3-1/2 Display is just enough resolution for recording process
data or troubleshooting equipment. With 4-1/2 you notice the
problems of thermoelectric EMF of probes and connectors. That
is one reason gold plating is used another being low contact
resistance. In 4 1/2 the reading can change due to contact
resistance too, if the input impedance of the analog signal
conditioning is low or the protection diodes, RC filter caps
The basic application Note is from Intersil - ICL7107 Device
Information. When you measure an analog parameter from a
sensor; you attenuate or amplify it, to scale to the A/D
converter range. You also need to protect or isolate the
analog front end from high energy mis-connections, which will
happen during field use. The operator should not get injured
from any high energy leakage while measuring.
Resolution is the finest detail you can enumerate in a parameter
or object. You can say the crowd was 3000 or 4000 people. Here
1000 is the resolution, finer data does not matter here.
The PNGs of PCB is 600dpi 16 color. It is to be scaled appropriately. The part numbers on circuit may not match the Silk Screen.
20th Mar 2020
The documents, software, tools and links are provided to enhance the ability of an electronics student, hobbyist or professional by sharing information. The information, links etc. should be used by the website visitor, at his or her own risk and responsibility. There may be concept, design and link errors in the pages.
Creative Work, ideas and documents of delabs can be used for Product Design and Development by R&D Engineers, Hobbyists, Students and even firms for creating useful products. These cannot be used for reprint, replication or publishing online or offline.