HP 6235A - Page 4

SECTION I
GENERAL INFORMATION
1-1 DESCRIPTION
1-2 The Model 6235A Triple Output Power Supply is a
compact general purpose bench supply particularly useful
for powering developmental !C circuits, both linear and
digital. This constant-voltage/current-limiting supply com¬
bines two 0* to ±18V tracking outputs rated at 0.2A with
a single 0* to +6V output rated at 1 A. The +18V and —18V
tracking outputs can also be used in-series as a single 0 to
36V, 0.2A output. Connections to the outputs are made
to binding posts on the front panel. The +6V and ±18V
outputs share a common output terminal which is isolated
from chassis ground. The chassis ground terminal is located
on the supply's rear heat sink assembly.
1-3 Each output is protected against overload or short-
circuit damage by separate fixed current limit circuits. The
+18V and —18V outputs are each limited to 0.255A ±15%
and the +6V output is limited to 1.275A ±1 5%.
1-4 Voltage controls, output terminals, and a combin¬
ation voltmeter/ammeter are located on the front panel.
One voltage control sets the 0 to +6V output and another
simultaneously adjusts the 0 to +18V and 0 to -18V dual
tracking outputs. A tracking ratio control sets the ratio
between the +18V and -18V outputs. It can set the nega¬
tive supply's output to any value between a minimum that
is less than 0.5V and a maximum that is equal to the positive
supply's output. A 1:1 ratio is useful when powering opera¬
tional amplifiers and other circuits that require balanced
positive and negative voltages. Once the tracking control
has established a voltage ratio between the positive and neg¬
ative outputs, the ratio remains constant as the ±18V volt¬
age control varies both outputs.
1-5 The front panel also contains a line pushbutton
switch with a simulated (non-electrical) on-off indicator,
and four meter select pushbutton switches. One meter push¬
button selects either voltage or current monitoring and
the remaining three pushbuttons select the output to be
monitored and the proper meter range.
1-6 In addition to the standard 104-to-127Vac, 47-to-
63Hz input, a 240Vac nominal line voltage option is avail-
*Each output has a minimum operating voltage of < 50m V.
able. The supply is furnished with a permanently attached
5-foot 3-wire grounding type line cord. The ac line fuse is
in an extractor type fuseholder on the rear heatsink.
1-7 SPECIFICATIONS AND SUPPLEMENTAL
CHARACTERISTICS
1-8 Table 1-1 provides specifications and supplemental
characteristics for Triple Output Power Supply, Model
6235A. Specifications describe the supply's warranted
performance characteristics. The supplemental characteristics
are typical, but non-warranted, performance characteristics
and are intended to provide additional information useful
in applying the power supply.
1-9 OPTIONS
1-10 Options are factory modifications of a standard
instrument that are requested by the customer. The follow¬
ing options are available with this instrument.
OPTION NO. DESCRIPTION
028 Input power: 208-250Vac, 47-63Hz,
single phase.
910 One additional operating and service
manual shipped with the power supply.
1-11 Before the supply is shipped from the factory, an
internal line voltage selector switch is set and the proper
fuse installed for the line voltage specified on the order. A
label on the rear heatsink identifies this line voltage option.
The user can convert an instrument from one line voltage
option to the other by following the instructions in para¬
graph 3-13.
1-12 SAFETY CONSIDERATIONS
1-13 This product is a Safety Class 1 insturment (pro¬
vided with a protective earth terminal). The instrument
and manual should be reviewed for safety markings and
instructions before operation.
1-14 ACCESSORIES
1-15 The accessory listed below may be ordered from
your local Hewlett-Packard field sales office either with the
1-1