Victor VR-9807A User manual

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DIGITAL MULTIMETER
OPERATION MANUAL
VR-9807A
1. GENERAL
The instrument is a stable and good performance
digital multi-meter driven by battery. Its LCD with
42mm-high figure makes the reading clear. Overload
protection makes the operation is convenient.
The instrument has the function of measuring DCV,
ACV, DCA, ACA, resistance, capacitance, frequency,
and diode, triode and continuity test. The instrument
takes dual-integral A/D converter as key point, is an
excellent tool.

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2. SAFETY NOTES
The meter meets the standard of IEC1010. Please read
below notes carefully before operation.
2-1 Do not input the limited voltage of 1000V DC or
700V AC TRUE RMS when measuring voltage.
2-2 Voltage less than 36V is a safety voltage. When
measuring voltage higher than DC 36V, AC 25V,
please check the connection and insulation of test
leads to avoid electric shock.
2-3 Be sure to keep the test leads off the testing point
when converting function and range
2-4 Select correct function and range to avoid fault
operation.
2-5 Do not input a current over 20A.
2-6 Safety symbols

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“ ” exists high voltage，“”GND，“ ” dual
insulation，
“ ” must refer to manual，“ ”low battery
3. SPECIFICATION
3-1．GENERAL
3-1-1．Displaying : LCD displaying
3-1-2．Max. indication: 19999（4 1/2）, auto polarity
indication
3-1-3．Measuring method: dual slope A/D transfer
3-1-4．Sampling rate: approx. 3 times/sec
3-1-5．Over range indication: MSD displays “OL”
or”-OL”
3-1-6．Low battery indication: “ ” symbol displays
3-1-7．Operation environment: (0～40)℃，relative

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humidity <80%
3-1-8．Power: one 9V battery (NEDA1604/6F22 or
equivalent)
3-1-9．Meas.:190*88.5*27.5 mm
3-1-10．Weight: approx. 422g（including battery）
3-1-11．Accessories: Operation manual, Test leads,
Shock-proof cover, Gift box, battery etc.
3-2 TECHNICALDATA
3-2-1 Accuracy: ± (a% × reading + digits) at 23 ± 5℃,
relative humidity <75%. One year guarantee since
production date.
3-2-2 Function:
·DCV
·Resistance Ω
Conductance
·ACV
·Diode
continuity
testing
·Frequency f
·DCA
·Triode
hFE
·Unit symbol
display

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·ACA
·Capacitance C
Auto power off
Backlight
display
3-2-3. TECHNICAL DATA
3-2-3-1. DCV
Range
Accuracy
Resolution
200mV
±(0.1%+5)
0.01mV
2V
0.0001V
20V
0.001V
200V
0.01V
1000V
±(0.2%+5)
0.1V
Input impedance:
200mV range: 1MΩ
other ranges :10MΩ ;
Overload protection:
200mV range: DC 250V or AC peak value.
Other ranges: DC 1000V or AC peak value

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3-2-3-2. ACV
Range
Accuracy
Resolution
200mV
±(1.0%+25)
0.1mV
2V
±(0.8%+25)
1mV
20V
10mV
200V
100mV
750V
±(1.2%+25)
1V
Input impedance：
200mV range: 1MΩ
other ranges :10MΩ ;
The frequency response of sine wave and triangular
wave is 40Hz-1kHz; the frequency response of other
waveform is 40Hz-200Hz .
Over-range protection：
200mV range: DC 250V or AC peak value.
Other ranges: DC 1000V or AC peak value

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Displaying：1）True RMS（true value response）
2) It’s normal that Some range do not turn
to “0” and it do not affect the measuring
accuracy
3-2-3-3.DCA
Range
Accuracy
Resolution
200uA
±(0.5%+4)
0.01uA
2mA
0.0001mA
20mA
0.001mA
200mA
±(0.8%+6)
0.01mA
20A
±(2.0%+15)
0.001A
Max. measuring volt drop: 200mV
Max. input current: 20A（within 10 seconds）
Over-range protection:
0.2A/250V fuse on range less than 200mA
20A/250V fast melt fuse on other range.
NOTE :

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20A range: ≤5A , continuous measurement is allowed.
5A~20A : continuous measurement time should be less
than 10 sec. Time interval should be more than 5 min.
3-2-3-4. ACA
Range
Accuracy
Resolution
200mA
±(1.5%+15)
0.1mA
20A
±(2.5%+35)
10mA
Max. measuring volt drop：200mV
Max. input current：20A（within 10 seconds）
Over-range protection：
≤200mA: 0.2A/250V
20A/250V fast melt fuse
Frequency response：(40~200)Hz
Displaying：True RMS
20A range: ≤5A , continuous measurement is allowed.

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5A~20A : continuous measurement time should be less
than 10 sec. Time interval should be more than 5 min.
3-2-3-5. RESISTANCE（Ω）
Range
Accuracy
Resolution
200Ω
±(0.4%+10)
0.01Ω
2kΩ
±(0.4%+5)
0.1Ω
20kΩ
1Ω
200kΩ
10Ω
2MΩ
100Ω
20MΩ
±(1.2%+25)
1kΩ
200MΩ
±(5%+45)
10kΩ
Open voltage：less than 3V
Overload protection：DC 250V or AC peak value.
Note:
At range 200Ω, should make the test leads short, and
measure the resistance of the wire, then, subtract it from
the actual measuring value.

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3-2-3-6. CAPACITANCE
Range
Accuracy
Resolution
20nF/200nF
±(4.0%+50)
1pF/10pF
2uF
100pF
20uF
1nF
200uF
10nF
2000uF
100nF
Overload protection：DC 36V or AC peak value
3-2-3-7. FREQUENCY
Range
Accuracy
Resolution
20Hz
±(0.1%+3)
0.001Hz
200Hz
0.01Hz
2kHz
0.1Hz
20kHz
1Hz
200kHz
10Hz
2MHz
100Hz
Input sensitivity：1.5Vrms.
Overload protection：DC 250V or AC peak value
(within 10sec.)
3-2-2-8.DIODE AND CONTINUITY TEST

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RAN
GE
DISPLAYING
VALUE
TEST
CONDITION
Diode forward volt
drop
Forward DC current
is approx. 1mA，
backward voltage is
approx. 3V
Buzzer rings, the
impedance between
the two testing points
is less than(50±20)Ω
Open voltage is
approx. 3V
Overload protection：DC 250V or AC peak value.
Warning: Do not input any voltage value at this range
for safety!
3-2-2-9. hFE
Range
Scope
Testing condition
hFE NPN or
PNP
（0~1000）
β
Base DC current is
approx. 10uA，Vce is
approx. 3V
3-2-2-10.CONDUCTANCE MEASUREMENT
Range
Accuracy
Resolution
(0.1~100)nS
±
0.1nS

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（1.0%+30
）
4. OPERATION
4-1．Front panel
4-1-1. LCD: display the measured value
4-1-2. Power, press the hold key to
turn it on, auto power-off can
be cancelled.
4-1-3. Hold and turn on /off the
backlight .
4-1-4.Tride input terminal
4-1-5. backlight indicator :press AC+DC to turn it
on/off.
4-1-6. Knob switch: selecting measuring function and

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range.
4-1-7. COM for measuring current 20A/2A.
4-1-8.COM for measuring current 200mA.
4-1-9. GND, capacitance and temperature cathode
COM.
4-1-10.Voltage ,resistance , temperature and diode
anode COM.
4-2．DCV measurement
4-2-1. Apply the black test lead to “COM” terminal and
the red one to “V/Ω/Hz” terminal.
4-2-2. Switch the knob to a proper DCV range, then,
crossly connect the test leads with the measured
circuit, the voltage and polarity of the point
which connected with the red test lead will be

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displayed.
NOTE:
1. If the voltage under measured is unclear beforehand,
should set the range knob to the highest range, then,
switch to a proper range according to the displaying
value.．If LCD displays “OL”，it means over-range,
the range knob must be switched to a higher range.
2. Do not input a voltage over 1000V, or the meter
might be damaged.
3. Be careful when measuring high voltage circuit.
4. Be sure to keep the test leads off the testing point
after complete all the measurement .
4-3．ACV measurement
4-3-1. Apply the black test lead to “COM” terminal and

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the red one to “V/Ω/Hz” terminal.
4-3-2. Set the range knob to a proper ACV range, then,
connect the test leads crossly with the measured
circuit.
NOTE:
1. If the range under measured is unclear beforehand,
should set the range knob to the highest range, then,
switch it to a proper range according to displaying
value.．If LCD displays “OL”, it means over-range,
should set the range knob to a higher range.
2. The remained digits do not affect the measuring
accuracy.
3. Do not input a voltage over 750V, or, the meter might
be damaged.
4. Be careful when measuring high voltage circuit.

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5. Be sure to keep the test leads off the testing point
after complete all the measurement .
4-4. DC current measurement
4-4-1. Apply the black test lead to “COM” terminal and
the red one to “mA” terminal (Max.200mA), or
the red test lead to “20A” terminal (max. 20A)
4-4-2. Set the range knob to a proper DCA current range,
then, connect the meter with the measured circuit,
the measured current value and the polarity of
the point which connected by the red test lead
will be displayed on LCD.
NOTE:
1. If the range under measured is unknown beforehand,
should set the range knob to the highest, then, switch

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it to a proper range according to the displaying value;
If LCD displays“1”，it means over-range, the range
knob must be set to a higher range.
2. The max. input current is 200mA or 20A (subject to
the position where the red test lead be inserted),
large current may blow the fuse. Be careful
especially at 20A range, the testing time should be
less than 10s.Cause there is no fuse protection, large
current may heat the circuit, even damage the meter.
3.Do not parallel connect test lead to any circuit when
test lead insert in current input terminal .It may
damage the fuse and meter.
4. After complete all the measurement, Should turn the
power off then keep the test leads off the testing
point.

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5.Do not input DCV 36V and ACV 25V between
current input terminal and “COM” terminal .
4-5．AC current measurement
4-5-1. Apply the black test lead to "COM” terminal，and
the red one to "mA” terminal (max. 200mA), or
the red test lead to “20A” terminal (max. 20A);
4-5-2. Set the range knob to a proper AC current range,
then, connect the meter with the circuit under
measured.
NOTE:
1. If the current range under measured is unknown
beforehand, should set the range knob to the highest,
then, switch it to the proper range according to the
displaying value. If LCD displays “OL”, it means

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over-range, must set the range knob to a higher
range.
2. The max. input current is 200mA or 20A（subject to
the position where the red test lead be inserted），
large current might blow the fuse ，be careful
especially at 20A range, because there is no fuse
protection, large current may heat the circuit, even
damage the meter.
3. The remained digits do not affect the measuring
accuracy.
4. Do not parallel connect test lead to any circuit when
test lead insert in current input terminal .It may
damage the fuse and meter.
5.. After complete all the measurement ,Should turn
the power off ,then keep the test leads off the testing

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point.
6. Do not input DCV 36V and ACV 25V between
current input terminal and “COM” terminal .
4-6．Resistance measurement
4-6-1. Apply the black test lead to “COM”terminal，and
the red one to “V/Ω/Hz” terminal.
4-6-2. Set the range knob to a proper resistance range,
connect up the test leads across the resistance
under measured.
NOTE:
1. If the resistance value is over the selected range value,
"OL" displays, thus, should set to a higher range.
When measuring value is over 1MΩ，the reading
needs a few seconds to be stable. It's normal for high