background image

capacitance)

 

Notes:

 

 

If

 

the

 

tested

 

capacitor

 

is

 

shorted

 

or

 

its

 

capacity

 

is

 

over

 

the

 

specified

 

range

 

“OL”

 

symbol

 

will

 

be

 

displayed

 

on

 

the

 

screen.

   

 

When

 

measuring

 

large

 

capacitors,

 

it

 

may

 

take

 

a

 

few

 

seconds

 

to

 

obtain

 

steady

 

readings.

 

 

Before

 

measuring

 

capacitors

 

(especially

 

for

 

high

 

voltage

 

capacitors),

 

please

 

fully

 

discharge

 

them.

   

6.

 

Frequency/Duty

 

ratio

 

measurement

 

(see

 

figure

 

8)

 

 

At

 

the

 

frequency

 

position,

 

press

 

the

 

Hz/%

 

to

 

select

 

frequency/duty

 

ratio

 

measurement

 

mode.

 

Notes:

 

 

Do

 

not

 

input

 

voltage

 

over

 

DC

 

60V

 

or

 

AC30V.

 

7.

 

Temperature

 

measurement

 

(see

 

figure

 

9)

 

Turn

 

on

 

the

 

device,

 

after

 

“OL”

 

symbol

 

appears,

 

insert

 

K

thermocouple

 

into

 

the

 

device.

   

Note:

 

Only

 

K

type

 

thermocouple

 

is

 

applicable.

 

The

 

measured

 

temperature

 

should

 

be

 

less

 

than

 

230

˚

C/

 

446

˚

F

 

(

˚

F=

˚

C*1.8+32)

 

 

8.

 

AC/DC

 

current

 

measurement

 

(see

 

figure

 

10)

 

Connect

 

test

 

leads

 

with

 

the

 

tested

 

circuit

 

in

 

series.

 

Readings

 

under

 

this

 

AC

 

measurement

 

is

 

true

 

RMS.

 

Notes:

 

 

Before

 

measuring,

 

switch

 

off

 

the

 

power

 

supply

 

of

 

the

 

circuit.

 

 

If

 

the

 

range

 

of

 

the

 

measured

 

current

 

is

 

unknown,

 

select

 

the

 

maximum

 

range

 

and

 

then

 

accordingly

 

reduce.

 

 

There

 

are

 

fuses

 

inside

 

10A

 

jack

 

and

 

mA/

μ

A

 

jack.

 

Do

 

not

 

connect

 

the

 

test

 

leads

 

with

 

any

 

circuits

 

in

 

parallel.

 

 

If

 

the

 

tested

 

current

 

is

 

over

 

5A,

 

each

 

measurement

 

time

 

should

 

be

 

less

 

than

 

10

 

seconds

 

and

 

the

 

next

 

test

 

should

 

be

 

after

 

15

 

minutes.

 

 

When

 

measuring

 

AC

 

current,

 

press

 

Hz/%

 

button

 

to

 

display

 

AC

 

frequency

 

or

 

duty

 

ratio.

 

 

60A

 

AC

 

and

 

DC

 

current

 

clamp

 

measurement

 

(see

 

figure

 

11)

 

 

Connect

 

as

 

shown

 

with

 

the

 

attached

 

current

 

clamp.

 

9.

 

NCV

 

measurement

 

(see

 

figure

 

12)

 

1

 

Switch

 

the

 

dial

 

to

 

NCV

 

position

 

Содержание 72-7780

Страница 1: ...True RMS Digital Multimeter Model 72 7780 User Manual ...

Страница 2: ... 2 Do not use the device if the device or test leads appear damaged or if you suspect that the device is not operating properly Pay particular attention to the insulation layers 3 To avoid false reading replace the battery when the battery indicator appears 4 Functional dial should be switched to proper position 5 Never input voltage and current exceeding the value listed on the device 6 Do not sw...

Страница 3: ...rs 1 Range Auto Manual 2 Polarity Auto 3 Display updates 2 3 times for every second Overrange Indicator OL 4 Operating temperature 0 C 40 C 32 F 104 F Storage temperature 10 C 50 C 14 F 122 F Relative humidity 75 at 0 C 30 C 50 at 30 C 40 C 5 Operating altitude 0 2000m 6 Battery type AA R6P 1 5V 2 7 Low power indicator 8 Dimension 175mm 80mm 48 5mm 9 Weight 350g batteries included 10 Electromagnet...

Страница 4: ...t of resistance Hz kHz MHz Unit of frequency Unit of duty ratio mV V Unit of voltage μA mA A Unit of current nF μF mF Unit of capacitance C Celsius degree F Fahrenheit degree NCV Non contact voltage Auto shutdown Current clamp VIII Functional dial and buttons Position Note V V mV AC DC voltage Ω Resistance Diode Continuity Capacitance Hz Frequency Duty ratio C F Temperature μA mA A AC DC current 6...

Страница 5: ...the button once to hold the reading Press again to unlock the reading and enter general measurement modes IX Operation instructions To avoid false reading replace the battery if the battery low power symbol appears Also pay special attention to the warning sign besides the test lead housing indicating that the tested voltage or current must not exceed the values listed on the device 1 AC DC voltag...

Страница 6: ...ice before measuring continuity switch off all power supplies and fully discharge all capacitors Do not input voltage over DC 60V or AC30V 4 Diode measurement see figure 6 OL symbol appears when the diode is open or polarity is reversed For silicon PN junction normal value 500 800mV 0 5 0 8V Notes Switch off the power supply to the circuit and fully discharge all capacitors Voltage for testing dio...

Страница 7: ...e The measured temperature should be less than 230 C 446 F F C 1 8 32 8 AC DC current measurement see figure 10 Connect test leads with the tested circuit in series Readings under this AC measurement is true RMS Notes Before measuring switch off the power supply of the circuit If the range of the measured current is unknown select the maximum range and then accordingly reduce There are fuses insid...

Страница 8: ...l will disappear with one long beep Recover the auto off function by restarting the device Buzzer notification 1 Input voltage 600V AC DC buzzer will continuously beep indicating measure range is at limit 2 Input current 10A AC DC buzzer will continuously beep indicating measure range is at limit Low power warnings Voltage of the battery 2 4V symbol appears the device can still be used If voltage ...

Страница 9: ...ee range 5 100 of the range shorted circuit allows least significant digit 10 Crest factor at Max range 3 0 excluding 600V range crest factor 1 5 Max input voltage 600Vrms 3 Resistance measurement Range Resolution Accuracy 600 0Ω 0 1Ω 1 0 2 6 000kΩ 0 001kΩ 0 8 2 60 00kΩ 0 01kΩ 600 0kΩ 0 1kΩ 6 000MΩ 0 001MΩ 1 2 3 60 00MΩ 0 01MΩ 1 5 5 Measurement result reading of resistor reading of shorted test le...

Страница 10: ...or frequency measurement 100kHz Notes When measuring AC voltage or current following conditions should be satisfied Frequency response 1kHz AC voltage mV position 100mV V position Range 6 AC current input range 4000 6000μA 400 600mA 10A A range 6 400 600μA 40 60mA 4 6A A range 60 7 Temperature Range Resolution Accuracy C 40 1000 C 40 0 C 1 C 3 0 100 C 1 0 3 100 1000 C 2 0 3 F 40 1832 F 40 32 F 1 F...

Страница 11: ...e opening the rear cover switch off the power supply remove test leads from the input terminal and the circuit 1 General maintenance 1 Clean the case with a damp cloth and detergent Do not use abradants or solvents 2 If there is any malfunction stop using the device and send it to maintenance 3 The maintenance and service must be implemented by qualified professionals or designated departments 2 R...

Страница 12: ...e teat leads from the input terminal 2 Loosen the both screws on the rear cover and then remove the rear cover to replace the fuse Fuse specification F1 Fuse φ6 32mm FF 600mA H 600V F2 Fuse φ6 25mm FF 10A H 600V Tenma Test Equipment 405 S Pioneer Blvd Springboro Oh ...

Отзывы: