©
Agilent Technologies 1989–2002
Agilent 3070 / 79000 Site Preparation
6-41
Chapter 6: Site Preparation – Power Requirements: Facts about PDUs, MPUs and Power Options
Facts about PDUs,
MPUs and Power
Options
■
79000 systems shipped prior to the 3070 Series 3
used one E1135B PDU in the testhead and those
shipped shortly after the 3070 Series 3 used one
E1135C PDU.
■
Early shipments
1
of Series 3 testheads used the
E1135B PDU. Later shipments used the E1135C
PDU.
■
Module Power Units (MPUs) with Power Factor
Corrected (PFC) Power One
2
power supplies
began shipping on Series II systems in January
1998. All Series 3 systems, both 3070 and 79000,
have PFC Module Power Units (MPUs). PFC
reduces crest current caused by switching power
supplies. This resulted in a reduction in power
consumption and service conductor size.
■
Beginning with the release of Series 3, the
controllers were plugged into 208–240 volt
outlets, reducing service conductor size. The
controller products requiring unswitched power
were plugged into the PDU.
■
Beginning with the release of Series 3, in 2-PDU
single-phase systems, the outlet boxes were
removed from the Support Bay and the DUT
power supplies were connected directly to the
outlets on the rear of the PDU in the Support Bay.
■
Beginning in June 1999, the DUT power supplies
were set to 220 or 240
3
volts
4
input in all systems,
reducing the current demand and service
conductor size.
■
Beginning in June 1999, the equipment connected
to the outlets on the E1135C in the 3070 were
redistributed for improved load balancing.
5
■
Beginning in June 1999, all of the outlets on the
rear panel of the E1135C PDU were changed to a
two-circuit with four-outlets per circuit
configuration.
6
1
Shipped between July 24, 1998 and Sept. 4, 1998
2
Power One Power Factor Corrected (PFC) power supplies can be identified by model number: Non-PFC model number =
HPM
5B2A8BEBQ5236 or PFC Model number =
HPF
5B2A8BEBQ5437. Plug J5 on the rear corner of the power supply is rotated 90
degrees on the PFC model. The plug retaining clips are parallel to the short side of the supply on the PFC model and parallel to the longer
bottom of the supply on the non-PFC model.
3
220 volts for 200–220 volts and 240 volts for 230–240 volts.
4
See Chapter 11,
Site Preparation – Series 3 / 79000 Current Reduction Conversion
, for setting the DUT power supply input voltage.
5
See the
3070 / 79000 Repair Manuals
, Chapter 1B, for additional information.
6
See the
E1135C Power Distribution Unit Operating and Service Manual
, E1135-90001, for additional information.
