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INSTRUCTION MANUAL
Model 244
High Voltage Supply
(and Model 2441 Overload Protection Option)
@COPYRIGHT 1976, KEITHLEY INSTRUMENTS, INC.
FOURTH PRINTING, DEC. 1977, CLEVELAND, OHIO, U.S.A.
MODEL 244 CONTENTS
CONTENTS
SWtiO" Page
SPECIFIC.4TIONS .................................... iv
1. GENERAL DESCRIPTION. ............................... 1
2. OPERATION. .................................... 4
3. CIRCUIT DESCRIPTION. ............................... 6
4. ACCESSORIES.................................... 8
5. REPLACEABLE PARTS. ................................ 13
6. CALIBRATION .................................... 19
SCHEMATICS ...................................... 25
ILLUSTRATIONS
Figure NO. Title Page
1 Model 244 High Volt+ Supply ...................... 1
2 FrOnL Panel Controls. .......................... 3
3 Rear Panel Controls ........................... 3
4 current Limiting. ............................ 5
5 Simplified Circuit Diagram. ....................... 6
6 Overload Protection Cmmectio,, Diagram. ................. 10
7 Overload Protection Circuit Diagram ................... 11
8 Top Cover Assembly. ........................... 15
9 Bottom cover Assembly .......................... 15
10 Circuit for Laad BDX LB-1 ........................ 22
11 Circuit for Divider ""-1. ........................ 22
1176
SI?ECIFICATIONS MODEL 244 HIGH VOLTAGE SUPPLY
SPECIFICATIONS
OUTPUT:
Voltage: -200 to -2200 volts in ZO-volt steps
current: 10 milliamperes maximum
Polarity: Negative with respect Lo chassis
ACCWACY: il% of dial setting
RESOLUTION: A O-25 volt "Trim" porentiameter permits interpolation be-
tween steps with a resolution of better than 100 millivalts.
STABILITY: ~0.005% per hour after a two-hour warm-up; +o.Ol% the first
hour or in subsequent S-hour periods after a one-hour warm-up.
LINE KECULATION: +O.OOl% for a 10% change in line voltage.
LOh" REGULATION: ,O.OOl% for a 5-milliampere load change.
RIPPLE AN" NOISE: Less than 0.5 milli"olt rms above 5 Hz.
OVERLOAD: Electronic current limiting with automatic recovery.
METER: Provides check on OUtpUt voltage.
CONNECTOKS: Output (on rear) MHV series (UC-931/U)
POWER
: 105-125 or 210.250 volts (switch-selected); 50-60 Hz; 90 watts.
OIMENSlONS: b-114" high x S-718" wide x l&7/8" deep (158 x 225 x 378 mm)
WEIGHT: net weight, 13 pounds (6,O kg).
ACCESSORIES FURNISMED: Mating Connector (MHV series, UC-932A/U)
iv 1176
MODEL 244 HIGH VOLTAGE SUPPLY GENERAL DESCRIPTlON
SECTION I. GENERAL DESCRIPTION
l-l. GENERAL. The Model 244 is a negative-polarity resistors, and selected zener diode provide voltage
high-voltage supply that provides accurate, stable stability of +0.005% for B-hour periods after one-
outpote from -200 to -2200 volts d-c at up to 10 ,,$. hour warm-up.
"l~Xi"l"Ul.
d. Model 2441 Overload Protection Option.- A,,
optional protection circuit is available (on special
1-2. FEATURES. order) which can be used to limit the current of the
Model 244 when monitored by e Keithley picoammeter
a. In-line Calibrated Dials.- Two dials set the such es the Model 414A.
output voltage in 200 and ZO-volt steps. Trim Control
permits interpolation between ZO-volt setting, with
100 millivolt resolution. 1-3. APPLICATIONS.
b. Overload Protection.- Repeated or continuous a. The Model 244 has bee,, designed primarily for
overloads will not damage the instr,m,ent. Protection negative-polarity high voltage biasing for photo-
circuit limits the oucput current to less than 13 multiplier applications.
milliamperes with automatic recovery when overload is
removed. b. The stability, regulation and low noise also
make it suitable for use with photocells, ion chambers
c. Stability.- Solid-state design, stable range and resietiviey measurements.
0870 1
GENERAL DESCRIPTION MODEL 244 HIGH VOLTAGE SUPPLY
TABLE 1-l.
Front Panel Controls.
COntrOl Functional Description Paragraph
OWERSwitch (S102) Controls the a-c line power to all circuits. 2-2e
OWERON indicator (mlol) Pilot light glows orange when Power Switch is ON. z-2f
UTPUT Switch (5101) Controls the a-c power to the high voltage section. 2-2g
oltwe Dials (s103, s104) sets oueput voltage from -200 to -2ml volts. 2-b
rim Control (R146) Permits interpolation between steps with O-25 volts maximum trim. 2-a
VBRLOAD Indicator Pilot light glows when output current exceeds 11 I&. approximately. 2-3~
,eter (MlOl) Indicates the magnitude of selected voltage. 2-3a
TABLE 1-2.
Rear Panel Connections.
Control Functional Description Paragraph
OUTPUT Receptacle (5101) VOl tage o"tp"t 2-la
117V/234V Switch (5103) Sets instrument far either 117 or 234 " a-c power. Z-lb
Fuse (FlOl) 117" operation: 3/4A, slow-blow. 2-k
234 Operatim: 3/&I, slow-blow.
Overload Input (Cover) Cover plate for optional Model 2441 installation. 2-k
2 0770
0"tpllt
Selector
Switch
(SlO3)
output
Selector
switch
(X04)
(MlOl) Switch indicator Indicator Switch
(SlOl) (DS102) (OSlOl) (5102)
FIGURE 2. Front Panel Controls.
117/234V F"LTC5 (COWS) OUTPUT
Switch (FlOl) Overload Receptacle
(5103) Input (J")l)
z.rnrmm I) "_^_ n--.7 "~~~-.-_,~
0770 3
OPERATION MODEL 244 HIGH VOLTAGE SUPPLY
SECTION 2. OPERATION
2-1. CONNECTIONS. 2-3. OPERATING CHECK-OUT.
a. Output Receptacle.- A rear panel mounted MHV a. Meter Indication.- When the OUTPUT Switch is ON
teflon-insulated receptacle provides connection to the meter should indicate the dialed voltage.
the load circuit. The outer shell of the receptacle
is connected to chassis.
b. Output Voltage.- Connect an accurate voltmeter
b. Coaxial Cables.- Use coaxial cables which are such as Keithley Model 153 to the output to verify
rated for greater than 2200 volts for safe operation. the power supply voltage accuracy. The Trim Control
Coaxial cables provide best noise immunity for criti- should be set to CAL position. measure the Model 244
cal meaeurements. output for dial settings of 200,,,500, and 1000 volts.
Accuracy should be 21% of dial setting.
C. Earth Ground.- For maximum operator safety use
the 3-wire power cord with third wire solidly connec-
ted to earth ground. c. Current Limit.- (Refer also to paragraph 2-5
for a more complete discussion of the overload current
2-2. PRELIMINARY PROCEDURES. operation.)
a. The instrument is shipped in operating condition 1. Connect an accurate ammeter such as a Keith-
+ith all components installed for immediate use. ley Model 153 in series with an adjustable resis-
tance decade box. Set the dialed voltage on the
b. Set the 117-234 volt switch for operating line Model 244 at -200 volts with the OUTPUT Switch
voltage. "OFF". Apply the -200 volt output to the resistance
decade box set at 20 kilahms. The ammeter should
C. Check the fuse for proper type and rating. indicate 10 mA when the OUTPUT Switch is placed
nON" . The OVERLOAD Indicator should not be lighted.
d. Provide adequate ventilation for the instrument. Decrease the resistance load until the OVERLOAD In-
Air flow should be maintained along the top and bottom dicator is lighted. The annneter should indicate
surfaces. between 11 mA and 12 n!A.
NOTE NOTE
If air flow is constricted the internal Resistor load power dissipation is approx-
temperature will rise above normal design imately 2.2 Watts.
limits causing degradation of critical
components. 2. Connect an ammeter and 50 kilohm resistive
load to the output of the Model 244. Set the dial-
e. Set the front panel controls as follows: ed voltage an the Model 244 at -200 volts with the
OUTPUT Switch "OFF". Place the OUTPUT Switch to
POWERSwitch Off "ON" position. Reduce the load to zero ohms (short
Voltage Dials 2-o-o circuit) and measure the output current. The
OUTPUT Switch Off ammeter should indicate less than 14 milliamperes
with the Model 244 OVERLOAD Indicator lighted.
f. Connect the line cord and set the POWER
Switch to ON. (The POWERindicator should 2-4. SETTING OUTPUT VOLTAGE. The setting of the
be lighted.) Voltage Dials and Trim Control determines the magni-
tude of the output.
NOTE
a. The two Voltage Diala set the output from -200
The meter should indicate 0 KILOVOLTS. to -2200 volts d-c in calibrated 200 and 20-volt
steps. With the Trim Control in CAL position the
output is set by the Voltage Dials within specified
g. After a preliminary one minute warmup period, kXC"K%Y.
p&ace the OUTPUT Switch to ON position. Allow another
warmup period (30 minutes) for the high voltage sec- b. The Trim Control interpolates between 20-volt
tion to stabilize. The meter should indicate approx- settings with 100 millivolt resolution. The Trim
imately one minor division or 200 volts. Control range is 0 to 25 volts.
4 0770
MODEL 244 HIGH VOLTAGE SUPPLY OPERATION
2-5. OVERLOAD PROTECTION. c. Model 2441 Overload Protection Option.- An
optional protection circuit is available which can
a. The Model 244 has an overload current limiting bz used to limit the current of the Model 244 when
circuit which limits the output short-circuit current w>nitored by a Keithley picoammeter such as the
to a maximum 14 milliamperes. The circuit is adjusted I!zrdel 414A. Consult your Keithley representative or
so that the OVEKLOAD Indicator will be lighted when t:,e Sales Service Department for further information
the output current exceeds 11 milliamperes. When the regarding the Model 2441 Option.
overload is removed the Model 244 will automatically
reset to normal operation and the OVERLOAD Indicator
will turn off.
2-6. CAPACITIVE La4ix.
b. Current Limiting Characteristic.- The Model 244
current limiting is shown graphically by the typical a. When a capacitive load is connected to the out-
V-I characteristic curves in Figure 4. The OVERLOAD put, Model 244 will deliver a charging current up to
Indicator is factory-adjusted to turn on at approxi- 14 milliamperes maximum until the dialed voltage is
mately 11 milliamperes. However the output voltage developed across the load. During the charging time
remains constant for current exceeding 11 milliamperes the OVERLOAD Indicator will be lighted as long as the
as shown. The current limiting occurs typically from output current exceeds 11 milliamperes. The OVERLOAD
11.3 to 12.2 milliamperes depending on the dialed Indicator will turn off automatically when the charg-
voltage. ing current is reduced to less than 11 milliamperes.
b. Before reducing the dialed voltage with large
capacitive loads (exceeding 1 joule of energy), set
the OUTPUT Switch to "OFF". Readjust the dialed
voltage and set the OUTPUT Switch to "ON".
NOTE
A resonant condition (with increased output
noise) could result for large capacitive
loads. If this should occur, change the
load capacitance slightly to remove the
resonant condition and reduce the output
noise.
2-7. OUTPUT NOISE. The Model 244 output ripple and
noise is less than 0.5 millivolt rms above 5Hz with
maximum load. The output noise is typically 200 WV
rms ~with no load. Transient power line noise will
tend to increase the output noise.
2-8. SHORT-TERM STABILITY. The Model 244 stability
is specified to be + 0.005% per hour worst-case after
a two-hour warm-up. After warm-up, the short-term
0 I stability is typically 0.003% per hour for constant
10 12 14 mA line voltage, load, and ambient temperature.
f .
2-9. TEMPFJATURE COEFFICIENT. The temperature co-
efficient is typically 30 PPM1 C (with a maximum
FIGURE 4. Current Limiting. temperature coefficient not to exceed 60 ppml C).
1176 5
CIRCUIT DESCRIPTION MODEI: 244 HIGH VOLTAGE SUPPLY
SECTION 3. CIRCUIT DESCRIPTION
3-1. GENERAL. selected by the front panel dials which control the
voltage divider. The error amplifier senses any
a. The Model 244 High Voltage Supply haa been difference between the voltage across the divider
designed to provide a,, accurate voltage from -200 string (which is connected to the output) and the
to -2200 volts d-c. A simplified circuit diagram is fixed reference supply. The amplified difference
shown in Figure 5. drives the series regulator circuit to correct the
output voltage. The overload circuit senses the out-
b. The Model 244 is composed of high and low volt- put load current and controls the current within
age supply sections and various other circuits for design limits. This circuit also provides an over-
control and overload protection. These circuits in- load indication.
clude the following.
1. High voltage supply. 3-2. HIGH VOLTAGE SECTION. The high voltage is de-
2. LOW voltage supply. veloped by a voltage doubler circuit composed of
3. Series high voltage regulator. diodes 0101, DlC2, DlC3, and 0104 and fileer capaci-
4. Error amplifier. tars Cl13 and C114. The filtered d-c voltage (approx-
5. Reference supply. Fmaeely 3200 volts) is applied between the - OUTPUT
6. Overload circuit. and the anode of the series pass element (tube VlOl).
7. Voltage Divider. The high voltage section is controlled by the OUTPUT
Switch SlOl which provides ON/OFF control of the a-c
C. Over-all Operation. The output voltage is power to transformer TlOl.
R
H
WWER LDAD
LAMP UMP
I
FIGURE 5. Simplified Circuit Diagram.
6 0770
MODEL 244 HIGH VOLTAGE SUPPLY CIRCUIT DESCRIPTION
3-3. SERIES HIGH VOLTAGE REGULATOR. The series regu- b. Overload Indication.- The OVERLOAD Indicator
lator tube VlOl is biased by the collector voltage of 05102 is driven by transistors 4104, Q106, and Q107.
transitor QlOE to form a "cascade amplifier" with the Transistor QlO5 is an emitter-follower which biases
output load serving as the plate resistor. The Model 9106 to insure that the OVERLOAD Indicator turns on
244 - OUTPUT is effectively the algebraic sum of the before the current limiting actually occurs. (The
unregulated high voltage (3200 V) and the drop across OVERLOAD Indicator is designed to turn on at approx-
"101 and QlOE. When the OUTPUT Switch SlOl is off imately 11 milliamperes load current.)
(e.g. no plate voltage is on "101) the voltage at pin
8 (Screen Voltage) of VlOl will be significantly less
than nominal + 95 volts since the tube current will 3-6. LOW VOLTAGE SECTION. The low voltage for the
cause a voltage drop across R169. control circuitry is obtained from a full-wave rec-
tifier composed of diodes D109 and I1110 and filter
capacitor c115.
3-4. VOLTAGE CONTROL. The output voltage is divided
by a resistor divider composed of resistors R146 a. + 95 v d-c. This voltage is applied to a bias
through R167 located an switches S102, 5103, and S104. screen on "101. The + 95 v is developed across R113
The sampling voltage is compared with the reference and D105.
supply voltage. (The reference supply is composed of
zener D119 and resistors Rl40 through R145). The b. + 20 v d-c. This voleage is regulaeed by zener
difference voltage is amplified by the error amplifier diode D105. A regulated current sowce (25~) supplies
(transistors QllO, Qlll, Q112, and Q113) which drives a constant current far zener diodes D105 and D106.
cathode biasing transistor ~108. Diodes 0114 through The current source is composed of transistors QlOl,
Dl17 and resistors R115, R117, R139, and R144 protec? 9102, and Q103 and reference zener D107. The regulated
the comparator and zener reference from switching current is sampled at R116 and compared to zener 0107
transients when the output is changed. Diode Dill by transistor Q102. The action of QlOl and Q102
prevents a reverse bias on transistor QlOV beyond its regulates the currene through 0105, D106, and R113.
breakdown voltage.
c. - 10 v d-c. This voltage is regulated by zener
diode 0106.
3-5. CURRENT CONTROL,
a. The output current is sensed by measuring the NOTE
voleage drop across resistor R124. A current limit
amplifier consisting of Q107 controls the error am-
plifier through diode D112. When the current through The a-c power to the high and low voltage
R124 exceeds approximately 11 milliamperes, transistor sections is controlled by the POWERON
Q107 forward biases D112 and turns off the error am- Switch ~102. The POWERON Indicator
plifier which reduces the Model 244 through the action ix101 is driven by the low voltage d-c
of VlOl. SUPPlY.
0770 7
ACCESSORIES MODEL 244 HIGH VOLTAGE SUPPLY
SECTION 4. ACCESSORIES
4-l. GENERAL. The following Keithley accessories can 4-2. OPERATING INSTRUCTIONS. A separate Instruction
be used with the Model 244 to provide additional co"- Manual is supplied with each accessory giving complete
venience and versatility. operating information.
Model 4003A Rack Mounting Kit
Description: Parts Liar:
The Model 4003A is a rack mounting kit with overall Item Qty. ,Per Keithley
dimensions, 5-l/4 inches hFgh x 19 inches wide. Two NO. Assemblv Part No.
cop covers are provided for use with either 10 inch or
13 inch deep instruments. 1 Top cover, 10" 1 18554B
2 Panel Adapter Plate 1 17452B
3 Angle Support 1 17476A
Application: 4 Screw, ii10 x 318" 4 ---
5 Connecting Place 1 191268
The Model 4003A converts the instrument from bench 6 Screw, #lo x 112" 4 -_-
mounting to rack mounting. It is suitable for mount- 7 Angle 1 14624B
ing one instrument Fn one-half of a standard lY-inch 8 Top Cover, 13" 1 20015B
rack.
MODEL 244 HIGH VOLTAGE SUPPLY ACCESSORIES
Model 4004A Dual Rack Mounting Kit
Description: parts List:
The Model 4004A is a rack mounting kit with overall Item Qty. Per Keithley
dimensions, 5-l/4 inches high x 19 inches wide. Two NO. Description Assembly Part No.
top covet-~ are provided for use with either 10 inch
or 13 inch deep instruments. 1 Top cover, 10" 185540
4 screw, #lO x l/2
5 Connecting Plate 19126A
Application: 6 screw, (110 x l/2 ___
7 Angle 14624B
The Model 4004A converts the instrument from bench 8 Top Cover, 13" 20015B
mounting to rack mounting. It is suitable for mount- 9 Zee Bracket 1914411
ing two inseruments in a standard 19-inch rack. 10 Plate (not shown) 174548
ACCESSORIES MODEL 244 HIGH VOLTAGE SUPPLY
Model 2441 Overload Protection Option
Description: Typical Operation:
NOTE
The Model 2441 when factory installed on the Model
244 provides automatic current limiting of the Model The picaammeter (such as Model 414A) has a 1
244 output. volt output for full scale input on the range
selected. If the current monitored by the
Specifications: Model 414A increases to approximately 170% of
full scale the Model 414A output,of the 1.7
OVERLOAD: Model 2441 circuitry provides automatic volts will activate the Model 2441 circuit.
current limiting of the Model 244 when the over- Any further increase in the current monitored
load input voltage to the Model 2441 exceeds by the picoammeter will ultimately be limited
approximately +1.4 volts. to no more than 200% of the full scale range
SENSITI"IT:T: An overload input voltage from +1.4V of the picoammeter. However current limiting
to +2.OV (+1.7 volts typically) will cause cur- of the Model 244 will occur whenever the Model
rent limiting of the Model 244 output. 244 output exceeds 11 milliamperes s the Model
OVERLOAD INDICATIONS: The overload lamn will indi- 2441 is activated.
cate whenever rhe Model 244 is in a current a. Connect the recorder output of a Keithley
limiting mode. picoammeter such as the Model 414A or equivalent to
NOTE the Overload Protection Input receptacle 5201. see
Figure 1.
The Model 244 will deliver a calibrated
voltage as long as the overload lamp is off b. Select the full scale current range an the
(or the overload input voltage does not picoammeter for desired operating range.
exceed +1.2 volts). c. Recorder output of 414A should be in 1 volt
NOISE IMMUNITY: An 8V p-p at 60 Hz overload input mode.
signal will not operate overload. d. Operate the Model 244 as described in gecrion
RESPONSE TIME: Time for a 2.5" Peak pulse to acti- 2.
"ate 2441 is typically 0.25 seconds (lo-go%).
I MODEL 244-2441
r-l PICOAMMETER
IT System
Ground
FIGURE 6. Overload Protection Connection Diagram.
10 0976
MODEL 244 HIGH VOLTAGE SUPPLY ACCESSORIES
Theory of operation far Model 2441: (See Schematic Replaceable Parts for Model 2441:
24640A.)
C*l-C"it Mfr. Mfr. Keithley
a. The Model 2441 Option provides current limiting
oesig. oescription Code oesig. Part NO.
control when used with a ,,icoammeter with a 1 volt
output. The Overload Protection Input 5201 requires 5201 COll"eCtOr APH so-PC2M a-233
an input signal between 1.4 to 2.0 volts d-c. The -- Cable, 3 ft., k&es
Model 2441 circuit activates the Model 244 control with 5201) K-I -- 3991
circuit by meant of transistor switch Q202. The Q201 Transistor F-I 2N3565 'i-G-39
Model 2441 filter circuit prevents false overloads Q202 Transistor F-l 2N3565 'K-39
due to 60 Hz noise while not affecting the response R201 Resistor,lMn,l0%,1/2W A-B EB Rl-1M
which is approximately 0.25 seconds (10-W% rise R202 Resistar.3.9Kn.l0%.1/2W A-B EB Rl-3.9K
the). R203 ~~~~~~~~~ m,io%,i/2w ~-8 EB n-x
R204 Resistor, 10Kn,10%,1/2W n-B EB Rl-1OK
b. 'rhe 2441 Circuit is composed of an emitter R205 Resistor,100K~,10%,1/2W h-B EB Rl-100K
fallower transistor Q201 which drives a transistor c201 Capacitor, 22ufd,20" u-c K22JZOK CSO-2x4
switch Q202 which is paralleled wieh the Model 244 -_ Stand off K-I -- ST-25
overload transistor switch 4107. A filter circuit 5107 COll"eCt'X K-I -- SpCXid
is composed of R203 and C2Ol.
FlClmE 7. Overload Protection circuit Diagram.
0976
ACCESSORIES MODEL 244 HXH VOLTAGE SUPPLY
MH" connector, cs-191
D~SCt-ipfiOll: Application:
TL- mv ~..-..~~~nr o..nnli~A ...lrh the instrument is a The connector should be used with low noise coaxial
------TOT. This part cables such as RG58A/U or RG59/U. The cable size
Il. used with this connector should not exceed .257in. 0.1)
Assembly Instructions:
4. Solder contact to center conductor.
5. Slide back end p.rts forward then
thread assembly into connector and
lock securely. "ee qmket must be
split by brald clamp.
3. Fold brald back over brald clnp and
trim .I ,kwn. Cut dlelectrlc and center
conductor to 7/W' dimension then
strip dlelsctrlc to .470 dimension.
12 0870
MODEL 244 HIGH VOLTAGE SUPPLY REPLACEABLE PARTS
SECTION 5. REPLACEABLE PARTS
5-l. REPLACEABLE PARTS LIST: This section contains t"rer's Part Number, and ehe Keithley Part Number.
a list of camponen~s used in this instrument for user Also included is a Figure Reference Number where
reference. The Replaceable Parts List describes the applicable. The complete name and address af each
individual parts giving Circuit Designation, Descrip- Manufacturer is listed in the CODE-TO-NAME Listing
tion, Suggested Manufacturer (Code Number), Manufac- following the parts list.
TABLE 5-l.
Abbreviations and Symbols
A i ampere F i farad n ; ohm
Fig : Fig"?-+
Cb"ar : Carbon Variable P i pica (10-'2)
cem : ceramic oisc GCb i Glass enclosed Carbon PC : Printed Circuit
Cer Trimmer ; Ceramic Trimmer POly ; Polystyrene
Chip : composition k kilo (10-3)
: Deposit Ref. : Reference
DCb : Deposited Carbon P micro (10.6)
Desig. : Designation TC" i Tinner Copperweld
M ~~~ (106)
EAL i Electrolytic, Aluminum Mfr. i Manufacturer " : valt
ETB : Electrolytic, tubular MtF : Metal Film
ETT i Electrolytic, tantalum MY Mylar W : watt
ww i Wirewound
NO. Number ww"ar : Wirewound Variable
5-2. ELECTRICAL SCHEMATICS AND DlAGRANS. Schemaeics Sales Service Department, Keithley lii~truments, Inc.
and diagrams are included to describe the electrical or your nearest Keirhley representative.
circuits as discussed in Section 3. Refer to Table
5-2 which identifies all schematic part numbers b. When ordering parts, include the following in-
included. formation.
1. Instrument Model Number.
5-3. HOW TO "SE THE REPLACEABLE PARTS LIST. This 2. Inserument Serial Number.
Parts Lise is arranged such that the individual types 3. Pare Description.
Of components are listed in alphabetical order. The 4.. Schematic Circuit Designation
parts for the instrument's Main Chassis are listed 5. Keithley Part Number.
followed by printed circuit boards and other sub-
assemblies. c. All pares listed are maintained in Keithley
spare Parts Stock. Any part not listed can be made
available upan request. Parts identified by the
5-4. HOW TO ORDER PARTS, Keithley Manufacturing Cade Number 80164 should be
ordered directly fram Keithley Instruments, Inc.
a. Replaceable parts may be ordered through the
TABLE 5-2.
Circuit Designaeion Schematic Part Number
Power supply PC-270 243173
0870 13
REPLACEABLE PARTS MODEL 244 HIGH VOLTAGE SUPPLY
TABLE 5-3.
Mechanical Parts List
Qll.%ltity Keithley Fig.
Description Per Assembly Part NO.
1) Chassis 1 24304C 7
11) Fro,e Panel 1 24306C 637
Top Cover Assembly ___ 19057 6
12) Cover, Sheet Metal 1 19055c
13) screws 4
Handle Assembly ___ 6
14) Handle 1 W-18
15) Screws #6-32x3/8" R. H. Slotted 2
Bottom Cover Assembly __- ___ 7
2) cover 1 190628
3) Fastener 2 FA-54
Feet Assembly -_- ___ 7,
4) Feet 4 FE-5
5) Ball 4 FE-6
6) screws #8-32x3/8" Phillips, Pan Head 4 ___
Tile Bail Assembly ___ 7
7) Bail 1 171470
8) Right Assembly 1 19206B
9) Left Assembly 1 192058
10) Screws 1/6-32x1/4" Phillips, Pan Head 2 -__
14 1176
MODEL 244 HIGH VOLTAGE SUPPLY REPLACEABLE PARTS
I
FIGURE 8. To,, Cover Assembly.
-
15
1176
REPLACEABLE
PARTS MODEL 244 HIGH VOLTAGE SUPPLY
0.1 IIF 15" 890159 c93-.lM
0.1 !JF 15" 890159 c93-.lM
0.1 VF 15" 890159 c93-.l.M
0.1 !lF 15" 890159 C93-.lM
.02 UP 600" SW.02 C22-.02M
0.1 UP 250" CZJOAE Cl,&.lM
0.1 UF 250" C28OAE C17G.l"
22 PP 600" ED-47 c22-22P
33 PF 600" ED-33 cx-3%
.02 PF 600" ED-.02 C22-.02M
100 PP 600" ED-100 CL*-1OOP
0.1 !lF 4OOOV LQ40104X c192-.lM
1.0 UP 2000" LQ20105X c191-lM
1.0 UP 2000" LQ20105X C191-lM
40 !lF 350" TVA1611 C23-40M
Cl16 0.1 PP 4ooov LQ40104X c192-.lM
Cl17 0.1 "F 250" CiSOAE C178-.1M
BRG 20052 lx-237 3
Bps. 47439 E-236 10
BRG 47439 CS-236 10
5104 connector, ~lnl-P" (Solde BRG 47439 CS-236 10
5105 connector, Mini-P" (Solde BRG 47439 cs-236 10
5106 connector, mini-P" (S&de BRG 47439 cs-236 10
5107 K-I 246588 10
5108 Receptacle, female APH UG93l/V cs-190 io
___ Connecfor, male (mate far J108) Am "G-932AIU cs-191 10
Mfr. Mfr. Keichley Fi.g .
Code Part NO. Pare NO. Ref.
S-T 3CFS25 RF-49 10
S-T 3CFS25 RF-49 10
S-T 3CFS25 RF-49 IO
S-T 3CFS25 RF-49 10
ITT Z"20 m-25 10
DIG 1N302OA m-39 10
DIG lN713 m-14 10
T-I 18645 w-14 10
MOT lN4006 RF-38 10
MOT IN4006 RF-38
T-I lA645 RF-14
T-I IN645 RF-14
T-I lN914 RF-28 >
T-I lN645 RF-14
T-1 lN645 w-14
T-I IN645 RF-14
MOT IN4006 RF-38
MOT UT4006 RF-38
MOT IN938 Z-6
S-T vR47 25725A
MODEL 244 HIGH VOLTAGE SUPPLY REPLACEABLE PARTS
MISCELLANEOUS
circuit Mfr. Mfr. Keithley Fig!.
rlesig. Type Code Part No. Pare NO. Ref.
"SlOl Pilot Lamp, Neon, White Lens 1-D 2100 PL-49 2
05102 Pilot Lamp, Neon, Red Lens 1-D 2100 PL-50 2
DS1,03 Pilot Lamp, Neon G-E NE-83 PL-41 10
PlOl Fuse, Slow-Blow, 0.75 A, 250V BUS MDL F"-19 3
Ml01 Meter K-I ___ m-87 2
TlOl Transformer K-I __. TR-134 10
T102 Transformer K-I TR-131 10
"101 Vacuum Tube K-I ___ W-8068 10
RESISTORS
circuit Mfr. Mfr. Keithley Fig.
rasig. Value Rating TYPe Code Part NO. Part No. Ref.
RlOl 100 n lO%, l/4 w OHM RC07 K76-100 10
R102 IK 0 IO%, l/4 w OHM RC07 R76-1K 10
RI03 4.7M n lO%, 1/2 w A-B EB RI-4.7M 10
R104 4.7M n lo%, l/2 w A-B B8 Rl-4.7M 10
RI05 4.7M n lO%, l/2 w A-B EB Rl-4.7M 10
R106 4.7M n lO%, l/2 w A-B EB RI-4.7M 10
R107 4.7M n lo%, l/2 w A-B EB Rl-4.7M 10
R108 4.m 0 lO%, l/2 w A-B ED RI-4.7M 10
R109 600K n l%, l/2 w DLE DCF-l/2 R12-600K LO
RllO 600K n l%, l/2 w DLE DCF-l/2 RlZ-600K 10
Rlll 600K R 1%. l/2 w DLE DCF-l/2 K12-600K 10
R112 600K 0 l%, l/2 w DLE cm-l/2 RlZ-600K 10
8113 2.5K 0 5%, 10 w OHM D57F R5-2.5K 10
R114 2K n 1%, l/2 w IRC CEC R94-2K 1.0
R115 1K n l%, l/8 W IRC CEA R88-1K 10
R116 402 5, 1%. l/2 w IRC CEC R94-402 10
R117 1K n l%, l/8 w IRC CEA R88-1K 10
RI18 33K n lO%, l/2 w A-B ES Rl-33K 10
RI19 220K n lo%, l/2 w A-B ED RI-220K 10
RI20 4.02KR l%, l/2 w IRC CEC R94-4.02K 10
RI21 47K n lO%, l/2 w A-B EB Rl-47K 10
R122 4x n 10%. 112 w A-B EB RI-47K 10
R123 47K n lO%, l/2 w A-B EB Rl-47K 10
R124 *Selected R l%, l/2 w IRC CEC R94" 10
R125 4.7K n IO%, l/2 w A-P, EB Rl-4.7K 10
R126 4.7K n lO%, l/2 w A-B E" Rl-4.7K 10
F.127 14 R l%, l/2 w IRC CRC R94-14K 10
R128 15K n lO%, l/2 w A-B EB Rl-15K 10
R129 30.lKn I%, l/2 w IRC CEC K94-30.x 10
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