NOOEL 241
CONTESTS
CONTENTS
7
section
SpEi-IF*C*TIi)NS ____________--_---_----------------------- ii
1. GESE&AJ DESCRIPT~OA----------------------------------------
2. OPERATIOS--------------------------------------------------
3. CIRCUIT
4. MAINTENANCE------------------------------------------------
5. REPMCEI\BLE PARTS------------------------------------------
SCHEMATIC--------------------------------------------------
~ESCR~pT~ON----------------------------------------
Page
1
3
4
6
7
15
0472
i
SPECIFICATIONS
SPEClFlCATlONS
OUTPUT:
Voltage 0 to 1OW vdfs de in 0.01~volt steps.
Current: 20 milliamperes dc maximum.
Polrrlly: Posiiive or negative.
Floaling: WI volts maximum ofi chassis ground.
ACCURACY: aO.05gk of dial setting or 4 millivolt. whichever iS
greater.
RESOLUTION: A “Trim” potentiometer permits interpolation
between sleps with a resolution of betler than 1W microvoI1s.
TEMPERATURk COEFFICIENT OF REFERENCE: &lo Ppm/T.
LINE RLGULATION: *O.WS% or 1 millivolt for 10% line change.
LOAD REGULATION: ~O.OOSqb,rom”o,oad tofull bad.
RIPPLE AND NOISE: Less than 1 millivolt rms above 5 cps.
OUTPUT IMPEDANCE: Less than 0.05 ohm at dc.
RECOVERY TIME: No load to full load. less than 1 second lo
OVERLOAD PROTECTION: Ovtwt is disconnected within 50
millisecondsif currsn~axseedi.pploximately24 milliamperes.
CONNECTORS: Output: Tefkninrulated UHF type.
POWER: 105.125 or210.250 VD,~S. 60.60 cps. IOS watts.
DIMENSIONS. WEIGHT:l’high x Wwidsx12’deep; netweight.
25 pounds.
ACCESSORIES SUPPLIED: Mating co”“estors.
ACCESSORIES AVAILABLE:
Model 1491 End Frames:
adapts Model 241 for bench “se
MODEL 241
.
ii
0372
MODEL 241
GENERAL DESCRIPTIOS
SECTION 1.
GENERAL.
l-l.
secondary standards that employ mechanical choppers
and standard cells.
and calibration, long term stability LO voltage or
temperature variations, and immunity to shock and vibration. The 241 complements the popular Keithley
240 Supply. offering
current output and floating operation.
APPLICATIONS. Include calibrati.” of meters,
1-2.
transducers, and paver supplies: testing insulation,
diode, and capacitor leakage resistances; measuring
dc amplifier gain. linearity, drift and common mode
EjeCtiO”.
voltsge reference for analog camputors, and excitation
potential for photo-cells and ion chambers.
FEATURES.
1-3.
Extreme stability of 0.005% per hour is gained
8.
by using, as a reference standard, a highly stable
zener diode with a” ambient temperature coefficient
of less than 0.001% per degree C.
by rough handling or shock and cannot be damSed in
ordinary use.
designed photo chopper of indefinite life, havi”8 “a
The Model 241 is the successor to dc
If offers freedom from adjustment
greater
It can also be used as a
The cmparat”r device is a Keifhley-
accuracy, regulation,
voltage
1t is unaffected
GENERAL DESCRIPTION
comparator,
moving parts and requiring no maintenance.
b. High output accuracy within 0.05% is assured
through the “se of encapsulated wire-wound resistors
with 0.02% divider accuracy.
C. From O-1000 volts at up to 20 milliamperes -
plus, minus or floating - ca” be dialed in 100, 10, 1.
0.1 and 0.01 volt steps with 5 calibrated panel
switches. “TRIM” potentiometer permits interpolation
between steps with B reeolutia” of better than 100
microvolts.
d. Noise and hum are belw 1 millivolt nos. Lo”
line transients - excellent line regulation - make the
241 ideal for capacitor and diode testing. meter cali-
bration.
e. Overload protection is accomplished by a fastacting relay circuit which disconnects the output witbin 50 milliseconds at about 24 milliamperes. A “RESET”
front panel button reatores operation.
f. Other features include “STAM)BY” which removes
voltage from the output, making possible connections
while the instrument is operating; bench or rack op-
eration.
0472
GENERAL DESCRIPTION
MODEL 241
TABLE l-l.
Front Panel Controls
I
Control Functional Description
OUTPUT Switch Sl
OUTPUT VOLTS
s3
S4
S5
S6
s7
CALIBRATE Control It109
RESET Switch SZ
OVERLOAD Indiearor DS-3
Power Indicator US-1
READY Indicator DS-2
TRIM Control P.151
sets 0"Lp"t on.
Sets output in 1oov increments.
sees oucpu’t in IOV increments.
sets OUtpUt in 1v increments.
sets OUrpUt in O.lV increments.
sets O”CP”L in p.01v increments.
Adjusts output calibration.
Overload reset control.
Indicates overlo& condition.
Indicates parer on.
Indicates ready condition.
kdjuata output up to 15 mV.
I
READY
INDICATOR CONTROL
DSZ RI09
2
CALIBRATE
TRIM
CONTROL INDICATOR SWITCH
R151(SS)
FIGURE 2.
POWER OUTPUT
DS 1
Front Panel
Sl
RESET
SWITCH
s2
OVERLOAD
INDICATOR
DS3
0472
WDEL 241
(2t
OPERATIOS
SECTION 2. OPERATION
2-1. OPER4TING CONTROLS.
8. output volts.
the panel permit setting the voltage directly from
zero to 1000 volts with en accuracy of 0.05% or 1
millivolt end e resolution to 10 millivolts.
b. Trim.
tinge is possible with the TRIM control which Is below the wltage dials.
net to the OFF position when not in use to avoid inBCCUrate o"tp"t.
C. Calibrate. The calibration Potentiometer is
available from the front panel and is covered with en
acorn nut to prevent inadvertent operation. The instrumenr is set to well within 0.05% accuracy et the
factory. However, since the linearity of the output
is within 0.02%, if the user he8 a potentiometer of
thie accuracy available, it is possible to see the
calibration more closely for specific needs. This
control, however, should not be touched unless proper
calibration facilities ere available. Bee mainten-
*nce section).
d. Power Off - Standby - Output On. This switch
turns on the power, places the instrument in STANDBY
ower on but potential disconnected from the outp"t
minals), and turns on the output terminals.
2-2. CONNECTIONS, POLARITY AND FLOATING OPERATION.
The output connectors ere located et the rear of the
instrument.
the positive and one for the negative line. A sharting cap ie provided so that either the positive or
negative Line may be grounded to the cese. Thus, if
the shorting cap grounds the negative line, the remining cmmecror has its center terminal at plus pclarity, end the negative terminal is on the shell of
Extrapolation between 10 millivolt eet-
Two output connectore ere used, ‘x,e for
The five skirted dials ecrose
The TRIM control should be
the connector. If the shell grounds the other con-
nector, the oppoeite holds true. Floating operation
is permiesible provided that potential of either line
to the cede doe8 not exceed 1500 volts. For floating
operation, remove the ehorting cap and use two aep-
arate coaxial cables, one for plus end one, for minus.
Due to the high potentials the ueer is cautioned to
"se connectors end shielded coaxial cable only.
2-3.
PRELIMINARY OPERATING PROCEDURE. The Model
241 Regulated High-Voltage Supply is shipped complete
with tubes and fuses and is accurately calibrated at
the factory. Plug the power cord into a source of
proper voltage and frequency. Unless otherwise spec-
ified, the unit is wired for 117V. 50 to 60 cps. For
220 volt operation change the jumpers on the tre,,sformer primary ae indicated in the schematic diagram.
After the connections have bee,, made, turn inetrument
to STANDBY. The pilot light will go on but the READY
light will be delayed by the internal time-delay relay for 30 seconds. After rhie time, the READY light
will go on, end the instrument is ready to operate.
If the instrument is immediately turned to the ON
position, the OVERLOAD light will go on with the READY
Light, and it will be necessary to operete the RESET
button to make voltage appear et the output terminals.
2-4. OVERLOAD
supply is exceeded by more than approximately 4 milli'
amperes, the overload circuit will disconnect the output in about 50 milliseconds turning on the red OVERLOAD light. To restore operation press RESET button.
If the OVERLOAD light refuses to go out, or the relay
charters when the reeee button is pushed, either the
supply has become defective or the overload is still
present. DO NOT PRESS RESET BUTTON MORE
TARILY TO AVOID DAMAGE
CIRCUIT.
If the current rating of the
THAN
TO
POWER SUPPLY.
MOMEN-
0472 3
CIRCUIT DESCRIPTION
MODEL 241
SECTION 3. CIRCUIT DESCRIPTION
0
3-L. GENERAL,.
In Figure 3, two cascaded electronic
series regulators furnish e high degree of load end
Line regulation. The first regulator reduces the effect of input voltage change while the second eegu-
e. The remainder of the circuit is e high gain
feedback amplifier. Point 35, es mentioned above, is
meinteined et ground by the feedback action. This
occurs because of the following:
lator provides e means for varying the output voltege.
i
It provides e Low output impedance, end very close regulation.
Reeis,toee Rl end R2 compere the output voltage against e silicon voltage etsnderd. By varying
Bl the voltage may be msde to essume eny voltage be-
tween zero end 1000.
The current supply to the
ref-
erence Is doubly regulated. Relays RYl end RY2 ere
overload protectors and RY3 end RY4 provide a 30-sec-
and time delay on turn on.
1. If point 35 is not et ground, the light modulator convert8 the voltage iato en ec signal which
is amplified by the two sections bf VlO. The eignel is then demoduleted by synchronous demodulator
D13-D16.
The resultant dc signal is filtered by
R147 end Cl24 and applied to pin 7 of Vll. The signal is further amplified by VL1 end V5 end applied
to the control grid of V3. The signal will be of
such polarity as to return point 35 to exactly zero
3-2. DETAILED CIRCUIT DESCRIPTION.
volts.
VlO
At frequencies higher then e few cycles,
and the essociated modulator are not operative
end in such e ceee the error signa& proceeds directly
to
8. Refer to,DR L3333D at the rear of thle manual.
The high voltage output of the transformer. Tl is
rectified and supplied to the plste of V2, the series
tube in the pre-regulator. V4 compares a fraction of
pin 2 of VLl end by-passes the modulator. CL3D
by-psssee the comparison divider end increases the
signal et high frequencies, which peeees into pin 2
of vu.
the pee-regulated volcege from the divider network
R127. to R129 and R131 to the 150 volts of V6. This
regulator supplies approximately 1200 volte to the
final regulator.
2. Several safeguards are incorporated
into
the
circuit et this point. 012 end RLO-7 ere connected
between ground and the summing node, point 35. D12
is e silicon diode which is normally open but con-
b. The final regulator consists
amplifier V5 difference amplifier
stabilizing amplifier consisting of light modulatora
(Keithley 15101, a two stege amplifier
ma+Lstor D13 to D16.
of
series tube V3,
VU,
end B drift
VlO,
and de-
ducts if the euraning point is carried more then 0.7
volt positive due to e transiene. This protects the
voltage reference diode.
RYL is the overload re$
It is shunted by R136 to eet its pull in sensitiv
et approximetely 24 milliamperes. When en overload
f
occure end RYL does pull in, it breaks the self-
C. A very stable 9 volt potential is obteined st
point 29 from the zener reference standard. The zener
element is operated et ite rated current end obtains
this curreat regulated to better than 1% from the casceded VR tubea V7,
VS.
end
V9.
To accomplish this,
RI11 is provided to adjust the rated current through
the zener, the link beween points 27 end 28 is removed
and e 1/4X toler&ce 10 ohm resistor is put at this
point.
With an accurate voltmeter, Rlll is adjusted
until the voltage scross the 10 ohm reeistor correeponds to the product of rated current x 10 ohms.
holding contact on RY2 causing it to open.
To
re-
etore operation, RESET switch SW2 is pushed to mo-
mentarily reclose the RY2 self-locking
circuit.
The
OFF, STAND BY, WTPUT ON switch, SWL, also operates
RYZ opening it In the STANDBY position by interrupting the holding
circuit
ot RY2 by means of its first
deck between points 25 end 38. SW1 re-energizes RY2
in the OUTPUT ON position. RY4 is a 30-second therme1 time-delay which ie recycled by RY3. If RY3 is
not energized, RY2 cannot close, end the circuit remains in the overload or standby position.
d. The voltage from the zener is compared against
the output voltage by means of RlOS, RL09, end RllO
(these resistors correspond tp Rl of Figure 1). Since
the ection of the feedback amplifier is to maintain
point 35 exactly et ground; resistors RLOS through RllO
ere adjusted so that exactly 1 milliempere of current
flows into point 35 from the zener. This current must
now flow into R151 end through R153 to R182. Since
these reeietore ere connected between point 35, which
the feedbeck meintsins at ground end the high voltage,
the output voltage must aeeume a value of 1 milliampere
times the value of resistance chosen by the voltage
dials which select resistors RI51 and R153 through
RLS2. It is so arranged that the output voltage equals
one volt per thousand ohms connected between point 35
end ground.
4
3. After the signs1 is amplified by Vll. it is
further amplified by V5.
This tube ia srrenged to
eupply driving voltage to V3 eo that the supply ten
cover a range of 0 to 1000 volts. To do this the
place supply must vary over a range of about minue
50 to plus 950 volts. Therefore, the cathode of V5
is returned to minus LO5 volts. The screen of V3 is
supplied with e floating 105 volts bootstrapped to
the cathode of V3.
In this way a conetent ecreen-tOcathode voltage is maintained, end the tube operates
es a pentade. The advantage of this connection la
that much less grid swing is required over the op,-
eratina range. and the ac plate impedance of V2 is
markedly increased. This results in e higher degree
of output isolation from input transients.
8
0472
MODEL 241
L---&,&&d-
“OLT ,
-105 ’
CIRCUIT DESCRIPTION
+
PUT
I ’
FIGURE 3.
HI
:EIYHLEY
“kr
* ‘v!
Simplified Circuit Diagram.
0472
5
.
MAINTENANCE
SECTION 4. MAINTENANCE
Be extremely careful that the regulated power
supply is disconnected from the power line when
unscrewing the tap or bottom covers. Many cirwit components are 1000 volts or more above
ground. When the circuit is on negative polarity,
the minus side of the circuit is 1000 volts below ground. Therefore, do not ass"me it is safe
to touch any part of the circuit when the parer
is on.
4-1.
TUBE REPLACWENT. Tube replacement is non-crit-
ical.
However, Ampere type ECC B3/12AK7 Is recorrnend-
ed for VlO and Vll.
4-2.
ZENER REFERENCE. This element should not require
replacement. If, however, it is necessary, first re-
move test jack jumper at poinr 28 end 27. Insert a
114% 10 ohm resistor, and adjust Rlll until the voltage ecross the resistor is exactly the product of
rated current rimes resistance. The", measure the
voltage s.cross the reference. Since the tolerance of
the zener elements is 8.45 t" 9.45 volts, RllO is selected so that the sum of RlOB, R109 (set at half value
equal ea 50 ohms) and RllO equals in K ohms the voltage
as closely as possible. Therefore, if the reference
is changed, RllO will have to be changed.
RECALIBRATION.
4-3.
bration be adjusted initially at 500 volts curp"t and
then checked at several voltages above and below this
point. The equipment used at the factory is a Leeds
and Northrup
Type
Volt BOX. This equipment has a range of 0 to 1500
volts and a" 0.035% limit of error.
4-4.
TROUBLESHOOTING.
is recommended: CAUTION:
VOLTS DIALS TO MAXIMUM READING:
1. NO output: With extreme care and a voltmeter
which will read at least 2100 volts dc, measure the
CAUTION
It is recommended that the cali-
K3 Potentiometer, and a Model 7592-S
The f,,llawing general procedure
"HEN TROUBLESHOOTING, TURN
MODE. 24,
voltage at the plate of V2. It should be about 1700
volts.
If it is not this voltage plus or minus 202,
check the input rectifiers and filter capacitor.
2. If this point checks, next check the voltage
et the cathode of V2.
YOlCS.
If it is much lower, either
This should be about 1203
V2, V4
or pcs-
sibly V6 is defective. If changing these tubes does
nor correct the difficulty, measure the voltage at
pin 5 of V4. If the voltage is about 150 but the
voltage ac pin 3 of
V2
is still incorrect, either
R127, R12S. R129 or R131 may be defective.
3.
If the voltage is correct up to here but 5.r
not correct at the output, ground pin 7, "11. If
approximately the correct voltage is not obtained at
the outpue, the trouble is in the modulator cirxtit.
The tube and the other components of that circcit
should be checked.
4.
If the modulator is not at fault, Cry changing
tubes in the remainder of the circuit. CAUTIOX: DO
NOT CHANGE TUBES "ITS POWER ON.
5.
If this does not eliminate the fault, check
the standard resiscar string far a" .,pe" circuir,
and check the ze"er diode for the correct voltaje.
6. Finally, if the cause is still not discovered,
"ifh the voltage dials at their maximum setting.
connect a voltage source Of low internal impedace
at point
35.
Effectively, this shorts out the feedback. If the instrument is ope:~tional, a smalL
variaeian in this voltage will drive the output full
scale (zero to 1000 volts). Since there is a d+feet in the system. the signal will not affect the
outpllt.
potentials progressively along the
However, by
measuring
the plate and grtd
circuit,
the
point can be found where no signal is being trw-
mitted.
In this way the defective component caa be
located.
NOTE
Periodically burnish relay contacts for lover
noise and increased stability.
6
0472
MODEL 241
REPLACMLE PARTS
SECTION 5.
REPLACEABLE PARTS LIST: This section contains
5-1.
a list of components used in this instrument for
wee reference. The Replaceable Parts List describes
the Individual parts giving Circuit Designation.
Description, Suggested >lanufacturer (Code Number),
Abbreviations end Symbols
A
CbVar
Cl?dl
Cer Trimer
camp
DCb
fksig.
F.&A
ETB
ETT
ampere
Carbon Variable
ceramic Disc
Ceramic Trimmer
composition
Deposited Carbon
Designation
ElecCralytic, Aluminum
Electrolytic, tubular
Electrolytic, tantalum
F
Fis
GCb
k
M
Mfr.
MtF
MY
NO.
REPLACEABLE PARTS
Manufacturer's Part Number, and the Ksithley Pert
Number.
where applicable. The complete name and address of
each Manufacturer is listed in the
Listing following the parts list.
TABLE 5-1.
farad
Figure
Class enclosed Carbon
kilo(l0 3,
micro (10-6)
Meg (106)
Manufacturer
Metal Film
Mylar
Number
Also included is a Figure Reference Number
R
FC
Poly
Ref.
TCu
"
"
ww
WV*=
CODE-TO-NAME
ohm
pica (10-12)
Printed Circuit
Polystyrene
Reference
Tinner Copperweld
volt
watt
Wirewound
Wirewound Varieblf
5-2. ELECTRICAL SCHPIATICS AND DIAGRAMS. Schematics
end diagrams are included LO describe the electrical
circuits es discussed in Section 3.
5-3. HOW
TO
"SE THE REPLACEABLE PARTS LIST. This
Parts List is arranged such that the individual types
of camponents are listed in alphabetical order.
Main
Chassis parts are listed followed by printed circuit
boards and other subassemblies.
HOW
TO
5-4.
ORDER PARTS.
8. Replaceable parts may be ordered through the
Sales Service Department, Keithley Instrumerxs, Inc.
or your nearest Keithley representative.
b. When ordering parts, include the following
information.
1. Instrument Model Number.
2. Instrument Serial Number.
Part Description.
3.
Schematic Circuit Designation.
4.
Keithley Part Number.
5.
C. All parts listed are maintained in Keithley
Spare Parts Stock. Any pert not listed ten be made
available upon request.
Pert6 identified by the
Keithley Manufacturing Code Number 80164 should be
ordered directly from Kelthley Instruments, Inc.
0472
7
REPLACEABLE PARTS
MODEL 241 VOLTAGE SUPPLY
MODEL 241 REPLACEABLE PARTS LIST
CAPACLTORS
Circuit
Desig. Value
Cl01
Cl02
Cl03
Cl04
Cl05
Cl06
cm7
Cl08
Cl09
Cl10
Cl11
Cl12
Cl13
Cl14
C115A
C115B
Cl16
Cl17
Cl18
Cl19
Cl20
.00047 pf
.00047 pf
20 pf
.00047 IJ.f
.00047 pf
.00047 pf
.00047 pf
.00047 vf
.00047 Ilf
.00047 pf
2.0 vf
.00047 pf
.00047 pf
16 pf
20 pf
20 pf
.02 pf
.02
.07.
.1 )If
.Ol I*f
pf
pf
Rating
1000 v
1000 v
450 v
1000 "
1000 "
1000 "
1000 "
1000 "
1000 "
1000 v
3000 v
1000 "
1000 "
600 v
350 "
350 "
1000 v
1000 v
1000 "
200 "
1000 "
Type
CerD
CerD
EMC
CarD
CerD
CerD
Ce?ZD
CerD
CerD
CerD
MY
CerD
CerD
EMC
ETB
ETB
CerD
CerD
CerD
MY
CerD
Mfg.
Mfg.
Keithley
Code Part No. Part No.
71590 DD-471
71590 DD-471
56289 TVLl714
71590 DD-471
71590
DD-471
71590 DD-471
71590 DD-471
71590 DD-471
71590
71590
99120
DD-471
DD-471
LK30-205
71590 DD-471
71590 DD-471
14655 KR616C
12674 ME50415
12674 ME50415
72982
72982
72982
13050
72982
84125V203P
84125V203P
84125V203P
SMlA
81125V103P
C64-470P
C64-470P
C33-20M
C64-47OP
C64-470P
C64-470P
C64-470P
C64-470P
C64-470P
C64-470P
c53-2M
C64-470P
C64-470P
C34-16M
C52-20M
C52-20M
C22-.02M
c22-.02M
C22-.02M
C47-.lM
C2.!-.OlM
Cl21
Cl22
Cl23
Cl24
Cl25
Cl26
Cl27
Cl28
Cl29
Cl30
Cl31
Cl32
Cl50
*Nominal
8
1 Pf
1 I-rf
.l pf
1 Clf
.0068 pf
.033 pf
.02 pf
.OOl wf
1.0 pf
.47 pf
.47 pf
a.033 pf
.005 pf
value, factory set.
200 "
200 "
200 v
200 "
1000 "
1600 v
1000 "
1000 "
400 "
1000 "
1000 "
1600 v
6000 v
MY
MY
MY
MY
CerD
MY
CerD
CerD
MY
MY
MY
MY
MY
13050
13050
02777
13050
72982
14655
72982
72982
99515
99515
99515
14655
14655
107-21
107-21
P-12M
107-21
811Z5V682P
MGT-S33
841Z5V203P
8OlZ5V102P
E4-105
EP-32462
EP32462
MGT-S33
PKJ16OD5
C66-1M
C66-LM
C66-.lM
C66-1M
C22-.0068M
C43-.033M
C22-.02M
C22-.OOlM
C73-LM
C54-.47M
C54-.47M
c43-.033)1X
c130-.005PI
0472
MODEL 241 REPLACEABLE PARTS
DIODES
Circuit
Desig.
Dl
D2
D3
D4
Type
Silicon
Silicon
Silicon
Silicon
D5 Silicon
D6 Silicon
DJ
Silicon 02735
Mfr.
Code
02735
02735
02735
02735
02735
02735
D8 Silicon 02735
D9
DlO Silicon
Dll Silicon
Silicon 02735
02735
02735
D12 Zener 04713
D13 Silicon 04713
D14 Silicon 80164
D15 Silicon 80164
D16
D17 Silicon
D18 Silicon
D19
D20 Silicon
Silicon 80164
80164
02735
Silicon
02735
02735
Mfr.
Part No.
lN3252
lN3252
lN3252
lN3252
KeithlLj
Part No.
RF-17
RF-17
RF-17
RF-17
lN3252 RF-17
lN3252 RF-17
lN3252 RF-17
lN3252
RF-17
lN3252 RF-17
lN3252 RF-17
lN3252
1N938
lN1563A
lN3253
lN3253
lN3253
lN3253
lN3253
lN3253
lN3252
RF-17
14167
RF-19
RF-20 14168A Replace
RF-20 as a pair.
RF-20 14168A Replace
RF-20 as a pair.
RF-20
RF-20
RF-17
3
I
D21 Silicon 02735
D22 Silicon
98925
lN3256
4ElOO-8
RF-22
RF-27
MISCELLANEOUS PARTS
Circuit Mfr. Mfr.
Desig. Description
DSl Neon Lamp
DS2 Bulb
--DS3
--DS4
DS5
DS6
DS7
Light Assembly, READY
Bulb
Light Assembly, OVERLOAD
Neon Indicator Bulb
Not Used
Not Used
Neon Lamp
Code Part No. Part No.
08804 NE-2U PL-14
08804
47
72765 5100 PL-16G
08804 47 PL-4
72765 5100
03797
EGO1 WCBNE2V PL-12
08804 NE-2U
Keithley
PL-4
PL-16R
PL-14
0472
9
‘I
REPLACEABLE PARTS
MODEL 241
MISCELLANEOUS PARTS (Cont'd)
Circuit
Desig.
El01
El02
Fl (117 v) Fuse, Slow-Blow 2A
Fl (234 v) Fuse. Slow Blow. 3AG
---
F2
.Jl
52
---
---
---
---
--Pl Cord Set, 6 feet
RYl
RY2 Relay
RY3 Relay 80164 --- RL-10
RY4 Relay 80164 ---
Light Modulator A&.
Light Modulator Assy.
Fuse-Holder
Fuse, Slow Blow, l/32 amp
Receptacle, UHF, OUTPUT, + Mil. No. SO-239A 91737 6804 CS-64
Receptacle, UHF, OUTPUT, - Mil. No. SO-239A
Shorting Cap
Dust Cap
(F)Plug, Mate of Jl and 52, UHF, Mil No. 49190
(F)Reducing Adapter, UHF, Mil No. UG-175/v
Binding Post, G
Relay 80164 --- RL-11
Description
Mfr.
Code
80164 --80164 --75915 MDX FU-25
71400 313.750 FU-10
75915 342012
71400 MDL FU-11
91737 6804
91737 7907 CAP-5
95760 EC10
02660 83-822 cs-49
02660 83-185 CS-36
83330 136
93656 4638-13 co-5
80164 --- RL-10
Mfr.
Part No. Part No.
Keithley
1510
1510
FH-3
cs-64
CAP-l
BP-14
RL-9
Sl
-s2
s3
-s4
-s5 Rotary Switch less components, OUTPUT VOLTS Xl
-S6
--
(F) Furnished accessory
Rotary Switch, OUTPUT
Knob Assembly, Output Switch
Pushbutton Switch, RESET
Rotary Switch less components, OUTPUT VOLTS Xl00 80164 --- SW-85
Knob Assembly, Xl00 Volts Switch 80164 --Rotary Switch less components, OUTPUT VOLTS X10 80164 --- SW-85
Knob Assembly, X10 Volts Switch 80164 ---
Knob Assembly, Xl Volts Switch 80164 --Rotary Switch less components, OUTPUT VOLTS x.1 80164 ---
Knob Assembly, X.1 Volts Switch
80164 --- SW-86
80164 ---
82389 201s
80164 --- SW-81
80164 --- 13923A
KN-11
SW-90
13923A
13923A
13923A
SW-81
10
0472
MODEL 241 VOLTAGE SUPPLY
REPLACEABLE PARTS
MISCELLANEOUS PARTS (Cont'd)
Circuit
Desig.
57
--
-_
Tl
Circuit
Desig.
RlOl
R102
R103
R104
Rl05
R106
R107
Rl08
R109
RllO
Keithley
Part No.
SW-81
13923A
Description
Rotary Switch less components, OUTPUT VOLTS X.01
Knob Assembly, X.01 Volts Switch
Mfg.
Code
80164
80164
Knob Assembly, Trim Control 80164 KN-11
Transformer
80164 TR-34
RESISTORS
Keithley
R4A-1K
RB-8.2K
R4A-100
R42-3K
R42-4K
R4A-
JK
R4A-1K
R70-8.5K
RP19A-100K
R48-600
Value Rating
1 k?
a.2 kn
100 0
3 !a
4 k:?
7 k!?
1 kg
8.5 kn
100 kn
+600 il
l%, 5 w
lO%, 5 w
l%, 5 w
2%, 10 w
2%, 10 w
l%, 5 w
1%, 5 w
O.l%, l/2 I+!
5%, 2 w
l%, l/2 w
TYPO
ww
ww
ww
ww
ww
ww
ww
ww
War
ww
Mfg.
Code
Mfg.
Part No. Part No.
91637 RS-5
91637 cs-5
91637 RS-5
91637 RS-10
91637 RS-10
91637
RS-5
91637 RS-5
15909 1252
12697
43C2
01686 7020
Rlll
R112
R113
R114
R115
R116
R117
R118
Rl19
R120
R121
R122
R123
Rl24
R125
R126
R127
Rl28
R129
R130
2 kri
470 2
4.7 M?
470 n
510 kR
1m
22 kn
1 M-2
1 M?
22 kn
Not Used
1 wl
470 2
80 k?
40 !a
8.2 kQ
333 kn
333 kn
333 k?.
470 n
5%, 2 w
lO%, l/2 w
lO%, 2 w
lO%, lf2 w
l%, 5 "
lO%, l/2 "
lO%, l/2 "
lO%, l/2 w
lO%, l/2 w
lO%, l/2 w
lO%, l/2 w
lO%, l/2 w
l%, 10 w
l%, 10 w
lO%, 2 w
l%, 1 w
l%, 1 "
l%, 1 w
lO%, l/2 w
wwvar
12697 43C2
camp 01121
Comp 01121
Comp
ww
Comp
Comp
Comp
Comp
Comp
Comp
camp
ww
ww
Comp
DCb
DCb
DCb
Comp
01121 EB
91637
01121
01121 EB
01121 EB
01121 EB
01121 EB
01121 EB
01121 EB
91637 RS-10
91637 RS-10
01121
91637 DC-l
91637 DC-l
91637
01121
EB
HB
RS-5
EB
HB
DC-1
EB
RP19-2K
Rl-470
R3-4.7M
Rl-470
R41-10K
Rl-1M
Rl-22K
Rl-1M
Rl-1M
Rl-22K
Rl-1M
Rl-470
R34-80K
R34-40K
R3-8.2K
Rl3-333K
R13-333K
Rl3-333K
Rl-470
*Nominal value, factory set
0472
11
REPLACEABLE PARTS
MODEL 241 VOLTAGE SUPPLY
RESISTORS (Cont'd)
Circuit
Desig. Value
R131
R132
R133
RI34
R135
R136
R137
Rl38
R139
R140
R141
R142
Rl43
R144
R145
R146
R147
R148
R149
Rl50
*120 kn
330 kfl
4.7 kfl
330 kfl
470 n
4kn
470 n
470 n
100 kQ
47 krl
3MI-l
4.5 MI-l
1 Mn
lkrl
100 kQ
75 Ml
10 MI-2
100 kn
100 !a
100 kn
Rating
l%, l/2 "
lO%, l/2 w
lO%, l/2 w
lO%, l/2 w
lO%, l/2 w
l%, 5.w
10%; l/2 w
lO%, l/2 w
l%, l/2 w
l%, l/2 w
l%, l/2 w
l%, l/2 w
l%, l/2 w
l%, l/2 w
30%, l/4 w
l%, l/2 w
lO%, l/2 w
lO%, l/2 w
lO%, l/2 w
lO%, l/2 w
Mfg.
TYPO
Code
DCb 79727
Comp
Comp
01121
01121
Comp 01121
Comp
01121
ww 91637
Comp 01121
Mfg.
Part No. Part No.
CFE-15 R12-120K
EB
EB
EB
EB
RS-5 R4A-4K
EB Rl-470
Comp 01121 EB
Keithley
Rl-330K
Rl-4.7K
RI-330K
Rl-470
Rl-470
DCb 79727 CFE-15 Rl2-100K
DCb 79727 CFE-15 Rl2-47K
DCb
DCb 79727
DCb 79727
DCb 79727
CompV
DCb 79727
Comp 01121
Comp 01121
Comp 01121
Comp
79727
71450
01121
CFE-15 R12-3M~
CFE-15 R12-4.5M
CFE-15 R12-1M
CFE-15 Rl2-1K
45
RP12-100K
CFE-15 R12-75K
EB Rl-1OM
EB
EB
Rl-100K
Rl-100K
EB Rl-100X
R151
R152
RL53
R154
R155
R156
Rl57
R158
R159
Rl60
R161
R162
R163
R164
R165
R166
R167
R168
R169
R170
15 n
10 ksl
100 ksl
100 k-0
100 kn
100 krl
100 kQ
100 kfl
100 ko
100 kQ
100 k5-l
10, ksl
10 kn
10 ks2
10 hl
10 kn
10 kc
10 kn
10 kl
10 kfl
lO%, 2 w
2%, 10 w
.02%, 2 w
.02%, 2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
WWVar 12697
L"iw
ww
~ww
ww
ww
ww
ww
ww
ww
ww
ww
ww
ww
NW
ww
ww
ww
ww
.ww
91637 RS-10 R42-1OK
15909 1179 R4?-100K
15909
15909 1259 R47-100K
15909
15909
15909
15909
15909
15909
15909
15909
15909
15909
15909
15909
15909
15909
15909
43
RP32-15
1179 R49-100K
1259
1259
R47-100K
R47-100K
1259 R47-1OOK
1259 R47-1OOK
1259 R47-100K
1259
1259
1259
R47-100K
R47-10K
R47-10K
1259 R47-10K
1259 R47-10K
1259
1259
R47-1OK
R47-10K
1259 R47-10K
1259
R47-10K
1259 R47-10K
"Nominalvalue, factory set
12
0472
NODEL 241 VOLTAGE SUPPLY
REPLACEABLE PARTS
RESISTORS (Cont'd)
Circuit
Desig. Value
R171
2 1~::
R172 1 k".
R173
Rl74
R175
R176
R177
Rl78
R179
Rl80
Rl81
R182
R183
Rl84
Rl85
R186
R187
4 IQ
4 k7.
200 ::
100 n
400 3
400 n
20 3
10 ?
40 2
40 3
100 kc
470 ?
220 k!l
Not used
4. 7 :,iz
Rating
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.02%, l/2 w
.l%, l/2 w
.l%, l/2 w
5%, 1 'LJ
5%, 1 w
.l%, l/2 w
.l%, l/2 w
l%, l/2 w
:l%, l/2 w
lO%, l/2 w
lO%, l/2 w
lO%, l/2 w
10x., 2 w
Mfg.
TYPO
Code
WV 15909
ww 15909
ww 15909
ww 15909
ww 15909
ww 15909
ww 15909
ww 15909
ww 15909
VW 15909
ww 15909
ww 15909
Comp 01121
Comp 01121
Comp 01121
camp 0112.1
VACUUN TUBES
Mfg.
Keithley
Part No. Part No.
1259
R47-2K
1259 R47-1K
1259 R47-4K
1259 R47-4K
1252 R70-200
1252 K70-100
R626
R626
R69-400
R69-400
1252 R70-20
1252 R70-10
1252 R70-40
1252 R70-40
EB Rl-100K
EB Rl-470
EB
HB
Rl-220K
R3-4.7M
Circuit
Desig.
Number
Mfg.
Code
Keithley
Part No.
Vl 6627 86684 EV-6627
v2 6BG6
v3 6BG6
v4 6BG6
v5
6BG6
85599
85599 EV-6BG6
85599 EV-6~~6
85599 EV-6BG6
EV-6BG6
V6 6626 86684 W-6626
v7 6626 86684 W-6626
V8 6627 86684 EV-6627
v9 6627 86684 EV-6627
VlO 7025 73445 EV-7025
Vll 7025 73445 EV- 7025
0472
13
REPLACEABLE PARTS
(From Federal Supply Code For Manufacturers,
MODEL 241 VOLTAGE SUPPLY
Code-To-Name List
Cataloging Handbook H4-2)
1121 Allen-Bradley Corp.
Milwaukee, Wis.
1686 RCL Electronics, Inc.
Riverside, N. J.
2660 Amphenol-Borg Electronics Corp.
Broadview, Chicago, Illinois
2735 Radio Corp. of America
Commercial Receiving Tube and
Semiconductor Division
Somerville, N. J.
2777 Hopkins Engineering Co.
San Fernando, Calif.
3797 Eldema Corp.
Compton Calif.
4713 Motorola, Inc.
Semiconductor Products Division
Phoenix, Arizona
8804 Lamp Metals and Components
Department G. E. Co.
Cleveland, Ohio
72765 Drake Mfg. Co.
Chicago, 111.
72982 Gudeman Co.
Chicago, Ill.
73445 Amperex Electronic Co. Division of
North American Philips Co., Inc.
Hicksville, N. Y.
75915 Littelfuse, Inc.
Des Plaines, Ill.
79727 Continental-Wirt Electronics Corp.
Philadelphia, Pa.
80164 Keithley Instruments, Inc.
Cleveland, Ohio
82389 Switchcraft, Inc.
Chicago, Ill.
83330 Smith, Herman H., Inc.
Brooklyn, N. Y.
85599 Tube Department G. E. Co.
Schenectady, N. Y.
.2697 Clarostat Mfg. Co., Inc.
Dover, N. H.
.3050 Potter co.
Wesson, Miss.
.4655 Cornell-Dubilier Electric Corp.
Newark, N. J.
.5909 Daven Division Thomas A. Edison
Industries McGraw Edison Co.
Livingston, N. ~J.
i6289 Sprague Electric Co.
North Adams, Mass.
11400 Bussmann Mfg. Div. of
McGraw-Edison Co.
St. Louis, MO.
71590 Centralab Division of
Globe-Union, Inc.
Milwaukee, Wis.
86684 Radio Corp. of America
Electronic Components and Devices
Harrison, N. J.
91637 Dale Electronics, Inc.
Columbus, Nebr.
91737 Gremar Mfg. Co., Inc.
Wakefield, Mass.
93656 Electric Cord Co.
Caldwell, N. J.
95760 Protective Closures Co., Inc.
Buffalo, N. Y.
98925 Semiconductor Division of
Clevite Corp.
Waltham, Mass.
99120 Plastic Capacitors, Inc.
Chicago, Ill.
99515 Marshall Industries
Electron Products Division
Pasadena, Calif.
14
i/~ /.,
0472
--.. r’l I
*
u3-----pQ
‘b
wwking wolti~gss.
GND
: 'WI #'I
,PRt ,#2
.SEC #I
SEC #la
: SEC #2'
',: SEC #2a
y;: SEC #13,.
:,< SEC ,#4
.SEC #5
SEC #6
SEC #7
,. ,.,
/,
\
I’il
USED ON
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