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the line voltage for which the unit is set and the rear-panel fuse
must be checked. Additional steps may include line voltage con¬
version and rack mounting. Do not apply power to the instru¬
ment before reading paragraph 2-19.
2-11
Location and Cooling
2-12
The instrument is fan cooled and must be installed with
sufficient space in the rear and on sides for air flow. Either side
(but not both) may be restricted to have as little as 1/4 inch
(6mm) space. It should be used In an area where the ambient
temperature, measured at the fan intake, does not exceed
+ 55°C,
2-14
Figure 2-1 illustrates the outline shape and dimensions
of the cabinet.
2-15
Bench Operation
2-16
The instrument cabinet has plastic feet, which are
shaped to ensure self aligning when stacked with other Hewlett-
Packard System II cabinets.
2-18
The unit can be mounted in a standard 19-inch rack
panel or enclosure. Rack mounting accessories for this unit
are listed in the ACCESSORIES paragraph in Section I.
Complete installation instructions are included with each rack
mounting kit.
2-19
nput Power Requirements
2-20
This supply may be operated from a nominal 100 V,
120 V, 220 V or 240 V single-phase ac power source (48-63 Hz).
The input voltage range and input current required for each of
the nominal inputs are listed below. The maximum input power
(at high line, full load) required for any input is 375 watts. A
label on the rear panel indicates the nominal line voltage for
which the instrument was set at the factory. If necessary, the
user can convert the instrument from one line voltage option
to another by following the instructions in Paragraph 2-25.
Nominal
Line Voltage
Maximum
Voltage
Range
Input Current
100 V
87-106
6.0 A rms
120 V
104-127
6.5 A rms
220 V
191-233
3.8 A rms
240 V
208-250
3.6 A rms
2-22
The power supply is shipped from the factory with a
power-cord plug appropriate for the user's location. Figure 2-2
illustrates the standard configuration of power-cord plugs
used by Hewlett-Packard. With each drawing is the HP Part
Number for a replacement power cord equipped with a plug
Figure 2-2.
Power-Cord Plug Configurations
of that configuration. If a different power cord is required, con¬
tact the nearest Hewlett-Packard Sales and Service office.
2-23
To protect operating personnel, the National Electrical
Manufacturers Association (NEMA) recommends that the in¬
strument panel and cabinet be grounded. This instrument is
equipped with a three-conductor power cable; the third con¬
ductor is the ground conductor. When the cable is plugged in¬
to an appropriate receptacle the instrument is grounded, in no
event shall this instrument be operated without an adequate
cabinet ground connection.
2-24
The offset pin on the standard power cable three-prong
connector is the ground connection. If a two-contact recep¬
tacle is encountered, it must be replaced with a properly ground¬
ed three-contact receptacle in accordance with the National
Electrical Code, local codes and ordinances. The work should
be done by a qualified electrician.
Generally, it is good practice to keep the ac in¬
put lines separated from signal lines.
CAUTION
Conversion to or from 100 V operation requires
recalibration and replacement of internal com¬
ponents in addition to the line voltage com¬
ponents, and is to be done only at the factory.
Failure to reconfigure and recalibrate the power
supply may result in damage to the unit.
2-2
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