Victor VC921 Operation Manual

DIGITAL MULTIMETER

OPERATION MANUAL

WARNING

To avoid electric shock or injured

or damage the instrument, please

read the manual carefully before

operation.

Ⅰ

. SAFETY RULES

This series meter meets the

standard of IEC1010. Read it

before operation.

0

1

．

Check the case of the meter

and test leads before operation.

2

．

Do not input over range when

testing.

3. Be careful when measuring

voltage over ACV 40V or DCV

60V.

4

．

When measuring, must select

correct function and range.

5

．

The test lead should be keep

away from the tested point when

change the function.

6. Do not try to modify the circuit,

Or you may damage the instrument

1

and endanger personal safety.

7. Safety symbols

“ ” exists high voltage , “ ”

dual insulation ,“ ” warning

8

．

Electric symbols

“ ”GND

， “ ”

low battery

“ ” AC “ ” DC “

”continuity test “ ”diode “

”relative value measurement

“ ”auto range

II.KEY FUNCTION

1.REL: press this key ,readings

2

back to zero , enter into relative

measurement ,LCD display “

” symbol, press it again, out from

the relative value measurement

function .when at Hz range, can

switch to frequency or duty cycle

(0.1~99.9%) measurement mode.

2.RANGE key :selecting operation

mode of auto range or manual

range .the default mode of this

meter is auto range , LCD display“

” symbol, press this key will

change to manual range, press it

3

one more time to increase a new

range, from low to high cycle in

turn .press the key for more than 2

seconds, will back to auto range

mode.

Ⅲ

. SPECIFICATION

3-1

．

GENERAL

3-1-1

．

Displaying : LCD

displaying

3-1-2

．

Max. indication: 3999

（

3

3/4

）

, auto polarity indication

3-1-3

．

Measuring method: dual

slope A/D transfer

4

3-1-4

．

Sampling rate: approx. 3

times/sec

3-1-5

．

Over range indication:

displays “OL”

3-1-6

．

Low battery indication: “

” symbol displays

3-1-7

．

Operation: (0

～

40)℃

，

relative humidity <80%

3-1-8

．

Power

：

2×1.5V battery

3-1-9

．

Meas.:124×80×20 mm

3-1-10

．

Weight: approx.

140g

（

including battery

）

3-1-11. Accessories: instruction

manual, gift box and battery

5

3-2

．

TECHNICAL DATA

3-2-1

．

Accuracy: ±

（

RDG

×a

%

+ digit

）

at (23±5) ,<75%RH℃

one year guarantee from

production date

3-2-2

.DCV

RANG

E

ACCURACY RESOLUTION

400mV

±(0.5%+4)

0.1mV

4V 1mV

40V 10mV

400V 100mV

600V ±(1.0%+4) 1V

6

Input resistance

：

10MΩ

Overload protection: 400Mv

range:250V RMS

＜

10seconds ;other

ranges 600VRMS

＜

10seconds .

3-2-3. ACV True RMS

Measurement

RANGE ACCURACY RESOLU7TION

400mV ±(1.5%+6) 100μV

4V

±(0.8%+6)

1mV

40V 10mV

400V 100mV

7

600V ±(1.0%+6) 1V

Input resistance: 10MΩ

Overload protection: 400mV

range: 250V RMS

＜

10seconds(manual range only).

Other ranges 600VRMS

＜

10seconds.

Frequency response: Sine wave

and triangular wave :

(40~1000)Hz, other waveform:

( 40~400)Hz

Displaying: True RMS response

8

3-2-4. CONTINUITY TEST

Overload protection: 250VRMS

Warning: do not input voltage at

this range.

Range Display Test Condition

Buzzer

sound at

less than

(50±30)Ω

OCV: about 0.5V

9

RANGE

DISPLAYING

VALUE

TEST

CONDITION

Forward

voltage drop

of diode

Forward

DCA is

approx.

0.5mA

，

bac

kward

voltage is

approx. 1.5V

10