HP 6259B User Manual

3-50 The output current of the supply can be adjusted
to exactly zero with a zero programming voltage input
either by installing and adjusting R11 5 as discussed in
paragraph 5-92 or, if the instrument is equipped with
Option 021 or 022, by adjusting potentiometer R116 as
discussed in paragraph 5-94
3-51 Auto-Parallel Operation
3-52 Use the rear panel interconnections shown in
Figure 3-10 or 3-11 to auto-parallel two or three supplies.
This mode of operation provides a greater current capacity
than can be obtained from a single supply while maintain¬
ing nearly equal load sharing among the paralleled supplies
under all load conditions. Supplies having the same model
number make the most practical auto-parallel combinations,
but any of the supplies included in this manual that have
equal current ratings may be used.
NOTE
Use wires of equal length and gauge to connect
each auto-paralleled supply to the load. Load
sharing accuracy is affected unless the positive
leads connecting each supply to the load are
all equal in resistance.
3-53 Setting the Voltage and Current Controls. The
auto-parallel combination of two or three supplies behaves
as if it were a single constant-voltage/constant-current
supply controlled by the voltage and current controls of
the master supply. The voltage controls of the slave(s)
are disabled, but their current controls remain operative
and must be set to maximum to prevent a slave supply from
independently reverting to constant current operation as
would occur if the output current setting of the master
supply exceeded that of a slave.
EXT.
CROWBAR
TRIGGER
Figure 3-9. Voltage Programming of Output Current
(Variable Gain)
3-54 Overvoltage Protection in Auto-Parallel. The
interconnections shown in Figures 3-10 and 3-11 between
the external crowbar trigger terminals on the master and on
the slave(s) must be made to permit the overvoltage crowbar
in the master to fire the SCRs in the master and the slave(s)
if an overvoltage condition occurs. Be sure to connect them
with correct polarity, plus to plus and minus to minus. Set
the slave supply overvoltage potentiometer(s) to maximum
(clockwise) to disable them, and adjust the overvoltage trip
point at the master supply.
3-55 Auto-Parallel With Remote Sensing. To combine
auto-parallel operation with remote sensing, connect the
supplies as described above but remove the +S and —S
jumpers from the master supply and connect the +S and
-S terminals directly to the (+) and (-) ends of the load.
Observe the precautions outlined under paragraph 3-27.
3-56 Auto-Parallel With Remote Programming. When
two or three supplies are connected in auto-parallel, their
combined output voltage, current, or both can also be
remotely programmed. Refer to the appropriate sections
of paragraph 3-34 for the additional rear panel connections
required and make these connections to the master supply
only. Observe all precautions outlined in the paragraphs on
remote programming. The simultaneous use of remote
sensing and remote programming is also possible during
auto-parallel operation.
3-57 Auto-Series Operation
EXT
CROWBAR
TRIGGER
Figure 3-10. Auto-Parallel Operation of Two Units
3-8

HP 6259B Specifications

General

Brand	HP
Model	6259B
Category	Power Supply
Language	English