The 7.5-foot, three-conductor power cord supplied with the 4077
plugs into the rear AC POWER CONNECTOR. The offset pin on
the power connector is ground. THE INSTRUMENT MUST BE
PROPERLY GROUNDED. Tosafely operate from a
two-contact
outlet, use a 3-prong-to-2-prong adaptor and connect the green
pigtail on the adaptor to earth ground.
Since the presence of
electrical noise
can affect the ultimate
integrity of your data, the noise level should be suppressed as
much as possible. In particular, care should be taken to avoid
utility-line problems that can interfere with or possibly even
damage sensitive microprocessor-based equipment. Such noise
can also be generated by electrical motors, relays, and motor
control devices.
While your 4077 has internal circuitry to protect it from overvoltage
transients and mild EMI, a clean line is still very desirable. No
protection is provided against dropout longer than 8 milliseconds or
brownout below 90 volts. Depending on your line conditions, a
number of protective devices are available (isolators, regulators,
uninterruptible power supplies, etc.).
2.DCOperation
When ordered with the "V" (
Vehicle
) option, a 4077 may be
operated from nominal 12 V-DC (30 W maximum). The actual
tolerance range is 11-18 V-DC.
As shown in Fig. 2(b), every "V"-version 4077 is equipped with a
screw-terminal DC POWER CONNECTOR on the rear of the unit.
Be sure to connect the
positive, negative,
and
ground
lines from
your external DC source to the proper terminals of this connector.
Although all "V" units are protected against accidental polarity
reversal, they naturally will not work under that condition.
2.5
Powerup 2.b
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