Metravi 23Smkll User manual

DIGITAL MULTIMETER
OPERATION MANUAL
Metravi 23Smkll
1. SUMMARIZE
The instrument is a steady performance, battery-driven digital 4 1/2
digit digital multimete. It uses the LCD with 39.5mm-high figure to make
the reading clear.The function of 5 sec. Backlight displaying and overload
protection make operation more converient.
The instrument has the function of measuring DCV, ACV, DCA,ACA
resistance, capacitance, temperature and frequency, diode, and contin-
uity performance tset. It adops double intergral A/D converter as its core,
it is an excellent tool for labs,factories and radi-technology.
1. Do not input a over range value when measuring.
2. Voltage less than 36V is a safety voltage. When measuring voltage
higher than DC 36V, AC 25V check the connection and insulation of
test leads to avoid electric shock.
3. Be sure to keep the test leads off the testing points when switching
function and range.
4. Select correct function and range to avoid fault operation, you may
still be careful to ensure the safety even the meter has all range
protection function.
5. Please do not measuring before battery isn't installed and back cap
is not firm.
6. Please do not input voltage when measuring resistance.
7. Please move the test leads away from test points and turn off the
power before replacing batter fuse.
8. Introduction for safety symbol
This instrument is designed according to IEC1010 standard(safety
standard issued by IEC),Please read the manual before operation.
2. SAFETYNOTE
exists high voltage
GND
dual insulation
must refer to manual
low battery
1
3. CHARACTERISTIC
3-1. General
1. Displaying: LCD dispaying.
2. Max,indication: 1999(4 1/2)digits,auto polarity indication.
3. Measuring method: double integral A/D conversion.
4. Sampling rate: approx 3 times/sec.
5. Over-range display: 1 displays in the highest digit.
6. Low battery display: .“ ”
7. Working environment:(0～40)℃, relative humidity <80%.
8. Power supply: one 9V battery (NEDA 1604/6F22 or equivalent).
9. Dimension: 190x94.5x39.5mm (length/width/height).
10. Weight: approx .400g (including 9V battery).
11. Accessories: test leads, user manual,temperature probe,holster,
gift box, and 9V battery.
3-2.Technical characeridtic
1. Accuracy:±a%( xrdg+dgt) environment temperature at (23±5)℃,
relative humidity<75%, one year guarantee since production date.
2.Performance:
Measuring DCV, ACV, DCV, ACA, resistance Ω, capactiance C,
frequency f, temperature T, diode/continuity performance testing, with
auto power off, backlight and data hold function.
3. Technical Parameter
A. DC Volt (DCV)
200mV
2V
200V
20V
1000V ±(0.2%rdg+5dgt)
10uV
100uV
10mV
100mV
Range Resolution Accuracy Overload protection
1mV
±(0.1%rdg+5dgt)
Input resistance: All range is 10MΩ.
Overload protection: 250V DC or AC effective value for range 200mV
1000V DC or 750V AC effective value.
B. ACV
1000V DC/
750V AC RMS
±(0.8%rdg+25dgt)
±(1.0%rdg+25dgt)
2V
20V
200V
750V
100uV
1mV
10mV
100mV
Range Resolution Accuracy Overload protection
1000V DC/
750V AC RMS
Input impedance: All range is 10MΩ.
Overload protection: 1000V DC or 750V AC effective value.
Frequency response: (40～400)Hz range under 200V;
(40～200)Hz for range 750V.
Displaying: Sine wave rms (Average value response).
C. DCA
±(0.5%rdg+4dgt)
±(0.8%rdg+6dgt)
±(2.0%rdg+15dgt)
0.2A/250V MAX
15A MAX
200uA
1mA
2mA
20mA
200mA
20A
0.01uA
0.1uA
1uA
10uA
Overload protection
Accuracy
Resolution
Range
Max measurement voltage drop: 200mV
Max input current: 20A (within 10 seconds)
Overload protection: 0.2A/250V resettable fuse , 20A measuring
range 15A/250V time-lag fuse.
D. ACA
20mA
200mA
20A
10uA
1mA
±(1.5%rdg+25dgt)
±(2.5%rdg+35dgt)
0.2A/250V MAX
15A MAX
AccuracyResolution
Range
1uA
Max measurement voltage drop: 200mV
Max input current: 20A (within 10 seconds)
Overload protection: 0.2A/250V resettable fuse , 20A measuring
range 15A/250V time-lag fuse.
Frequency response: (40 ～200)Hz.
Display: Sine wave RMS (Average value response).
E. Resistance( Ω )
(0.4%rdg+10dtg)
(0.4%rdg+5dtg)
[5.0%(Reading -
1000)+10]
250V DC/AC
effective
value
200Ω
2KΩ
20KΩ
200KΩ
2MΩ
200MΩ
0.01Ω
0.1Ω
1Ω
10Ω
100Ω
10KΩ
Range Resolution Accuracy Overload
protection
Open circuit: less than 3V
Overload protection: 250V DC or AC effective value.
a. At range 200Ω , short-circuit the test leads to measure the wire
resistance, then subtracts it from the real measurement.
b. At range200MΩ , when the test leads short circuit, LCD display
1.0MΩ.It is normal and doesn’t affect the accuracy. Please
deduct the value from the real measurement.
F. Capacitance (F)
±(3.5%rdg+10dgt)
±(3.8%rdg+20dgt)
36V DC/AC
effective
value
20nF
2uF
200uF
1pF
100pF
10nF
Range Resolution Accuracy Overload protection
Testing frequency: 400Hz
Overload protection: 36V DC or AC effective value.
2
43
Overload protection

23Smkll
56
78
G. Frequency (Hz)
±(3.0%rdg+150dgt) 250V DC/AC
effective value
20KHz
200KHz
1Hz
10Hz
Range Resolution Accuracy Overload protection
Input sensitivity: 2V effective value.
Overload protection: 36V DC or AC effective value. (within 10 sec)
H. Diode and continuity performance test.
the positive DC
current is approx.
1mA,negative
voltage is approx
3V
open voltage is
approx 3V
Positive voltage
drop of diode
Buzzer sounds,the resista-
nce is less than(70±20)Ω
36V DC/AC
effective
value
Range Resolution threshold Overload
protection
Overload protection: 250V DC or AC effective value.
CAUTION: Do not input voltage at this range!
I. Temperature (℃)
Range Resolution Accuracy
(-20～1000)℃0.1℃±(0.8%rdg+40dgt)≤400℃
±(1.5%rdg+150dgt)≥400℃
K-type Thermoelement (banana plug type, temperature: -20 ～250℃)
4. OPERATION
4-1. P anel description
1. LCD:display the measuring value.
2. POWER: turn on/off the power.
3. : turn on/off the back light.
4. Continuity testing indicator.
5. HOLD key: press it ,the presently
measured value is held on LCD and
"H"symbol displays. press it again ,"H"
symbol disappears, and the meter is
exited the holding mode.
6. knob: to select measuring functio and range.
7. Voltage, resistance, frequency and diode jack.
8. GND, the anode jack of test capacitance and temperature.
9. Jack for measuring current 20A.
10. Jack for the cathode of capacitance, temperature and current
lower than 200mA.
4-2. DCV measurement
1. Insert the black test lead into the COM”jack and the red one into the “
“ ” jack.
2. Set the bnob to a proper DCV range, and connect the leads crossly to
the electric circuit under test, LCD displays polarity and voltage under
test connected by the red test lead.
NOTE:
①.Firstly users should select the knob to the highest range, if users
had no idea about the range of voltage under test, and then select
the proper range based on displaying value.
②.If LCD lead displays “1” it means meter is over the max. Value of
range, thus should select the knob to a higher range.
③. Do not input a voltage over DC 1000V.
④. Be careful while measuring a high voltage. don't touch the high circuit.
4-3. ACV measurement
1. Insert the black test lead into the jack and the red one into the “COM”
jack.“ ”
2. Select the knob to a proper ACV range, and then connect the leads
crossly to the electric circuit under test.
NOTE:
①. Firstly users should select the knob to the highest range, if users had
no idea about the range of voltage under test, and then select the
proper range based on displaying value.
②. If LCD displays it means meter is over the max, value of range, “1”
thus should set the knob to a higher range.
③. Do not input a voltage over 750V effective.
④. Be careful while measuring a high voltage, touch the voltage don't
circuit.
4-4. DCA Measurement
1. Insert the black test lead into the jack and the red one into the“COM” “mA”
jack (the Max 200mA) . or to (the max 20A).“20A”
2. Set the knob to a proper DCA range, and connect the leads crossly to the
electric circuit under test; LCD displays polarity and current under test
connected by the red test lead.
NOTE:
①. Firstly users should selectt the knob to the highest range, if users had
no idea about the range of current under test, and then select the proper
range based on displaying value.If the LCD displays means the “1”
current is over range. thus should select the knob to g higher range.
②. Max input current is 200mA or 20A (subject to where the red test insert
to), too large current will damage the fuse.
4-5. ACA Measurement
1. Insert the black test lead into the jack and the red one into the “COM” “mA”
jack (the Max 200mA) or to (the Max 20A).“20A”
2. Selectt the knob to a proper ACA range, and connect the leads crossly to
the electric circuit under test.
NOTE:
①. Firstly users should set the knob to the highest range, if users had no
idea about the range of current under test, and then select the proper
range based on displaying value.If the LCD displays it means the “1”
current is over range. thus should select the knob to g higher range..
②. Max input current is 200mA or 20A (subject to where the red test lead
insert to), too large current will damage the fuse.
4-6. Resistance Measurement
1. Insert the black test lead into the jack and the red one into the “COM”
“ ”jack.
2. Set the knob to a proper resistance range, and connect the test leads
crossly to the resistor under test.
NOTE:
①. The LCD displas while the resistance is over the selected “1”
range. The knob should be adjusted to higher range. When
measuring value is over 1MΩ, the reading will take a few seconds
to be stable. It is normal for high resistance measuring.
②. When input terminal is in open circuit, overload displays.
③. When measuring in line resistor, be sure that the power is off
and all capacitors are released completely.
④. Do not input any voltage at resistance range. even the meter
has voltage protection functions at this range!
4-7. Capacitance Measurement
1. Set the knob to proper capacitance range, and insert the measuring
accessories or test leads into and jack.“COM” “mA”
terminal is for positive pole “COM” “ ”
terminal is “mA”
2. Connect test leads with the two points of capacitor, be wary of
polarity if necessary.
NOTE:
①. If the capacitance under tested is over the max, value of selected
range, LCD displays thus should set the knob to a higher “1”
range.
②. It is norminal that there is a remained value on LCD before capa-
citance measurement, and it doesn't affect the measurement.
③. When measuring at large capacitance range, if capacitor is crept
bably or broken, LCD displays some unstable value.
④. Release the capacitor completely before measuring capacitance.
⑤. Unit: 1uF=1000pF,1nF=1000pF
4-8. Diode and Continuity performance test
1.Insert the black test lead into the jack and the red one into“COM”
the “ ”jack (the polarity of red lead is “＋”
2. Set the knob fo " "range.
3. Forward test: the red test lead connect to the positive of the tested
the red test lead connect to diode positive polarity and black test
lead connect to diode cathode polarity ,the reading is the approx
Value of diode forward volt drop.
4. Reverse test: connect test leads with the diode under tested,the red
test lead connect to diode cathode polarity, and the black test lead
connect to diode posotive polarity, ill be displayed on LCD.“1”w
5. Insert test leads to two points of tested circuit, if the inner buzzer
sounds and turn on light, the resistance is less than (70±20)Ω.

4-9. Frequency Measurement
1.
Insert the red or shield cable in to the jack and the black “COM”
one in to the “ ”jack.
2. Set the knob to frequency range, connect test leads or shielded
cable crossly to the signal source or the lead which is test.
NOTE:
①. The meter can still work if the input value is higher than 10V
effective, but the accruacy is not guaranteed.
②. It noise environment, you did better use shield cable to
measure a low signal.
③. when measuring high voltage circuit. Don't touch the high
voltage circuit.
④. Don't input voltage higher than 250V DC ro AC effective value
or it may damage the meter.
4-10. Temperature Measurement
Select the knob to the “℃” range, i insert the cathode (black pin) of
cold end (free end) of thermocouple into jack,anode (red pin) into“mA”
“COM”jack, put the working end (temperature measruement port) of
thermocouple on the surface or inside the object to be tested. Then you
can read temperature from the screen, and the data is in Centigrade. If
using the testing accessory, please insert testing accessory int “COM”
and for anode and for cathode.“mA” “COM” “mA”
4-11. Date Hold
Press the Hold switch, the pressently measrue value is held on
LCD,press it again and the function is cancelled.
4-12. Auto power off
The meter will be into sleeping mode when it is out of work for (20
±0) minutes. press key twice to restart the power.“POWER”
4-13. Backlight
Press key to turn on the backlight, and it will turn off after 5 “ ”
seconds.
NOTE:
When turning on backlight, the working current will be enlarged, it
leads to shorten battery usage and enlarge accuracy error of some
functions.
5. MAINTENANCE
Do not try to modify the electric circuit.
1. Keep the meter away from water, dust and shock.
2. Do not store and operate the meter under the condition of high tem-
perature, high humidity, combustible, explosive and strong magnetic
place.
3. Wipe the case with a damp cloth and detergent, do not use abrasiv-
es and alcohol.
4. If do not operate for a long time, should take out the battery to avoid
leakage.
A. When signal displays, should replace the battery following“ ”
the steps.
B. Fuse change: When replacing fuse, please change another same
type and specification fuse.
a
.Unlock the button and remove the battery case.
b. Take out the old battery and replace the new one. It is better to
use alkaline battery for longer life.
c. Fit on the battery case and lock the button.
6. If the meter does not work properly,check the meter as following:
Conditions Way to solve
No reading on LCD
Turn on the power
Set the HOLD key to a correct mode
Replace battery
Replace battery
Replace fuse
Replace battery
signal appears
No current or temperature input
Big error Value
The specifications are subject to change without notice.
The content of this manual is regarded as correct, error or
omits Pls. Contact with factory.
We hereby will not be responsible for the accident and
damage caused by improper operation.
The function stated for this User Manual cannot be the
reason of special usage.
910
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Metravi 23Smkll
DIGITAL MULTIMETER
OPERATION MANUAL
23Smkll