Victor 98a User manual

- 1 -

Chapter

1

Introduction

Warning

Read

Safety

Information

before

using

the

meter.

S

ummarize

The meter is a handled, battery-operated tool for measuring electrical parameters. It has all the features of a digital millimeter

and measure AC voltage, DC voltage, AC current, DC current, resistance, capacitance, frequency , duty cycle ratio , dBm, TC,

RTD, Diode

Diode

Test,

and Continuity

Continuity

Check

.

Besides, it has features like:



Large LCD screen could display the three characteristic of one input signals.



Different referen ce impedance for dB measure function .

AUTO HOLD, DISPLAY HOLD and PEAK HOLD to display the measuring value.

Panel c alibration function.



Three convenient data recording modes: LOG mode, MANUAL mode, and COMP mode.

USB-IR jack to connect with a PC

Open-case

Inspection

Open the case to check, if the meter is damaged or something is missing, contact the place of purchase immediately. Contact

the distributor for information about DMM accessories.

Accessories : A copy of user ’ s manual

A

set of CF-733370 industrial test lead

One USB to UART Bridge Controller ( USB_DMM)

DMMVIEW_ A disk

Options: K-TYPE TC

Safety

Information

The meter complies with IEC61010.1-93 Over voltage ⅡPollution Degree 2. Use the meter only as specified in this manual.

Otherwise, the protection provided by the meter may be impaired.

AWarning

Warning

identifies conditions and actions that pose hazards to the user.

ACaution

Caution

identifies conditions and actions that may damage the meter or the equipment under test.

A

Notice

identifies symbols of the operation and explanations of the features. International symbols used on the meter and in

this manual are explained in Table 1-1.

Warning

To

avoid

possible

electric

shock

or

personal

injury,

follow

these

guidelines

.



Use

the

meter

as

the

instructions

of

the

producer;

otherwise

,

the

protective

function

shall

be

invalid.



Do

not

use

the

meter

if

it

is

damaged.

Before

you

use

the

meter,

inspect

the

case.

Look

for

cracks

or

missing

plastic.

Pay

particular

attention

to

the

insulation

surrounding

the

connectors.



Take

the

leads

off

the

meter

before

unlock

the

battery

door.



Inspect

the

test

leads

for

damaged

insulation

or

exposed

metal.

Check

the

test

leads

for

continuity.

Replace

damaged

test

leads

before

you

use

the

meter.



Do

not

use

the

meter

if

it

operates

abnormally.

Protection

may

be

impaired.

When

in

doubt,

have

the

meter

serviced.



Do

not

operate

the

meter

around

explosive

gas,

vapor,

or

dust.



Do

not

apply

more

than

the

rated

voltage,

as

marked

on

the

meter,

between

terminals

or

between

any

terminal

and

earth

ground.



Make

sure

the

meter

works

normally

as

per

testing

a

known

voltage.

Do

not

use

the

meter

if

it

operates

abnormally.

When

in

doubt,

have

the

meter

serviced.



To

avoid

possible

electric

shock

caused

by

false

reading

due

to

exist

ting

alternating

voltage

in

all

the

direct

current

functions,

including

manual

and

auto

rang

ing

,

make

sure

whether

there

is

any

alternating

voltage

existing

or

not

before

selecting

a

direct

voltage

range

equals

to

or

higher

than

the

alternating

voltage.



T

o

avoid

false

readings,

which

could

lead

to

possible

electric

shock

or

personal

injury,

replace

the

batteries

as

soon

as

the

low

battery

indicator

appears.



Do

not

touch

the

exposed

wine,

connector

or

unused

input

jack

or

circuit

under

test

when

the

meter

is

working.



Use

only

type

AA

A

batteries,

properly

installed

in

the

meter

case

to

power

the

meter.



Use

caution

when

working

above

30

V

ac

rms,

42

V

peak,

or

60

V

dc.

Such

voltages

pose

a

shock

hazard.



Avoid

working

alone.



When

using

the

probes,

keep

your

fingers

behind

the

finger

guards

on

the

probes.



Connect

the

common

test

lead

before

you

connect

the

live

test

lead.

When

you

disconnect

test

leads,

disconnect

the

live

test

lead

first.



To

avoid

possible

fire

or

electric

shock,

do

not

connect

TC

with

the

live

circuit.

Caution

To

avoid

possible

damage

to

the

meter

or

to

the

equipment

under

test:



Set

the

rotary

switch

on

the

right

range.

Do

cut

off

the

testing

leads

and

circuit

before

switching

.

Forbid

to

switch

during

the

measuring

process.

- 2 -



C

ut

off

the

power

and

complete

discharge

before

measur

ing

resistance,

continuity,

diodes,

or

capacitance

with

the

live

circuit

.



Before

measuring

current,

check

the

meter

’

s

fuses

(see

Chapter

6

“

Testing

the

Fuses

”

).

T

urn

power

OFF

to

the

circuit

before

connecting

the

meter

to

the

circuit.

Remember:

Plug

the

meter

with

the

circuit

when

measuring

current

and

d

o

not

connect

test

lead

in

parallel

with

any

circuit.

Symbols

Symbols used on the meter and in this manual are explained in Table 1- 1 .

Table

1-

1

.International

Electrical

Symbols

Chapter

2

Getting

Acquainted

Introduction

Study this chapter to be acquainted with all the features and functions of the meter.

Turning

the

Meter

On

To turn the meter on, press to power on and press again for more than 2 seconds to power off.

When the power is turned on, the source starts to make self-diagnosis internally and displays on full screen. After this,

appropriate operation should be carried out.

Attention

Power-

on:

To

ensure

the

correct

operation

of

the

meter

with

power

on.

It

is

good

practice

to

turn

off

the

power

supply

pausing

5

seconds,

and

then

restart

the

meter

.

Automatic

Power

Off

T he meter will go into automatic power- off mode if you have not changed the rotary switch position or pressed a button for a set period .

The automatic power off is preset to 10 minutes. From the Setup menu (see Chapter 5 ” Changing the Default Settings ” ), users can

decide whether they want to use the function of the automatic power-off or not.

Backlight

O

n

To turn the backlight on, press to turn on and press again to turn off.

Automatic

backlight

off

The automatic backlight off is preset to 30s. If user doesn ’ t turn off backlight within 30s, the meter will turn off backlight automatically. From the

Setup menu (see Chapter 5 ” Changing the Default Settings ” ), users can decide whether they want to use the function of the automatic

backlight off or not.

Low

Battery

Indicat

or

The battery indicator in the upper right corner of the display notifies you that the batteries are low and should be replaced.

Warning

To

avoid

false

readings,

which

could

lead

to

possible

electric

shock

or

personal

injury,

replace

the

batteries

as

soon

as

the

battery

indicator

appears.

If the battery indicator appears, it will lead to the shut-up of the storage function.

Outer

Structure

See Figure 2-1.

Input

Jack

Figure2-2 and Table2-1 explain the input jacks.

Rotary

Switch

Figure2-3 and Table2-2 explain the measuring functions of the rotary function switch positions.

Symbols

Meaning

Symbols

Meaning

Alternating

current

Earth ground

Direct current

Fuse

Alternating and

direct current

Double

insulated

Important

information

Battery

CAT

II

CAT11 Overvoltage(Installation) Category11,

Pollution Degree 2 per IEC61010 refers to the

level of Impulse Withstand V oltage protection

provided. Typical locations include: plug and

the connecting electric equipments, home

appliance, convenient tools, domestic plug,

plugs 10m distant from type 3 circuit 20m

distant from type 4 circuit.

- 3 -

Display

Unit

Figure 2-4 and Table 2-3 explains the meaning of the every displaying unit.

Communication

interface

You

could use the USB_DMM and the DMMVIEW_A software to transfer the content stored in the meter and real time

measuring value to a PC.(See Chapter 4 ” U sing Memory & Communications Features ” )

Pushbutton

Figure2-5 and Table 2-4 show the pushbutton function.

Figure

2-1.O

uter

Structure

Figure

2-2.Input

Jacks

Table

2-1.Input

Jacks

Item

Function

①

Measuring Signal ( +): direct and alternating current ( A), frequency.

②

Measuring Signal ( +): direct and alternating current ( mA, μ A) , frequency

③

Public ( return) Jacks of all the measurement (-)

④

Measuring Signal ( +): direct voltage, direct mV voltage, alternating voltage, resistance, diodes, continuity, frequency ,

RTD, TC,CAP

C ommunication

interface

Display

screen

Pushbuttons

Rotary

function

Input

jacks

1

2

3

4

- 4 -

Figu

re

2-

3

.

Rotary

Switches

Table

2-

2.Rotary

Switches

NO

Position

Rotary

Switch

Function

Blue

Pushbutton

Function

①

AC Voltage Measurement

d Bm Measurement

②

DC Voltage Measurement

None

③

DC mA Voltage Measurement

TC Measurement

④

Resistance Measurement

Diode testing, continuity testing, RTD

testing

⑤

Capacitance

None

⑥

Direct current measurement

A lternating current measurement

⑦

D irect current measurement

A lternating current measurement

⑧

Direct current measurement

A lternating current measurement

⑨

Read or clear the stored data in the meter . See Chapter 4 for the detailed

information

None

6

5

1

7

3

4

8

9

2

- 5 -

Figure2-4.Display

Unit

Table

2-3.Display

Unit

No.

Unit

Meaning

①

Display Hold ：

To

hold present value in the main display

Peak Hold ：

Valid

only in DCV position

Auto Hold ：To freeze the present value in auto hold mode

②

Toggles in auto-ranging mode

③

To

access yellow button ( ) function

④

Readings are being recorded in logging mode

⑤

Readings are being recorded in comparative mode

⑥

Min.

Max.

Avg.

Limited value measurement ，primary display shows MIN 、MAX 、

AVG

value in cycle

while secondary display shows present reading 。

⑦

Low battery indicator . The indicator in the display notifies you that the batteries are low and

should be replaced.

Warning

To

avoid

false

readings,

which

could

lead

to

possible

electric

shock

or

personal

injury,

replace

the

batteries

as

soon

as

the

low

battery

indicator

appears.

4

1

2

3

12

13

11

9

8

5

6

7

14

17

16

15

10

- 6 -

Table

2-3.

Display

Unit

(Cont.)

Table 2-3. Display Unit (cont.)

Figure

2-5.

Pushbutton

No.

Unit

Meaning

⑧

Ω

、k

k

Ω

、M

M

Ω

The unit of resistance: Ohm , K ilohm, M egohm .

Hz

、kHz

kHz

、MHz

MHz

The unit of frequency: H ertz, K ilohertz, and Megahertz .

A

、mA

mA

、µ

µ

A

The unit of current: Amperes (amps) , Milliamp , Micro amp.

V

、mV

mV

The unit of voltage: Volt , Mill volt

nF

、µ

µ

F

The unit of capacitance : Nanofarad , Microfarad , Millifarad.

°C

C

、 ° F

F

Degrees Celsius (default) or Fahrenheit.

dBm

For ac volts functions, reading is shown in decibels of power above or below 1 mW

(dBm) .

AC

DC

Alternating current, direct current.

%

Display the duty cycle ratio of signals when measuring frequency.

⑨

Bar Graph

The polarity indicator both ends of the bar graph show the polarity of the input; the arrow

right of the bar graph indicates an overload condition.

⑩

41000

Range display . Digits display range in use.

11

○

Time d isplay s . In addition, it could be used to temperature display as well.

Unit displays.

NO.

Unit

Meaning

12

○

Elapsed Time Display

13

○

Secondary Display , and could be used to show the sequence number of the stored

information.

Unit Display of the s econdary d isplay

14

○

MEM

Readings are being recorded in manual stored mode

15

○

Primary Display （3 3/4 digital ）

16

○

Continuity test function is selected.

>30 V ac and/or dc may be present at the input terminals

Relative measured value

Diodes Test

17

○

In Calibration mode

- 7 -

- 8 -

Table

2-4.Pushbutton

Using

Hold

Mode

In the measuring mode, use to select Display Hold , Auto Hold

or

Peak Hold. Press again

to

exit.

START

HOLD

The above three functions are not available when recording data.



Display

Hold

Mode

(D.H)

The primary display preserves the present value, and displays “ ” (see Figure 2-6 ) .

Figure 2-6. D.H Mode

In MAX, MIN mode, no further minimum, maximum, or average updates occur while the HOLD mode is enabled.

Pushbutton

Description

Yellow

Button

Function

Description

Note

Press to access “ Yellow Button Functions ” , and will be on display

○

Press to access blue functions on the rotary switch.

In Setup and Comparative Mode, use arrow

function ( ) function to select the next digit

( None )

START

HOLD

In measuring mode, s elects between the D .H , A.H and

P.H functions. To cancel functions, press this key once

again.

In Logging mode or Comparative mode, press

to start storage function.

START

HOLD

( None )

In measuring mode , press to exit auto-ranging

and enter manual ranging. In manual, select next

input range.

In C omparative mode ，press to set MAX and

MIN value.

Press to enter Setup mode when turning the

meter on ，and press to select the set value in

the mode.

( None )

In measuring mode , p ress to store the present

reading as an offset reference; subsequent readings

show only the relative difference from this value.

In MEM mode ，press to read the Save Data.

Enter SAVE mode.

In SAVE mode, press to save

present value. Press for more than 2

seconds to exit.

In Setup or comparative mode, increment a digit.

In MEM mode to read the display value ，

press to get the previous record.

In measuring mode

，

press t o

return to A U TO ranging.

In measuring mode, successively press to

select frequency, duty cycle ratio, and voltage

(current) in Voltage and Current position(except

DC mV function)

In MEM mode, press to read LOGGING Data.

Enter LOG mode.

Press for more than 2 seconds to exit.

In measuring mode , press to start retaining

min, max, and average values.

Press successively to display MAX, MIN, and

AVG

value.

Press for more than 2 seconds to stop.

In MEM ，press to read COMP Data.

Enter SAVE mode.

Press for more than 2 seconds to exit.

In Setup or COMP mode, decrement a digit.

In MEM mode ，press to get the next data stored

otherwise to clear off the data if pressing for more

than 2 seconds

（None ）

Turn on the power or backlight.

Press for less than 2 seconds to turn on or off the

backlight and more than 2 seconds to power off.

（None ）

- 9 -



Auto

HOLD

Mode

(

A.H)

Warning

Auto

HOLD

mode

does

not

capture

unstable

or

noisy

readings.

Do

not

use

Auto

HOLD

mode

to

determine

that

circuits

are

without

power.

Auto HOLD mode freezes the present reading in the primary display (The “ ” is displayed) . New readings now appear in

the secondary display. See Figure 2-7. When the meter detects a new, stable reading (>10% change from last stable reading), it

beeps and displays the new reading in the primary display.

Figure 2- 7 . A .H Mode

If you remove the test leads (open the input), the meter retains the last frozen primary display.

You cannot initiate Auto HOLD while MAX MIN, REL, TC, RTD, dBm, DC mV, AC mV, Diodes, continuity, Capacitance,

Frequency, or Duty cycle ratio function is active.



Peak

HOLD

Mode

(

A.H)

Note

Peak

HOLD

mode

is

only

available

in

(DCV)

.

In Peak HOLD mode, the meter detects, refresh, and displays the peak value in DCV and display “ ” . (See figure 2-8).

Figure 2- 8 .

P

.H Mode

Peak HOLD mode could capture the signals of an imminent of a positive polarity as short as 1 ms except that the accuracy is low .

In Peak HOLD mode, press to calculate the relative value and the screen will show symbol “ ” and the relative peak

value.

Press to clear the value off and the new peak value would be captured .

Using

Relative

Mode

(REL)

In measurement mode, press enter into relative mode and the meter displays the present reading as a reference in the

secondary display and the relative value in the primary display (The difference between the reference and a new measurement).

Press again to exit the mode.

This function is available with all functions except frequency/duty cycle ratio, MAX MIN, TC, RTD, dBm measurement.

Figure2-9 . Relative Mode

Warning

Do

be

careful

for

the

possible

dangerous

voltage

in

the

relative mode.

mode.

- 10 -

Selecting

the

Range

Press to select a fixed range.

Auto ranging ( “ ” lighted in the display) always comes on initially when you select a new function. In auto range, the meter

selects the lowest input range possible, ensuring that the reading appears with the highest available precision (resolution).

If AUTO is already on, press to enter MANUAL ranging in the present range. You can then select the next manual range

each time you press . Return to auto ranging by pressing .

Note

You cannot use in conductance, diode test, or with the TC, RTD, and MAX MIN

features. These selections all have a specific fixed range. You cannot use in the

capacitance and frequency measurement functions, which have Auto ranging only. DC

mV has manual ranging only.

Using

MIN

MAX

Mode

Note

The function is invalid in REL, TC, RTD, dBm, DC mV, Diodes, Continuity, Capacitance,

Frequency, Duty cycle ratio features.

The MIN MAX mode stores minimum (MIN) and maximum (MAX) input values . MIN MAX mode also calculates an average

(AVG) of all readings taken since the mode was activated. When the input goes below the stored minimum value or above the

stored maximum value, the meter beeps and stores the new value. In addition , the meter displays the present measurement value

in the secondary display and the new value in the primary display .

Press the MAX, MIN and AVG value will be stored as the present displaying reading, and “ MAX ” will be on display

first. Each subsequent press of steps through the minimum (MIN), average(AVG) and back to the maximum reading.

MAX

MIN AVG

Th e Auto Ranging will be shut off and fixed the present range before enter max min mode. Therefore, set the right range before

choose this mode.

To exit this mode, press for more than 2 seconds or set the rotary switch to any other position.

- 11 -

Chapter

3

Making

Measurements

Introduction

Chapter 3 explains how to make measurements.

Most measurement functions can be selected by using the rotary switch.

White letters or symbols identify primary functions; blue letters or symbols identify alternative functions. Press the blue button

to access these alternate functions. Frequency-related functions can be selected when the rotary switch is in any of the

、

o

r

、、 position.

Measuring

Voltage

Voltage is the difference in electrical potential between two points. The polarity of ac (alternating current) voltage varies over

time, while the polarity of direct current voltage is constant over time.

Ranges available in volts functions are:



400.0mV ，4.000V ，40.00V ，400.0V ，750V



4.000V ，40.00V ，400.0V ，1000V



40.00mV ，400.0mV

Measuring

AC

Voltage

(

See

Figure 3-1 )

1.

Set the rotary switch to position, and “ AC ” “ V ” will be on display.

2. Insert the black lead into ” COM

COM

“ terminal, and the red lead to into the “ Ω

Ω

V

” terminal.

3. Connect the leads to the testing power.

4.

Read the measuring results from the screen.

5.

Press to display the frequency and duty cycle ratio of the tested signals.

Figure 3-1.AC V oltage Measurement

- 12 -

Warning



Do

not

apply

more

than

DC

1000

V

or

AC

750

rms

voltage;

the

meter

will

possibl

e

be

damaged

though

the

value

could

be

displayed.



Indicator

“

” is on

on

display

for

safety

note

when

30

V

ac

and/or

dc

voltage

present

at

the

input

terminals



The

meter

beeps

constantly

if

the

input

voltage

is

more

than

AC

750V

rms,

which

is

over

the

meter

’

s

range.

dB

m

Measurements

in

AC

Volts

Functions

(See

Figure

3-2)

The ac volts functions allow you to display readings as deviations in dB (decibels) above or below an established level.

Set up dB measurements with the following procedure:

1. Make an ac volt measurement to be used as a reference point.

2. Press to select dB. The dBm value appears in the primary display and the ac volts reading appears in the secondary

display.

3. Press again to turn dB off.

Normally, dB is measured as dBm, which is a measure of decibels relative to 1 milliwatt. The meter assumes a resistance of 600

in making this calculation. This resistance can be set for any value for5 0 Ω

，

75 Ω

，

93 Ω

，

100 Ω

，

150 Ω

，

300 Ω

，

600 Ω ，800 Ω

，

1200 Ω ，2400 Ω , using the meter ’ s setup capabilities (see Chapter 5.) to change the resistance.

Figure 3-2.dBm Measurements

Note

If

dBm

is

displayed,

check

that

the

reference

resistance

value

closely

matches

the

impedance

of

the

system

being

measured.

dB is calculated with the following formula:

1020log

VxdBm

Vr





＝



For dBm, Vr is the voltage across the reference resistance at 1mW. For example, Vr would be 0.7746 V with a 600-

Ω reference resistance.

Measuring

DC

Voltage

(

See

Figure

3-3)

1. Set the rotary switch to position, and “ DC ” , “ V ” will be on display.

2. Insert the black lead into “ COM

COM

” terminal, and the red lead to into the “ Ω

Ω

V

” terminal.

3. Connect the leads to the tested power.

4. Read the measuring results from the screen.

- 13 -

Figure3-3 . DC Voltage Measurement

Warning



Do

not

apply

more

than

DC

1000

V

or

AC

750

rms

voltage;

the

meter

will

possibl

e

be

damaged

though

the

value

could

be

displayed.



Indicator

“

” is on

on

display

for

safety

note

when

30

V

ac

and/or

dc

voltage

present

at

the

input

terminals



The

meter

beeps

constantly

if

the

input

voltage

is

more

than

AC

750V

rms,

which

is

over

the

meter

’

s

range.

Measuring

DC

mV

Voltage

(

See

Figure

3-4)

1. Set the rotary switch to position, and “ DC ” “ mV ” will be on display.

2. Insert the black lead into “ COM

COM

” terminal, and the red lead to into the “ Ω

Ω

V

” terminal.

Figure3- 4. DC mV Measurement

3. Connect the leads to the tested power.

4. Read the measuring results from the screen.

Measuring

TC

1. Set the rotary switch to position, and press blue button ( ) to select TC measurement.

2. Insert TC into “ COM

COM

” and “ Ω

Ω

V

”

terminals, make sure the TC jack with symbol “ + ” is connected into the “ Ω

Ω

V

”

terminal.

3 . Read the measuring results from the screen.

- 14 -

Figure3- 5.TC Measurement

The temperature degree is shown on the primary display, the TC value on the secondary display and Fahrenheit degree on

elapsed time display.

When the output jack is open circuit, the screen displays OL.

Warning

To

avoid

possible

electric

shock

or

personal

injury,

do

not

connect

the

TC

with

the

live

circuit.

Measuring

Resistance

(

See

Figure3-6)

Warning

To

avoid

possible

damage

to

the

meter

or

to

the

equipment

under

test,

disconnect

circuit

power

and

discharge

all

high-voltage

capacitors

before

measuring

resistance.

The meter ’ s resistance ranges are 400.0 Ω ，4.000K Ω ，40.00K Ω ，400.0K Ω ，4.000M Ω and 40.00M Ω .

To measure resistance, proceed as follows:

1. Set the rotary switch to position (Default value in this function)

2. Insert the black lead into “ COM

COM

” terminal, and the red lead to into the “ Ω

Ω

V

” terminal.

3. Connect the leads to the tested power.

4. Read the measuring results from the screen.

Caution



“

OL

”

appears

on

the

display

if

the

resistance

under

test

is

open

or

the

value

surpasses

the

maxim

range.



The

test

lead

can

add

0.1

Ω

to

0.2

Ω

of

error

to

resistance

measurements.

To

test

the

leads,

touch

the

probe

tips

together

and

read

the

resistance

of

the

leads.

I

f

necessary,

you

can

press

to

automatically

subtract

this

value.



Wait

for

several

seconds

for

stable

reading

when

measuring

resistance

more

than

1

M

Ω

.

Figure3-6.Resistance Measurement

Testing

Diodes

(

See

Figure3-7)

Warning

To

avoid

possible

damage

to

the

meter

or

to

the

equipment

under

test,

disconnect

circuit

power

and

discharge

all

high-voltage

capacitors

before

testing

diodes.

Use the diode test to check diodes, transistors, and silicon-controlled rectifiers (SCR), and other semiconductor devices. The

test sends a current through a semiconductor junction, and then measures the junction ’ s voltage drop. A typical junction drops

0 .5 V to 0.8 V.

To test a diode, proceed as follows:

1. Set the rotary switch to position, and press blue button ( ) to select diodes testing, and the symbol “ ” will be shown

on the left part of the screen.

2. Insert the black lead into “ COM

COM

” terminal, and the red lead to into the “ Ω

Ω

V

” terminal. The polarity of the black lead and

red lead is “ - ” and “ + ” respectively.

- 15 -

Figure3- 7 . Diode

Diode

Test

In a circuit, a similar diode should still indicate a forward bias reading of 0.5 V to 0.8 V; however, the reverse-bias reading can

vary depending on the resistance of other pathways between the probe tips.

Note

In

the

live

diodes

testing,

the

resistance

of

other

pathways

and

between

the

probe

tips

will

affect

the

reading

of

reverse-bias

voltage.

Testing

for

Continuity

(

See

Figure3-8)

Warning

To

avoid

possible

damage

to

the

meter

or

to

the

equipment

under

test,

disconnect

circuit

power

and

discharge

all

high-voltage

capacitors

before

testing

for

continuity.

Continuity is the presence of a complete path for current flow. The continuity test features a beeper that sounds if a circuit is

complete. The beeper allows you to perform quick continuity tests without having to watch the display.

See

Figure3-8.

Continuity

Test

To test continuity, proceed as follows:

1. Set the rotary switch to position, and press blue button ( ) twice to select continuity

continuity

check

and the symbol “ ” will

be shown on the left part of the screen.

2. Insert the black lead into “ COM

COM

” terminal, and the red lead to into the “ Ω

Ω

V

” terminal.

3. Connect the leads to the two ends of the tested circuit.

4. The inner beeper sounds when the tested circuit resistance is less than 50 Ω , which indicates the circuit is through.

Measuring

RTD

(

See

Figure3-9)

- 16 -

See

Figure3-9.RTD

Measurement

1. Set the rotary switch to position, and press blue button ( ) three times to select diodes testing.

2. Insert the black lead into “ COM

COM

” terminal, and the red lead to into the “ Ω

Ω

V

” terminal.

3. Connect the leads to the tested RTD .

4. Read the measuring results from the screen.

Measuring

Capacitance

(

See

Figure3-10)

Warning

To

avoid

possible

damage

to

the

meter

or

to

the

equipment

under

test,

disconnect

circuit

power

and

discharge

all

high-voltage

capacitors

before

measuring

capacitance.

Use

the

dc

voltage

function

to

confirm

that

the

capacitor

is

discharged.

The meter ’ s capacitance ranges are 50.00nF 、500.0nF 、5.000 µ F 、50.00 µ F 、100.0 µ

F.

To test capacitance, proceed as follows:

1. Set the rotary switch to position to select capacitance measurement.

2. Insert the black lead into “ COM

COM

” terminal, and the red lead to into the “ Ω

Ω

V

” terminal.

3. Connect the leads to the tested capacitance.

4. Read the measuring results from the screen.

Caution



OL

appears

on

the

display

if

the

tested

capacitance

is

open

or

the

value

surpasses

the

maxim

range.



If

the

test

ed

capacitance

is

polar

capacitance,

then

connect

the

red

lead

with

the

positive

point

and

the

black

lead

with

the

negative

point.



High

capacitance

test

needs

more

time,

and

30s

is

necessary

in

100

µF

F

position.



To

improve

the

measurement

accuracy

of

small

value

capacitors,

press

with

the

test

leads

open

to

subtract

the

residual

capacitance

of

the

meter

and

leads.



The

remaining

voltage

of

capacitance

,

insulated

impedance

and

dielectric

absorption

could

cause

measuring

errors.



Only

Auto

r

anging

mode

is

available

in

capacitance

measurement.

See

Figure3-10.

Capacitance

Measurement

Measuring

Current

(

See

Figure3-11,

Figure3-12)

Warning



Never

attempt

an

in-circuit

current

measurement

where

the

open-circuit

potential

to

earth

is

greater

than

1000

V.

You

may

damage

the

meter

or

be

injured

if

the

fuse

blows

during

such

a

- 17 -

measurement.



You

must

open

the

circuit

under

test,

then

place

the

meter

in

series

with

the

circuit.

Caution

To

avoid

possible

damage

to

the

meter

or

to

the

equipment

under

test,

check

the

meter

’

s

fuses

before

measuring

current.

Use

the

proper

terminals,

function,

and

range

for

your

measurement.

Never

place

the

probes

across

(in

parallel

with)

any

circuit

or

component

when

the

leads

are

plugged

into

the

current

terminals.

To measure ac or dc current, proceed as follows:

1. Insert the black lead into the COM terminal. Insert the red lead in an input appropriate for the measurement range as shown

in Table 3-1.

2. When using A

A

jack, set the rotary switch on position; When using mA

mA

µ

A

jack, set the rotary switch on position if

the current is less than 4000 µ A and position if the current is more than 4000 µ A.

3. The meter is preset to direct current, and the screen shows “ DC ” ; Press blue pushbutton （） once to select alternating

current measurement and the screen shows “ AC ” .

4. Open the circuit path to be tested. Touch the red probe to the more positive side of the break; touch the black probe to the

more negative side of the break. Reversing the leads will produce a negative reading, but will not damage the meter.

5. Turn on power to the circuit, and read the measuring results from the screen.

6. Press to toggle between the frequency and duty cycle ratio of the signals under test.

7. Turn off power to the circuit and discharge all high voltage capacitors. Remove the meter and restore the circuit to normal

operation.

Table

3-1.Current

Measurement

Notice



Start

measuring

from

the

high

range

if

the

current

can

’

t

be

evaluated.



For

safety,

the

measuring

time

should

be

limited

within

15s,

while

the

interval

should

be

more

than

10

min

when

measuring

high

current.

If

the

input

current

is

more

than

10.00A,

then

the

inner

beeper

sounds

constantly

indicating

the

value

surpass

the

range.

Figure3-11.DC

Current

Measurement

Rotary

Switch

Input

Ranges

A

4.000A

10.00A

mA

40.00mA

400.0mA

µ A

400.0 µ A

4000 µ A

- 18 -

Figure3-1

2

.

A

C

Current

Measurement

Measuring

Frequency

and

Duty

cycle

ratio

(

See

Figure3-13)

In voltage and current (DC mV excluded) measurement, press to display frequency duty cycle ratio voltage (current),

frequency, duty cycle ratio, and then back to voltage (current).

F requency Duty cycle ratio Voltage (Current) Voltage (Current) F requency

Frequency Duty cycle ratio

Figure3-13.Frequency

and

Duty

cycle

ratio

Notice

Please

select

the

proper

range

in

voltage

or

current

function

before

measuring

frequency

and

duty

cycle

ratio.

- 19 -

Chapter

4

Using

Memory

&

Communications

Features

Introduction

Chapter 4 shows you how to use memory and communication features available on the meters.

Data

Storage

The meter has three types of memory data: SAVE mode, LOG mode and COMP mode.

Notice



Undertake “ clearing memory data ” operation first if the date storage functions are used firstly.

The date storage mode is unavailable when the meter is in D.H, A.H,

P .H,

Hz%

or

MAX MIN function. The COMP mode is

unavailable when measuring capacitance. The range cannot be changed when the date storage functions are active.



In MEM position, “ - - - - ” on the screen indicates data storage is empty and could save the data; “ FULL ” on the screen

indicates data storage is full and will stop saving.

In LOG

or

COMP mode, no data could be saved if there is a recording ( no matter the storage is full

or

not).

The user should clear off the memory and then start

to

save. In LOG

or

COMP mode

,

the meter will return

to

measuring

mode when the storage is full.

Low battery indicator Appears on the screen

to

indicating forbid saving.

Table

4-1.

Memory

Capacity

SAVE

Mode

Proceed as follows:

1. Press

to

save reading, “ MEM

MEM

” appears in the display and record number is displayed in the secondary display, the

meter enters into

SAVE

mode.

2. Press

to

save present value in the memory and the record number increments by one.

3. Press for more than 2S o r set the rotary switch to any other position to exit the SAVE mode.

LOG

Mode

Proceed as follows:

1. Set the starting time and interval time of the real time data (see “ Changing the Default Settings ” ) .

2. Press

,

“LOG

LOG

” appears on the screen and the recorded number appears in the secondary display; the elapsed time

display shows the time and the meter enters into LOG mode.

3. Press

to

start log mode, and counts the time. On the starting time, the meter begins

to

store the data in the Logging

Saving Memory. The meter exits the mode automatically when the storage is full.

4 . Press for more than 2S

or

change the rotary switch position

to

exit the mode.

COMP

Mode

1. Press

,

“COMP

COMP

” appears on the screen and the record number appears in the secondary display; the elapsed time

display shows the time and the meter enters into COMP mode.

2. Set the upper and lower limits. Press

to

set the upper limit and “ MAX

MAX

” appears on the screen, and the digit set part in

the primary display flashes. Press the blue button

to

select the set digits. Use

or to

change the numerical value of the

set digit s. Press again

to

set t he lower limit and “ MIN ” display s . The setting way of the lower limit is same as that of the

upper limit. Press for the third time

to

save the set data.

3. Press

to

start COMP mode. If you do not undertake step

2,

then the default value

s

of the upper and lower limits are

zero. Pressing is invalid when setting the upper and lower limit values.

Viewing

Memory

Data

Use the following procedure to view memory data:

1. Disconnect the input leads at the measurement source.

Warning

To

avoid

electric

shock,

disconnect

the

test

leads

when

the

rotary

switch

is

in

the

MEM

position.

Notice

Memory Mode

Memory Capacity

SAVE mode

500

LOG mode

1000

COMP mode

1000

- 20 -

In

MEM

function,

each

operation

could

only

read

or

clear

the

data

of

one

storing

part.

2. Turn the rotary switch to the MEM position and “ ” displays on the screen.

3. Press p ushbutton

to

select a storing data.

Press for saved reading, “ MEM

MEM

” appears in the display.

Press for logged reading, “ LOG

LOG

” appears in the display.

Press for comparative reading, “ COMP

COMP

” appears in the display.

4. Press

or to

view the sequent

or

the previous recording.

5. Turn the rotary switch

to

any other position

to

enter measuring mode.

Clearing

Memory

Use the following procedure to clear memory data:

1. Disconnect the input leads at the measurement source.

Warning

To

avoid

electric

shock,

disconnect

the

test

leads

when

the

rotary

switch

is

in

the

MEM

position.

Notice

In

MEM

function,

each

operation

could

only

read

or

clear

the

data

of

one

storing

part.

2. Turn the rotary switch to the MEM position.

3. Press p ushbutton

to

select a storing data

to

clear.

Press

to

clear saved reading, “ MEM

MEM

” appears in the display.

Press

to

clear logged reading, “ LOG

LOG

” appears in the display.

Press

to

clear comparative reading, “ COMP

COMP

” appears in the display.

4. Press for more than 2S, “ ” appears in the display and press again

to

clear the type of memory presently ; or else

press

to

cancel.

Using

Communications

Notice

Make

sure

your

PC

has

been

connected

with

the

earth

ground

when

employing

this

function.

When using a PC-to-meter IR (infrared) communication link, refer to the DMM VIEW_A Software Guide or the on line help.

You can use the USB to UART Bridge Controller and DMM VIEW_A software to transfer the contents of a meter to a PC.

Victor 98A User manual

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