate, it can
be easily recalibrated by a qualied
service technician.
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