Why is there not coherent diode to 0,7 v voltage drop?

Evaluation version of Multisim11 students. In a domain controller series simple circuit with a resistance of 10 ohms and (3) in4148 diodes before biased, voltmeters through each equal tension to the diode with each diode, but when the dc supply voltage increases, the voltage at the terminals of each diode increases. A technician quiz (and the theory of diode) indicates that the tension will change not through the diodes and should stay at 0.7 to 1 diode, 1.4V 2, 2.1V through all three together, even while the supply voltage is increased, but why not Multisim reflects the basic diode theory? I use the default settings for counters and components. This was also a problem for reverse and measured from current levels of polarization tests. I'm almost never able to get the same results, as provided for in the school laboratories.

10vdc, I get 1.593V each diode

Get 3.777V each diode to 30vdc

What's the dealio?

I can I answered my own question by experimenting with the circuit. The value of 10 ohms resistance is not high enough to avoid overloading the diodes. A value more realistic of 1Kohm and tensions of 5-10 v using 3 diodes BAS16 show diode drop of tensions in the range of .691mV to .750mV. 30V even still shows a drop of .836mV diode.

So what kind of diodes would work correctly in this circuit with a resistance of 10 ohms in series and a range of 10 - 30V dc voltage? The quiz of technician stated that this circuit has a resistance of 10 ohms. Maybe it was a typo?

Tags: NI Software

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