Victor VC70D User manual

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Ⅰ. Overview
As a kind of intelligent 3 5/6 digital multimeter with automatic identification, steady performance and high
reliability, this meter is equipped with LCD display device with the text height of 33mm which features
clear reading, direct-viewing display and convenient operation. It can be used to measure DC voltage, AC
voltage, DC current, AC current, resistance, capacitance, frequency, diode and continuity test; meanwhile, it
is available for unit symbol display, data retention, the measurement of maximum and minimum value,
automatic/manual range switching, automatic power off and alarm function. The complete machine takes a
switching integrated circuit which can directly drive LCD microprocessor and double-integrating A/D and a
digital display drive offering high resolution and high precision. Since the meter features complete
functions, high measurement accuracy and convenient operation, it is the ideal tool in laboratory and
factory as well as for radio fans and family.
Ⅱ. Open-package Inspection
Open the package box and take out the meter, check carefully if the following accessories are absent or
damaged. If there is any absence or damage, please contact the distributor immediately.

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Digital multimeter 1 set
InstructionManual 1 copy
Testleads 1 pair
6F22 Battery9V 1 p c
Alligatorclip 1set
Ⅲ. Safety Considerations
In accordance with IEC1010 clause (the safety standard issued by International Electrotechnical Commission),
This product is designed and produced according to the safety requirements of pollution level Ⅱ.
Warning:
In order to avoid endangering the operator’s safety, prior to the operation of the instrument, please read the

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instruction manual carefully, and conform to the safety warning information and operation instruction
strictly to use the instrument.
1. When voltage above 30V, current above 10mA, AC power line with inductive load or AC power line
during electric fluctuation measuring, please beware of electric shock.
2. Prior to measurement, check if the measurement function is in conformity with the LCD display, and if
the pushbutton switch is at the trigger position. Check if the testlead is contacted reliably, connected
correctly, and grounded well and etc. in order to avoid electric shock.
3. The meter can only be used with the matched testlead which you can see in the box, if the testlead is
damaged, it is necessary to replace another one of the same model or the same electrical specification.
4. Don’t use other unconfirmed or disapproved fuses. Only the same model or same specification fuses as
we provide can be used. Before the replacement, the testlead must leave the measuring point and ensure
there is no any signal at the input terminal.
5. Don’t use other unconfirmed or disapproved battery. Only the same model or same specification battery
as we provide can be used. Before the replacement, the testlead must leave the measuring point and
ensure there is no any signal at the input terminal.
6. During electrical measurement, never let your body get in touch with the ground directly, and don’t
touch uncovered metal terminal, output port, lead clamp and etc. where earth potential may exist. Dry
clothes, rubber shoes, rubber cushion and other insulating material are usually used to keep your body

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insulated against the ground.
7. Don’t store and use it in the high-temperature, high-humidity, inflammable and strong magnetic field
environment.
8. It may damage the meter and endanger the operator’s safety if the voltage value beyond the permitted
ultimate voltage value is measured. The ultimate voltage value permitted for measurement is marked on
the instrument panel, and never measure the value exceeding the standard. Don’t input the ultimate
value out of regulation in order to avoid electric shock and the damage to the meter.
9. When the testlead is inserted into the current socket, don’t measure any voltage for fear that the meter
should be damaged and the operator’s safety be endangered.
10. Don’t try calibrating or repairing the meter. When it is indeed necessary for that, only the qualified
professional personnel who have had special training or gained approval can make it.
11. During measurement, the requirement of measurement function must be in accordance with LCD
display. Please be sure to disconnect the line of the testlead with the measured object first and ensure
there is no any input signal. It is forbidden to switch the function/range selection switch during
measurement
12. When “” is shown on LCD display, please replace battery immediately to ensure the
measurement precision.
13. It is not allowed to insert the testlead into the current terminal to measure voltage!

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14. Please don’t change the circuits of the meter freely for fear that the meter will be damaged and the
safety be endangered.
Ⅳ. Description of Safety Symbols
Warning!
AC/DC
High Voltage! Danger!
In accordance with the
instructions of European
Trade Union
Ground
Fuse
Double Insulation
Low battery
Ⅴ. Description of Instrument Panel and Pushbutton Functions
1. Instrument model.

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2. LCD display area.
3. Function button: Used to select various measurement functions.
3-1 Backlight selection switch, trigger it once to turn on the backlight, and trigger it once more to
turn off the backlight.
3-2 It is automatic identification when start-up. Press SELECT to
enter automatic measurement, MAX/MIN: the maximum
value and minimum value. Press the function button and
enter MAX mode, in which the maximum value is held;
press the button again to enter MIN mode, in which the
m i nimum value is held. After the MAX/MIN mode is entered,
the display device indicates the current value. Press down
MAX/MIN button for 2 seconds, and then exit from MAX or
MIN test.
3-3 Manual range selection switch. It is automatic identification
when start-u p . Press SELECT to enter automatic
measurement. Trigger “RANGE”button, automatic/manual
range switch. In the mode of manual range, trigger “RANGE”button, when you press the button,
the range change to a higher one, when it goes to the highest range, it goes back to the lowest

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range when the button is pressed again. The procedure repeats again and again like this in the
same order. Press down the button for more than 2seconds, then exit from manual range and
enter the state of automatic range measurement.
3-4 SELECT: Button switch, it is used to select various measurement functions.
3-5 HOLD: Hold readings. Press the button to lock the displayed value, and press it again to unlock
it.
4. Power function switch.
5. Function selection button.
6. 10A current input jack: Measure the positive input terminal of 10Ashift AC/DC current, and insert red
testlead.
7. mA input port: Measure the positive input terminal of AC/DC.
8. COM input port: Measure the negative input terminal, and insert black testlead.
9. input port: Measure the positive input terminal of voltage, frequency, resistance, capacitance,
diode as well as continuity test, and insert red testlead.

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Ⅵ. Other Functions
1. Automatic power off
After the meter is stopped for 10 min, it will cut off power automatically (power off), and then enter
the dormant (power off) state. Within one minute before power off, the built-in buzzer will send out
warning tone for 3 times. After one minute, it beeps for several seconds and enters the dormant
(power off) state. If you want to restart power (power on), it is available to press “SELECT”，
“RANGE ”“MAX/MIN” or “HOLD” key, or press the power switch to make it. If you want to cancel
automatic power-off, press “SELECT”at the same time when you press down the power switch, then
automatic power-off will be cancelled after power on, and “APO”symbol will be also turned off.
VII. Features
1. General features
1－1 Display mode: LCD
1－2. Maximum display: 5999, 3 5/6 display automatic polarity display and unit display.
1－3. Measurement mode: dual integration A/D conversion

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1－4. Sampling rate: About 3 time/s.
1－5. Over rang: Display “OL”
1－6. Low voltage display: thesymbol displayed.
1－7. When it is over 30V AC/DC voltage, the symbol “ ” is displayed
1－8. Working temperature: 0～40℃, relative humidity <80%
1－9. Storage temperature: -10～50℃, relative humidity <80%
1－10. Power: 6F22 9V battery
1－1 1 . V o lume (Dimensions): 185mm×91mm×49mm（Length, width and height）
1－12. Weight: About 408g (including battery )
2．Technical features.
2-1. Accuracy: ±（a% reading + d digits）, the ambient temperature for ensuring accuracy: 23±5℃,
relative humidity <75%.
2-2．The warranty period of calibration is one year from ex-factory date.
VIII. DC Voltage (DCV)
1．Trigger “AC/DC/EF”, at this time it is at the AC/DC voltage automatic identification mode, and

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respectively plug in the red and black testleads into the holes of “VΩHz”and“COM”, as shown in the
following diagram.
2．The initial state of the meter is the AC/DC voltage automatic identification mode and a symbol of
“SCAN” is displayed; at this time, such buttons as “RANGE”.“MAX/MIN”.“HOLD” have no
controlling functions, and only when “SELECT” button is pressed to select the non-automatic
identification mode of the automatic range can such bottoms as “RANGE”.“MAX/MIN”.“HOLD”
play their function controlling.
3．Touch the measuring point with the testlead and connect it in parallel to the circuit being tested, and
the polarity of the red testlead wire and the tested voltage value
are spontaneously displayed on the display.
Caution:
a）Voltages over DC1000V or AC750V cannot be tested.
b）When measuring high voltages, special precautions must be taken
to avoid electrical shock. When measurement is completed,
immediately disconnect the testlead and the measured circuit.
c）In case “OL” is displayed under manual range mode, it indicated
the range has been exceeded and it is necessary to select higher
range to complete this measurement.

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Range
Accuracy
Resolution
600mV
±(0.5%+4 d )
0.1mV
6V
1mV
60V
10mV
600V
100mV
1000V
±(1.0%+6 d )
1V
Input impedance: 600mV range > 60MΩ，the others are 10MΩ.
Overload protection：DC 1000V or AC 750V peak value
IX. AC Voltage (ACV)
1．Trigger “AC/DC/EF”, at this time it is at the AC/DC voltage automatic identification mode, and
respectively plug in the red and black testleads into the holes of “VΩHz”and“COM”, as shown in the
following diagram.
2．The initial state of the meter is the AC/DC voltage automatic identification mode and a symbol of “SCAN”
is displayed; at this time, such buttons as “RANGE”.“MAX/MIN”.“HOLD” have no controlling functions,

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and only when select the non-automatic identification mode of the automatic range can let such bottons as
“RANGE”.“MAX/MIN”.“HOLD” play their function controlling.
3．Touch the measuring point with the testleads and connect it in parallel to the circuit being tested, and the
polarity of the red testlead wire and the tested voltage value are spontaneously displayed on the display.
Caution:
a) Voltages over DC1000V or AC750V cannot be tested. If the
“OL” shows on the LCD under the manual range mode,it means
the range has been exceeded and it is necessary to select higher
range to complete this measurement.
b) At automatic identification measurement, the AC threshold
voltage is 0.5V; in case the voltage to be measured is smaller
than 0.5V, press the “SELECT” button to select automatic ACV
measurement. In case the AC mV mode is used, please select the
“RANGE” button.

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Range
Accuracy
Resolution
600mV
±(1.6%+10d )
0.1mV
6V
±(0.8%+10d )
1mV
60V
10mV
600V
100mV
750V
±(1.0%+10d )
1V
Input impedance: 10MΩ. Overload protection：DC 1000V or AC 750V peak value
Display：Mean value response（calibrated with sine wave）.
Frequency response：600mV: (40-100)Hz. 6V-750V: (40－400)Hz
X. DC Current (DCA)
1．Put the black testlead into the “COM” terminal and the red testlead into the “mA” or “10A” terminal.
Trigger the “ “ button or “ “ button, select automatic identification ACA/DCA measurement,
and at this time such buttons as “RANGE”.“MAX/MIN”.“HOLD” do not have the controlling functions,
and only when the “SELECT” button is pressed again to select automatic range AC or DC current

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measurement can let such buttons as “RANGE”, “MAX/MIN”, “HOLD” re-get function controlling.
2．In case “OL” is displayed on the LCD, it indicates the current being
measured has exceed the current range, and please select higher
range for measurements.
Caution:
a）At the 10A range, current bigger than 10A cannot be measured,
and at mA mode, the current bigger than 600 mA cannot be
measured. Otherwise this will lead to the burning of the fuse or
damage the instrument.
b) When the testleads plugged in the input terminal of the current,
it is strictly prohibited to have the testlead connected in parallel
on any circuits.
Range
Accuracy
Resolution
60mA
±(1.0%+10d)
10μA
600mA
100μA
10A
10mA
The maximum input current: 10A (not exceeding 15s))
Overload protection: 0.6A/250V fuse ; 10A/250V fuse
× Ô¶ ¯Ê ¶± ð½ »Ö ±
Á ÷µ çÁ ÷Ñ ¡Ô ñ¼ü
AC/
EF
DC/
Hz
× Ô¶ ¯Ê ¶± ð½»Ö ±Á ÷
µ çÁ ÷10AÑ ¡Ô ñ¼ ü
AC/
EF
DC/
Hz

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XI. AC Current (ACA)
1．Put the black testlead into the “COM” terminal and the red
testlead into the “mA” or “10A” terminal. Trigger the
“ “ button or “ “ button, select automatic
identification AC/DC measurement,, and if the current is lower
than 10% of the full range, the automatic identification is lower
than its threshold, measurements cannot be conducted. Please
press “SELECT button to select automatic ACA range to test.
2．In case “OL” is displayed on the LCD, it indicates the current
being measured has exceed the current range, and please select
higher range for measurements.
Caution:
a) At the 10A range, current bigger than 10Acannot be measured,
and at mA mode, the current bigger than 600 mA cannot be
measured. Otherwise this will lead to the burning of the fuse
or damage the instrument.
b) Under automatic identification mode, such buttons as
Hz
DC/
EF
AC/
Á ÷µ çÁ ÷Ñ ¡Ô ñ¼ü
× Ô¶ ¯Ê ¶± ð½ »Ö ±
Hz
DC/
EF
AC/
µ çÁ ÷10AÑ ¡Ô ñ¼ ü
× Ô¶ ¯Ê ¶± ð½ »Ö ±Á ÷

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“RANGE”.“MAX/MIN”.“HOLD” do not play the controlling functions.
c) When the testleads plugged in the input terminal of the current, it is strictly prohibited to have the
testlead connected in parallel on any circuits.
Range
Accuracy
Resolution
60mA
±(1.5%+10d)
10μA
600mA
100μA
10A
±(2.0%+15d)
10mA
Maximum input current: ：10A（Not exceeding 15s）.
Overload protection: 0.6A/250Vfuse；10A/250V fuse
Frequency response:：40～100Hz.
XII. Resistance
1．Trigger “ “ button, and pu t the red and black testleads into the “VΩHz”and “COM ”terminal.
2．After the instrument is started, triggering “ “ button is the automatic identification measurement of
resistance, diode, buzzer and capacitance. Under the mode of automatic identification such buttons as
“RANGE”.“MAX/MIN”.“HOLD”do not play the controlling functions, and in case the measurement is
bigger than 1MΩ, only when the “SELECT” button is triggered to choose the automatic range resistance

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mode can continue to test, and at this time “RANGE”.“MAX/MIN” “HOLD” re-get the controlling
Caution:
a）When measuring resistance, all the powers within the tested circuits must be disconnected and the
capacitance should be sufficiently discharged.
b）When measuring the resistance, any occurrence of voltage may lead to inaccurate readings, and if the
250V protection voltage is exceeded, it may damage the meter or threaten the safety of the user.
c）When using the range of 600Ω, first to short-circuit the testleads and measure the resistance of the
lead wire and then deduct it in the actual measurement.
Range
Accuracy
Resolution
600Ω
±(0.8%+5d)
0.1Ω
6kΩ
±(0.8%+4d)
1Ω
60kΩ
10Ω
600kΩ
100Ω
6MΩ
1kΩ
60MΩ
±(1.2%+10d)
10kΩ
Open circuit voltage: 600mV.
Overload protection: DC 250V or AC peak value.

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XIII．Diode and Continuity Test
1. Press “ ” button and respectively put the red and black testlead into “VΩHz”and“COM” terminal.
2. After the instrument is started, triggering “ “ button is the automatic
identification measurement of resistance, diode, buzzer and capacitance.
Under the mode of automatic identification such buttons of
“RANGE”.“MAX/MIN”.“HOLD”do not play the controlling functions,
trigger “SELECT” to select the diode or buzzer measurement, at this
time such buttons as “MAX/MIN”. “HOLD” re-get the controlling
functions.
3. Connect the red testlead to the positive of the diode, the black testlead
to the negative of the diode.
Caution:
a）In case the diode is open circuit or the polarities are connected
reversely, “OL” will display.
× Ô¶ ¯Ê ¶± ðµ ç× è
¶ þ¼«¹ Ü· äà ùÆ÷
AC/
EF
DC/
Hz
µ çÈ ÝÑ ¡Ô ñ° ´¼ ü
µ çÈ ÝÑ ¡Ô ñ° ´¼ ü
Hz
DC/
EF
AC/
¶ þ¼«¹ Ü· äà ùÆ÷
× Ô¶ ¯Ê ¶± ðµ ç× è

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b）When checking the diode, all the powers within the tested circuits must be disconnected and the
capacitance should be sufficiently discharged.
c)When the measurement is completed, immediately disconnect the testlead and the measured circuit.
Range
Display value
Measurement condition
Diode forward voltage drop
Forward DC current is about
1.0mA, and backward voltage is
about 3.0V.
30Ω Buzzer sounds for a long
time and the resistance of the
two points is measured as 30Ω
Open circuit voltage is about 1.2V
Overload protection: 250V DC or AC peak value.
XIV. Capacitance（C）
1．Press “ “ button and respectively pu t the red and black testleads into “VΩHz”and“COM”.
2．After the instrument is turned on, triggering the“ “ button is the automatic identification measurement

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of resistance, diode, buzzer and capacitance. Under the mode of automatic identification, such bottons as
“RANGE”.“MAX/MIN”.“HOLD” do not play the controlling functions. In case the capacitance being
measured is smaller than 0.5nF and bigger than 600uF, please trigger the “SELECT” button to choose the
non-automatic identification automatic capacitance measurement mode, and at this time, such buttons as
“MAX/MIN”“HOLD”“RANGE” play the functions. (When the electric supply 220V is mistakenly fed into
the capacitance mode, the circuit may have automatic protection and it will not damage the meter. )
Caution:
a）When measuring the capacitance, all the powers within the tested circuits must be disconnected and the
capacitance should be sufficiently discharged, when measuring
big capacitance, it takes a longer time.
Range
Accuracy
Resolution
6nF
±(2.5%+20d)
1pF
60nF
10pF
600nF
100pF
6μF
1nF
60μF
10nF
600μF
100nF
6mF
1uF
60mF
±(5.0%+10d)
10uF