Hongda USA DT95B User manual
OPERATOR’S INSTRUCTION MANUAL
MINI 3 1/2 DIGITAL MULTIMETER DT95B
1. INTERNATIONAL SYMBOLS
AC
DC
Diode
Continuity
Ground
Double Insulation
Warning
2. Feature
Display: 3 1/2 digit LCD. Largest number 1999
Polarity: Automatic polarity display
Outrange: Upper most display“1”
Working Ambient Temperature: 0-40
Relative Moisture:
＜
75%
Storaging Ambient Temperature: -15-50
Battery: 12V(A23M)
Dimensions: 100*59*22(mm)
Weight: 80g(with battery)
3. Technical Specifications
Requirements for accurate performance guarantee of the instrument:
Temperature 23
±
50
Moisture
＜
75%Rh
Accuracy: (% reading + word number)
3.1 DC Voltage
Range Resolution Accuracy
200mV 100µV
2000mV 1mV
20V 10mV
200V 100mV
400V 1V
±（
0.8%+2
）
Input impedance: 1MΩ
Max input voltage: 400V DC or effective value AC
3.2 DC Current
Range Resolution Accuracy
2000µA 1µA
20mA 10µA
±（
1%+2
）
200mA 100µA
±（
1.2%+2
）
Overload protection: fast 0.2A/250V fuse
3.3 AC Voltage
Range Resolution Accuracy
200V 100mV
400V 1V
±（
1.5%+10
）
Frequency Response: 40-200Hz
Max input voltage: 400V effective value AC
Displayed: Sine wave effective value, average value response
3.4 Resistance
Range Resolution Accuracy
200Ω0.1Ω
2000Ω1Ω
20KΩ10Ω
±（
1.0%+2
）
200KΩ100Ω
2000KΩ1KΩ
Max open circuit voltage: 2.8V
Overload protection: 250V DC or effective value AC less than 10 seconds
3.5 Battery measurement (9V)
Voltage of 9V battery under certain load is displayed to reveal the load-carrying ability of
the battery. The result by this method is more quotable than that obtained by overload
voltage measurement.
Overload protection: fuse 0.2A/250V
3.6 Diode and Buzzer.
For diode: measuring voltage: approx 2.7V. Current: 0.8mA. Approximation of positive
voltage drop on diode is displayed.
For buzzer: the built-in buzzer will sound when the resistance is less than 30Ω.
4. Measurement Instrument
4.1 DC voltage measurement (DCV)
A. Set the rotary switch at V
(DCV) position with proper range. The upper most range
position shall be selected when it is not for sure.
B. Connect the red and black test leads to the circuit being measured.
4.2 DC current measurement (DCA)
A. Set the rotary switch at the A
(DCA) position with proper range.
B. Connect the red and black test leads to the circuit being measured in series.
4.3. AC voltage measurement (ACV)
A. Set the rotary switch at V (ACV) position with proper range.
B. Connect the red and black test leads to the circuit being measured.
4.4. Resistance measurement (Ω)
A. Set the rotary switch at Ωposition with the proper range.
B. Connect the red and black test leads to the two ends of the resistance being measured.
C. Power shall be turned off and all the capacitors can be discharged when measuring
resistance in circuit.
4.5. Battery measurement (9V)
A. Set the rotary switch at “9V” position.
B. Connect the red and black test leads to the two polars of the battery being measured.
4.7. Diode and make-break measurement
A. Set the rotary switch at “ ” position.
B. Approximation of diode voltage drop is displayed on LCD when the diode is measured
forwardly. While “1” is displayed when measured reversely.
C. Connect the red and black test leads to two ends of the circuit. When the resistance
value between the two ends is less than 30Ω, the buzzer will sound and the value is
displayed.
5. Cautions
5.1. Never surpass the max input limit.
5.2. To prevent electric shocks, touching of high voltage circuit being measured must be
avoided.
5.3. When the measurement error is larger than normal tolerance, the reason might be low
battery voltage, and the battery shall be changed (12V/A23M).
5.4. Incase there is no response when measuring current or inputting 9V battery signal the
fuse shall be checked. The damaged fuse shall be replaced by that of identical type
(0.2A/250V).
5.5. The back cover must be mounted on and fixed correctly before using the instrument.
