Safety Considerations; Specifications - HP 6038A Operating And Service Manual

1-1 INTRODUCTION
1-2 This operating and service manual contains a descrip¬
tion of the HP Model 6038A System Power Supply, including
specifications, installation and operating instructions, theory of
operation, maintenance procedures and schematics. Program¬
ming Note, part number 5952-4119, provides programming in¬
structions and examples for the Hewlett-Packard series 200
computers (9816, 9920, 9826, 9836, 98360.
1-3 DESCRIPTION
1-4 The HP 6038A is a 200 W autoranging HP-IB power
supply with maximum ratings of 60 V and 10 A. It uses power
MOSFETs in a 20 kHz switching converter to provide an
autoranging output characteristic with laboratory performance.
Output voltage and current are continuously indicated on in¬
dividual meters. LED indicators show the complete operating
state of the unit. Front-panel controls allow the user to set out¬
put voltage, current and overvoltage protection trip level. Over¬
voltage protection (OVP) protects the user's load by quickly
and automatically interrupting energy transfer if a preset trip
voltage is exceeded. Foldback protection can be selected to
disable the power supply output if the unit switches from Con¬
stant Voltage (CV) to Constant Current (CO mode or vice-versa.
Control Interface Intermediate Language (CilL) is available as
an option.
1-5 The HP 6038A can be programmed directly to output
volts and amps. The HP Power Supply can be both a listener
and talker on the HP-IB and status can be read back to the con¬
troller over the HP-IB. The power supply can be programmed
directly in volts and amps. Power supply status can be read
over the HP-IB, and the power supply can be instructed to re¬
quest service for any of nine conditions. Upon command,the
power supply will measure its output voltage, output current,
or OVP trip voltage and put the value on the HP-IB. New out¬
put values can be put on hold and triggered later, allowing the
controller to synchronize multiple units at one time.
1 -6 The following parameters and features can be controlled
via the HP-IB:
« Output voltage setting (12 bits)
• Output current setting (12 bits)
• Trigger (update output)
• Output disable/enabie
® OVP reset
® "Soft" voltage and current limits
® Status reporting
® Service request capability
® Foldback protection
® Output voltage measurement (12 bits)
® Output current measurement (12 bits)
• OVP setting measurement
® Machine state initialization
® 16 machine state presets
® Seif test
1-7 Output connections are made to rear-panel screw-on
terminals. Either the positive or negative output terminal may
be grounded or the output may be floated up to -f 240 Vdc (in¬
cluding output voltage) from chassis ground. Output voltage
can be locally or remotely sensed.
1 -8 The H P 6038A is considerably smaller, lighter and more
efficient than older-design supplies with similar output power
capability. The unit is fan cooled and is packaged in a Hewlett-
Packard System !l-compatib!e modular enclosure which is stur¬
dy, attractive and provides easy access for servicing.
1-9 A fault indicator (FLT) and remote inhibit (INH) circuit
provide additional shutdown protection should either the HP-
IB and/or controller fail.
1-10 The fault circuit provides the user with a means of
knowing the status of any unmasked fault register bit.
Independently of the SRQ function available through the HP-
IB. In other words you do not have to rely on the controller
to inform you of a fault within the power supply.
1-11 The remote inhibit line; which is also independent of
the HP-IB, provides a way to disable the supply remotely (i.e.
a "panic button"). In other words you have a means to bypass
the controller and/or HP-IB to disable the supply.
1-12 SAFETY CONSIDERATIONS
1-13 This product is a Safety Class 1 instrument (provided
with a protective earth terminal). The instrument and this
manual should be reviewed for safety markings and instructions
before operation. Refer to the Safety Summary page at the
beginning of this manual for a summary of general safety in¬
formation, Safety information for specific procedures is located
at appropriate places in this manual.
1-14 SPECIFICATIONS
1-15 Instrument specifications are listed in Table 1-1. These
specifications are the peformance standards or limits against
which the instrument is tested. Supplemental information is also
listed in Table 1-1, including typical but non-warranted
characteristics.
1-16 OPTIONS
1-17 Options are standard factory modifications or