Detailed instructions for use are in the User's Guide.
[. . . ] Operating Environment: 0o to 50oC;less than S}Vorelat\ve humidity up to 35oC, less than 70% relative humidity from35oC. to 5OoC. than 0. 1 X applicable accuracy specification per Power: 9V alkaline or carbon-zinc battery (NEDA 1604) Battery Life: 100 hours typical with carbon-zinc cells 200
hours with alkaline cells.
Al. o pair of fast switching high cttrrcrrt siltc()rr (li()des " plus a fuse provide excellent protection on rll ' ttttt ttt rrtrtgcs' Furthermore, the input of the analog to ililiitrrl I ()trvcrtcr
is protccted against overvoltages.
jacks are sheathed thus avoiding dangerous corl'rfcti()rrs to -eventual high voltages. lirtgcr stoppers to k""p fingers away from the barc cnd' 'Ilr(: l)r'od t"r-in"ls are sufficiently long and slendcr to rcach :tny tt:st points found in actual boards.
Frotected Inpuf Socket and Test Lrads The 0. 16 in. input sockets are fully rcccsse'l 'ttrrl protected against accidental contacts The tcst lcarls srtpl>licd with the equipment give added safety to tltc usct sitrt. [. . . ] Voltage Drop 0. 25 0. 25 0. 25 0. 25 0. 75 0. 30 V V V V V
AC Current
Range Resolution
Accuracy
Max. F. S.
Voltage Drop
100nA lp. A 10pA 100pA 1mA 10mA
!(O. 5% rdg + 1 digit)
!(0. 5% rdg + !(0. 5% rdg+
+(0. 75% rdg+
1 digir) 1 digit)
+(2%rdg+5digits) +(2%rdg+5digits)
l
disit)
v
Overload Protection mA Input: 2Al250Y 10A Input: Unfused up to 15A for
fuc.
1
+ (2%rdg+ 5 digits) Overload Protection mA Input: 24/250V fuse 10A Input: unfused up to 15A for 15 sec.
Resistance
2mA 1pA 20mA 1OpA 200mA 10OpA 2000mA lmA 10A 10mA
200p"4
100nA
!(0. 75Vo rdg + 5 digits) t Q% rae + 5 digits)
x
(0. 7 5% rdg
+ 5 digits)
0. 25V rms 0. 25V rms 0. 25V rms 0. 25V rms 0. 75V rms 0. 30V rms
5 sccortds.
AC Voltage
Range
Resolution
100p. V
Acctrracy
Freq Range
Range
Resolution
Accuracy
Max, Open
Circuit V
2. 8 500 500 500 500
2V 1mV 20V 1OmV !(0. 5% rdg + 5 digits) 200V 100mV on all ranges + (l% ds + 5 disits) 750V lV
cxcept 200mV
200mV
45Hz - 500H2 on all ranges
2004 2KA 20KO 200Ka 2Ms} 20Mo
100mO
ls}
10sl
1000
1KO 10KO
digits) x(0. 3% rdg+ 1 digit) x (0. 3% rdg + 1 digit) !(2. 5% rdg + 5 digits)
(0. 5% rdg + 3
!
2, 8v
v
mV mV mV mV
Convcrsion: Calibrated for rms of sine wave lnput Impedance: 10M shunted by 100pF on all ranges
Max aliowable input: 500V dc or rms.
trnt". _
U
_
-6-
Continui9Test
Resoonse
('ttl
)
4. OPERATING INSTRUCTIONS
General
Resistance range: Btzzer sounds with rcsistances less than
200O approximately. time: Less than 100 m Sec.
Diode
Test
( -t<-
)
Test voltage: 2. 8 Volts
Maximum test current: 3m Ampcres,
Temperature Measurement
Range
OoF
Re
solution
1oF
Accuracy
ro
2000oF
Sensor; type K
(NiCr-NiAI)
!
+ (50 + 2 aigitr;
3%
, p to ZZSof
sturment that is accurate, reliable and always ready for use. Equipped with nine functions and 36 ranges, each test position is quickly and easily selected with a simple rurn of the single selector switch. Smail enough to fit in attache cases and equippid -*'rth a multi-position tilt stand. This instruments is equally suited for design engineering, production. testing, field servicing, and industriJl mainienance
apprlcatlons.
The Sears Model 824131C950-52477-5 is completely portable, high level 3-112 dig:^t multimeter designed for use by the engineer, technician, and hobbyist who demands an in-
of
rdg ovcr 2250F
Conductance Measurement
Range 200nS
wffi;s
T. The reading is in Fahrenheit
Connect test leads to the measuring point and read the value on Digital DisPlaY' , l
q
I
ral A' r' S; SIMENS
=
-oh;
= international unit of
con-
B. The readout is in terms cif conductance with unit
ductance formerly known as the mho.
2.
r "F).
nS (10-95). If resistance rcading is required, yo11 can divide I by the t""Jo"i, ft"ti-"rtdly by'i010' Use conductance measurement as a leakage tester. The S conductance mngp effectively extends the resistance measurement capability of this DMM to the point up to 10, 000M ohm where it can be used to provide useful leakage measurement on variable components, diodes, cables, connectors, printed- circuit 6oards (pcb's), etc. In all cases the test voltage is
The meter is designed to show temperature automatically when a thermocouple is plugged into the jack' but the display will show "1" when no thermocouple is
connected.
<5V DC. I x 1010 = 0. 1 X 1010 = Resistance
Readout
(ohm)
For ExamPle; If the measurement result is 10, the resistance reading
@leadto"coM".
2.
switch to "S
Conductance Neasyrenebt
POWER/FUNCTION switch
) to "DC O" , and RANGE
is
=1" o
I
I
J x toto = 0. 1 X loro = l, oooM ohm 10"
If the measurement result is 1000
1.
, ^*^ rvvv
1.
|
x
l0ro
. ^
It is necessary to replace battery when the words "LO BAT" appears in the upper left corner of the LCD
scteen.
=l0Xl06ohm
= l0M ohm
=0. 001 x1010
3.
Range
2.
Capacitance Measurement
it inward. For maximum life use Sears DieHard alkaline 9 volt battery, although any standard 9 volt
Slide the battery cover upward by pressing
2. 2.
measurement, all capacitance ranges should be set to zero, with an open condition without a condenser connected to CAP sockets, rurn the "CAP ZERO ADJ" so that zero reads on display. Connect capacitance test leads to condesser (For measurement of polarized qondensers, have the polarities of the CAP sockets, agree with those of a condenser). Read capacitance vaiue on Digital Display.
POIIVER/FUNCTION switch to "DC S|" , and switch to desired "CAP" position.
4.
battery is suitable. Piace the battery covet
in right
position.
fry-R"PbIgggtIt
1. [. . . ] Adiust VR7
68"F+77oP=113oF
6,
Set the reat cover to the instrument by tightening three
screws.
4-1. 2000pF Slide POWER/FUNCTION switch to "DC O" , and RANGE switch to 2000 p position, Turn the "CAP ZERO ADJ", so that zero reading on display. Connect 100pF standard capacitor to CAP test leads, and tur:n the VR3 so that 1000 reading on display.
icAtnloNl
The calibration procedures should be perforrned in regular sequence. Always DC voltage must be adjusted pdor to AC voltage adjustment.
_ 15_
-
16
-
PART LIST
SYMBOL
U1
DESCRIPTION
U2 U3 U4 U5 BU1
A/D CONVERTER ICL
OP AMP SFC 2776
71 06
EX or GATE CD4070 or CD4030
R5 R6 R7 R8
DUAL TIMER NE556
OP AMP LM3O8A OP AMP TL061 NAND GATE CD4O1
Rll
R9, 10
R1 2, 13
1
BU2
LCD
cs1
D7, 2 D3- 10
BD1
Q 1, 2, 3, 5, 6 Q4
7Dl
LCD DlSpLAy 3v2 DlctT (5 1 3031. 303R) CURRENT SOURCE LM334 TR, SI, NPN, 2N 3904 TR, SI, NPN, MPSA92 DIODE, SI, 1N 54OO DloDE, Sr, Sw lN 4148 DroDE, sr, sw 1N 4148
R14 R15 R16 R17 R18 R19 R20 R21
R ESTSTOR
RESISTOR 4OOKA 74W F. CARBoN
RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR
9OOO %W C. [. . . ]