Service Manuals, User Guides, Schematic Diagrams or docs for : Keithley 167 167(Model167AutoProbe)
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INSTRUCTION MANUAL
MODEL
167
AUTO-PROBE'"
DIGITAL MULTIMETER
SECTION CONTENTS PACE
Title Page i
contents
List al IliusfraLions. ,::
speciiicnrion. : : i"
1. General information. L
L-L. InLrodufcio" I
L-2. werranq In~ormti"" L
1-3. Change Notice. L
L-4. iipplicationr 2
2. 1nitie1 Preparation.
z-i. cenere,. :
2-2. Inspection
2-3. Preporsfion for "30. :
3. operating 1osrructi"nl 4
3-L. Genersl.
3-2. Turn-o" Procedure. 2
1-3. Connecrions.
3-4. luncfion Selecrio" t
3-5. Operafion as * VOltmeter
3-6. "peretio" 81 an UhmmeLer :
3.7. operation as an b.metsr.
3-8. llerrery operstion. ::
1-9. Line Operer~on
3-10. huxiliery Power operation. ::
z-11. oartery LifF 14
3.12. "*splay. 16
4. Theory Of operstion. 18
4-L. General. 18
4-2. Analog circuitry 19
4-3. r'igite, Circulfry.
4-4. UC "okage operetion : : : :;
4-5. AC YolLega operation 26
4-6. ems operation
4-7. Yower supply :i
5. MainLenanee.
5-l. General. : : : : : : : : : : : : :;
5-2. Kequired wet Eqvipmenf. 29
i-3. Performance Cheeks 21
5-4. Ad,ustmenc end Cal`bralion Procedure 13
5-i. Iroublesllooring. 4,
5-6. Battery Test 4,
5-7. mttery Keplacernenl. 4,
5-8. Battery margin* 42
6. KeplaceQble Parts.
6-1. General. 2:
6-2. Ordering InforlMfion 41
6-3. crose Keiaranee.
6.4. Parts List 2;
6-5. Code-Lo-Nam Li8L. : : : 63
1. Schematic Diagrams 65
I-Z. Block IJiegrem, NO. 253540. : :
1-3. Power SyaLem, NO. 25340" :;
7-i. *"clog circuitry. NO. 213420 69
7-i. "igifsl circuitry, No. 253430. 70
Appendix
A. service For",
8. Change Notice
ILLUSTRATIONS
SPECIFICATIONS
I i"
SECTION 1. GENERAL INFORMATION
SECTION 2. INITIAL PREPARATION
2-1. CENWAL. This SCCti"n describes procedures for incoming inspection and
preparation far use.
SECTION 3. OPERATING INSTRUCTIONS
4
3-4. FUNCTION SELECTION. FOUR front panel pushbuttons are used for selection
of ac volts (AC"), dc volts (DCV), resistance (CmS), or power off (OFF).
a. DC" Operation. The Model 167 automatically indicates dc voltages from
1 mv to 999" With polarity automatically indicated.
1. MeaS"Iement Procedure. Depress the "DC"" pushbutton to select dc
voltage measurements. Make input connections using the probe or front panel
"HI" and "1.0" terminals as described in paragraph 3-3. Depress the "push-
co-read" switch to turn-on the display. me Model 167 aumnatically ranges
to the proper range with decimal point and polaricy automatically indicated.
A lighted "minus" sign is displayed for negative dc voltages. A positive
polarity is not indicated but is implied when the "minus" sign is turned off.
3. Accuracy. me Model 167 accuracy is specified as ?0.2% of reading ?I
digit over the entire voltage range.
4. Maximum Input. The maXimum input voltage which can be applied is
specified as 1200" (dc + peak ac). The Model 167 display flashes when the
input exceeds i999 volts although the reading will be displayed up to the
maxFm"m dc input.
6
I MODEL
167 OPERATING INSTRUCTIONS
2. Input Impedance. me input resistance IS 50 megohms over the e"Cire
voltage range. me shunt capacitance is approximately 220 picofarads.
3. Accuracy. The Model 167 is an average-readiny meter which is calibrated
in terms of the rms value Of a sine wave. The basic accuracy 18 `1 % of
reading i 2 digits (up to 2OOV, 20 Hz to 10 kHz).
C. Accuraq. me Model 167 accuracy is specified as 20.3% of reading 2'
digit 2' ohm.
d. mximum input. the maximum input voltage which can be applied to the
input when in ttlc "OHMS" mode is 130" dc or ac rme. If this voltage is exceeded
and connected f"1. m"re etLan a few seconds, overheaLing of the raw2.e resistors
may occur with subsequent change to the accuracy.
,,,,,,,~ ,,,.,
,, /,
8
OPERATING 1NSTK"CTIONS MODEL 16i
3-8. BATTERY OPERATION. The Model 167 is shipped from the factory with six
alkaline '9" cells installed in the baefery compartment so that the Model 167
is ready-to-use.
b. Battery *est. TO test the battery voltage while the Model 167 is op-
erating, depress the "DCV" pushbutton and touch the probe to the "BATTERY TEST"
terminal on the rear panel. Depress 'the "push-to-read" bar along the top Of
the probe and read the voltage displayed on the probe. Replace the alkaline
cells if the voltage is less than 6 volts. If nickel-cadmium cells are in-
stalled, recharge using the Model 1671 Recharger if the voltage is less than
? volts. The battery voltage should be at least 7 volts under load to ensure
that the instrument will turn on.
NOTE
CAUTION
Do not charge alkaline, zinc-carbon, or mercury batteries since the
cells may leak or explode causing subsequent damage to the instrument,
12 1272R
"172
I 14
"172
2v
20"
2"""
loo""
SECTION 4. THEORY OF OPERATION
,b. compactness and high reliability are provided through the use of a dig-
ital LSI, a completely solid-state LED display, and thick-film resistor net-
works.
C. LOWpower diSSipation is achieved through the use of an efficient switch-
ing regulator and a11 solid state construction.
167 BLOCK DIAGRAM
`Nc
FULL WAVE A-D
RECTIFIER CONVERTOR
RANGE
1
18
MODEL 167 THEORY OF OPERATION
2"
I MODEL
167 TUCORY OF OPEPdTION
I
. . . . . . . . . ..
-a .
i"~To".i i"`T'".i y-q* ,..: :... Tj ,..:
. . .
-f :
. . . . ... . . :
24
DC OPERATION
SOM-5OK
ALWAYS
FULL POSlTwE
$AVE
AC OPERATION
SOM-50K
P4
50M
0 -fI WV
F/L.
0172
SECTION 5. MAINTENANCE
I MOUEL 167 MIIINTtiNANCE
32
"172 33
FIGUKE 2". Top cover Assembly
I 34 "172
35
e. AC" Calibration. (P er f arm the DC" calibration before making the following
adjustments.)
+ +
- L
42
CAUTICJN
DO nor charge alkaline, zinc-carbon, or mercury batteries since the eelis
may leak or explode.
b. Battery Test. After recharging or replacing Ni-Cad cells, turn on the
Model 167 to verify proper operat.ion. If the instrument does not turn on,
check the polarity orientation of each cell. If instrument t"r"S "" normslly,
check the battery valeage using the probe at the "l3ATTELIY TCST" rennina, on
the rear panel. The voltage should be at least 7.2 volts for a fuliy charged
set of Ni-Cad cells. If voltage is Low, recharge at leasteighc more hours.*
If in doubt, replace with a new set of Ni-Cad batteries. Order replacement
ba?teries by specifying the Model 1678 Rechargeable battery kit.
*NOTE
The Model 167 can be used for contin"ous operation with the Model 167L
connected, since the l&charger supplies power to the i"ser"menC automat-
ically. The battery cells will be charged at a reduced rate, therefore,
a longer recharging time will be required.
MAINTENANCE MODEL 167
---- I
PIN I
MODEL 167 REPLACEABLE PARTS
SECTION 6. REPLACEABLE PARTS
6-1. GENERAL. This section contains information for ordering replacement
parts. Table 6-2 lists the individual parts in alptmmeric order of their cir-
cuit Designations giving location and corresponding Keirhley stock part number.
Table 6-3 lists the parts by the Circuits Designation number giving quantiLy per
assembly, complete description, suggested manufacturer, manufacturer's desig-
nation, and Keitblcy pert number used when ordering parts from the factory.
Table 6-l gives the abbreviations and symbols used in the instruction manual.
A manufacturer code to name listing is given in Table 6-5.
6-2. ORDERING INFORMATION. TO place an order or obtain information concern-
ing replacemene parts, contact your Keithley representative or the factory.
When ordering parts, include the following information:
a. Instrument Model Number
b. ~nserument Serial Number
Part Deacripfion
i: Circuit Designation (if applicable)
e. Keichley Stock Part Number
NOTE
hy part which is identified as 8 Ketthley code 80164 is a cwtom designed
or selected part available only from the factory.
45
s
c i ci
L! -
-
C22-.O",M
C22-.""LM
m-.""LM
c22-.""1M
2
-
MODEL 167
FIGURE25. Component Layout, KesisLorS
0172 53
FIGURE 28. Printed circuit PC-307
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