National Instruments NI 4050 用户手册

© National Instruments Corporation

Figure 1-5.  Connections for Resistance Measurement

2.

Select 2-wire resistance mode.

3.

Select the range for your measurement—200 

Ω

, 2 k

Ω

, 20 k

Ω

, 200 k

Ω

, 

2 M

Ω

, 200 M

Ω

, or autorange.

The value indicator indicates the resistance measured. See the 

 section of Chapter 2, 

, for 

more information on 2-wire resistance measurements.

The NI 4050 can excite a device under test and read the resulting voltage 
drop. Diode mode is useful for testing diodes. Use the following procedure 
to measure the forward drop across a diode. Voltage up to 2 V can be 
measured in this mode.

1.

Connect the test probes to a diode as shown in Figure 1-6. To 
accurately measure the forward voltage of a diode, make sure that the 
diode is not connected to any other circuits. The NI 4050 biases the 
diode with a current of 100

µ

A and measures the resulting voltage 

drop. Diode measurements are made with a fixed range of 2.0 V.

Figure 1-6.  Connecting Signals for Diode Test

Resistor

250 V
MAX.

LO

HI

Diode

+

–

100 

µ

A

250 V
MAX.

LO

HI