Datasheet

GMC-I Messtechnik GmbH 19

Ð Read the resistance value on the -scale and the voltage on the V,

A scale with the 100 part graduation.

B= Basis C= Collector E= Emitter

Valuation of a diode and/or the diode path of a transistor

A diode and/or a transistor functions when the indication on the V, A

scale during a measurement in forward direction is smaller than the

indication during a measurement in reverse direction. The qualitative

behaviour and the technical data of the semi-conductor can, however,

not be judged by the degree of deflection; mainly the current gain of a

transistor is not picked up. When measuring in reverse direction, the

multimeter indicates the voltage on the diode path on the k

x 10 range

(1 V for full scale value

). The reverse current flowing thereby is the

difference between the full scale value (graduation 100) and the indica-

tion

. One graduation corresponds to 10 mV and/or 22 nA.

A diode and/or a transistor is interrupted when

 or the same value

close to

is indicated on the -scale in both directions (insulation

resistance)

. A diode and/or a transistor has a short between the con-

nection electrodes when 0 or the same value close to 0 is indicated on

the

-scale in both directions.

Measure-

ment

Diode Transistor

in on socket on socket on socket

Forward

direction

A|A| A|

Reverse

direction

 A|A| A|

NPN

PNP