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3-1/2 Digit DPM ICL7107 Digital Panel Meter This is a Digital Panel Meter based on ICL7107.
This was the workhorse Digital Readout chip before Low power uC designs
were developed. Even now it is the easiest way an analog parameter can
be displayed in an instrument. 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 are
leaky. The PNGs of PCB is 600dpi 16 color. It is to be scaled
appropriately. |
| PNG-Schematic, PDF-Circuit, PCB - DT L1 SS SM |
| 3-1/2 Digit DPM ICL7107 Digital Panel Meter - del30002 |
| PNG
Image Can be
Scrolled by Drag-Drop Left-Click-Mouse, PDF Requires Adobe
Acrobat Reader Plugin. |
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The part numbers on circuit may not match the Silk Screen. 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. You would also hear things like, there were 80 to 90 boys in that classroom. 10 is the resolution there. Accuracy is how precise a statement or number is. If there was 85 boys in that class, the above statement is accurate. If there was 65 boys, the measuring method or process needs calibration or examination. In this circuit, the plastic caps should be of very low leakage. Multilayer plastic caps are good for instrumentation. Related Resources -
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