Bedienungsanleitung Defort DMM-1000 (Seite 10 von 112) (Alle Sprachen)

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Input resistance 10 M Frequency range 40-1000 Hz.

Overload protection AC 750 V Effective value or DC

1000 V peak value (constantly in all ranges).

Display: Corrected centre point corresponds to the ef-

fective value in a sinusoidal form.)

HINT:

1. In case the voltage range is unknown, you must set

the FUNCTION switch in the highest measurement

range and then reduce the range gradually if required.

2. If the  gure «I» now appears on the display, the

measurand lies outside the range set. The FUNC-

TION switch must be switched to a higher range.

3. The maximum input voltage is 750 VAC effective

value. Higher voltages cannot be measured.

4. Proceed extremely cautiously with the measure-

ment of high voltages.

10.3 MEASURING DIRECT CURRENT (ADC)

1. Connect the BLACK lead to the COM connector

socket. Connect the RED lead to the «VmA» con-

nector socket. For measurements between 200mA

and 20 A, remove RED lead to «20 A» connector

socket.

2. Set the FUNCTION switch on the desired «A» set-

ting and connect the leads in series to the power

circuit to be measured. Observe correct polar-

ity (red is + and black is -), otherwise the display

shows a minus sign before the value. The techni-

cal current direction of the RED lead to the BLACK

lead is displayed at the same time with the current

strength.

3. Read off the value in (milli-) Ampere.

RANGE ACCURACY RES.

200 A

± 0,8% of rdg ± 1 dgt

0,1 A

2 mA 1 A

20 mA 10 A

200 mA ± 1,2% of rdg ± 1 dgt 100 A

20 A ± 2% of rdg ± 1 dgt 10 mA

Overload protection 0.2 A/250-V cut-out, 20-A-range

not protected.

HINT:

1. In case the current range is previously unknown,

you must set the FUNCTION switch in the highest

measurement range and then reduce the measure-

ment range gradually if required.

2. If the  gure «I» now appears on the display, the

measurand lies outside the set measurement

range. The FUNCTION switch must be switched to

a higher measurement range.

3. The 20 A range is not protected with a fuse. Do not,

therefore, measure for longer than 10 seconds.

10.4 MEASURINGTHE RESISTANCE ( Ohm)

1. Connect the BLACK lead to the «COM» connector

socket and the RED lead to the «VmA» connec-

tor socket. (Hint: The polarity of the red lead is then

«+».)

2. Setthe FUNCTION switch on the desired «»

measuring range.

RANGE ACCURACY RES.

200  ± 0,8% of rdg ± 3 dgt 0,1 A

200  ± 0,8% of rdg ± 3 dgt 0,1 

2 K

± 0,8% of rdg ± 1 dgt

1 

20 K 10 

200 K 100 

2 M 1 K

20 M ± 1% of rdg ±2 dgt 10 K

Overload protection 250 V DC or AC Effective value,

for maximum 15 seconds

3. Connect the measuring tips to the components to

be measured. Ensure that the component is not

linked to the other components. Do not touch the

measuring tips so as not to affect resistance val-

ues.

4. Read off the measured value in  (Ohm).

5. While measuring the resistances, current from the

internal battery is used. This current consumption

differs according to the set measurement range.

HINT:

1. n case the measurand exceeds the highest value in

the set measurement range, the display shows «I».

Select a higher measurement range. If the resist-

ance is about 1 M and higher, the measuring de-

vice can take a couple of seconds to stabilise. This

is normal in the measurement of high resistances.

2. If the input is not connected, say in a broken power

circuit, the display shows the  gure «I». This means

that the measurement falls outside the range.

3. In case the resistance to be measured is connected

to a power circuit, you must switch off the voltage

before beginning the measurement and see that all

capacitors are discharged.

10.5 DIODES MEASUREMENT

(CONDUCTING-STATE VOLTAGE)

1. Connect the BLACK lead to the «COM» connector

socket and the RED lead to the «VmA» connec-

tor socket. (Hint: The polarity of the red lead is then

«+».)

2. Setthe FUNCTION switch on the

-range and

connect the measuring tips to the diode to be

measured. In the measurement of diodes or tran-

sistors, the polarity of the measuring tips deter-

mines whether the forward direction or the blocking

direction is measured. The displayed value is the

conducting-state voltage drop.

- The tripping current is 0.8 mA.

- In case the measuring tips are not or wrongly con-

nected to the diode i.e. in the blocking direction, the

display shows the  gure I.

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