HP 6038A Service Manual

3-68 When the power supply is under remote control {RMT
indicator on), neither the VOLTAGE or CURRENT indicator is
on and the OUTPUT ADJUST knob has no effect.
3-69 Constant Voltage Operation
3-70 To set up the power supply for constant voltage
operation:
a. With power supply turned off, connect load to output
terminals.
b. Turn on power supply. Ensure that CURRENT indicator
is on, hold DISPLAY SETTINGS pushbutton switch in,
and rotate OUTPUT ADJUST knob to set desired cur¬
rent limit.
c. Press OUTPUT ADJUST switch once so that OUTPUT
ADJUST knob controls voltage, and adjust output
voltage to desired level.
d. Hold in DISPLAY OVP pushbutton switch and set OVP
ADJUST potentiometer for desired OVP trip voltage.
e. if foldback protection is desired, press FOLDBACK
pushbutton switch to enable this feature.
f. If a load change causes the current limit to be exceeded,
the power supply automatically crosses over to constant
current operation and the output voltage drops propor¬
tionately. If foldback protection is enabled, mode
crossover causes the power supply output to be
disabled. In setting the current limit, make adequate
allowance for high current peaks that could cause un¬
wanted mode crossover.
3-72 To set up the power supply for constant current
operation;
a. With power supply turned off, connect load to output
terminals.
b. Turn on power supply. Press OUTPUT ADJUST
pushbutton switch once so that VOLTAGE indicator turns
on, hold DISPLAY SETTINGS pushbutton svwtch in, and
rotate OUTPUT ADJUST knob to set desired voltage
limit.
c. Press OUTPUT ADJUST switch once so that OUTPUT
ADJUST knob controls current, and adjust output cur¬
rent to desired level.
d. Hold in DISPLAY OVP pushbutton switch and set OVP
ADJUST potentiometer for desired OVP trip voltage. In
CC mode the voltage setting will limit output voltage
under quiescent conditions, and the OVP circuit provides
added protection against hardware faults.
e. If foldback protection is desired, press FOLDBACK
pushbutton switch to enable this feature,
f. If a load change causes the voltage limit to be exceed¬
ed, the power supply automatically crosses over to con¬
stant voltage operation and the output current drops pro¬
portionately. If foldback protection is enabled, mode
crossover causes the power supply output to be disabl¬
ed. In setting the voltage limit, make adequate allowance
for voltage peaks that could cause unwanted mode
crossover.
3-73 Return to Local
3-74 If the power supply is under remote control (RMT in¬
dicator on) and local lockout has not been sent (see Paragraph
3-88), pressing the LCL pushbutton switch will return the unit
to local (front panel) control. Holding the LCL switch in will
prevent the power supply from returning to remote control for
as long as the LCL switch is held in or until local lockout is sent.
3-75 if the power supply has been disabled via HP-IB, or
remote inhibit (DISABLED Indicator on), the LCL switch will
not restore the output. The only way to re-enable the supply
locally is to turn the LINE switch off and then back on. The
OUTPUT ADJUST controls continue to operate in local con¬
trol even If the power supply is disabled.
NOTE
Once the soft limits have been set by the controller
via HP-IB, the OUTPUT ADJUST knob cannot ob¬
tain an output above these limits. This condition
is true for both local and HP-IB control.
3-78 The power supply implements the following HP-IB in¬
terface functions, which are defined by IEEE standard 488:
SH1 (Source Handshake)
AH1 (Acceptor Handshake)
T6 (Talker)
L4 (Listener)
SRI (Service Request)
RL1 (Remote Local)
PP1 (Parallel Poll)
DC1 (Device Clear)
DT1 (Device Trigger)
3-79 Multiline Message Control Functions. The Accep¬
tor Handshake, Source Handshake, Listener, and Talker func¬
tions are implemented by the interface circuits of the power
supply and the controller and require no action by the user. The
LSN or TLK indicators turn on when the power supply Is ad¬
dressed to listen or talk. (The talker function includes serial poll,
see paragraph 3-84,)
3-^ Service Request. Service request Is a uniiine message
that can be asserted by the power supply to interrupt the con¬
troller. Service request can be generated by a power supply
fault condition- The operator defines which of eight power
supply conditions are defined as faults. Enabling or disabling
a condition from asserting service request does not affect the
condition within the power supply, nor does it affect the front-
panel status indicators. Paragraphs 3-168 through 3-179 pro¬
vide instructions for unmasking service request capability-
3-11

HP 6038A Specifications

General

Brand	HP
Model	6038A
Category	Inverter
Language	English