HP 6038A Service Manual

following rules are followed:
1. The total number of devices is no more than 15.
2. The total length of all the cables used is no more than
two metres times the number of devices connected
together, up to an absolute maximum of 20 metres. (The
length between adjacent devices is not critical as long
as the total accumulated cable length is no more than
the maximum allowed.)
NOTE
IEEE Std 488-1978 states that caution should be
taken if individual cable length exceeds 4m.
3-52 It is recommended that no more than three connec¬
tor blocks be stacked together, as the resultant leverage can
exert excessive force on the mounting panels. Be certain that
all connectors are full seated and that the lock screws are firm¬
ly finger tightened. Do not use a screwdriver. The screwdriver
slots in the lock screws are provided for removal only.
3-53 Paragraph 3-75 provides information for operating the
power supply in an HP-IB system. The Tutorial Description of
the Hewlett-Packard Interface Bus and other documents listed
in Section 1 provide additional information that may be helpful
when designing an HP-IB system.
3-55 Amplified and buffered voltage and current monitor
output signals are available at the rear-panel terminal strip.
These signals can be connected to remote meters to indicate
output voltage and current. The signals vary from 0 to 5 volts
to indicate a zero to full-scale output. Both monitor-output ter¬
minals are referenced to the monitor-common terminal. Out¬
put impedance of the monitor terminals is 10.2 k ± 5%; a load
of 1 megohm will maintain 1% reading accuracy.
3-5S Protective Circuits
3-57 Protective circuits within the power supply may limit
or turn off the output in case of abnormal conditions. The cause
of the protective action can be determined by observing the
front panel indicators (lights and meters).
3-58 Overrange. If an overrange condition exists (load tries
to draw more power than the supply can deliver), the OVER¬
RANGE indicator turns on and both the CV and CC indicators
are off. The product of the VOLTS and AMPS displays will ex¬
ceed the maximum output power of the supply.
3-^ Disabled. If the power supply output is dibbled, either
by a command from HP-IB or by protective circuits within the
power supply, or by the INH line, the power supply output drops
to zero and the DISABLED indicator turns on. The power supply
can be disabled by overvoltage, overtemperature, or foldback
(indicated by front-pane! LED's), by low or high ac line (mains)
voltage, or externally via the Remote Inhibit (INH) line by
command from the contoller (see Paragraph 3-141).
3-80 Overvoltage. If the voltage across the power supply
output terminals rises above a preset level, possibly because
of a hardware malfunction, the overvoltage protection (OVP)
circuit will trip. If this occurs, the power supply will be
disabled and the OV indicator turned on. To reset the OVP cir¬
cuit, first ensure that the condition that caused the overvoltage
is corrected. Then turn the power supply off and back on, or
reset OVP via the HP-IB.
3-61 Overtemperature. If the overtemperature protection
circuit trips, the power supply will be disabled and the OT in¬
dicator turned on. The overtemperature circuit will reset
automatically and the power supply output will be restored when
the temperature drops sufficiently for safe operation.
3-62 AC Line Over/Under Voltage. If the ac line (mains)
input voltage increases or decreases beyond the range for safe
operation the power supply output will be disabled. The power
supply output will be restored when the input voltage is within
range.
3-63 Foldback. If foldback protection is enabled
(FOLDBACK ENABLED LED on) and the power supply
switches to the prohibited mode (CV or CC), the power supply
output will be disabled and the FOLDBACK indicator turned
on. Press the FOLDBACK pushbutton switch to reset the
foldback protection circuit and restore the power supply out¬
put. Unless the conditions (voltage setting, current setting, load
resistance) that caused foldback are changed, the circuit will
trip again when the output is restored. Pressing the FOLDBACK
switch quickly a second time after resetting foldback will turn
off foldback protection if desired.
3^ Error. If the power supply receives an invalid command
(syntax error, out of range), either locally or via HP-IB, the ER¬
ROR indicator turns on. The power supply ignores the invalid
command and remains at previously set values. If the error was
an attempt to exceed output limits using the front-panel OUT¬
PUT ADJUST control (RPG), ERROR will turn off one second
after RPG rotation stops.
3^^ LOCAL OPERATION
3-66 The power supply is configured for local operation
when the unit is turned on. Output voltage and current are both
set to zero, and the OUTPUT AJDUST knob is configured to
adjust output current (CURRENT indicator is on). Pressing the
OUTPUT ADJUST pushbutton switch alternately configures
the OUTPUT ADJUST knob to adjust output voltage and cur¬
rent, as indicated by the VOLTAGE and CURRENT indicators.
Note that the OUTPUT ADJUST knob to adjust output voltage
the OUTPUT ADJUST knob will vary whichever output
parameter, voltage or current, is indicated by the VOLTAGE
and CURRENT indicators, even when the other parameter is
limiting the output.
3-67 By pressing the DISPLAY SETTINGS pushbutton
switch the operator can observe the setting (limits) of both out¬
put parameters, rather than the actual output values. This allows
the operator to set the current limit when the power supply is
operating in CV mode, or set the voltage limit while in CC mode,
without the necessity of disconnecting or adjusting the load.
3-10

HP 6038A Specifications

General

Brand	HP
Model	6038A
Category	Inverter
Language	English