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.

Victor 98A User manual

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