HP 6038A Service Manual

Section Iff
OPERATING INSTRUCTIONS
3-1 INTRODUCTION
3-2 This section describes the operating controls and in¬
dicators, turn-on checkout procedures, and operating pro¬
cedures and considerations for the HP 6038A. Local (front-
panel) and remote (via HP-IB) operation are described separate¬
ly, but the user should become familiar with both methods of
operation. Information in this section through paragraph 3-64
applies to both local and remote operation. Programming ex¬
amples for specific Hewlett-Packard computers are given in the
introductory Operating Guide, HP P/N 5952-4131. The Quick
Reference Guide, HP P/N 5952-4130, is useful for operators
who are already familiar with the operation of the HP 6038A
power supply. More theoretical descriptions regarding the
operational features of power supplies in general are given in
the DC Power Supply Handbook, Application Note 90B
(available at no charge from your local Hewlett-Packard Sales
Office).
Control Interface intermediate Language (CIIL) programming
is described in Appendix E at the rear of this manual.
Before the instrument is turned on, all protective
earth terminals, extension cords, and devices
connected to the power supply should be con¬
nected to a protective earth ground. Any inter¬
ruption of the protective earth grounding will
cause a potential shock hazard that could result
in personal injury. For continued protection
against fire hazard, use only a 250 Vac fuse with
required current rating. Do not use slow-blow
fuses. Do not use short circuited fuseholders. To
do so could cause a fire and shock hazard.
3-3 CONTROLS AND INDICATORS
3-4 The front-panel controls and indicators are shown in
Figure 3-1 and described in Table 3-1. Table 3-1 also lists the
paragraphs in which use of the controls and indicators Is
described.
3-6 The HP 6038A can operate as a constant voltage (CV)
or constant current (CC) source over a wide range of output
voltage and current combinations. The specifications table con¬
tains a graph showing the overall output range of the power
supply. Figure 3-2 shows a rectangular operating locus that is
defined by voltage and current settings of the power supply.
The point on that locus at which the power supply actually
operates is determined by the load resistance. Three load-
resistance lines are shown on Figure 3-2. The line representing
load resistance A, the highest load resistance shown on the
graph, crosses the operating locus at point 1. Point 1 is on the
part of the operating locus defined by the voltage setting, so
the power supply operates in CV mode.
3-7 Similarly, the line representing load resistance C, the
lowest load resistance shown on the graph, crosses the
operating locus at point 3. Point 3 is on the part of the operating
locus defined by the current setting, so the power supply
operates in CC mode.
3-8 Load Resistance B equals the crossover resistance for
the particular combination of voltage and current settings shown
on the graph, Either the CV or CC LED, or both, will light. If
the load resistance increases, the voltage setting decreases, or
the current setting increases, the power supply will operate In
CV mode. Conversely, if the load resistance decreases, voltage
setting increases, or current decreases, the power supply will
operate in CC mode.
3-9 In Figure 3-2 the entire rectangular operating locus falls
within the output range of the power supply. Figure 3-3 shows
a situation in which the voltage and current settings are high
enough that the rectangular operating locus is cut off by the
maximum output power boundary of the power supply. For the
load resistance A, the power supply operates in CV mode at
the voltage and current values for point 1. Similarly, for load
resistance D the power supply operates in CC mode at point 4.
3-1

HP 6038A Specifications

General

Brand	HP
Model	6038A
Category	Inverter
Language	English