The instrument is a stable digital multimeter driven by battery. It comes with
20mm high LCD to make reading more clear. Backlight display and overload
protection make it convenient to use .This instrument features multi functions
for measuring DCV, ACV, DCA,ACA, resistance, capacitance, diode,
continuity and frequency., The instrument utilizes a dual-integral A/D
converter as a key feature and is an excellent tool. It is portable and Ideal for
lab, factory and field use.
AFETY NOTE
S
The meter meets the standards of IEC1010.
Please read the operation manual carefully before operation.
1. Do not input anything over a range limit.
2. Voltage below 36V is safe. To avoid electric shock, check whether the test
leads are connected correctly, whether the insulation is good when
measuring over 36DCV or 25ACV.
3. Remove the test leads when changing function and range.
4. To select correct function and range, make sure the range limit setting is
correct. Start with higher limits and work down to correct level if
uncertain.
5. Do not operate the meter if battery case and back cover is not properly
fixed.
6. Do not input voltage when measuring resistance.
7. Remove test leads from test point and turn off the power before replacing
1.11 Accessories: operation manual, holster, test leads.
”DANGEROUS VOLTAGE EXISTS,
” GND,“ ”DUAL INSULATION
”THE OPERATOR MUST REFER TO THE MANUAL ,
”LOW BATTERY
” appears.
1.5V AAA×2pcs
1
Page 3
2 TECHNICAL CHARACTERISTIC
2.1 Accuracy:±(a%× rdg+d) at (23±5)℃,R.H.<75%,one year guaranteed
from the production date.
2.2 TECHNICAL DATA
2.2.1 DCV
RANGE ACCURACY RESOLUTION
200mV 100uV
2V 1mV
20V 10mV
200V
600V ±(1.0%+10) 1V
Input resistance: All ranges: 10 MΩ
Overload protection: 250V DV or AC peak value at 200mV range.
600V DC or AC peak value at other ranges.
2.2.2 ACV True RMS measurement
Range
40Hz-200Hz 200Hz-1kHz
2v 1mV
±(0.8%+5)
200v
600V ±(1.2%+10)
Input impedance:All ranges 10MΩ
Overload protection:250V DC or AC peak value at 200mV ,
600V DC or AC peak value at other ranges.
Frequency response: 40Hz-1kHz
Display: True RMS
2.2.3 DCA
RANGE ACCURACYRESOLUTION
20mA 10uA
200mA
10A ±(2.0%+5) 10mA
Max. input volt drop: 200mV;
Max. input current: 10A(the test time should be within 10
seconds)
Overload protection: 0.2A/250V fast-blow fuse, no protection at
10A.
±(0.5%+3)
Accuracy
±(0.8%+5) sine
and triangular
wave
±(1.2%+10)
sine and triangular
wave
±(1.2%+8)
2
100mV
±(8.0%+15)
other wave
100uA
Resolution
100mV
1V
Page 4
2.2.4 ACA True RMS measurement
Range
40Hz-200Hz 200Hz-1kHz
Accuracy
±(1.5%+15)
200mA ±(1.5%+15)
10A ±(3.0%+10)
sine and
triangular wave
±(3.0%+10)
sine and
±(8.0%+15)
other wave
triangular wave
Max. measuring voltage drop:200mV.
Max. input current: 10A (less than 10 seconds).
Overload protection: 0.2A/250V fuse;no protection at 10A.
Frequency response: 40Hz-1kHz.
Display:True RMS
2.2.5
RESISTANCE(Ω)
RANGE ACCURACY RESOLUTION
200Ω±(0.8%+5)0.1Ω
20kΩ10Ω
200kΩ
±(0.8%+3)
20MΩ±(1.0%+25)10kΩ
Open voltage: less than 3V.
Overload protection: 250V DC or AC peak value.
NOTE:
t 200Ω range, the test leads should be short-circuited,
1. A
measure
the lead to lead resistance, then, subtract from the real
measurement.
2.
It is normal for reading to be slow when measured va
above 1MΩ, please read it after the display value stabilizes.
2.6 CAPACITANCE (C)
2.
RANGE ACCURACYRESOLUTION
20nF 10pF
200nF 100pF
±(3.5%+20)
2uF
20uF 10nF
200uF 100nF
±(5.0%+10)
2000uF
Overload protection: 250V DC or AC peak value
NOTE: when over range, it can keep on measuring, "OL" will not
show on LCD and the value is for reference only
2.2.7 FREQUENCY
3
Resolution
100uA
10mA
100Ω
and
lue is
1nF
1uF
Page 5
RANGE ACCURAC
10Hz 0.001Hz
100Hz 0.01Hz
1kHz 0.1Hz
10kHz 1Hz
100kHz 10Hz
2MHz
Input sensivity:1V RMS , overload protection : 250V DC or AC
peak value(less than 15 seconds)
NOTE: when over range, it can keep on measuring, "OL" will not
2.2.8 DIODE AND CONTINUITY TEST
RangeDisplaying value Test condition
Overload protection: 250V DC or AC peak value
Warning: DO NOT input any voltage at this range for safety!
3 OPERATION
Front panel description
3.1
3.1.1 LCD: display the measured value.
3.1.2
Power/auto power off key: turn on/off
the power and auto power off.
3.1.3 Hold/backlight/function selecting key:
turn on/off hold and backlight key.
3.1.4 Range knob: selecting measuring
function and range .
3.1.5 GND.
3.1.6 10A current test jack.
3.1.7 “+” pole jack of voltage 、resistance、
diode、capacitance and resistance.
3.2 VOLTAGE MEASUREMENT
3.2.1 Insert the black test lead to “COM” jack, the red one to V/Ω/Hz
jack.
3.2.2 Set the range knob to a proper DCV/ACV range, If the measured
±(1.0%+10)
show on LCD and the value is for reference only
Positive voltage
drop of diode
Buzzer sounds ,
the resistance is
less than(50±20)Ω
YRESOLUTION
100Hz
The positive DC
current is approx.
1mA,negative voltage
is approx. 3V
open voltage is approx.
3V
4
Page 6
voltage is unsure beforehand, set the range knob to the highest
range, then reduce it gradually until get the highest resolution
readings.
3.2.3 Apply the test leads to the test point ,the LCD displays the
measured voltage value.
NOTE:
a.If LCD displays “OL”, it means over range, set the range knob to a
higher range.
b.Do not input a voltage over 600V DCA or 600V ACV, the test lead
be off the test point when switching the function and range.
should
c.Do not touch a high voltage circuit when measuring high voltage .
3.3 CURRENT MEASUREMENT
3.3.1 Insert the black test lead into “COM” jack, the red one to “mA” or
“10A”jack.
3.3.2 Set the range knob to a proper DC or AC mA/A range, If the
measured voltage is unsure beforehand, set the range knob to the
highest range, then reduce it gradually until get the highest
resolution readings.
3.3.3 Connect the test leads to the circuit under test, the LCD displays
the measured voltage value.
NOTE:
a.If LCD displays “OL”, it means over range, set the range knob to a
higher range.
b.When measuring current, mA hole should not exceed 200mA,10A
hole should not exceed 10A(test time should be less than 10 sec.)
3.4 RESISTANCE MEASUREMENT
3.4.1 Insert the black test lead to “COM” jack and the red one to
“V/Ω/Hz” jack.
3.4.2 Set the range knob to a proper resistance range, connect the test
leads across to the resistance being measured.
NOTE:
a.If the resistance value being measured exceeds the max value of
the range selected, LCD displays "OL", , set the range
higher
range. When the resistance is over 1MΩ, the meter may take
a few seconds to stabilize. This is normal for high resistance
readings.
b. When input terminal is in open circuit, overload displays.
c.When measuring in-line resistance, be sure that power is off and
cap
acitors are discharged completely.
d.Do not input any voltage at this range.
knob to a
s
all
5
Page 7
3.
5 CAPACITANCE MEASUREMENT
3.5.1 .Insert the red test lead to “V/Ω/Hz” terminal and the black one to
“COM” jack.
3.5.2 Set the range knob to a proper capacitance range, connect the test
leads to the capacitor being measured(note: the polarity of red test
lead is “+”).
NOTE:
a. If the resistance value being measured exceeds the max value of
the range selected, LCD displays "OL".
b. Before measuring, LCD display might not be zero, the residual
reading will decrease gradually and should be disregarded.
c. When measuring large capacitance, LCD may display an unstable
value due to creepage or breaking.
d. Discharge all capacitors completely before capacitance
measurement to avoid damage.
e. Do not input any volt at this range.
f. This range is for automatic range test, measuring the range from
10nF to 2000uF.
g. UNIT: 1mF=1000uF 1uF =1000nF 1nF=1000pF
3.6 FREQUENCY MEASUREMENT
3.6.1 Apply the test lead or shield to cable to “COM” or ““V/Ω/Hz”
terminal.
3.6.2 Switch the knob to frequency range, and connect the test leads
across the signal source or the measured load.
NOTE:
a. When input is 10Vrms or less, a reading is possible but maybe
over-range.
b. Shielded cable is recommended when measuring small signals
under noisy conditions.
c. Be careful when measuring high volt circuit.
d. Do not input a voltage over DC 250V or AC peak factor to avoid
damage to the meter.
e. This range is for automatic range test, Measuring the range from
3.7 DIODE AND CONTINUITY TEST
10Hz to 2MHz
3.7.1 Insert the black test lead to “COM” terminal and the red one to
“V/Ω/Hz” jack( Note: the polarity of red test lead is“+”).
3.7.2 Set the range knob to“
diode being measured, reading is the approximation of the diode
positive volt drop.
3.7.3 Connect the test leads to two points of the measured circuit, if
buzzer sounds, the resistance is lower than approx.(50±20)Ω.
”range, connect the test leads to the
6
Page 8
3.
8 DATA HOLD
Press the “HOLD/BL”, LCD displays “HOLD”, the present value is held on
LCD, press it again, the function is cancelled.
3.9 AUTO POWER-OFF
After not working about 15minutes, the meter will be changed to sleep
mode. Press “POWER APO” key for 2 seconds to restart the power. Press
the “POWER APO” key for 2 seconds to cancel the function of auto power
off and “APO” icon will disappear from LCD; press it again for 2 seconds
to restart the auto power off function and “APO” appears on LCD.
3.10 POWER ON/OFF
Press “POWER APO” key for 2 seconds to turn on the power and the
meter is in working mode, Press “POWER APO” key again to turn it off.
3.11 BACKLIGHT INDICATION
Press “POWER BL” key to turn on the backlight; press it again to turn off.
If the meter stops working more than 15sec, the backlight will auto power
off.
4 MAINTENANCE
DO NOT tamper with the circuit it’s a precision meter and should only be
serviced by factory personnel.
4.1 Do not operate or store the instrument in high temperature or high
humidity place and do not work closed to flammability substance or
explosive or strong magnetic field.
4.2 Use the damp cloth and soft solvent to clean the meter, do not use
abrasive and alcohol.
4.3 If not operated for a long time, take out the battery.
4.3.1 When LCD displays “
4.3.1.1 Take out of the holster and drop out the battery case.
4.3.1.2 Take out the battery and replace a new one. It’s better to
use alkaline battery for long time use.
4.3.1.3 Fix the battery case and replace the holster.
4.3.2 Replacing fuse
5 TROUBLE SHOOTING
If the meter does not work properly, check the meter as follows:
Please use the same type and specification fuse as replacement.
CONDITIONS WAY TO SOLVE
NO DISPLAYING
symbol displays ●Replace battery
NO CURRENT INPUT ●Replace fuse
BIG ERROR ●Replace battery
” symbol, replace the battery as below:
●Power is off
●Replace battery
7
Page 9
MT-1705
3-1/2 真有效值數位電錶使用手冊
一. 產品概述
MT- 1705 3-1/2 真有效直自動換檔電錶是一台性能穩定、可靠性高的電池驅動數
位萬用電錶。它採用了 20mm 字高的 LCD 顯示器,擁有背光顯示及超載保護功能,
更方便使用者操作。
該儀器具有測量 DCV、ACV、DCA、ACA、電阻、電容、頻率、二極體和通斷測
試的功能,採用雙積分 A / D 轉換的核心處理器,是一台性能優越的工具儀錶,適
合在實驗室、工廠、家庭使用者的理想工具。
二. 安全注意
該儀錶的設計符合 IEC1010 標準。
操作之前,請先閱讀安全注意事項。
1. 測量電壓時,請勿輸入超過直流或交流 600V 電壓。
2. 電壓低於 36V 為安全電壓,當測量電壓高於 36V DC/25V AC,請檢查連接
3. 改變功能和測量範圍時,測試錶棒應離開測試點。
4. 謹防誤操作,選擇正確的功能和量程,該電錶雖然有全量程保護功能,但為
5. 安全符號
三. 技術指標
事項
測試錶棒是否可靠接觸、正確連接、絕緣良好,以避免觸電。
了安全起見,請你多加注意。
“
”存在危險電壓, “ ”接地“” “雙絕緣
“
”必須參照說明書“ “”電池電量低
1. 一般規格
顯示方式:液晶屏顯示
最大顯示:1999(3 1 /2),自動極性指示
測量方法:雙斜率積分 A / D 轉換器
採樣速率:約 3 次/秒
超量程顯示:最高位顯示
電池電量
工作環境:溫度(0~ 40)℃,濕度< 80%
低:“
“OL”
”
RH
8
Page 10
電源:1.5V AAA x2 個
尺寸:150 毫米× 75 毫米× 35 毫米 (長 x 寬 x 高)
重量:大約 170 克(不包括電池)
配件:使用說明書,測試錶棒