KNOVA KN 8056, Manual

Multimeter Basic Testing

5

The measurement ranges of DC current are:

200.0mA and 10.00A.
To measure current, do the following:
1. Turn off power to the circuit. Discharge all

    highvoltage capacitors.
2. Insert the red test lead into the mA or 10A

    terminal and the black test lead into the COM

    terminal.
3. Set the rotary switch to an appropriate

    measurement position in A     .
4. Break the current path to be tested. Connect the

    red test lead to the more positive side of the

     break and the black test lead to the more negative

    side of the break.
5. Turn on power to the circuit. The measured value

    shows on the display.
Note

• If

 the value of current to be measured is unknown,

   use the maximum measurement position (10A)

   and 10A terminal, and reduce the range step by

   step until a satisfactory reading is obtained.

• When

 DC current measurement has been

   completed, disconnect the connection between

   the testing leads and the circuit under test.

• At

 10A Range: for continuous measurement

       10 seconds and interval time between 2

   measurements greater than 15 minutes.

C. Resistance Testing

 (see figure 5)

D. Diode Testing

 (see figure 6)

          To avoid damages to the multimeter or to the

devices under test, disconnect circuit power and 

discharge all the high-voltage capacitors before 

measuring resistance.

          To avoid possible damage to the multimeter

and to the device under test, disconnect circuit

power and discharge all high-voltage capacitors 

before testing diodes and continuity.

WARNING

WARNING

figure 5

figure 6

Never attempt an in-circuit current measurement

where the open circuit voltage between terminals

and ground is greater than 60V DC or 30V AC rms.
The resistance ranges are: 200.0

Ω

, 2.000k

Ω

,

20.00k

Ω

, 200.0k

Ω

, 2.000M

Ω

 and 20.00M

Ω

.

To measure resistance, connect the multimeter as

follows:
1. Insert the red test lead into the 

Ω

 terminal and the

    black test lead into the COM terminal.

Never attempt an in-circuit current measurement

where the open circuit voltage between terminals

and ground is greater than 60V DC or 30V AC rms.
Use the diode test to check diodes, transistors, and

other semiconductor devices. The diode test sends

a current through the semiconductor junction, then

measures the voltage drop across the junction. A

good silicon junction drops between 0.5V and 0.8V.

2. Set the rotary switch to an appropriate

    measurement position in 

Ω

 range.

3. Connect the test leads across with the object

    being measured. The measured value shows on

    the display.

Note

• The

 test leads can add 0.1

Ω

to 0.2

Ω

 of error to

   the resistance measurement. To obtain precision

   readings in low-resistance, that is the range of

   200

Ω

, short-circuit the input terminals beforehand

   and record the reading obtained (called this

   reading as X). (X) is the additional resistance from

   the test lead. Then use the equation: measured

   resistance value (Y) – (X) = precision readings of

   resistance.

• When

 the resistance reading     0.5

Ω

in the

   short-circuit condition, please check for loose test

   leads or other reasons.

• For

 high resistance (>1M

Ω

), it is normal taking

   several seconds to obtain a stable reading, and it

   is better to choose shorter test lead.

• When

 there is no input, for example in open

   circuit condition, the multimeter displays “1”.

• When

 resistance measurement has been

   completed, disconnect the connection between

   the testing leads and the circuit under test.