TECPEL DMM-8007A User manual

DIGITAL MULTIMETER
OPERATION MANUAL
1. GENERAL
The instrument is a stable and good performance digital multimeter driven by battery.
It uses the LCD with 42mm-high figure to make the reading clear. Unit symbol
displaying, backlight and the function of overload protection make operation is
convenient.
The instrument has the function of measuring DCV, ACV, DCA, ACA, resistance,
capacitance, inductance, temperature and frequency, and diode, triode and
continuity test. The instrument takes dual-integral A/D converter as key point, is an
excellent tool.
2. SAFETY NOTES
This series meter meets the standard of IEC1010. Please read below notes
carefully before operation.
1．Do not input a limited voltage which RMS is over DC 1000V or AC 700V when
measuring voltage.
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 point when converting function and
range.
4．Select correct function and range to avoid fault operation.
5．When measuring current, do not input current over 20A.
6．Safety symbols
“” exists high voltage，“”GND，“” dual insulation，“” must refer to manual，
“” low battery
3. SPECIFICATION
1) GENERAL
1-1．Displaying : LCD displaying
1-2．Max. indication: 1999（3 1/2）, auto polarity indication
1-3．Measuring method: dual slope A/D transfer
1-4．Sampling rate: approx. 3 times/sec
1-5．Over range indication: MSD displays “OL”
1-6．Low battery indication: “ ” symbol displays
1-7．Operation: 0～40℃，relative humidity <80%
1-8．Power：one 9V battery (NEDA1604/6F22 or equivalent）
1-9．Size: 190×88.5×27.5 mm
1-10．Weight: approx.422g (including 9V battery)
2) TECHNICAL DATA
2-1．Accuracy: ±（a% × reading + dgts） at (23 ± 5)℃, relative humidity<75%. One
year guarantee since production date.
2-2. Function:
·DCV ·Resistance Ω ·Temperature ℃
·ACV ·Diode continuity testing ·Frequency f
·DCA ·Triode h
FE ·Inductance L
·ACA ·Capacitance C ·Auto power-off
·True RMS · Backlight
2-3. TECHNICAL DATA
2-3-1. DC Voltage
Input resistance：All range is 10MΩ
Overload protection：Range 200mV: DC 250V or AC peak value
Other ranges: DC 1000V or AC peak value
2-3-2. AC Voltage
Input impedance：All range is 10MΩ；
The frequency response of the standard sine wave and triangular wave is 40Hz
~1kHz.
The frequency response of other waves is 40Hz ~200Hz
2-3-3. DCA
Max. measuring voltage drop: 200mV；
Max. input current: 20A (within 10 seconds)
Overload protection: 0.2A / 250V fuse ;20A/250V fast-melt fused.
2-3-4. ACA
Range Accuracy Resolution
200μA
±(0.8%+10)
0.1μA
2mA 0.001mA
20mA 0.01mA
200mA 0.1A
20A ±(2.0%+5) 0.01A
Max. measuring voltage drop: 200mV
Max. input current: 20A (within 10 second）
Overload protection：0.2A / 250V fuse ;20A/250V fast-melt fused.
Frequency response：sine and triangular wave: 40Hz~1kHz
Other wave: 40Hz~200Hz
Displaying: True RMS
2-3-5. Resistance（Ω）
Range Accuracy Resolution
200Ω ± (0.8%+5) 0.1Ω
2kΩ
± (0.8%+3)
1Ω
20kΩ 10Ω
200kΩ 100Ω
2MΩ 1kΩ
20MΩ ± (1.0%+25) 10kΩ
200MΩ ± (5.0% + 30) 100kΩ
Open voltage：less than 3V
Overload protection：DC 250V or AC peak value
NOTE: A：At range 200 Ω, short-circuit the test leads to measure the wire
resistance, then, subtracts it from the real measurement.
B：The reading be displayed slowly when the measurement is more than 1 MΩ.
Please wait it to be stable.
2-3-6. Capacitance
Range Accuracy Resolution
20nF
±(3.5%+20)
10pF
200nF 100pF
2uF 1nF
20uF 10nF
200uF ±(5.0%+10) 100nF
2mF 1uF
Overload protection：DC 250V or AC peak value
2-3-7. Inductance (L)
Range Accuracy Resolution
2mH
±(2.5%+30)
1uH
20mH 10uH
200mH 100uH
2H 1mH
20H 10mH
Overload protection：DC 36V
DO NOT INPUT VOLTAGE AT THIS RANGE
2-3-8. Temperature
Range Accuracy Resolution
(-20 ~ 1000)℃ ±(1.0%+5) < 400℃
±(1.5%+15) ≥ 400℃ 1℃
(0~1832)°F ±(0.75%+5) < 750°F
±(1.5%+15) ≥ 750°F 1°F
2-3-9. Frequency
Range Accuracy Resolution
10Hz
±(0.1%+3)
0.01Hz
100Hz 0.1Hz
1kHz 1Hz
10kHz 10Hz
100kHz 100Hz
1MHz/20MHz 1kHz/10kHz
Input sensitivity：1V RMS
Overload protection：DC 250V or AC peak value (within 10 seconds)。
2-3-10. Diode and continuity testing
Range Reading Condition
Forward voltage drop of diode
Forward DCA is approx.
1mA, the backward
voltage is approx 3V
Buzzer makes a long sound
while resistance is less than
70Ω±20Ω
Open voltage is approx.
3V
Overload protection：DC 250V or AC peak value
Range Accuracy Resolution
200mV
±(0.5%+3)
0.1mV
2V 0.001V
20V 0.01V
200V 0.1V
1000V ±(0.8%+10) 1V
Range Accuracy Resolution
200mV
±(0.8%+5)
0.1mV
2V 1mV
20V 10mV
200V 100mV
750V ±(1.2%+10) 1V
Range Accuracy Resolution
200μA
±(0.8%+10)
0.1μA
2mA 0.001mA
20mA 0.01mA
200mA 0.1A
20A ±(2.0%+5) 0.01A
TECPEL

CAUTION：DO NOT INPUT VOLTAGE AT THIS RANGE!
2-3-11. Transistor hFE DATA TEST
Range Displaying range Test condition
hFE NPN or PNP 0 ~ 1000β Basic current is approx.
10uA ， Vce is about 3V
4. OPERATION
4-1．Panel description
1. LCD: display the measuring value and unit.
2. Press “REL/MAX/MIN”, then you can test the
relative magnitude. If you hold the “REL/MAX/MIN”
for more than 2s, you can test the Max and Min
value.
3. Transistor input jack
4. Backlight and function key; Diode/buzzer and
frequency range, when press ”HOLD/B/L”, you can
do the function change; When under other range, this
is the hold key; press “HOLD/B/L” key for more than
2s, the backlight will on/off.
5. Power on/off
6. Switch: change the function or the range.
7. 200mA current and inductance input jack
8. 20A/2A current test jack
9. Inductance, temperature, “-“common input jack
10. Voltage, resistance, diode, capacitance, frequency, temperature, “+” input jack.
SEE THE FIG.
4-2．Voltage measurement
1. Apply the black test lead to “COM” terminal and the red one to “V/Ω/Hz” terminal.
2. Setup the Knob on a proper range “V”. If the voltage range is unsure beforehand,
please set it on the max., then measure diminishingly to reach a resolute value.
3. Press the DC/AC key down to AC mode to measure AC voltage. Oppositely,
resile the key to DC mode to measure DC voltage.
4. Connecting the test leads reliably with the tested circuit, the voltage value will be
displayed on LCD. While testing a DC voltage, the reading is voltage and polarity of
the point connected by the red lead.
NOTE:
1. While the reading is “OL”，the voltage is beyond the present range. Now you need
to set the knob to the higher.
2. Do not input a voltage over DC 1000V or AC 750V. Please keep the test leads off
the circuit while switching the function or range, or after finished your testing.
3. Be carefully while measuring a high voltage. DO NOT touch the circuit.
4-3．Current measurement
1. Apply the black test lead to “COM” terminal and the red one to “mA” (Max 200mA)
or “20A”(Max 20A) terminal.
2. Set the knob to a proper range “A”. If the current under tested is unsure
beforehand, please set it on the max., then measure diminishingly to reach a
resolute value.
3. Press the DC/AC key down to AC mode to measure AC current. Oppositely,
resiling the key to DC mode to measure DC current.
4. Connecting the leads with the tested circuit in series, the current value is
displayed on LCD. While testing a DC current, the reading is the value of current
and polarity of the point connected by the red lead.
NOTE:
1．If the LCD displays “OL”，it means the current is over range. Now you need to set
the knob to the higher.
2．Max. input current is 200mA or 20A（subject to where the red test lead apply to）,
too large current will blow the fuse. Be sure the test is less than 10 seconds when
test 20A current. Please keep the leads off the circuit while switching the function
and range knob.
3. Do not input more than DC 36V, AC 25V between the current jack and “COM”
jack.
4-4．RESISTANCE MEASUREMENT
1. Apply the black lest lead to “COM” terminal and the red one to “V/Ω/Hz” terminal.
2. Set the knob to a proper resistance range, and connect the leads crossly with the
resistor under tested.
NOTE:
1. The LCD displays “OL” while the resistance is over the selected range. The knob
should be adjusted to a higher range.
2. When test low resistance, test leads will bring internal resistance, in order to get a
accurate readings, you can mark the short circuit value of the test leads, then
subtract it from the value of the low resistance.
3. When measuring in line resistor, be sure that the power is off and all capacitors
are released completely.
4. Do not input any volt at resistance range.
5. When measuring value is over 1MΩ, the reading will take a few seconds to be
stable. It’s normal for high resistance measuring.
4-5．CAPACITANCE MEASUREMENT
Apply the knob to proper capacitance range, and insert the capacitor under tested
into “V/Ω/Hz” and “COM” terminal, be wary of polarity if necessary.
NOTE:
1. If the capacitance under tested is over the max. value of selected range, LCD
displays “OL”, thus, should set the knob to a higher range.
2. It’s normal that there is a remained value on LCD before capacitance
measurement when at the range 20nF and you can subtract it from the value.
3. When measuring at large capacitance range, if capacitor is crept badly or broken,
LCD displays a value and it’s unstable.
4. Release the capacitor completely before measuring.
4-6．INDUCTANCE MEASUREMENT
Set the knob to a proper inductance range and insert the inductor to “mA” and
“COM” terminal.
NOTE:
1. The LCD displays “OL” while the tested inductance is over the selected range.
Thus, the knob should be set to a higher range.
2. Range “mH” is auto change of 2mH/20mH/200mH, and range “H” is the auto
range of 2H/20H.
3. Do not input voltage at this range.
4-7. FREQUENCY MEASUREMENT
1. Apply test leads or shield cable to “COM” and “V/Ω/Hz” terminal.
2. Set the knob to frequency range, connect test leads or cable crossly to signal
source or tested load.
NOTE:
1. When input over 10V RMS, reading is workable but accuracy is not guaranteed.
2. It is better to use shield cable to measure small signal at noisy environment.
3. Be careful when measuring high volt circuit.
4. Do not input voltage over DC 250V or AC peak value.
4-8. TRANSISTOR hFE
1. Set the knob to “hFE” range.
2. Verify the transistor under tested is NPN or PNP, insert emitter, base and
collector to proper jack.
4-9. DIODE AND CONTINUITY TEST
1. Apply the black test lead to “COM” terminal and the red one to “V/Ω/Hz” terminal
(the polarity of red lead is “+”）.
2. Set the knob to range, connect test leads to the diode under tested, the
red test connect to diode positive polarity, the reading is the approx. value of diode
forward volt drop.
3. Apply test leads to two points of tested circuit, if the inner buzzer sounds, the
resistance is less than (50 ± 20) Ω.
NOTE: Do not input voltage at this function.
4-10．DATA HOLD/ BACKLIGHT
Except Diode, Buzzer and Frequency function, at all other functions, if you press
“HOLD B/L”, it will show “HOLD” symbol on the display, and the present value will
be keep on it too, and if you press the key again, the symbol will disappear. If you
press the key for more than 2s, it will be the backlight on/off.
4-11．AUTO POWER OFF
After stop working for 15 minutes, the meter will be into sleep mode. Press
“POWER” key can back to work.
Press “REL/MAX/MIN” key and at the same time press the “POWER” the “APO”
symbol will disappear, now you already closed the function of auto power off.
5．MAINTENANCE
Do not try to modify the electric circuit.
5-1. Keep the meter away from water, dust and shock.
5-2. Do not store and operate the meter under the condition of high temperature,
high humidity, combustible, explosive and strong magnetic place.
5-3. Wipe the case with a damp cloth and detergent, do not use abrasives and
alcohol.
5-4. If do not operate for a long time, should take out the battery to avoid leakage
When signal displays, should replace the battery following the steps
5-4-1 Unlock the button and remove the battery case.
5-4-2 Take out the old battery and replace the new one. It’s better to use alkaline
battery for longer life.
5-4-3 Fit on the battery case, lock the button and put on the holster.
5-5 Replace fuse ：When replacing fuce, please use another same type and
specification fuse.
6. If the meter does not work properly, check the meter as following:
Fault Solution
No reading on LCD
●Power off--- Pls turn on the power
●Holding key---PLs set a correct mode
●Replace battery
The signal appears ●Replace battery
No current or temperature input ●Replace fuse
Error Value ●Replace battery
601E-9805-002A
TECPEL