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Agilent Technologies 1989–2002
Agilent 3070 / 79000 Site Preparation
10-129
Chapter 10: Site Preparation – Power Requirements for Older Systems: Tester Power Requirements (Series I/II)
100–127 volts or 10 amps at 200–240 volts,
whichever is applicable.
The power requirements for 3070 Series II family
systems with E1135A/B PDUs are shown in
The maximum current assumes fully loaded systems
with Serial Test Card Power Supplies. Note that the
operating frequency range for the 3070 family systems
is 47–63 hertz when the nominal line frequency is 50 or
60 hertz.
Verifying the AC Input
Before installing the "mains" drop for an E1135A/B
PDU, the ac source must be verified to assure that it is
adequate to power the test system.
CAUTION
✸
Improper ac mains wiring is the most common
site preparation problem. To avoid problems, you
must verify the source and verify that the system
drop conductor is sized correctly.
NOTE
You cannot accurately measure the input current
of the system’s power supplies using conventional
50/60-hertz current probes because the input
current waveforms are rich in harmonics. Any
current-measuring instrument should have a
bandwidth exceeding 10 kilohertz. Using
improper instruments can yield results that are 50
percent less than actual. Also, current demand
depends on the tests that are running on the
system.
CAUTION
✸
Ten thermally-activated circuit breakers designed
to protect the output terminal block are located on
the front of the E1135B PDU. Under normal
operation, if a fault occurs, the rocker on the
breaker will pop to the open position. The rocker
can be reset by pushing it gently back in place. It
is necessary to wait a few minutes for the breaker
to cool before this can be done.
These breakers are not switches and must not be
opened by force. If opened by force, permanent
damage will result. Damage caused by
intentionally opening the breaker is not covered
by warranty.
