Table of Contents
SECTION I
GENERAL INFORMATION
1-1
DESCRIPTION
1-2
This supply, is designed for applications
requiring a constant current source with a high
degree of regulation and stability and very low
ripple characteristics.
The use of a three-posi-
tion output RANGE switch and a lO-tum output
CURRENT control result in resolution down to
O.5f.,lA.
Special attention has been given to circuit
details so that we 11 regu 1a ted perfonnance is main-
tained down to very low output currents -
of the
order of 1
t-LA.
1-3
A special guard supply, within the unit,
pro-'-'
vides a voltage which is used to prevent internal
leakage currents which would degrade the regula-
tion characteristics. Since the positive output
voltage is held equal to the guard voltage.
it
is
also used to drive the front panel voltmeter effec-
tively isolating the voltmeter from the main supply.
This prevents the usual output degradation associ-
ated with connecting a voltmeter across a constant
current supply.
1-4
The supply is completely transistorized (all-
silicon) and is suitable for either bench or rack
operation. It is of the Constant Current/Voltage
\ Umiting type that will furnish full rated output
current at the maximum rated output voltage or can
be continuously adjusted throughout the output
range. The front panel VOLTAGE control is used to
establish the output voltage limit (ceiling) when
the supply is used as a constant current source.
This control is continuously variable throughout
the entire voltage range. The front panel CURRENT
control can be used to establish the output current
limit (overload or shOTt-circuit) if the supply is
used as a voltage limited source.
1-5
A single meter is used to meaSure either out-
put voltage or current.
The dual selection is ac-
complished by a METER switch on the front panel.
Output current can be measured in one of three
ranges in accordance with the RANGE SWitch set-
ting on the front panel.
Output voltage is measur-
ed in only one range.
1-6
The power supply has both front and rear ter-
minals. Either the positive or negative output ter-
minal.may be grounded or the power supply can be
operated floating at up to a maximum of 300 Volts
off grou'Od (added safety precautions should be
1-1
taken to protect the operator when the supply is
used in this mode).
1-7
Terminals at the rear of the unit allow ac-
cess to various control points within the unit to
expand the operating capabilities of the instru-
ment.
A brief description of these capabilities is
given be low:
a.
Remote Programming.
The power supply
can be programmed (controlled) from a remote lo-
cation by means of an external voltage source or
resistance.
The output current can be rapidly pro-
grammed in the up or down direction using this
technique.
Remote programming speed is less than
SOOp.sec from zero to 99% of maximum rated output
with an accuracy of 1%.
b.
External Voltage Monitoring.
The output
voltage of the supply can be externally monitored
with an accurate differential or digita 1 voltmeter
for applications involving component testing or
sorting~
Connecting the external meter to the guard
voltage
prevents output performance degradation
when this feature is employed.
c.
AC Modulation of Output. An external ac
component (or varying de) can be superimposed on
the dc output current of the supply. This feature
permits measurement of dynamic impedance. volt-
age breakdown. and leakage resistance.
1-8
SPECIFICATIONS
1-9
Detailed specifications for the power supply
are given in Table 1-1.
1-10 OPTIONS
1-11 Options are factory modifications of a stan-
dard instrument that are requested by the customer.
The following options are available for the instru-
ment covered by this manual. Where necessary.
detailed coverage of the options is included
throughout 't.'1e manual.
Option No.
14
28
De scriPtion
Three Digit Graduated Decadial
Current Control: Control that re-
places 10-turn current control per-
mitting resettability to within 0.1%.
Rewire For 230V AC Input; Supply
as normally shipped is wired for
115Vac input. Option 28 consists of
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