I test the temperature coefficient / stability of the TL431 current reference for my multimeter reference check.
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The TL431 is a voltage reference that can be configured as a current shunt with a transistor and two resistors to give a constant current reference over a fairly wide voltage range....this checks the stability over a wide temperature range.
The specs for my voltage / current reference IC,TL431ACLP 2.495-36V :
Initial Accuracy 1%
Maximum Input Voltage 37V
Maximum Operating Temperature 70°C
Maximum Temperature Coefficient 34ppm/°C
Minimum Operating Temperature 0°C
Mounting Through Hole
Output Voltage 2.495 → 36
Pin Count 3
Product Height 3.68mm
Product Length 4.83mm
Product Width 3.43mm
Reference Type Adjustable
Supplier Package TO-92
Topology Shunt

Other equipment used or mentioned in this video:
* Metrix MTX 3282 graphical multimeter
* Precision resistors
* NPN transistor
* Fluke 8846A 6.5 digit precision calibrated bench multimeter
* HP / Agilent 3457A 6.5 / 7.5 precision calibrated bench multimeter
* 9 volt battery, 1.5 volt lithium batteries
* Electroincs tutorial to start soon.

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