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General
The Type 180A may be operated in any normal indoor
location, or in the open if protected from moisture. If the
instrument has been exposed to dampness, it should be
left in a warm room until thoroughly dry before being
placed in operation. Operation of the controls also helps to
keep the contact surfaces of the switches free from an
accumulation of dirt and tarnish.
Cooling
A fan maintains safe operating temperature in the Type
180A Time Mark Generator by circulating air through a
filter and over the components. Therefore, the instrument
must be placed so that the air intake is not blocked. The
air filter must be kept clean to permit adequate air circula
tion. If the interior temperature should rise too high, for
some reason, a thermal cutout switch will disconnect the
power and keep it disconnected until the temperature drops
to a safe value.
INSTRUCTIONS
For proper air circulation, the bottom and side panels
must be in place. Be sure the bottom panel is installed
according to directions.
Power Requirements
A metal plate is attached to the back of your instrument
showing the input voltage for which the instrument was
originally wired. The regulated power supplies in the Type
180A will operate with line voltages from 105 to 125
volts at 117 nominal line volts, or from 210 to 250 volts at
234 nominal line volts. Proportionate line voltage variations
apply when other nominal line voltage primary connections
are made. For maximum dependability and long life the
voltage should be near the center of this range. Fig. 2-1
shows the connections for the various line voltages.
Voltages outside of these limits, or poor line-voltage
waveforms, may cause hum or jitter on the trace and may
cause unstable operation. Be sure to check for proper line
voltage if indications such as these are present.
SECTION 2
OPERATING
2-1
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