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INSTRUCTION MANUAL
Model IV0
Digital Multimeter
@COPYRIGHT 1975, KEITHLEY INSTRUMENTS, INC.
FOURTH PRINTING, DECEMBER 1977, CLEVELAND, OHIO, U.S.A.
CONTENTS
ILLUSTRATIONS
-
1075
SPECIFICATIONS MODEL 190
SPECIFICATIONS
AS A DC VOLTMETER AS AN OHMMETER
RANGE: -`lo m~crovolts per d,git (1 volt full range) lo RANGE: 10 milliohms per digit (1 lcllohm full range) 1"
IlOO volts full range in four decade ranges. 100% 10 megohms full range in 11% decade ranges 1,OO"o
""erranglng to 199999 on ai1 ranges except on the overranging lo 199999 on ail ranges~
1000.""II range, ACCURACY (90 days): ?tO 02% of readlng + 0 O,"a
ACCURACY' (24 hours): 5(0.005% of reading + Of ranqe + O,2 ohm, exceDt _tio~08"o 0, lead,"" f
0,005"0 01 range). (90 days); +(0.015% of reading O.OlYo-"I range) on the lO:meg;hm range -
i 0,00500 "I range,, * k?ss than 0~00001% Of TEMPERATURE COEFFICIENT: ?10~002"~ "1 read,""
reading per ""I, from full range 1, 0,001% "1 range,/ c except i(0 01"" "`i
TEMPERATURE COEFFICIENT: iO,OOZ% "1 "1 readlng'+ 0.001"~ "1 range) `"c "n the
readinglc 10.megohm range,
INPUT RESISTANCE: Greater than 1000 megohms on SETTLING TIME: Less than 3 seconds plus 1 second
the l-V",, range, 10 megohms on the 10 to 1000.""If ppr megohm lo wIthin OOlOb of final readlng~
ranges, CONFIGURATION: Two-termina,. constant currents HI
SETTLING TIME': Less than 5 seconds to wfh,n
0 01% Of fInal reading. VOLTAGE ACROSS UNKNOWN: 5 volts for fu,, ranqe~
NORMAL MODE REJECTION RATIO: Greater than 60 MAXIMUM ALLOWASLE INPUT: 20 v"Its "n the-1~
dB ""er one d,g,l on the 1 and IO-"",! ranges. de- kllohm range. 60 "011s "n the IO-k,iohm range, 250
creasing I" 60 cl8 on the 1000~volt range. 50 Hz l" volts on ail other ranges, c"nf~n~"us rms ac + dc
180 HZ
COMMON MODE REJECTION RATIO: Greater than GENERAL
100 dB over one dIgIt on the 1 and IO-"",, ranges, POLARITY: Automal~c
decreasing to 80 dB "n the 1000-v",, range. dc lo ZERO STABILITY: 0.7 digif,`C
180 HZ with 1 kll"hrr ""balance. WARMUP: 30 minutes 1" within twice spec~hed act
MAXIMUM ALLOWABLE INPUT: ,400 volts peak curacy. two hours for complete stabilhzatlon,
mome"tary, 1000 ""It* c"ntl""""S dc + rms ac. DISPLAY: 5 d,g,ts plus 1 overrange dC range. Lead resistance will
also add to the resiscancr "ffset and should be co,,-
sidered as well.
`- Connections. ELake connections to the input HI
and LO terminals. When measuring semiconductors and
other polariiy sensitive devices it is important to
consider the polarity of the voltage developed across
the input terminals. `The HI terminal Fs negative with a. General. The M"del 190 provides BCD TX',.-type
respect co the 1.0 terminal. For grounded applications. lines which represmt each of five digits, an over-
make certain chat the shorting link is connected be- range digit i""), overload, polarity, decimal posi-
tween LO and CASE. For Elmring applications, rhe tion, and function. The lines are 8421 configuration
shorting Link must be removed. where 0 = 0000; I" addition LO data outputs the 19"
provides a Prinr ~omand and ilold Control. Refer to
b. Voltage *cross the U"k"0w". Full range "alrage Table 3-6 for digital output pin identification.
is 5 volts. At 100% overrange, the voltage across
the unknow" is 10 volts. see Theory of operation for b. Data outputs. All outputs except runcti"" 1
a mmplete explanation of open-circuit voltage con- and 2 and Hold are Series 7400 TTL circuits (see
dition. Test current for each range is give* io manufacturers literature for specilications). Polarit
Table 3-4. bin 10) and overload (pin 1) outputs are "ot buf-
fered. Function 1 and 2 outputs consist of 4.7 kii
TABLE 3-4. pull up resistors connected to the internal +5 V
`Test Current for Resistance Modes S"PPlY, Refer to Table 3-5 for function ltie coding.
I Full Range `rest current Full Range Voltage C. erinr: Command. Logic "1" appears for LOO milli-
seconds after each display update. Refer to Figure
4 for a graphic description of the A/D converter
timing.
d. Hold Control. Logic "0" retains last data in
display and digital oufput. To enable the Hold co"-
tro1, an equiva1enr of 4 TTL gates current sinking
C. Control settings. Five ranges are available on capabiliry is necessary.
the Model 190. `TWO functions can be selected, kC# and
1" m. e. COMnO". Pin 18 should be used for al.1 cmn,,~"
connections to the digital ""tput.
1. Kilohm Functian. For measurements over the
range from 0.01 ohms to 2000 kilohms, depress the f. Connectians. Use of Model 1902 Digital outp,,t
kD function pushbueco". The" depress the appro- connecfor (optional) is recommended for connections
priate range pushbucto", 1, 10, 100, or 1000. to the M/36 card edge con"ectar.
2. Ten mgohm Function. For meaSureme"tS from
100 ohms eo 20 megohms depress the 10 MS? function TABLE 3 -5.
pushbutton. Function Coding
F""C?ZiO" Functia" Line
NOTE
Both the kQ and 10 Mn pushbuttons should be Selected 1 2 3
depressed to operate in the 10 Mn mode. The
Range pushbutton switches are released when "DC 1 1 0
the 10 Mn pushbutfm is depressed to prevent "AC 0 1 1
an ambiguous mode of operation. To select KG 1 1 1
either "DC, "AC, or kn modes while in 10 MQ lam 1 0 1
mode, simply depress any one of the Range
pushbuttons and then select the desired mere Logic 0 = 10" state
F""Cti0". Logic 1 = high state
6
INPUT +lV
I
INTEGRATOR
ZERO
i
I I I
CROSSING I I
I
DETECTOR
I
PRINT I
COMMAND I
MAXIMUM CONVERSION RATE
2 READINGS PER SECOND
1277
I
p
OPERATING INSTR"CTlONS MODEL L90
3-7. MEAS"REMENT CONSI"EFATIONS 3. AC Voleage. The ac voltage accuracy is
specified in terms of a percent of reading and a
a. connections. "se of shielded input leads is percent Of range. In addition, the effects of
recommended when source resistances are greater than power dissipated in the input resistors stm~ld be
1 kihhm or when using the 10M.Z mode. care should considered whenever more cllan 400 volts is applied.
be exercised so as nof to degrade the insularian
characterisrics Of the binding posts. In the resis- 4. Resistance. hccuracy on IeSiStanCC ranges
tance modes, accuracy may be degraded if the eerminals is specified in terms of a percent of reading and
and/or leads become contaminated. care should also be a percent of range. An addieional uncertainty due
take" fO minimize effects of thermoelectric porcntia1.3 to residual resistance should also be considered.
which may be generared as a result of temperature
differences between junctions of dissimilar metals. NOTE
when making resistance measurenlents, ic is
important- co make certain that t'he 190 is
properly zeroed in "DC function. Fur example
an additional error of .OOOl% of reading can
occur per digit of voltage offset on the Ik:;
- loom ranges; .OOl% and .Ol% of reading
per digit offset on lOOOkG and 10MI: ranges
1. DC Voltage. me dc voltage accuracy is respectively.
specified in terms of a percent of reading and a
percent of range. An additional factor of .OOOOl%
of reading, per volt from full range reflects an
uncertainty due CO voltage coefficients for meas-
urements made at "ther than fuU range. Short term
accuracy is valid for a period of 24 hours afrer
complete calibration. Long term accuracy (90 days)
includes an additional .Ol% of reading uncertainty
due to aging of precision components. In addition,
the effects of power dissipated in the input resis-
t"rs should be considered whenever more than 500
volts is continuously applied (for 1 minute or
longer). Heating may cause a* additional uncertain-
ty due to the temperature coefficients of individual
circuit elements.
2. DC Current. When tire Model 1901 Currenf
Adapter is used an additional iO.3% of reading
uncertainty must be considered. As in any current
measurement the input drop should also be consider-
ed. For example, a full range drop of 200,""
across the shunt results in an error of 1% if the
source is 20 volts.
017
7
I
MODEL 190 THEORY OF OPERATION
SECTION 4. THEORY OF OPERATION
4-L. GENERAL DESCRIPTION. The Model 190 Digital 4-2. ANALM: ASSEMBLY. The following paragraphs des-
nulrinieter utilizes a modified integrating technqiue cribe individual Analog circuits in detail. These
ior A/O CO""erSio". The latest linear and digital circuits are divided according t" their primary
integrated circuits are utilized for greater relia- function in rhe system. (Refer to Schematic 25864E).
bility and servicing. The circuitry is broken down
into two major areas and assemblies; fbe Analog a. DC Atfenuafor. A 10 megohm divider using RIII-
Assembly and Digital and Power Supply Assembly. P.118, and parts of 5102 and 5101, pravides artenuario"
'me halog section provides input signal condition- for input signals above 2 VDC (100% overrange on the
i"g,atte"uatio", filtering, buffering comparixg, and 1 " range). 5102-30 is used to shart "ut the higb
initiates the main control signal for the entire impedance for better input matching a" the lowest
system. The Digital section provides logic control, dc range.
counting, decading and display. Usa located on tke
Digital assembly are the power supplies far the entire b. Input Filter. This section provides attenua-
system. The Analog assembly is connected t" the tion of ac components and noise present on dc input
Digital assembly thraugh 5301 and 5302. signals.
TO follow through a block diagram description it will C. InpuL Amplifier. Cmprised of rhree acti"e com-
be necessary to make several assumptions; assume the ponents, this circuit provides input isolation and
display is reading 0.0000, the counters have bee" re- signal conditioning. 4119 ii; a low leakage matched
set LO zero, the a"alag switch, Sl (Q117) has jut turned Fl?r providing high input impedance and matched volt-
on allowing ihe integrator to sample the voltage at age and temperature tracking. A bipolar device, "UC-
Lhe input terminals. A voltage of +lO MC is applied puts from this FET are applied directly at Q*101, a"
.o the input terminals. me 10 volt signal is routed operarional amplfier. R146, (Coarse Zero) a 100 :!
to the DC attenuator and divided t" 1 VDC which variable resistor, is used for initial balancing of
gpasses through the filter section LO bypass any AC inpw PET pair while Q106 provides a canstant curre"~
compooenc t" common. The output of the filter sec- source. 0119 and QAlOl, a" IC Operational Amplifier,
tion is applied co the input amplifier section whick provide the gain required by the Input DC Amplifier
provides signal isolation and a fixed gain of 5. The The maximum output swing at the Input timplifier, TP1,
mplifier signal, now at 5 "DC, is applied CO the is 210 MC. This output is fed directly to 9117, the
hregrarar section via Sl (Q117), Analog Switch. The Analog Switch. P"te"tiometer R155, front panel zero,
analog Switch has been turned o" by a control level is used for fine zer" adjustment.
provided by circuitry, (the primary control flip-flop),
in the Digirvl Hssembly. Application of the +5V d. Signal Switches (See Figure 5). Comprised of
signal causes the integrating capacitor, C141,,to q110, Ql16, and Q117, these solid state switches
charge for a fixed period of time, (approximately provide high speed, low leakage paths for signals
500 milliseconds), or 200,000 counta. The final applied to the Integrating Amplifier. These switches
count pulse clears the COunrerS to 0.0000. AT the are drive" by logic levels fram the Digital Assembly
end of this period of time, a combinaeia" of a lo& with Q109 and Qlll through Q115 supplying buffering.
level at the zero detector amplifier, and the resef-
ting of the primary control flip-flop, causes S1 e. Integrating Amplifier. Also a bipolar circuit
(Q117) Analog Switch, to turn off and 53 CQ116), this Amplifier integrates dc levels fram signals ap-
minus Reference switch, to turn on. The counter plied through S1 (41171, 52 (QllO), and S3 (9116). A
starts counting towards 200,000 again. With a minus unity dc Cain Amplifier, rhe precision ramps created
input from the reference now applied to the Integrat- by the time c""stants of RI01 and Cl41 are directly
ing hplifier, C141, begins t" discharge towards zem. proportional co the clock speed in the Digital Section.
Upon reaching zero ""its, the zero detect"= Amplifier Using a modified dual slope principal, the charge
creates a logic pulse that stops the counter which time of Cl41 is fixed at appmximately 500 ms, while
due t" the relationship of the Integrator and clock the discharge time is a function of the input voltage.
has counted t" 100,000. This pulse becomes a primary The maximum swing at the output of this amplifier,
control far the lagic, it is gated to farm a strobe TP4, is approximately t12 v peak. The output is fed
far the storage section. Information prek?ent in dir-ect1y to the comparator.
storage is now made available t" the decoder section
which furnishes levels that light the display with f. Zero Defecfor - Comparator. This circuit
the counted "umber 100,000. A delayed strobe pulse creates the main control pulse and logic level nec-
fallows within 1.0 microsecond which resets the essary for proper digital and analog functions. QA106,
counters to zero, and resets the primary central an IC Operational Amplifier, provides a dc gain ior
flip-flop. This3 causes s3, (9116) minus Reference signals less than +I00 uV. The level at the output
Swirch, to turn off, and S1 (Q117) Analog Switch, t" of QA107, is determined by the polarity of the unknown
turn 0".
1075 9
I
THEORY OF OPERaION MODEL 190
10
DCV DIVIDER FILTER INPUT AMPL[FIER
- --
r------- 1---- T--~-----I
1 VDC
TO A/O
CONVERTER
HI
T'VVG I
>
INPUT
9
TERMINALS
10 100 1000
LO
"DC WC
P
WC
RI56
i
11
FIGURE 6. SimpLifFed "iagram Of DC Voltage Mode.
ACYOIYlDLR
------- AC,DC
CONYtRTOi
---_ FILTER
r---- r---- ----r----i
1073
I
I I lkn
2kn
CONVERTER
FIGURE 9. Simplifiad Diagram of A/D converter
1073
SECTION 5. ACCESSORIES
5-s. GENERAL. The following Keithley *cces~ories can 5-2. OPERATING INSTK"CTIONS. A separate 1nsrruction
be used with the Model 190 eo provide additional con- Manual is supplied witi, eacn accessory giving complete
venience and versatility. operaring information.
Modes190s current Adapter
Description: Application:
Five Switched decade shunts of 0.1 ohm to 1 kilohm me Modes 1901 muy be used on ac an* dc voscagr rnnges
50.3%. Maximum continuous voltage drop is 7.00 rn". of the 190 to measure currents up to 200 rd. Adapter
Shunt resistors are connected so as to eliminate con- plugs into input terminals.
tact resistance errors.
Modes 1902 Output connector
Description: Application:
Mating card-edge ~"nnector for digital output (18136 Provides access to ass 36 pins at digital ""tpuits.
pins). connector plugs into card edge at rear panes Enables CUStom wiring to digital printers or other
of the 190. digital acquisition equipment.
Model 1903 Calibration cover
Application:
Used whenever calibration adjustments are necessary.
Confrols are identified by circuit designation as
shown OrI schematics.
14
1073
SECTION 6. REPLACEABLE PARTS
REPLACEABLE PARTS
-- Chassis Assembly -- --
1 Side Panel, Left 1 25859A
2 Side Panel, Right 1 25832C
3 Rear Panel 1 25840B
4 Front Panel I 2583OC
5 O"erlay 1 258608
_- Will&J" L 25843A
6 Top Cover 1 25836C
7 Bottom ccmer Assembly 1 25846B
^- Bottom cover 1 25835C
-- Tilt Bail 1 24879B
-- Feet, Molded 4 243228
_- Rubber Ball 4 FE-6
8 screw, Flat Phil. Hd. 4 116-32 x 5/W
9 Knob Assembly t 25151A
10 Buttons, white 8 -_
16
1073
I
17
1073
I
Mfr. Keithley
oesig. Pare No.
.8-U DF. "AR . . . . 73899 5C154Y c253-.8-12P
33 pF, 500", Mica . . . 14655 CDlOED330J03 C236-33P
.8-l* pF, "AR . . 73899 5C154Y c253-.8-12P
390 pF, soov, Mica. . . . . 14655 CD19ED391J03 C236-39OP
.8-12 pF, "AR . . . 73899 5C154Y C253-.R-12P
4700 pF, 500", Mica . . 14655 CD19ED471JO3 C236-47OOP
.Ol uF. 6OOv, PolyP . 97419 M2WFO.l~F c**o-0. lM
2 pF, 500", pica. . . . 14655 CD10CD020D03 c231-2P
2 PF, 500", Mica. . 14655 CD10CD020D03 C231-ZP
.a-18 pF, 750", via . . 72982 567-013 c225-.8-18P
4.7 "F. 20". WT. . 17554 TSDl-20 c179-4.7x
4.7 pF, zov; ETT. . 17554 TSDl-20 C179-4.7M
56 UF, ZO", ETT . . . . . 17554 TS"l-20 C179-56M
100 pF, 500". Nica. . . 14655 CDLOED101J03 C236-1OOP
20 p, 500", Mica . . . . . 14655 CD10ED200J03 C236-2OP
100 p, 15", Epoxy. . . . . 17554 TD5-015-107-10 C228-1OOM
2.0 UF, 50", Mx. . . . . . . 14752 625BlA CZOl-2.OM
0.1 gF, 250", MtF . . 73445 C280AE C178-.LN
1.0 uF, 5O", MtF. . . 14752 625BU.105 c215-1.011
0.22 PF, 250", MtF. . . . . . 73445 C28OAE Cl,&.22M
0.1 UF, 250". MfF . . . . 73445 C280AE C178-.LM
,047 UF, ZOO", MFCb . 14752 62581C473 C221-.047M
.047 pF, ZOO", MPCb . 14752 625BlC473 C221-.047M
0.01 pF, 500", CerD . . . . . 72982 871-25"0103M c**-.olM
0.1 "F, 250", MtF . . . . . . 73445 C280AE C178-.LM
.Ol UF, 500", cero. . 72982 871-25"0103M c**-. OlM
.047 IIF, ZOO", MPCb . . . . . . 14752 625BlC473 C221-.047M
.Ol IJF, 500", CerD. . . . . 72982 871-Z5"0103M c**-. OlM
0.1 uF, 250", MfP . . . . 73445 C280.G CL78-0.0,
Not "sed. . . ... . .. .... . . ..
0.1 IrF, 250", MCF . 73445 c**oAE CL78-O.LM
4.7 UF, ZO", ETT. . . . 17554 TSOl-20 C179-4.7M
33 DF. 1000". CerD. . . . . . . 71590 m-330 C64-33P
O.l'~i, 25OV; MtF . . 73445 C28OAE C178-O.lM
33 pF, lOOO", cem. . . . . . 71590 m-330 C64-33P
.oo** pF. 1000", CerD ................ 56289 LOSS-022 C64-.OO**M
.0022 UF, lOOOV, cero ................ 56289 loss-D** C64-.OO**M
20 PF, soov, Mica .................. 14655 CD10E0200J03 C236-2OP
20 PF, 5oov, Mica .................. 14655 CD10E!x00J03 C236-2OP
20 pF, 500", Mica .................. 14655 CD10ED200J03 C236-2OP
1.0 VF, loo", Poly. ................. 97419 PYW-R (1.0) C142-l.OM
0.1 uF. 250", MtF .................. 73445 C280AE C178-o.lM
33 pF, lOOO", cero. ................. 71590 "O-330 C64-33P
0.1 LIF, 250", MfF .................. 73445 C280AE C178-0.m
0.1 uF, 25OV, MtF .................. 73445 C280AE C178-O.LM
Not Used. ...................... ... .. .. .
NOf Used. ...................... . ........ .. .
0.1 !S, 25OV, MtF .................. 73445 C280AE C178-0.1M
5 pF, lOOO", cero .................. 71590 m-050 C64-5P
0.1 UF, 25OV, MfF .................. 13445 C28OAE C178-o.lM
`\Nb.LOC SECTION (Coni'd)
(Schematic 25864E)
CAPACITORS (`zont'd)
CiITtliC Mfr. >,tEr.
IkSiR. Description Code - oesig.
Cl51 0.1 iiF. 250", XCF 73445 C?ROAE
Cl52 .oo** JF, IOOO", Cer" 56289 loss-LIZ?
Cl53 0068 PF, 500", Cer". . 72982 d51-25U"-682~
Cl54 150 pF, IOOO", CerD . . ~ 71590 DO-151
Cl55 150 pF, lOOO", certl . . . . . . 71590 W-151
Cl56 5 PI?, 1000", cem . 71590 La-050
Ill01 Transistor, NPN, Case 'R-106. ............ 07263 2N3565
"102 Transistor, NPN, Case TO-106. . 07263 2X3565
"103 75" PI", 75 Ill`, .................... 01295
0104 75VPIV.75~ .................... 01295
D105 75YPI", 75~ .................... 01295
0106 Zener, 6.3V, 1/4W .................. N-C IN827AX
0107 75V PIV, 75 n*. ................... 01295 IN914
D108 15" PI", 75 nut. ................... 01295 IN914
DlO9 75"PI".75mA .................... 01295 lN914
DllO 75v PI", 75 !A. ................... 01295 lN914
Dlll 01295 IN914
0112 01295 I%914
0113 01295 1N914
0114 01295
D115 01295 lN914
0116 12954 lN706
"117 . ...
D118 06751 IN703A
0119 06751 1N70JA
0120 01295 lN914
0121 01295 13914
Mfr. Mfr.
-
.JlOl Binding Post (Red) HI ..................... 820-65
.I102 Binding Posf (Blk) LO ..................... RZO-45
5103 Binding Post (cm) CASE .................... 820-95
M-C = MICROSEMICOND"CTOR
0177
ANALOG SECTION (Cont'd)
(Schematic 25864E)
TRANSISTORS
Mr.
CO&
N-Ckm FET, case TO-72. 04713 2N4220 TC-42 i
NPN, case TO-92 . 04713 2N5089 W-62 2
NPN, case TO-92 04713 2N5089 TC-62
NPN, case TO-92 04713 2N3903 TG-49 7
NPN, case TO-92 04713 2N3903 'X-49
NPX, case TO-92 04713 2N3903 n-49
I's*, case 'CO-92 04713 2N3905 K-53 5
NPN, case 'TO-92 . 04713 ZN3903 'U-49
NPN, Case TO-92 04713 2N3903 'R-49
?I-Cha*, J-FET, case TO-18 . 32293 ITS3538 V-88
PNP, case TO-92 04713 au905 `R-53
NPN, case TO-92 . . 04713 2N3903 x-49
FNP, case TO-92 04713 *I?3905 x-53
NPK, case TO-92 . . . 04713 2N3903 TG-49
PXP, case IO-92 I 04713 2N3905 'U-53
N-Ghan J-FET, Case TO-18. . . . 32293 ITS3538 X-88
N-ma" J-FET, case TO-18. , 32293 1153538 P-88
PNP, case TO-92 . . . . 04713 2N3905 K-53
Dual wchan J-FET, case TO-71 32293 ITS30092 TC-9R 1
1
INTEGRATED CLRCUITS
Mfr.
Iksig.
QAlOl Operational Amplifier, 8-pin, Case TO-99. 24355 m741* IC-97 1
QUO2 Not Used. . . .
Qb.103 Operaeional Amplifier, 8-pin, Case TO-99. . . . . . . 12040 LK308" K-67 1
Quo4 Operational i\mplLfier* 8-pin DIP. . . . . . . 32293 ITS6214 n-74 2
QR.105 Operational Amplifier, 8-pin DIP. . . . 32293 ITS6214 K-74
QUO6 Amplifier, 8-pin, DIP . . . . . . . 12040 LM30L4N ic-24 2
Q.&l07 Amplifier, 8-pin. DLP . . . . 12040 LM301AN K-24
*Selected, order by Keifhley Part NO. IC-97.
SlOl Switch, Function. ........ ......... 80164 SW-370 Ilront Panel
s102 SWitCh, Range .......... ......... 80164 SW-369 Front Panel
20 1075
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