INSTRUCTION
MANUAL
Programmable Current Source
Model
.-
725
WARRANTY
We warrant each of our products to be free from defects
and workmanship. Our obligation under this warranty is to repair
or replace any instrument
shipment, proves defective upon examination. We will pay local
domestic surface freight costs.
To
exercise this warranty, write
sentative, or contact Keithley headquarters
You will be given prompt assistance and shipping instructions.
or
part thereof which, within a year after
or
call your local Keithley repre-
in
Cleveland, Ohio.
in
material
REPAIRS AND
CALI BRATI
Keithley Instruments maintains a complete repair and calibration
service as well as a standards laboratory in Cleveland, Ohio.
A
Keithley service facility at our Munich, Germany office is
available for our customers throughout Europe. Service
United Kingdom can be handled at our office
in
ally, Keithley representatives
and calibration facilities.
most countries maintain service
ON
in
in
Reading. Addition-
the
To
insure prompt repair or recalibration service, .please contact
your local field representative or Keithley headquarters directly
before returning the instrument. Estimates for repairs, normal
recalibrations and calibrations traceable to the National Bureau of
Standards are available upon request.
KEITHLEY
The measurement engineers.
Keithley Instruments, Inc., 28775 Aurora Road, Cleveland, Ohio 441
European Headquarters:
United Kingdom:
France:
Heiglhofstrasse
1 Boulton Road, Reading, Berkshire. (0734) 861287
44 Rue Anatole France, F-91121 Palaiseau (01) 014-22-06
5,
0-8000
Munchen 70 West Germany,
39.
(089)
(21
7144065
6)
248-0400
INSTRUCTION MANUAL
Model
Cur
rent
725
Sou
rce
COPYRIGHT 1978, KEITHLEY INSTRUMENTS, INC.
FIRST PRINTING, APRIL 1978, CLEVELANDy OHIO U. S. A.
DOCUMENT NO. 29631, REVISION CODE AA
INSTRUCTION
Programmable Current Source
MANUAL
Model
WARN I NG
If
current is programmed to 0 and unit is in operate, a COMPLIANCE VOLTAGE up to
125
volts may be present at the output terminals. For maximum operator safety the Model
Current Source should always be set to
The
unit should also be set to STANDBY prior to changing range or polarity. This
ensure that no transient currents
will
STANDBY
mode when no current output
be generated.
WARN
I
NG
is
needed.
will
725
725
This instrument is not approved
National Electrical Code, Classes
for
use in “hazardous locations” as defined in the
1,
11,
and
Ill.
Class’l: Those locations in which flammable gases or vapors are or may be present in
the air in quantities sufficient to produce explosive or ignitable mixtures.
Class
11:
Those locations that are hazardous because of the presence
of
combustible
dust.
Class
Ill:
Those locations that are hazardous because of the presence of easily ignitable
fibers or flyings.
~
INSTRUCTION MANUAL
Programmable Current Source
725
Model
Sect
ion
CONTENTS
Page
CONTENTS
ILLUSTRATIONS
1.
GENERAL DESCRIPTION
1-1.
1-2.
1-3.
2.
OPERATION
2-1.
2-2.
2-3.
2-4.
2-5.
2-6.
2-7.
2-8.
3.
CIRCUIT DESCRIPTION
3-1.
3-2.
.
3-3.
3-4.
4.
ACCESSORIES.......................
r
4-1.
5.
MAINTENANCE
5-1.
5-2.
5-3.
5-4.
5-5.
6.
CALIBRATION
6-1.
6-2.
6-3.
7.
REPLACEABLE PARTS
7-1.
7-2.
7-3.
7-4.
7-5.
7-6.
....................
...............
.............................
GENERAL
WARRANTY INFORMATION
CHANGE
NOTICE
.........................
..................................
GENERAL
CONTROLS
I
NDI
CATORS
CONNECTIONS..............................
REMOTE
MEASUREMENT CONSIDERATIONS
PRELIMINARY
OPERATING CHARACTERISTICS
GENERAL.,
THEORY
CIRCUITRY
SWITCHING
................................
PROGRAMMING
AND CONTROL
......................
PROCEDURES
.......................
..............................
OF
OPERATION
...............................
..........
GENERAL
.................................
GENERAL
SERVICING
PARTS REPLACEMENT
CALIBRATION
TROUBLESHOOTING
SCHEDULE
..........................
..............................
.................................
GENERAL
TEST EQUIPMENT
CALIBRATION PROCEDURES
GENERAL
ORDERING
FACTORY SERVICE
CROSS REFERENCE OF MANUFACTURERS
COMPONENT LAYOUTS
SCHEMATICS
INFORMATION
............................
..............................
.........................
...................
..............................
...
III
iv
1-1
1-1
1-1
1-1
2-1
2-
1
2-1
2-
1
2-2
2-6
2-8
2-9
2-11
3-
1
3-1
3-
1
3-1
3-3
4-1
4-
1
5-1
5-
1
5-1
5-
1
5-1
5-
1
6-1
6-
1
6-1
6-
1
7-1
7-
1
7-1
7-
1
7-1
7-
1
7-1
AA
iii
I
LLUSTRAT
I
ONS
INSTRUCTION
Programmable Current Source
MANUAL
Model
725
Figure
1-1
2-
1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
3-
1
4-
1
6-
1
6-2
6-3
6-4
7-
1
7-2
7-3
7-4
No.
Title
Model 725 Programmable Current Source . .
Model 725 Front Panel
Model 725 Rear Panel
Schematic
Triaxial Connector Schematic . . .
Resistive Load
Floating Supply .
Capac
Voltage Limit Characteristics .
Model 725 Block Diagram
Model 1004 Rack Mounting
Chassis - Top View
AccuracyCheck
Regulation Check
Current Model Vs. Voltage Mode Waveforms . . . . . .
Component Layout, PC-22%
Component Layout,
Schematic Diagram - Model 725 Amplifier
Schematic Diagram - Model 725 Power Supply
i
ti
ve Load
of
Output Connections
.....................
.
. . .
.
. . . . . . . .
Kit
PC-438
.
. . .
. . .
. .
.
. . . . . . . . . . . . . . . .
. .
. . . . .
.
.
.
. . . . .
. . .
.
. . . .
.
. .
. .
. .
.
. . . .
.
. . . .
. . . . . .
.
.
.
.
.
.
. . .
.
. .
. .
.
. . .
. . . .
. . . . . . .
. . . .
.
.....
. . . . . . .
.
.
.
.
.
. .
. .
.
Page
1-1
2-
1
2-2
2-3
2-3
2-10
2-1
1
2-12
2-12
3-
1
4-
1
6-0
6-5
6-6
6-6
7-10
7-1
1
7-12
7-13
INSTRUCTION
Programmable Current Source
Model
725
MANUAL
GENERAL
DESCRIPTION
r
1-1.
programmed by a
grammed by use of a Kepco
for the Model
1-2. WARRANTY INFORMATION. The warranty
manual.
1-3.
manual
GENERAL. The Model
725
CHANGE
will
The
A
read the associated CAUTION statements with regard to proper use and handling
the instrument. Damage to the instrument may occur
The
t
symbol indicates those areas on the instrument which are potential shock hazards.
Carefully read the associated
handling of the instrument. Serious personal injury may result
are ignored.
NOTICE. Improvements or changes to the instrument not incorporated into the
be explained on a Change Notice Sheet attached to the inside back cover.
symbol can be found in various places in this Instruction Manual. Carefully
symbol can be found in various places in the Instruction Manual. This
SECTION
725
is
BCD
code. The magnitude of the current (as a
SN-3
are given in Table
Digital-to-Analog Converter or equivalent. Specifications
1.
GENERAL DESCRIPTION.
a completely programmable current source. Ranges are
1-1.
is
stated on the inside front cover of the
IMPORTANT
WARNING
statements with regard to proper use and
%
of
full scale) is
if
these precautions are ignored.
if
these precautions
pro-
of
AA
FIGURE
1-1.
Model
725
Programmable Current Source.
1-1
GENERAL
DESCRIPTION
TABLE
Model 725 Programmable Current Source
SPECIFICATIONS
1-1.
INSTRUCTION
MANUAL
Programmable Current Source
Model
725
GENERAL:
OUTPUT:
DC
Voltage:
Resolution:
Polarity:
Float
Accu
Stab
Load
Line Regulation:
Overload Protection:
Nom. Settling Time:
(when used with Kepco Model SN-3)
Current:
i
ng:
acy
:
I
i
ty:
Regulation:
The Model
current under program control.
Range, polarity, operate/standby
and selection of compliance
are all directly programmable.
Magnitude is programmed by use of
a Kepco
Converter
IOOnA to
seven decade ranges.
Four digitally selectable comp-
liance limits are variable between
no compliance
constant current is maintained to
at least
0.1%
Programmable, posi tive or negative.
+I00
Less than IOppm
chanae in outout current oer volt
on tGe lpa to'
than 20ppm per volt on the
range.
i(0.6% of programmed value
of range).
During the first hour,
subsequent 8-hour periods:
i(0.02% of programmed value
0.01%
1
OOmA
i(O.l% of programmed value
0.03% of range)on the IOOnA range
t0.0055: of full range from no load
to full load on the 10pA through
IOOmA ranges. tO.O2%
range. ?0.2% on the IOOnA range.
i0.005% of
change in line voltage.
Voltage limited to compliance
voltage setting of polarity
selected. Automatic recovery.
30 milliseconds to within
final value.
725
provides constant PROGRAMMING:
limil
SN-3
Digital to Analog
or
equivalent.
IOOmA
full scale in
12
volts and
100
of
range.
volts off chassis maximum.
limit
volts.
of
lOOmA
90
volts. With
programmed, ISOLATION:
full range
or
1
OOnA
t
n
Less
0.1%
ranges
+
or
range) on the
ranges.
1pA
to POWER:
+
on
the IpA
full
range for
10%
0.1%
of
Functions:
Compatible Logic:
Logic Power:
ENVIRONMENT:
CONTROLS, INDICATORS:
CONNECTORS:
DIMENSIONS,
WEIGHT:
9
in. x
of
@
limit.
3,4
Range, polarity, selection
1
of
4
operate/standby are all directly programmable. Magnitude
is programmed
nal for
TTL or DTL. Maximum input
load,
operate/standby where driving
circuit must sink 60mA.
An
250mA TTL-compatible logic
supply is required.
1090hms; digital low to output
low.
20" to 30°C up to 50%
relative humidity.
Front panel ON/OFF switch.
operate, and compliance
Rear panel 15-pin D style
connector for digital input
Rear panel triaxial connector
for magnitude programming.
Front and rear panel output
mni tori ng,
35
Overall bench size
high x 225mm wide x 310mm
compliance limits, and
by
0-100%
10
TTL loads, except
external
Indicator lights for range,
(mating connector suppl ied).
triax connectors. Rear panel
banana jacks for compliance
105-125 or 210-250 volts
(switch selectable). 50-60Hz.
VA
maximum.
133mm
(5-
1
a 0-IOV sig-
of
full range.
5V
(t0.25V)
/4
in.) ha 1 f-rack.
155mm
deep. (6-l/4 in. x
12-1/4 in.). Net weight
kg. (7-1/2 Ibs.).
1-2
AA
INSTRUCTION
Programmable Current Source
Model
725
MANUAL
OPERATION
r
2-1. GENERAL. This section provides interface information and operating instructions
for the Model 725.
2-2. CONTROLS. The Model 725 is remotely programmable and as such,
only two switches.
TAGE selector switch (S201) is on the rear panel. These switches are shown in Figures
2-1 and 2-2 and functionally described in Table 2-1.
2-3.
725.
applied to the instrument. Nine
emitting diode type. Seven of the lamps (DS301-DS307) are dedicated to the current ranges,
with the lighted LED indicating the programmed range. The two remaining LED'S
and DS308) give indication of the operating modes of the instrument. When the
lamp is on, the instrument is in operating mode and current is supplied to the
connectors; when off, standby mode
voltage required to drive the programmed current through the load reaches the preset
compliance voltage
constant voltage mode.
INDICATORS.
A
neon lamp (DS201) is lighted when the line
The line
Ten front panel indicators provide the operating status of the Model
limit.
SECTION 2.
POWER
At
switch (S302) is on the front panel and the LINE VOL-
of
the indicators are of the high efficiency light-
is
implied. The COMPLIANCE LIMIT lamp lights when the
this point, the 725 changes from constant current to
OPERATION.
POWER
switch
is
equipped with
is
on and line power
(DSlOl
OPERATE
OUTPUT
is
AA
5202
DS2Ol
FIGURE
2-1. Model 725 Front Panel.
DS101
DS308 J102
2-1
OPERATION
INSTRUCTION
Programmable Current Source
MANUAL
Model
725
J701
FIGURE
2-2. Model 725 Rear Panel.
SiOl
F2OI
P201
~
~-
2-4. CONNECTIONS. The input and output connections are described below and shown in
Figures 2-1 and 2-2. These connections are also listed in Table 2-1. The output connec-
tions are also shown schematically in Figure 2-3.
a. Output Connectors. The front and rear panel triaxial OUTPUT connectors (J102,
Jl03) are wired in parallel.
is high, the inner shield is low and the outer shield is chassis ground.
connectors are shown schematically in Figure 2-4. The OUTPUT connection can be made
By
definition, the inner conductor of the triax connector
The triax
to
either the front panel connector or the rear panel connector. The unused OUTPUT connector should have a cover (two
CAP-18
are supplied) installed to provide protection against
electrical shock and dust accumulation. The cover also provides electrical shielding.
Output connections should be made using low-noise triaxial cable. For custom length
cables, Keithley Part
connector
is
available by ordering Keithley Part
No.
SC-22 low-noise triaxial cable should be used.
110.
CS-141.
A
mating
WARFJ I NG
\
%
When the Model 725
is
float
connectors even though the
The actual voltage present
ng, high voltage may be present at the OUTPUT
nstrument
s
dependent on the customer supplied voltage
is
in standby (non-operate mode).
source, up to 100 volts.
Low
b.
and Ground Terminals. Two
identified as LOW (J202) and
1.
The LOW terminal (Black) is
connectors.
2-2
GROUND
binding posts are located
J201).
nternal
y
connected
to
the low
on
the rear panel and
of
the two OUTPUT
.-
AA
INSTRUCTION
Programmable Current Source
Model
725
MANUAL
OPERATION
GROUND
r
I
I
I
L
LOW
I
--
J202
LOW
MODEL
-@-
I0
I----
LOW
HIGH
725
HIGH
/
/
JlO3
J102
OUTPUT
1
I
I
I
OUTPUT
CHASS
s
FIGURE
2-3.
[
CHASS
GROUND
Schematic
HIGH
Low
I
S
*--,
'\
,'m
1
,
of
Output Connections,
',
,.
I
NNER
CONDUCTOR
<
INNER
SH I ELD
AA
FIGURE
2-4.
Triaxial Connector Schematic.
2-3
OPERATION
2. The
provided for connecting LOW to chassis ground. mfloatinqtions, the 1 ink
gust be removed.
to minimize noise pickup.
C.
COMPLICANCE MONITOR Terminals, Two banana jacks (Black, Red) are located on the
rear panel and permit monitoring
1.
GROUIJD
--
The black terminal (Jl06) is connected to LOW of the OUTPUT connectors.
terminal (Green) is connected to chassis ground.
For other applications, leave the shorting link in, where possible,
of
the compliance voltage.
INSTRUCTION
Programmable Current Source
A
shorting link
MANUAL
725
Model
is
---.
=
is
full
2. The red terminal (Jl05) is connected to an internally buffered voltage, which
approximately at the same voltage as OUTPUT
d. knaloq Input. The
rear panel. The analog input must be a positive voltage
scale current). The analog voltage must be floating (not referenced to any other signal
or chassis ground).
source. This cable should be kept
and to improve transient response.
Keithley Part No.
(Keithley
Do not short
A
damage the Model 725.
e. Program Connector. Programming and control connections to the Model 725 are made
through a 15-pin
and
its
also see the discussion on Remote Programming and Control (paragraph 2-5).
f.
1.
with third-wire earth grounded receptacles. Prior to connecting P201 to line power,
verify that the line voltage selector switch
voltage level,
Part
accessories are supplied with the Model 725. See Table 2-2 for pin identification,
Line Power Cord and Fuse.
The Model
CS-141.
No. 29449B). Also, see Magnitude Programming, paragraph 2-5f.
HIGH
"D"
725 is provided with a three-wire line cord and plug (P201) which mates
i.e.,
ANALOG
A
low noise triaxial cable should be used to connect to the voltage
When the Kepco
or LOW of Analog Input connector to chassis ground, as this may
type connector (JlO4) located on the rear panel. A mating connector
117V
INPUT triaxial connector
-
<
3
feet to minimize capacitive loading of the source
A
mating connector is available by ordering
position for
HIGH,
SN-3
CAUT
I
ON
105-125 volts and 234V position for 210-250 volts.
through a
is
purchased, a custom cable is supplied
(S201) is set
(J101)
from
to
47Kn
0
isolation resistor.
is located on the
to
10
volts.
correspond to the input
(1OV
T
2. The line fuse (F201) is a type
234V.
2-4
3AG,
slow blow. Use
1/4A
for
ll7V
and
1/8A
for
AA
INSTRUCTION
Programmable Current Source
Model
725
MANUAL
OPERATION
r
CONTROLS, INDICATORS
I
tem
FRONT
Li ne power lamp (DS201)
RANGE
STATUS Indicators
OUTPUT
REAR
PANEL
POWER
(DS30
(DSlOl
switch (S202)
I
nd i ca tors
1
-DS307)
,
DS308)
Connector (J 102)
PANEL
TABLE 2-1.
AND
CONNECTIONS.
Functional Description
Controls
Lights when line power
When a range
indicating programmed current range.
DSlOl
limit
voltage mode, rather than constant current mode when
1
ighted.
DS308 is lighted in operate mode. When off standby
mode
connector and HIGH to LOW shorted by 200R resistor.
Triaxial connector wired in parallel with
panel OUTPUT connector Jl03. Use J102 or Jl03.
See NOTE for Triaxial Connector signal definition.
1
ine power to 725.
is
applied by S202.
is
programmed, one of seven
indicates that the preset compliance voltage
has been reached - 725 operates in constant
is
implied, with no current supplied to OUTPIIT
is
lighted-
rear
Line VOLTAGE Switch (S201)
ANALOG INPUT (J101)
A
OUTPUT Connector (Jl03)
P L I
(F201)
AN
GROUND
C
E
MO
N
I
TO
R
LOW and
Connectors (J202, J701)
C.
OM
(J105, J 106)
FUSE
Must be set to correspond with the level of the input
1
ine voltage (117 or 234 volts).
-
Triaxial connector
paragraph
shield
Do not short HIGH or LOW
this may damage the 725.
Triaxial connector wired in parallel LJith front
panel OUTPUT connector J102. Use J102 or Jl03. See
NOTE
LOW (J202) is connected to LOW of OUTPUT connectors
J102 and
ground. The link (supplied) permits connecting LOW
to chassis ground.
Permits monitoring
is
connected to OUTPUT LOW and Jl05
internal ly biiffered voltage (=OUTPUT HIGH) through
47
KSd
Type
2.-5f.
is
LOW and outer shield
for triaxial connector signal definition.
JlO3.
isolation.
3AG,
Slow
Elow.
See Magnitude Programming,
Inner conductor
I
CAUT
Ground (J201)
of
the compliance voltage. JlO6
117V
ON
of
JlOl to chassis ground, as
(1/4A); 234V (1/8A)
is
HIGH, inner
is
Chassis ground.
is
connected to chassis
is
connected to an
AA
Power
Cord (P201)
Connects line power to instrument.
2-5
OPERATION
I
tern
TABLE 2-1. (CON'T)
Funct iona 1 Descri pt ion
INSTRUCTION
Programmable Current Source
MANUAL
Model
725
PROGRAM
2-5.
numericial code
range = 10-lA.
Driving circuit must be able to sink =3mA per line. The programmed range
by one
supplied unless the POLARITY line
an output current.
is
REMOTE
a. Range Programming. The range is programmed by supplying a
b. Polarity Control. The current source is set up such that a positive current
c. Operate Commaned. The operate line must be pulled low to enable the 725 to produce
shorted and a 200 ohm resistor connected across the output connector.
Connector (Jl04)
PROGRAMMING
is
equal to the range exponent of the range selected. Example:
(lomx
of
seven front panel range indicating LED'S.
AND
CONTROL.
where x is the range code). See Table 2-2 for pin identification.
In the standby (non-Operate mode) the internal current generator
15-pi n
725 to the digital control. See Table 2-1 for pin
identification.
Triaxial Connector signal definition
is
"D"
pulled low. See Schematic 28630E.
type connector - permi ts connecting the
NOTE
-
J101, J102, JlO3
Inner conductor
Inner shield
Outer shield
=
HIGH
=
LOW
=
Chassis ground.
BCD
code (1 ,2,4). The
is
indicated
1
=
is
lOOmA
---.
d. Compliance Limit. Four internally adjustable potentiometers are provided for use
as preset compliance
accomplished by pulling the particular compliance relay line to low. The adjustments are
located just behind the top of the front panel. Access can be gained by removal of
the top cover. Compliance potentiometers are arranged such that compliance numbers
through 4 from left to right facing the front panel may be used at any particular time
to provide a larger number of compliance
the compliance voltage
If
none of the lines are pulled low, the compliance
This mode of operation should not be used because of the uncertainty of operation outside
of the specified
e. Programming Techniques. Programming can be done in any sequence. However,
suggested that standby be selected before a range
should be held until a new range has been selected, Standby should also be used when
making connections to the Model 725L
f.
Magnitude Programming. The magnitude of the current on a particular range
selected by programming a Kepco
725 is a basic voltage to current converter. An analog voltage,
supplied to the "analog input".
limits.
will
limits
Selection of a particular preset compliance
limits.
be less than the lowest preset compliance
(l2V-gOV). Loading of the compliance lines is
SE1-3
Diqital to Analog converter or equivalent. The
If
more than one line
limit
or
will
polarity is changed and standby
be approximately 125V.
0
to
+1OV,
limit
is
pulled low,
limit
lOmA
selected.
per line.
must be
is
is
it
1
is
2-6
AA
INSTRUCTION
Programmable Current Source
Model
725
MANUAL
OPERATION
r-
/--
CAUT
I
ON
The programming Analog Signal must be floating (not referenced to any other
signal or to chassis.) The Kcpco
g.
Kepco
left to the customer.
h. External
250mA minimum. See Table 2-2 for pin connections.
PIN
172
3
4
5
6
SN-3
Interface. The digital interface of the Kepco
+5
Volt Supply. An external floating
PI N FUNCTIONS
+5
Supply in (Logic High)
No
Connect ion
Range Selection
Range Selection
No Connect ion
A
SN-3
FUtJCTI
Manual
FOR
OtJ
BCD
BCD
is
TABLE 2-2.
RANGE
1
11
Sll-3
supplied whenever the
PROGRAHHI
Apply an external
&
High True
se
High True
se
is such a voltage supply.
+5
volt supply is required,
f1G
CONNECTOR
Logic.
1
ec ted
1
ected
SN-3
SN-3
J
OPERATI
-
Hold low to Common unless
-
Hold low to Common unless
or equivalent,
is purchased.
1011
011
+SV
to Power Relays
is
+5V
@
to
7
8
9
10
12
14
15
r
Compliance 2
Compl iance
Polarity
Operate
Common (Dig
-Low of
Range Selection
Compliance
Compliance
Common (Digital ground) maximum of
1+
i
ta 1 ground)
+5
Volt Supply
1
3
BCD
2
Pull down
Pull down to Common to select
ti1
Positive (Relay deenergized)
LO Negative (Relay energized) 60mA
Pull down to Common for output
current, otherwise unit is in Standby.
Low side of
to any other circuit. See Note.
High True
se
1
ec ted
Pull down to Common to select
Pull down to Common to select
NOTE
:
30
volts off the chassis ground,
Common to select
5V
Supply is not connected
-
tiold low to Common unless
AA
2-7
0
P
E
RAT1
0
N
INSTRUCTION
Programmable Current Source
MANUAL
Model
725
2-6. MEASUREMENT CONSIDERATIONS.
is
a. Accuracy. Since the total accuracy of the Model 725
current value accuracy and the range accuracy, the user should select the lowest useable
range for best possible accuracy.
b. Stability. Since stability is specified in terms
and the range selected, the user should select the lowest useable range
possible stability.
c. Line Regulation. The line regulat
corresponding 10% change in line voltage
d. Load Regulation. The load regulat
no load to full load on the
on the lOOnA range. The no load to full
voltage change
e. Output Impedance. The effective output impedance
load regulation specification and the high
impedance for each range
2
x
10l2 ohms; therefore, the maximum output impedance is 2 x 10l2 on the lOOnA and
ranges. The effective output impedance
from
0
volts to 100 volts
lOpA
is
given in Table 2-3. The insulation resistance
through
.
For
lOOmA
Range:
RL
=
Since
103R and % regulation
%
regulation = 100
on is stated as +0.005% of full range for a
on
is
specified as 20.005% of full range from
lOOmA
load variation corresponds
(R
0
ranges,
to
low insulation resistance. The output
)
can be determined by the following equations.
x
of
+0.02%
of
=
0.005%.
RL
Ro
the sum
programmed current value
on the
the 725 is a function of the
+
RL
-
of
the programmed
for
best
lpA
range and 20.2%
to
an output compliance
is
typically
lpA
7
I
1
Then
Ro
>
--
OORL
%
Output Impedance
Programmed Range
100
mA
10
mA
1
mA
100 pA
10
PA
1
PA
100 nA
REG
TABLE
I
OR
2-3.
~~~~
Output Impedance
2
107
S-I
2 x 108
2
2 x
2
x
2
x
2 x 1012
R
lo9
R
1010
1011
1012
R
R,
R
R
AA
INSTRUCTION MANUAL
Programmable
725
Model
Current Source
0
PER
AT
I0
N
r
f.
Maximum Load. The Model 725
0
to
tance from
current
resistance exceeds
mode, indicated by the COMPLIANCE LIMIT lamp (DS101) being 1 ighted.
g. Floating Operation. The instrument can be floated up to ? 100 volts off of chassis
around with less than 20ppm of full ranqe chanqe in output current per volt on the lOOnA
Fange and less than 1Oppm'per volt on the othe; ranges.' For floating operation, the
shorting link must be removed. The outer shell of both OUTPUT connectors is always at
chassis ground for safety when floating the instrument.
is connected between the
pickup. The LOW to
floating operation is shown in Figure 2-6. In this example, the Model 725 can be used
with a voltage supply such as the Keithley Model 240A to extend the maximum useable
compliance voltage to +200 volts (+lo0
can be adjusted for a compliance voltage of +lo0 &lo0 volts dc. The maximum current is
10
mi
2-7. PRELIMINARY
(I)
11
iamperes (for the Model 240A).
When the instrument
t
100 volts
RMAX.
and the compliance voltage selected (Vc) where
The value of
RMAX,
GROUND
will
PROCEDURES.
then the Model 725
LOW
and chassis
isolation is approximately 10': ohms.
is
be present at the OUTPUT connectors.
will
floated and no compliance voltage is selected, up to
deliver the programmed current for a load resis-
RMAX
is determined by the magnitude of the programmed
RMAX
=
Vc/I.
will
GROUND
+
floating voltage). In this case the Model 725
WARN
automatically switch into voltage
A
5uF
filter capacitor (C217)
binding osts to minimize line frequency
A
typical example of
I
NG
If
the load
limit
,-
a. Inspection. The Model 725 was carefully inspected both mechanically and electrically before shipment.
may have occurred during transit, Report any damages to the shipping agent. To verify
the electrical specifications, follow the procedures given in Section
b. Power, The Model 725 is provided with a three-wire line cord which mates with
third-wire earth grounded receptacles. Connect the instrument to ac line power as
follows:
Connect only to the line voltage selected, Application of incorrect
voltage can damage the instrument.
1.
Set the LINE VOLTAGE switch on the back of the instrument to correspond to
the line voltage available.
to 250 volts ac (234V posit ion).
2. Verify that the proper line fuse (F301) is installed for the line voltage, as
indicated on the back panel label.
Ground the instrument through a properly grounded receptacle before operation.
Failure to ground the instrument can result in severe injury or death in the
t
event of a short circuit or malfunction.
Upon receiving the instrument, check for any obvious damage which
6.
1
ON
CAUT
lo5
Ranges are
WARN
to 125 volts ac
I
NG
(117V
position) and 210
AA
2-9
0
PER
AT
I0
N
3.
Set the Power switch on the Front panel to the
cord into a properly earth-grounded outlet.
c. Input Connections. Make the analog input and program connections as described in
Paragraph
d. Adjustment of Compliance Limits. The Model 725 is shipped from the factory with
the four compliance
voltage
1.
cover to gain access. The compliance potentiometers are arranged such that compliance
numbers
respectively).
2. Disconnect all output loads from Model 725.
3.
volts and appropriate range.
4.
low, other
5.
2-4.
(=
The adjustments are located just behind the top front panel. Remove the top
1
Connect
Apply line power to the Model 725. Program standby and comp
Program the desired polarity and current range and magnitude
Paragraph 2-5 describes the required signal levels and driving circuits,
limit
12
volts). To preset the compliance voltage limits, proceed as follows:
through 4 are left to right when facing the front panel (R301 through R304,
DMM
to COMPLIANCE
COMP.
lines high).
potentiometers set fully
MONITOR
jacks on rear panel of
Off
position and plug the power
CCW
to provide minimum compliance
INSTRUCTION
Programmable Current Source
725.
Set
iance
DMM
1
MANUAL
for dc
(COMP.
Model
1
725
FJOTE
It
is normal to have a slight difference in the compliance
polarity.
6.
Program operate (OPERATE 1 ine low).
7.
Adjust
8.
Program standby.
9.
Repeat steps 4 through 8 above to preset compliance
Release the compliance line pulled low before programming
to be set.
COMP. 1 potentiometer (R301) for the desired
------
r
MODEL
725
1
I
I
I
I
WHEN
~312
I
I1
I1
'I
11
'r-
limit
imit.
imits 2
he next
LOW
on the opposite
through
compliance
4.
limit
t+
vo
RL
J-
2-1
0
L
FIGURE
2-5.
Resistive Load.
INSTRUCTION
Programmable Current Source
725
Model
2-8. OPERATING CHARACTER
Model 725 Current Source has a bipolar output, a constant current up to the maximum
compliance setting, and automatic crossover to constant voltage mode.
MANUAL
STICS. In addition to being complete
-
OPERATION
y
programmable, the
a. Bipolar Output. The Model
a bipolar output.
1.
Current Source. The instrument can be used as a current source with a resistive
load as shown in Figure 2-5. In this case, the Model
current.
2. Current Sink. The instrument can be used as a current sink as shown in Figure
2-6. In this case, the polarity
the Model 725. The output voltage
RL
is the load resistance.
b. Constant Current Mode. The Model 725
resistive, capacitive loads unless the voltage required at the output terminals exceeds
the compliance voltage
1.
load from
2. Capacitive Load. The instrument can also be used to charge a capacitive load as
shown in Figure 2-7. The capacitor
The voltage developed across the load resistance
limit.
Resistive Load. The instrument can be used to deliver current to a resistive
0
ohms to
When charging large capacitive loads
a series resistor in the Model 725 OUTPUT to
<
500mA. Otherwise, damage to the Model 725 could occur when going to standby
mode.
RMAX
=
725
of
VC/lo
and
can deliver or accept current and as such
725
delivers the programmed
RL
is
VL
=
IORL,
the current
VO = E
will
-
will
Vc
is the compliance voltage.
charge to the compliance voltage.
I
ON
CAUT
is
such that current
IoRL,
(>
where
deliver the programmed current for
lOOOpF charged to > 10
LO
limit
peak discharge current to
is
the programmed current,
is
flowing into
volts) insert
it
has
---
VOLTAGE
SUPPLY
+
I.&
1
LOW
HIGH
\'I
VL = E k VO
Vo
=
(E - loRL)
FIGURE 2-6. Floating Supply.
----
I
y!l
L---
MODEL
725
1
1
1
I
I
I
I
J
AA
2-1
1
OPERATION
INSTRUCTION
Programmable Current Source
MANUAL
Model
725
c. Constant Voltage Mode. The Model 725 can be adjusted
from
that
compliance setting.
greater than 100 could be developed regardless
10
to
90
volts. The voltage limiting
IORL
=
VC.
(the LIMIT lamp
The instrument
will
be lighted) such that the output voltage
If
the Model 725 is used as a current sink, an output voltage
will
automatically switch into a constant voltage mode
will
occur
of
limiting characteristic can be seen in Figure 2-8.
MODEL 725
I
I
if
the compliance setting. The voltage
fcSelect value
current to ~500
..
I
nw
for
a compliance voltage
the load resistance is such
will
relay (K312) is closed.
Vc
=
not exceed the
to
limit
mA
I
+I
VO
(WHEN
CHARGED)
FULL
discharge
when standby
I0
-
C
Y
t
I0
FIGURE 2-7. Capacitive Load.
CONSTANT CURRENT
MODE
=
"0
ChNSTANT
ilOLTA\LE
COMPLIAtjCE VOLTAGE
MODE
2-1
2
FIGURE 2-8. Voltage Limit Characteristics.
AA
INSTRUCTION
Programmable Current Source
725
Model
MANUAL
CIRCUIT DESCRIPTION
r
3-1.
various circuits as shown in Figure
3-2. THEORY
with a compliance voltage up to
differential amp1 ifier
The differential voltage sensing amplifier
a voltage reference. The voltage compliance amplifier 11A211 senses the voltage at a point
ahead of the range resistor with respect to the compliance voltage control potential. The
compliance voltage supplies allow a
deliver power to the load up to a maximum
lators are driven by the high gain differential amplifier
selected by the
maining power supplies are used to bias the operational amplifiers and reference source.
r
GENERAL. The Model 725
High Gain Operational Ampl ifier
a.
Differential Voltage Sensing Ampl ifier
b.
C.
Voltage Compliance Amplifier I1A2l1.
d.
Compliance Voltage Control.
Compliance Voltage Supplies t130
e.
f.
Series Regulators.
Range Resistor Controls.
9.
Power Supplies.
h.
OF
OPERATION. The Model 725 can deliver currents from to 10-1 amperes
RANGE
Switch for currents of
SECTION
is
3.
CIRCUIT DESCRIPTION.
an all solid-state current source which
3-1.
These circuits include the following types.
"A3".
"All'.
V.
30
volts. The current source utilizes a high gain
"A3"
which controls the current through the range resistor
I'AlIl
senses the OUTPUT voltage with respect to
t90
volt compliance at the output.
of
10
watts (100 V x 0.1A). The series regu-
"A3lI.
to 10-1 ampere
The range resistor
--
full range. The re-
is
composed of
These supplies
"RII.
is
3-3.
(28679E) for the following discussion.
followers (Q111 and Q114), a differential npn gain stage (transistors 4112 and
differential
Q1
pair of FETIs (transistors
CIRCUITRY. Refer to the Ampl ifier Schematic (23680E) and Power Supply Schematic
a. Hiqh Gain Operation Amplifier
pnp gain stage
15
and a second
b.
Differential Voltaqe Sensing Amplifier
npn contrdl
(transistors
stage
Q118A
r
01
V IOER
I
-----
EXTERNAL
SN-3 OR
VOLT
ADJUST
L
I
IlA3".
(Qll6
and Q118B). This stage provides the very high input
4-
This amplifier is composed of matched emitter
QlOg
and
and
QllO),
Q1
17)
"All1.
SERIES
-
REG.
t
SERIES RES
REG.
an emitter follower transistor
.
This amplifier
130
-
-
I
STORS
I
V
is
composed of a matched
I
PARALLEL
+
-
=
TR I AX
OUTPUT
CONNECTORS
J102 AND J103
..
1
Q113),
a
AA
FIGURE
3-1.
Model 725 Block Diagram.
3-1
CIRCUIT DESCRIPTION
NSTRUCTION
Programmable Current Source
MANUAL
725
Model
impedance necessary for sensing output current on the lower ranqes;
output even with
nodes.
c. Input Divider. An accurate divider, composed of
down to 1-volt full scale.
precisely 1-volt.
d.
Voh-aqe
gain stage; transistors Q107 and Ql03.
by a divider string composed of resistors
Potentiometer
lifier is biased "off" in the constant-current mode of operation.
the "series regulator output" reaches the preselected compl iance
is turned
indicator
polarity, transistor
The differential output voltage
Transistor Q202 is turned on and therefore drives transistor Q207. (The LIMIT indicator
is
connected in series with Q207). Transistor Q202 provides voltage level translation.
For negative polarity, the difference voltage between Ql07 and 4108
sistors
Transistor Q206 provides voltage level translation and drives Q208. The LIMIT indicator
is
connected in series with Q208 and is turned on. Potentiometers R203 and R207 provide
control of the LIMIT indicator turn-on for
"ON"
DSlOl
0205 and 4206 are driven.
lOMR
feedback-resistor. Teflon insulation is ;sei to isolate critical
Potentiometer R182 is used
Compl ia~ce-~~l ifier "A2"
Rll6
provides an internal maximum compliance voltage adjustment.
and the Model 725 automatically changes
is
turned on automatically when in the "voltage
Q103
turns on in the voltage
is
.
This amplifier is composed
The bias reference for transistor
R115,
buffered by emitter-follower stage, 4201 and 4204.
(Transistors Q201 and 4204 act as buffer stages.)
+
R116
limit
limit
and-
R181
and
to
adjust the reference voltage to
selected compliance resistor and
to
a voltage
mode while Ql07 is turned off.
limit,
respectively.
t
does not overload
R183,
limit
divides the 10 volts
of
a differential
QlO8
!Jhen the voltage at
limit,
the amplifier "A2I1
limit
is
mode. The
mode". For positive
such that tran-
is
The amp-
provided
R118.
LIMIT
-
e. Compliance Voltage Control. The output voltage appears across
Selecting a compliance line places its pot in parallel with
with
R115
and
R116
limit
for the series regulators.
rectified by diode bridge D2O7. Capacitors C203 thru C206 provide filtering
output stage. (These transistors are rated at 300 volts,
and 0106 are current limiting transistors which shunt current around the output transistors
during a transient
10-1 amperes.
current, the voltage drop across the Range resistor
and voltage references.
is the same in both polarities.
f.
Compliance Voltage Supplies. These voltage supplies provide unregulated k130 volts
g. Series Regulators. Transistors
h. Range Resistor Controls. The Range relays select full range current from to
i.
Power Supplies. The remaining power supplies provide power to the amplifier
1.
510 volts. Diode bridge D203 provides unregulated voltages for the
regulator stages. Capacitors C207 and C203 provide filtering. Transistors 4209
Q210 and reference zeners D205 and D206
provides bias voltages for the voltage LIMIT indicator circuit.
sets
or
Range resistors R306 thru R312 are selected such that, for each selected
limit.
fault condition.
Total resistance
AC
power is obtained from a secondary
QlOl
and
form
is
(R313//R314//POT)
QlO5
form
R
is 1 volt for full range.
the i.10 volt regulators. This supp
R313
a quasi-complimentary symmetry
35
watts.) Transistors Ql03
R313//R314
and
R314.
+
R118.
of
transformer T201 and
and
R118.
Divider ratio
Compliance
of
ac ripple.
stages
vo
t
and
Y
+lo
-
3-2
AA
INSTRUCTION MANUAL
Programmable
Model
725
Current Source
CIRCUIT
DESCRIPTION
r
2. +12 volts. This supply provides power to the amplifier stages and reference
diode
and a linear operational amplifier QA202. The voltage developed by QA201 is 24 volts.
This output is split to form separate +12 volt supplies.
to the output high.) Potentiometer ~226 provides adjustment of the 24 volt output.
3-4.
of the current at the
accomplished by reversing the polarity
is a bipolar amplifier. The "STANDBY" position permits a change of polarity to be made
without developing large transients. The
to "LOW" through a 200ohm shunt as shown in Figure
be shunted through the relay contact resistance, up to
between the
Dllb.
SWITCHING. The polarity relay switches the internal circuitry such that the polarity
The supplies consist of a diode bridge D209, an integrated circuit QA201,
(These supplies are referenced
"HIGH''
"HIGH"
and "LOW' terminals with no load.
terminal can be changed
of
the voltage references since amplifier
"STANDBY"
2-5.
with
position connects the
respect to "LOW". This is
Since the selected current
40
millivolts can be developed
"HIGH"
"A3"
output
will
AA
3-3
INSTRUCTION
Programmable Current Source
Model
725
MANUAL
ACCESSORIES
f-'
r
SECTION
4-1.
provide additional convenience and versatility.
Description:
Application:
Parts List:
GENERAL. The following Keithley accessories can be used with the Model 725 to
Model 1004 Rack Mounting
The Model 1004 is a rack mounting kit with overall dimensions 5-1/2 inches high
inches wide x 10 inches deep.
The Model 1004 converts the instrument from bench to rack mounting.
for mounting one Instrument in one-half of a standard 19-inch rack.
1
tern Qty. Per Kei thley
No. Desc
1
2 Panel
3
4
5
6
7
8
r
i
pt ion Assembly Part
Top Cover
Ang 1 e
Screw
Plate
Screw
Angle
Bottom Cover
4.
ACCESSORIES.
1
1
1
4
1
4
1
1
Kit
200 168
174528
17476A
------
19126A
------
14624B
200
1
68
No.
It
is suitable
x
19
AA
FIGURE
4-'1.
Model 1004 Rack Mounting
Kit.
4-1
INSTRUCTION
Programmable Current Source
Model
725
MANUAL
MAINTENANCE
/-
5-1.
ment. Follow the step-by-step procedures
5-2.
normal care required for high-quality electronic equipment.
5-3.
regarding component specifications and part numbers. Replace components as indicated
using replacement parts which meet the listed specifications.
5-4.
Model 725. Perform the steps in the exact order given.
5-5.
/--
GENERAL. This section describes procedures for checkout and servicing the instru-
SERVICING
PARTS
CALIBRATION. Refer to Section 6 for step-by-step procedures for calibrating the
TROUBLESHOOTING.
a. T_roubleshooting Guide. Refer to Figure
If
the instrument problem cannot be readily located or repaired, contact a
Keithley representative or the Sales Service Department, Cleveland, Ohio.
SCHEDULE. This instrument requires no periodic maintenance beyond the
REPLACEMENT. Refer to the Replaceable Parts List, Section
SECTION
5.
for
NOTE
TABLE
Test Equipment.
MAINTENANCE.
complete servicing.
6-1
for voltages and test points.
5-1.
7,
for information
Code
Letter
A
B
C
D
E
F
Instrument Type
Multimeter, Digital
Oscilloscope
Variac
Power Line Monitor
Load Fixture
Digital Voltmeter
Specification
Voltage: 50.1% of reading.
Current:
except +0.3% of reading on
lOOmA
DC-450 kHz
0-130 V rms.
105-130
800Q/lOQ - Res
Vol tage:
50.2%
1A
ranges.
V
of reading
,
1
mV/d i v
rms.
i
s
1V
5
50uV
.
tors
Manufacturer
and Model No.
Kei thley, Model
173.
Tektronix,
Model 503
Genera
See Text.
Kei thl ey, Mode
190
1
Rad
i
o
Use
Accuracy check,
General.
General.
Line Regulation
General.
Load Regulation
Load and Line
Regulation.
AA
5
-1
CALI
6
RAT
I
ON
INSTRUCTION
Programmable Current Source
'
MANUAL
Model
R121
BIAS
R182
REFERENCE
725
--.
R226
POWER
SUPPLY
+1ov
XD204-
R203
.IMIT LAMP.
(+I
v
-lov
$0203
R207
AMIT LAMP
(-)V
-
'
-12V ACROSS
C216
R114
AMPLIFIER
ZERO
'
+12V ACROSS
C215
R116 COMP
REFERENCE
-\
6-
0
R30i
COMP1 COMP2 COMP3 COMP4
R302
R303
FIGURE
R304 R305 R307 R312
6-1.
\
R319
(SEE
FIG.7-2)
Chassis
-
*AT ANODE WITH RESPECT TO LOW.
Top
View.
.
AA
INSTRUCTION
Program ma ble Current Source
Model
725
MANUAL
CALI
BRAT
10
N
r
6-1.
ment in order to verify operation within specifications.
6-2.
and calibrating this instrument.
6-3.
ing this instrument. Refer to Figure
brought direct from a not in specification temperature or humidty environment.
exi
/--
GENERAL. This section contains procedures for calibrating and checking the instru-
TEST
If
representative or the Sales Service Department, Cleveland, Ohio. Keithley
Instruments, Inc. maintains a complete repair and calibration facility with
equipment traceable to the National Bureau of Standards.
a. Warm Up For Calibration. One hour is sufficient assuming instrument has not been
b. Perform Calibration procedure in the exact order qiven.
c. Setup. Unless stated otherwise in the procedure, the following Conditions should
st:
EQUIPMENT.
proper facilities and equipment are not available, contact a Keithley
CALIBRATION
1.
Line Voltage Switch:
2. Ambient Temperature: 25'C,
3.
Relative Humidity:
4.
Link connected between LOW and
5.
Unit in
PROCEDURE.
Refer to Table
STANDBY
SECTION
Refer
2
with
6.
CALIBRATION.
5-1
for recommended test equipment for servicing
NOTE
to
Table
6-1
6-1
for testpoint and adjustment locations.
117V,'
50%,
GROUND,
"b"
Current Programmed.
for step-by-step procedures for calibrat-
TABLE
Calibration Procedures.
ipeci
f
i
cat ion
)r
Adjustment
i.
Power Suppl ies.
NOTE:
oscilloscope must be
floated for measurement
of 12V supplies. Line
Voltage:
link between LOW and
GROUND.
NOTE:
used, set LINE SWITCH to
234V.
/+--
DC
voltmeter and
117V.
LINE SWITCH:
If 234V power is
Connect
117V,
Description
Calibrate power supply.
-12 VOLTS
across C216. Adjust potentiometer
~226 for -12V
+12 VOLTS
across C215.
-10 VOLTS
anode with respect to LOW. Ripple
should be less than 20mV p-p.
+10 VOLTS
anode with respect to LOW. Ripple
should be less than 20mV p-p.
6-1.
DC:
Measure~-12V supply
+O.O1V.
DC:
Measure +12V supply
DC:
DC:
Measure
Measure
-lOV
+1OV
at D203
at D204
Measurement
Adjust for voltage
of -1-2v
Ripple should be
less than
Voltage should be
t12V +0.24V. Ripplt
should be less than
3mV
Voltage should be
+1ov
+O.OlV.
p-p.
+1v.
3mV
p-p.
AA
6-1
CALI
B
RAT
10
N
INSTRUCTION
Programmable Current Source
MANUAL
Model
725
Specification
or Adjustment
3.
Amplifier Zero. Short
reference input high to
low. Do not short to
chassis!
c'.
Reference.
d. Bias
TABLE
Calibration Procedures
Descr
Set range to 100nA. Set OUTPUT to
STANDBY. Connect Digital Voltmeter
(A)
across R312. Adjust potentio-
meter
Set range to 10mA. Set reference
to
9.99V.
Connect
potentiometer R182 for
Set OUTPUT to STANDBY and -polarity.
Set range to 100nA. Set reference
9.99V.
to
across
R121 for vgltage 27mV. (This sets
current thru transistors
6-1.
i
p t ion
R144
DMM
R319.
(CON'T)
for zero.
Set OUTPUT to:
(A) across R307. Adjust
Connect Digital voltmeter
Adjust Dotentiometer
+,
,999V
QlOl,
STANDBY
k0.5mV.
4102).
Yeas
u
r
emen
t
idjust for
IV
.
4djust for voltage
0
kO.1
27mV.
e. Compliance
Compliance Reference
Compliance Limits
Disconnect all loads from OUTPUT.
Connect
jacks, Turn R301 fully
lOmA
Set reference to
R116
Set OUTPUT to - Polarity.
Set OUTPUT to
R301 .for desired
Release
Adjust R302 for desired
Release
Adjust R303 for desired
Release
Adjust R304 for des i red
1
imi
DMM
range,
for
COMP
COMP
COMP
t.
to COMPLIANCE MONITOR
CW,
+,
COMP
95
k
1V.
+
land program
2 and program
3
1,
Operate.
9.99V.
polarity. Adjust
COMP 1 limit
and program
Adjust
COMP 2 limit
COMP
COMP
Program
COMP
COMP
3
COMP
4
2.
limit.
3.
4.
IMM
reading should
Ie
95
f
1V.
DMM
reading should
95
5
2e
12V-90V
12V-90V
V-9OV
12
12v-9ov
5V.
6-2
AA
INSTRUCTION
Program ma ble Current Source
Model
725
MANUAL
CALI
BRAT
10
N
f
i
peci
r
.
cat ion
Adjustment
Voltage Limit Lamp
TABLE
Calibration Procedures
Description
Set range to 100mA. Set reference
to 2.00V. Select
Connect Oscilloscope
Oscilloscope Settings:
2 mV/div.
5
Trigger
Input
Connect load resistor. Set
operate. Adjust potentiometer R203
such that the LIMIT lamp turns on whe
the 725 changes from current mode to
voltage mode.
NOTE:
point between current and voltage
modes, adjust the COMPLIANCE can-
trol R301, until the oscilloscope
ripple waveform changes as shown
in Figure
6-1.
mS/div.
To
(CON'T)
+,
Comp
=
INTERNAL
=
AC
COUPLED
determine the crossover
1.
(B)
to OUTPUT.
OUTPUT
6-4.
:asurement
to
EE
FIG.
6-4.
1.
Accuracy.
Set OUTPUT to - polarity. Adjust
potentiometer R207 such that the
LIMIT lamp turns
changes from current mode to vo
tage mode.
Verify the accuracy on each ful
scale range.
Set OUTPUT to STANDBY. Connect
the Digital Multimeter
PUT receptacle as shown in Figure
6-2, Set COMPLIANCE to 90V.
on
when the 725
(A)
to
-
OUT-
AA
6-3
CALI
B
R
AT
I0
N
INSTRUCTION MANUAL
Programmable Current Source
725
Model
Specification
3r
Adjustment
NOTE: Adjustment of R305
(100mA)
compensate for relay contact resistance only.
Depending on actual range
resistor value
and actual relay contact
resistances)
be possible to swing thru
nominal value. Adjust to
as close to nominal as
possible, instrument
still
i f i
cation,
is
intended to
[IOG
it
may not
meet accuracy spec-
&.I%
will
TABLE
Calibration Procedures
Descr
lOOmA
9.99V.
OUTPUT
Repeat for
lOmA
9.99V.
OUTPUT to
Repeat for
1mA
Range: Set reference to
Set range to
to
+.
for
-
100uA Range: Set reference to
9.99V.
OUTPUT
Repeat for
6-1.
i
p
t
ion
Range: Set reference
Set range to 100mA. Set
to
+.
Range: Set reference to
Set range to
+.
Measure current. Repeat
OUTPUT.
Set range to 100uA. Set
to
+.
(CON 'T)
Measure current.
-
OUTPUT.
1OmA.
Measure current.
-
OUTPUT.
1mA.
Measure current.
-
OUTPUT.
Set
OUTPUT
to
Set
9.99V.
Measurement
Nominal current
reading should be
99.9mA
Nominal current
reading should be
9.99mA
Current reading
should be
t0.85mA.
F.085mA.
999.
PA
t8.5~~.
Current reading
should be
k0.085
99.9pA
A.
h.
Line Regulation.
lOuA
Range: Set reference to
9.99V.
OUTPUT
Repeat for
1pA Range: Set reference to
Set range to 1pA. Set OUTPUT to
Measure current. Repeat for
OUTPUT.
lOOnA Range: Set reference to
9.99V.
OUTPUT to
Repeat for
Verify line regulation.
Set OUTPUT to STANDBY. Set
reference to
load resistor between front
panel
Figure
Set COMPLIANCE to 90V. Set
range to 100mA.
Set range to 10uA. Set
to
+.
Measure current.
-
OUTPUT.
Set range to 100nA. Set
+.
Measure current.
-
OUTPUT.
9.99V.
LOW
and OUT.as shown in
6-3.
(Switch closed).
Connect
9.99V.
-
+.
Current reading
should be
t0.085pA.
Current reading
should be
13.5nA.
Current read
shou
1
i0.85nA.
1v
Output.
9.99uA
999.
i
ng
d be 99.9nA
nA
6-4
AA
INSTRUCTION
Programmable Current Source
Model
725
MANUAL
CALI
B R AT
I0
N
f-
pecification
r Adjustment
Load Regulation.
TABLE
Cal i brat ion Procedures
Description
Set line voltage to l05V. Set
OUTPUT
at load. Repeat for
Set Line voltage to 125V
Verify load regulation.
Set OUTPUT to
reference to
range to 100mA. Set
LIANCE to 90V. Set line
voltage to
to
6-1.
(CON'T)
+.
Measure voltage
STANDBY.
9.99V.
11
5V.
-
OUTPUT.
Set
Set
COMP-
Measurement
Output voltage
change should not
exceed 50pV from
115V
Output voltage
change should not
exceed 50pV from
115V
line.
line.
,
Connect load resistor between
front panel
shown in Figure
OUTPUT
change when switch is moved
from closed to open position
at load. Repeat for - OUTPUT.
I
J102
JlO3
LOW
to
+.
Measure voltage
OUTPUT
OR
TRlAX
and
6-3.
1
OUT
Set
as
HI
LO
Voltage change
should not exceed
501iV.
1
173
AA
FIGURE 6-2. Accuracy Check.
6
-5
CALI
BRAT
I0
N
INSTRUCTION
Programmable Current Source
MANUAL
Model
725
VAR
--
~ ~~
I
AC
LINE
POWER
CORD
,----
1
FIGURE
-
6-3.
‘J102
~103
Regulation
OR
TRIAX
SW I TCH
800
Check.
5MS/d
10
a
i
v
6-6
-
FIGURE
VOLTAIGE
6-4.
MODE
Current
Mode
t
Vs.
Voltage Mode
Waveforms.
AA
INSTRUCTION MANUAL
Programmable Current
Model
725
P
Source
SECT
ON
7.
REPLACEABLE PARTS
REPLACEABLE PARTS
7-1,
parts list is arranged in alphabet
7-2. ORDERING INFORMATION. To place an order or to obtain information converning replacement parts, contact your Keithley representative or the factory. See the inside
front cover for addresses. When ordering, include the following information:
7-3.
please complete the Service Form which follows this section, and return
instrument.
7-4.
acturer's designation to Federal Supply code and includes a listing
addresses.
,--
7-5.
GENERAL. This section conta
a. Instrument Model Number.
b.
Instrument Serial Number.
c. Part Description.
d. Circuit Designation (if applicable).
e. Keithley Part Number.
FACTORY SERVICE. If the instrument
CROSS-REFERENCE
COMPONENT
a. PC-226 (Mother Board) for series 100 and 200 circuit designations.
LAYOUTS.
OF
MANUFACTURERS.
ns information for order
cal order of their circu
is
to be returned to the factory for service,
Table
7-1
provides a cross-reference of manuf-
ng replacement parts. The
t
Designations.
it
with the
of
manufacturer's
PC-438
b.
7-6.
circuits for remote ranging and control. Circuit designation series is 100 and 300.
supplies. Circuit designation series is 200.
SCHEMATICS.
a. Amplifier (28680E). This schematic describes the amplifier and the interface
b. Power Supply (23679E). This schematic describes the +130, +12 and
(Relay Board) for series
300
circuit designations.
k10
volt power
AA
7-
1
REPLACEABLE PARTS
I
TABLE
Cross-Reference of Manufacturers
7-1.
INSTRUCTION
Programmable Current Source
MANUAL
Model
725
Fed.
Mfr.
Code Name and Address Code
A1
A-
B
AC
I
AMP
BEC
B
RN
c-
I
len-Bradley Corp.
Milwaukee,
American Components, Inc
Conshohocken,
Ampheno
Broadview, IL 60153
Beckman Inst. Inc.
Fullerton,
Bourns, Inc.
Riverside,
Components, Inc.
Biddeford,
CTS Corporation
Elkhart,
1
WI
CA
CA
ME
IN
53204
PA
92634
32507
04005
46514
19423
SUPPI
01 121
11,298
02660
73
138
80294
06751
71
450
Y
4fr.
:ode Name and Address Code
I
-D
I
RC
K-
KGS
L-
MEP
MOT
Industrial Devices, Inc.
Edgewater, NJ 07020
IRC Division
Burl ington, IA 52601
Keittiley Instruments, Inc,
I
Cleveland, Ohio
Kings Elect.
Tuckahoe,
Littlefuse, Inc.
F
Des Plaines, IL 60016
Mepco, Inc.
Mor
r
i
s
town, NJ 08050
Motorola Semi-Prod. Inc.
Phoenix,
Co., lnc,
NY
AZ
85003
10707
44139
Fed.
Supply
9
1802
07716
80
164
91
836
759
15
3003
1
047
13
Dickson Electronics Corp
Scottsdale,
Dale Electronics, Inc.
Columbus,
Doug1
as
Pawcatuck, Conn. 02891
Electro Cube Inc.
San Gabriel,
Electronic Devices, Inc.
Yonkers,
Erie Technological Prod.
Erie,
Fairchild Inst. Corp.
Mountain View,
Hew
Palo Alto,
PA
1
et t-Packa rd
AZ
NE
Randal
EJY
16512
CA
85252
60601
1
CA
91776
10710
CA
94304
94043
12954
9
1637
14752
83701
72982
07263
50434
NC
I
OHM
PEB
RCA
SPG
T-
I
T
RW
National Components, Inc.
West
Ohmite Mfg. Co.
Stokie, IL 60076
Potter
Princeton, IN 47670
Morrestown,
Palm
Beach, FL
G
Brumfield
RCA
Corporation
EJJ
08050
Sprague Electric Co.
Visalia,
Texas Instruments, Inc.
Dallas, TX 75231
TRW Capaci tor Div.
Ogallala,
CA
NB
93278
69153
44655
12300
02734
14659
01 295
8441
1
7-
2
AA
INSTRUCTION
Programmable Current Source
725
Model
MANUAL
REPLACEABLE PARTS
REPLACEABLE PARTS LIST
Ci
rcui
t
Desig
.
ClOl
c102
c103
C104
C105
C106
C107
C103
c201
c202
c203
C204
C205
C206
C207
c208
/--
C209
c210
c21
c212
C213
C214
c215
C216
c217
C218
I
Description
.0068uF. 600V. CerD
.0022pF. 600V. CerD
.22p~. 50v.
.02pF. 600V. CerD
4.7pF,
4.7pF,
IpF. 200V. My
IpF.
2OOV. My
470pF,
.5l~F. 400V. My
.OOIpF.
.OOIuF. 600V. CerD
140pF. I50V.
140pF. l50V.
IOOuF. 40V. EAL
IOOuF. 40V. EAL
.001~F. 600V. CerD
.OOIuF. 600V. CerD
IOOpF.
4.7uF, 20V. ETT
IOOpF.
.02uF.
IOuF. 2OV. ETT
IOpF. 2OV. ETT
.05uF. 600V. My
150pF. 600V. CerD
MY
.........
.........
20V. ETT
2OV. ETT
..........
..........
...........
...........
IOOOV.
CerD
..........
600V. CerD
EMC
.........
EMC
.........
..........
..........
401. EAL
..........
..........
600V.
CerD
600V.
.........
.........
CerD
..........
..........
..........
.........
"100"
........
........
"200" Series (Sch . 28679E.Pg . 7-13)
........
........
........
........
........
PC-Board
Item
No./
Locat ion Code
CAPAC
I
Series (Sch . 28680E.Pg . 7-12)
(PC-Board 29134D.Pg
TORS
6/03 ERI
5/C5
.
9/c3
7/D4
2O/D5
21/C5
15/D6 POT
-----
(PC-Board 29134D-Pg.7-10)
10/A6
16/64 POT
Il/C2 ERI
12/D2 ERI
25/D2
26/C2
17/64
18/A4
13/84 ERI
14/63
19/C3
22/64
3/64 ERI
3/C4
23/C5
24/C5
-----
4/84 ERI
Mfr
.
.
(C)
.
7-10)
ER
I
T
RW
ERI
c-
I
c-
I
POT 107-21
ER
I
SPG
SPG
AMP
AMP
ER
I
AMP
c-
I
ERI
c-
I
c-
I
SPG
Mfr
.
Des ig
ED-
.
OD68
ED-
.
0022
601PE
ED-
.
02
TSDI-20-475
TSDI-20-475
107-21
DD-471
SMlA
ED-.001
ED-
.
001
Type 630
Type 630
C437AR/G100
C437AR/G100
ED-.001
ED-.001
C437AR/G
TSDI-20-475
EDED.
TSD2-20-106
TSD2-20-106
6PS-550
ED-
100
.
02
150
I00
Kei thley
Part No
C22-.0068M
C22-.0022M
Chi.
C22-
C
C-179-4.7M
C-66C-66-
C-64-47OpF
C-
C-22-.001M
C-22-.001M
CC-
C-150-100M
C-150-100M
C-22-.001M
C-22-.001M
C-150-100M
C-179-4.7M
c-22-
C-22- . 02M
C-179-1
C-
c-62- . 05M
c-22-150P
.
.22M
.
02M
1
79-4.7M
1
M
1
M
11
7.
.
5M
183-
140M
183-
140m
1
OOP
OM
179-IOM
.
"300" Series (Sch
(PC-Board 286GIC.Pg
c301
C302
Circuit
Desig
.
CR301
CR302
CR303
CR304
CR305
CR306
CR307
r
CR308
CR309
CR3
10
CR31
1
IOpF. 2OV. ETT
IpF.
5OV.
CerD
Descr
i
pt ion
Rectifier.
Rectifier.
Rectifier.
Rectifier.
Rectifier.
Rectifier.
Rectifier.
Rectifier.
Rectifier.
Rectifier.
Rectifier.
IA.
IA.
IA.
IA.
1A.
IA.
IA.
IA.
IA.
IA.
1A.
..........
.........
"3DO"
.......
800V
.
.......
800v
.
.......
800V
.
.......
800V
.
.......
8OOV
.
.......
800V
.
.......
8OOV
.
.......
8OOV
.
.......
800v
.
.....
3OOV
.
800V
.
.
*
.
.
4/E4
'
5/84 ERI 8131050651-105M
DIODES
Series (Sch. 28680E.Pg.
(PC-Board 28631C.Pg
PC-Board
Item No./
Location Code Des i g
41/E2
42/E2
h3/E2
44/D2
34/C2
351~2
36/C2
37/c2
38/62
.
.
33/62
*
1
.
40/B2
28630E.Pg.
(CR)
AA
.
7-1
Pic
I
.
7-11)
Mfr
MOT
MOT
MOT
MOT
MOT
MOT
MOT
MOT
MOT
MOT
MOT
7-1
2)
I)
7-1
2)
.
KNSID6BD20K
Mfr
.
1
N4006
1
N4D06
I
N4006
1
N4006
1
N40D6
I
N4006
1
N4006
I
N4006
1
N40D6
1
N4006
1
N40D6
c-
1
79-
10
C-237-1
Kei thley
Part No
RF-38
RF-38
RF-38
RF-38
RF-38
RF-38
RF-38
RF-38
RF-38
RF-38
RF-38
.
7-3
REPLACEABLE PARTS
I
NSTRUCT! ON MANUAL
Programmable Current Source
Model
725
C
i
rcu
i
t
Desiq.
CR312
CR313
Circuit
Desig.
DlOl
D102
0103
D104
DID5
Dl06
~107
DlO8
Dl09
DI
10
DI
I1
DI
12
DI
13
DI
I4
DI
15
DI
16
DI
I7
DI
15
DI
19
Dl
20
Dl21
D122
DI
23
Descr
i
pt ion
Rectifier,
Rectifier,
Description
IlOT
USED
Silicon.
Silicon.
Silicon.
IiDT
Silicon.
Silicon.
Silicon.
Silicon.
Silicon.
Silicon.
Silicon.
Silicon.
PIDT
t10T
NOT
Silicon.
Silicon.
Silicon.
Silicon.
NOT
S
i
1
Silicon.
.
. .
. .
USED
.
.
. . . .
. .
.
. . .
.
USED
USED
USED
.
. . . .
.
. . . . .
USED
i
con.
. . . . . . . .
. . . . . . . .
"300" Series (Sch. 28660E-Pg. 7-12)
IA, 800V.
IA,
. .
. .
.
. . . . .
. .
. . . . .
8OOV.
. . . . . . .
. . .
.
. . .
. .
. . .
. . . . .
. . .
. . . .
. . .
. . . . . .
. . . . .
. . .
.
. . .
. . . . .
.
. . . .
.
.
.
I
. .
. . . . . . .
.
. . . . . . . . .
.
.
. .
.
. . .
,
. . .
.
. . . . . .
. . .
DIODES (CR) (CON'T)
(PC-Board 286CIc-pg. 7-11)
PC-Boa rd
I
tern
No./
Loca
t
i
on
.
45/€4
46/C4
Boa
r
(U)
d
"100"
. . . . .
. . . .
. . . . .
.
. . . .
.
.
. .
. . .
. . . . .
. . .
. . . , .
DISPLAYS
Series (Sch. 28630E-Pg. 7-12)
(PC-Board 29134D-Pg.
PC-
I
tern No./
Loca t ion Code
. .
.
127/C3
128/D3
129/D2
.
.
13O/c5
. . .
131/c5
132/D3
133/D3
134/D4
. . .
135/D4
. .
]36/D4
.
.
I37/C6
. . .
140/C6
. .
141/D6
. .
142/D4
]43/~4
------
, ,
------
Mfr.
Code Desig.
MOT
MOT
7-10)
Mfr.
T-
I
T-
I
T-
I
T-
I
T-
I
T-
I
T-
I
T-
I
T-
I
T-
I
T-
I
T-
I
T-
I
T-
I
T-
I
T-
I
T-
I
T-
I
Mfr.
I
N4006
I
N4006
Mfr.
Desig.
Kei thley
Part
No.
RF-38
RF-38
Kei thley
Part No.
RF-
I4
RF-
I4
RF-
I4
RF-
I4
RF-
I4
RF-
I4
RF-
I4
RF-
14
RF-
I4
RF-
I4
RF-
I4
RF-
I4
RF-28
RF-28
RF-28
RF-26
RF-28
RF-23
7-
4
D20
I
D202
D203
C204
~205
D206
~207
D20C
~209
C i rcui
t
Desig.
DSlOl
"200"
Rectifier, 400mA, 225V
Rectifier, 400rnA, 225V
Zener Diode, 6.2V, 25rnA.
Zener Diode, 6.2V, 25rnA.
Zener,
Zener,
Rectifier, Full-Wave Bridge.
Rectifier, Full-Wave Bridge.
Rectifier, Full-Wave Bridge.
Description
Pilot Light, LIMIT
IIV,
1/4W
IIV,
1/4W
. .
. . . .
. . . . .
. . .
. . .
.
. . .
. . . . .
"100"
. . . .
. . , . . , . . .
Series (Sch. 28679E-Pg. 7-13)
(PC-Board 29134D-Pg. 7-10)
.
. . .
138/B6
.
.
139/B5
27/85
. .
23/B5
29/B4
30/B4
.
. .
144/C2
. .
.
145/A3
.
.
146/C3
DISPLAYS (DS)
Series (Sch. 28680E-Pg. 7-12)
(PC-Boa rd
.
29
134D-Pg .
PC-Boa
rd
I
tern No./
Loca t ion Code Desig.
--__-
T-
TDIC
DI
DIC
DIC
E-D-1
E-D-1
E-D-1
7-
Mfr.
I
-D
I
I
C
10)
I
N645
1
N645
I
N709
I
N709
If1715
Ill715
PF-40
PF-40
P
F- 40
Mfr.
2100
RF-
I4
RF-
I4
DZ-21
DZ-21
DZ-22
DZ-22
RF-46
RF-46
RF-46
Kei thley
No.
Part
p1-33
AA
INSTRUCTION
Programmable Current Source
Model
725
MANUAL
REPLACEABLE PARTS
r
"200"
Circuit
Desig.
F20
I
r
JlOl
J102
Jl03
J104
Jl05
Jl06
Description
Pilot Light, Decimal
Light Emitting
Light Emitting
Light Emitting
Light Emitting
Light Emitting
Light Emitting
Light Emitting
Light Emitting
Fuse,
3AG,
Receptacle,
BNC
Triax.
Receptacle,
Receptacle,
Receptacle,
NOT
USED
Diode
Diode
Diode
Diode
Diode
Diode
Diode
Diode
Slow
Blow,
BNC,
Modulate
.
.
. . .
BNC
Front Panel
BNC,
Rear Panel Out.
BNC,
Front Panel Low
.
. . . . .
"300"
.
. . .
.
I
. . . .
. . . . . . .
. . . . . .
.
. . . . . .
. . .
. . . . .
, ,
. . . . .
"200" Series (Sch. 28679E-Pg. 7-13)
1/4A
"100"
. . . . . .
DISPLAYS (DS) (CONIT)
Series (Sch. 28679E-Pg. 7-13)
(PC-Board 29134D-Pg. 7-10)
PC-Board
Item No./
Locst i on Code
-----
Series (Sch. 28680E-Pg. 7-12)
(PC-Board 28631C-Pg. 7-11)
-_---
. .
.
.
-----
_----
-_---
.
-____
. . .
.
-----
-----
. .
-----
FUSES
(F)
(PC-Board 29134D-Pg. 7-10)
. . .
.
-----
Series (Sch. 28680E-Pg. 7-12)
(PC-Board 29134D-Pg. 7-10)
. . .
CONNECTORS
-----
.
-----
Out.
.
-----
-
-----
.
-----
(J)
Mfr.
I
-D
H-P
H-P
H-P
H-P
H-P
H-P
H-P
H-P
F
L-
AMP
KGS
AMP
AMP
AMP
Mfr.
Desig.
2140 DS201
5032-4657
5082-4657
5032-4657
5082-4657
5082-4657
5082-4657
5082-4657
5082-4657
2100
31-221
19-64-1-9
31-221
31-221
31-221
Kei thle,,
Part
No.
p1-47
p1-65
p1-65
p1-65
p1-65
p1-65
p1-65
p1-65
p1-65
p1-38
cs-
I5
CS-253
c5-15
cs-
I5
cs-
I5
r-
AA
J201
J202
l<30
I
K302
K303
K304
K305
K306
K307
K308
K309
l<3
I0
K31
1
K312
K313
K314
K315
"200" Series (Sch. 28679E-Pg. 7-13)
Binding Post, Ground
Bindinq Post, Rear Panel Low
Relay, Single-pole,
Relay, Single-pole,
Relay, Single-pole,
Relay, Single-pole,
Relay, Single-pole,
Relay, Single-pole,
Relay, Single-pole,
Relay, Single-pole,
Relay, Single-pole,
Relay, Single-pole,
Relay, Single-pole,
Relay, Single-pole,
Relay, Single-pole,
Relay, 4-pole.
Relay, 4-pole.
. . . . . .
"300" Series (Sch. 23630E-Pg. 7-12)
N.O.
. .
H.0.
. . .
N.O.
.
N.O.
.
N.O.
. . . .
N.O.
I
N.O.
. . . . .
N.O.
. .
14.0.
.
N.O.
. . . .
N.O.
. . . . .
N.O.
. . . . .
N.O.
. . . . .
.
. . . . . .
. .
. . . . .
(PC-Board 29134D-Pg. 7-10)
--_--
.
-----
. . .
RELAYS (K)
(PC-Board 28631C-Pg.
.
. .
47/E2
. .
.
.
.
,
I
.
. .
48/E2
49/E2
50/D2
51/03
I
52/C3
53/C3
.
54/C2
55/B3
.
56/B3
57/83
58/C4
.
59/C4
61/E3
.
62/F3
. + . .
. . . .
.
. . . .
H.H.S.
H.H.S.
7-1
D-R
D-
D-R
D-R
D-R
D-
D-
D-R
D-R
D-R
D-
D-R
D-
D-R
D-R
I)
1517
1517
375-670
R
R
R
R
R
375-670
375-679
375-370
375-670
375-670
375-670
375-670
375-670
375-670
375-670
375-670
375-670
-----
-----
BP-I
IB
BP-IIC
r1-40
r1-40
r1-40
r1-40
r1-40
r1-40
r1-40
r1-40
r1-40
r1-40
r1-40
r1-40
r1-40
r1-58
r1-58
7-
5
REPLACEABLE PARTS
INSTRUCTION
Programmable Current Source
MANUAL
Model
725
Circuit
.
Desig
P20
1
Ci
rcu
i
t
Desig
.
QlOl
Q102
Qlo3
Ql04
Ql05
Ql06
QI
07
Ql08
QlO9
QI
10
Qlll
Q112
Ql
13
QI
14
Q115
QI
16
QI
I7
Ql
18
Ql
I9
"200" Ser
Description
Power Cord. 6 feet
Description
Selected
NPN
NPN. Case TO-I06
NPN.
Selected
PNP.
PNP. Case TO-92
PNP.
PNP.
PNP.
Silicon
NPN.
NPN. Case TO-I06
Silicon
NPN.
Silicon
Silicon
Selected
NPN.
.............
................
Silicon. TO-5 Case
.............
Case TO-110
Case TO-92
Case TO-92
Case TO.92
..............
Case TO-I06
..............
Case TO-I06
..............
..............
.............
Silicon
.............
"100"
.........
......
.........
..........
..........
..........
..........
.........
.........
.........
...........
"200" Series (Sch
CONNECTORS (P)
I
es (Sch . 28679E.Pg
(PC-Board 29 134D.Pg
PC-Boa rd
I
tern No./
Loca
TRANS I STORS (Q)
Series (Sch . 286GOE.Pg . 7-12)
(PC-Board 29134D.Pg
PC-Board
I
tern No./
Loca t ion Code Desig
.....
175/c3
159/C3
176/D3
.....
156/D3
169/c5
170/C6
171/Dh
172/D4
180/D5
160/D4
161/D5
180/D5
162/D4
157/D4
158/D4
181/D5
166/D6
(PC-Board 29134D.Pg
.
7-1
7-
10)
.
7-10)
.
I
I
I
I
I
I
I
I
1
I
7-10)
3)
Mfr
4638-
Mfr
.....
MM3003
2N3565
MM4003
.....
2N3638
2N 3905
2N3905
"905
2N3905
A642L
2N3565
2N3565
A642L
2N3565
2N3638
2N3638
.....
2N3903
.
t
i
on Code Desig
Mrr
E-C-1
.
Mfr
K-
MOT
F-
MOT
K-
F-
MOT
MOT
MOT
MOT
AMP
F-
F-
AMP
F-
F-
F-
K-
MOT
.
28679E.Pg . 7-13)
.
.
.
.
I3
.
Kei thley
No
1
.
ey
.
Part
c0-5
Ke f th
Part No
24560A
TG-58
TG-39
TG-59
24560A
TG-33
TG-53
TG-53
TG-53
TG-53
TG-64
TG-39
TG-39
TG-64
TG-39
TG-38
TG-38
24670A
TG-49
.
.
7
-6
Q20
1
Q202
Q203
Q204
Q205
0206
7
Q20
Q208
a209
4210
Q211
1
Q30
Q401
Q402
QA20
1
QA202
PNP.
Case T0.92
PNP Silicon. Case TO.92
PNP.
Case T0.92
PNP.
Case T0.92
NPN.
Silicon. Case TO-92
Silicon.
Silicon.
PNP.
Silicon. Case TO-39
NPN.
Case TO-5
PNP. Case TO-5
PNP. Case TO-5
NPN,
Case T0.92
Selected
Selected
Integrated Circuit
Linear Integrated Circuit
.....
.
.....
.....
NPN.
TO-5
TO-5
...
. a .
NPN.
.....
.
.
I
I
.
.....
..........
.............
.............
........
.....
.....
.....
.....
.....
.....
.....
.....
*
.
173/B6
17j'/B6
174/B4
179/B4
167/B4
164/86
165/A5
178/A4
163/B4
.....
.....
"300" Series
"400" Series (Sch
. .
168/B3
(PC-Board 28681C.Pg
(PC-Board 29134D.Pg
I
.
(Sch
60/C4 MOT 2N3904 TG-47
183/D5
182/D5 K-
36/84
.
37/83 MOT
MOT
MOT
MOT
MOT
MOT
RCA
RCA
MOT
RCA
RC
RCA
,
28680E-Pg .
.
28600E.Pg
K-
F-
A
.
7-1
.
7-10)
I
I
I
7-
I)
.
7-
2N3905
MM4003
2N3905
2N5087
2N3905
40346
40346
MM4003
17
403
40319
40319
12)
12)
.....
.....
65R7723393A723C
MC
1439C IC-I3
TG-53
TG-59
TG-53
TG-61
TG-49
TG-44
TG-44
TG-59
TG-43
TG-50
TG- 50
28569A
28569A
I
C-14
....
AA
INSTRUCTION
Programmable Current Source
Model
725
MANUAL
REPLACEABLE PARTS
/-
C
i
rcu
i
r
r
t
Oesig.
RlOl
R102
RI
03
R104
~105
R106
RI
07
~108
RI
09
RI
I0
RIII
R1
12
RI
13
RI
14
~115
R116
RI
I7
RI
18
RI
19
RI
20
RI
21
RI
22
RI
23
RI
24
RI
25
RI
26
R127
R128
RI
29
R130
R131
RI
32
RI
33
R134
Rl35
RI
36
RI
37
RI
38
RI
39
RI
40
R141
R142
RI
43
R144
R145
R146
RI
47
RI
48
RI
49
~150
R151
52
RI
RI
53
RI
54
RI
55
RI
56
R157
RI
58
Rl59
R160
R161
R162
R163
Oescr i pt
IZKR,
lo%,
NOT
USEO
NOT
USED
1006,
lo%,
180R,
lo%,
470j2,
lo%,
NOT
USEO
NOT
USED
NOT
USEO
37.4K0,
40212,
I%,
402C,
I%,
loon,
lo%,
15KQ,
I%,
5.49K0,
2K0,
20%,
NOT USED
5.lKQ,
22K0,
10K0,
IKR,
8.2K0,
3900,
3900,
4.7K0,
ZOKR,
20K9,
20K1!,
ZOKbl,
2.2Kn,
20KL2,
20K0,
49.9K61,
20K0,
20Kj2,
100K12,
NOT USED
NOT USED
NOT USEO
1000,
182Kn,
182K0,
IOKI2,
50062,
49.9K0,
49.9Kn,
10K0,
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED
NOT
NOT USED
NOT
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED
NOT
NOT USED
NOT
I%,
lo%,
lo%,
20%,
lo%,
lo%,
lo%,
lo%,
I%,
1%,
I%,
I%,
lo%,
I%,
I%,
I%,
1%,
I%,
lo%,
I%,
I%,
lo%,
20%,
lo%,
USED
USED
USED
USED
i
on
1/2W, Comp
1/2W, Comp
1/4W,
1/2W, Comp
I%,
1/8W,
1/8W,
1/8W,
1/2w
1/8W.
I%,
1/8W
2W,
WW
3W,
1/2W,
1/2W, Comp
2W,
WW
1/2W, Comp
1/2W, Comp
1/2W,
1/2W, Comp
1/8W,
1/8W,
1/8W,
1/8W,
1/2W,
1/8W,
1/8W,
I%,
1/8W,
1/8W,
1/8W,
1/8W,
1/2W,
1/8W,
1/8W,
1/2W, Comp
3/4W,
1%,
1/8W,
I%,
1/8W,
1/2W, Comp
Comp
MtF
MtF.
. .
.
WW.
Comp
Comp
MtF..
MtF.
MtF
MtF
MtF
MtF
MtF
MtF
MtF.
"100" Series
. , . . . .
. .
,
. . .
. .
. . . . .
MtF
. I . . .
. . . .
. . . . .
.
, ,
. . .
. . . . .
. I .
. . . . . .
. . . . . .
.
.
.
-
. .
. . . .
.
I I
. . . .
.
. . .
. . , .
. . . .
.
.
,
.
. . .
.
. , .
. .
. + . . - .
Comp.
,
. . . . . . . . 113/D4
.
. .
.
. . . , .
.
. .
I
. , . .
MtF
. . . I . .
. . .
Comp
. . . . .
MtF.
. . . .
MtF.
* *
a
.
Cermet
. . . . . .
. .
MtF
.
I
MtF
. .
. . . . .
. . .
RES I STORS (R)
(Sch.
(PC-Board 291 340-Pg.
PC-Board
Item
Loca
28680E-Pg.
No./
t
ion
,88/C3
, , ,
.61/D2
, ,
,
.95/D2
68/03
I
.
.
.99/C5
. .
.
.
I
.
*
.
.
. .
.89/C3
.81/C3
. .
.147/D3
.
.8O/D4
.66/D4
, ,
.
.
.76/D4
,
,109/D5
-
. .
.73/D4
. . .
.
119/C5
98/C5
62/c5
108185
lO6/C6
149/C5
126/96
67/D4
llO/D5
lll/D5
112/D4
114/D5
12O/D5
, . ,
I
.
.
. .
, ,
. . .
.
.115/D5
I
.
. . .
*
.
.
I
1161~5
123/C6
.94/E5
124/D5
*
125/D5
82/E5
153/D5
122/D6
121/D6
.83/D5
. . .
. .
. . .
7-12)
7-10)
Mfr.
Code
A-B
A-B
A-B
A-B
I
RC
I
RC
I
RC
A- B
I
RC
I
RC
CTS
OHM
A- B
A-B
CTS
A-B
A-B
A-B
A-B
I
RC
I
RC
I
RC
I
RC
A-B
I
RC
I
RC
I
RC
I
RC
I
RC
I
RC
A-B
I
RC
I
RC
A-B
BEC
I
RC
I
RC
A-B
Mfr.
Oesig.
EB
EB
CB
EB
CEA
C
EA
C
EA
EB
C
EA
CEA
INS115
200
EB
EB
INS115
EB
EB
EB
EB
C
EA
C
EA
CEA
CEA
EB
CEA
CEA
C
EA
C
EA
CEA
CEA
EB
CEA
C
EA
EB
77PR500
CEA
CEA
EB
Kei thley
Part
No.
R-l
-I
211
R-
1-100
R-76-
180
R-
1-470
R-88-37.4K
R-88-402
R-88-402
R-I-
100
R-88-
15K
R-88-
5.49K
RP-50-2K
R-173-5.1K
R- 1 -22K
R-I-
I
OK
RP-50- 1 K
R- 1 -8.2K
R-
1-390
R-
1-390
R-
l-4.7K
R-88-20K
R-88-20K
R-88-
20K
R-88-20K
R-
1-2.2K
R-88-20K
R-88-
20K
R-88-49.9K
R-88-20K
R-88-20K
R-88-
IOOK
R-I-
IOOK
R-88-
l82K
R-88-182K
R-
I-
10K
RP-64-500
R-88-49.9K
R-88-49.9K
R-I-
10K
AA
7-7
REPLACEABLE PARTS
INSTRUCTION
Programmable Current Source
MANUAL
Model
725
Ci
rcu
i
Desig.
R164
R165
R166
RI
67
R168
R169
RI
70
R171
RI
72
RI
73
R174
Rl75
RI
76
R177
R178
R179
R180
R181
R182
R183
R184
R185
R186
RI
87
R188
R189
RI
90
R191
R192
Rl93
R194
R195
RI
96
"100"
t
Description
NOT
USEO
NOT
USED
NOT
USED
NOT
USED
NOT
USEO
NOT
USED
NOT
USED
NOT
USED
NOT
USED
NOT
USED
NOT
USED
NOT
USED
NOT
USED
NOT
USED
NOT
USED
NOT
USEO
NOT
USED
IKn,
I%,
20%,
I%,
USED
USED
USEO
USED
USED
USED
USED
USED
USED
USED
10%.
I
lo%,
lo%,
1/8W,
-,
200n,
4.99KR,
NOT
NOT
NOT
NOT
NOT
NOT
NOT
NOT
NOT
NOT
220~.
220R,
3.3R,
MtF
2W,
1/8W,
I/%/. ComD.
1/2W, Comp.
1/24, Cornp.
. . . . . . . .
WW.
,
MtF.
.
. , . . .
. . .
. . . . .
I
I
RESISTORS (R) (CONIT)
Series (Sch. 28680E-Pg.
(PC-Board 291340-Pg. 7-10)
PC-
Board
Item No./
Loca t ion Code Desig.
lOl/D4
.
152/D3 CTS
105/E3
,
. .
64/D4
.
65/C5
-----
.
. .
. . . .
Mfr.
I
RC
I
RC
A- B
A-B
A-B
7-12)
Mfr.
CEA
1NS115
CEA
EB
EB
EB
Kei thley
Part No.
R-88-
1
K
RP-50-200
R-88-4.99K
R-
1-220
R-
1-220
R-
1-3.3
7-
a
R20
1
R202
~203
R204
~205
R206
R207
R208
R209
R210
R211
R212
R213
R214
R215
R216
R217
~218
R219
R220
R22
1
R222
11223
R224
~225
4.7Kn,
6.8Kn,
ZKR, 0.1%, 1/2W, Cornp
4.7Kn,
2.2KG,
IKR,
2Kn,
2.2Kn,
56Kn,
IOKR,
IOKn,
47Kn,
56KQ,
47Kn,
NOT
NOT
NOT
NOT
NOT
NOT
6.04Kn,
IKO,
IKn,
USED
USED
USED
USED
USEO
USED
1.8Kn,
120,
lo%,
lo%,
lo%,
lo%,
lo%,
1/2W, Comp
O.l%,
lo%,
lo%,
lo%,
108,
lo%,
lo%,
lo%,
108,
1/2W, Comp
102,
1/2W, Comp
lo%,
lo%,
1/2W, Cornp
I%,
1/2W, Comp
1/2W, Comp
1/2W, Comp
1/2W, Comp
1/2W, Comp.
1/2W, Comp
1/2W, Comp.
1/2W, Comp.
1/2W, Comp.
1/2W, Comp.
1/2W, Comp.
1/2W, Cornp.
1/2W, Comp
1/8W, MtF.
"200" Series (Sch
(PC-Board 29 1340-Pg. 7-10)
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28679E-Pg .
77/B5
79/B5
15O/B5
78/84
74/85
69/85
151/B5
75/B5
92/A5
85/85
86/B4
90/A5
93/A5
91/A5
70/B'+
71/84
72/C4 A-B
60/B4 A-B EB
lO7/C4
A- B
A- B
---
A-B
A-B
A-B
----
A-B
A-B
A-
B
A-B
A-B
A-
B
A-
B
A-B
A-B
I
RC
7-l3)
EB
EB
SPECIAL
EB
EB
EB
SPECIAL
EB
EB
EB
EB
EB
EB
EB
EB
EB
EB
C
EA
R-1-4.7K
R-
1
-6.8K
R-67-2K
R-
1
-4.7K
R-
1-2,2K
R-I-IK
R-67-2K
R-I-2.2K
R-1-56K
R-
1
-
1
OK
R-I-IOK
R-
1
-47K
R-
1
-56K
R-
1
-47K
R-I-IK
R-1-IK
R-l-l.8K
R-1-12
R-88-6.04K
AA
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