Difference between revisions of "POT4"
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[[Medialab Documentation | Documentation HOME]] | [[Medialab Documentation | Documentation HOME]] | ||
| − | ==Power Supply== | + | |
| − | + | Also see : [[POT4a]] and [[POT4b]] | |
| − | + | ||
| − | + | ==[[pot4 power supply | POT4 Power Supply]]== | |
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| + | ==[[POT4_PINOUT | POT4 Header Pinouts]]== | ||
| + | |||
| + | ==Voltage Reference== | ||
| + | |||
| + | Discussion of the [[POT2 Reference | voltage reference]]. | ||
== Identification == | == Identification == | ||
[[image:pot4_s1.jpg|right|thumb|160px|POT4]] | [[image:pot4_s1.jpg|right|thumb|160px|POT4]] | ||
| − | [[image:Rpot4-pcb-top-rev0-031505.png|right|thumb|80px| | + | [[image:Rpot4-pcb-top-rev0-031505.png|right|thumb|80px|top side]] |
| − | [[image:Rpot4-pcb- | + | [[image:Rpot4-pcb-bot-rev0-031505.png|right|thumb|80px|bottom side]] |
*POT4 is a green PCB with white silk screen. | *POT4 is a green PCB with white silk screen. | ||
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* board #9 : same as #1,#2 with INA128, Gain 1+50K/RA1 - populated for POT board | * board #9 : same as #1,#2 with INA128, Gain 1+50K/RA1 - populated for POT board | ||
| + | *8-1-05 : board #9 returned for repairs. | ||
==Design Files== | ==Design Files== | ||
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*Q: [[POTx_REFERENCE | What are the characteristics of the voltage reference?]] | *Q: [[POTx_REFERENCE | What are the characteristics of the voltage reference?]] | ||
| − | ==[[POT4 Bill of Materials]] | + | ==Bill of Materials== |
| + | |||
| + | [[POT4 Bill of Materials | Bill of Materials]] | ||
| − | ==[[POT4 Datasheets]] | + | ==Datasheets== |
| + | [[POT4 Datasheets]] | ||
Latest revision as of 20:22, 16 August 2006
Contents
POT4 Power Supply
POT4 Header Pinouts
Voltage Reference
Discussion of the voltage reference.
Identification
- POT4 is a green PCB with white silk screen.
- Dimensions 1.75" x 0.85"
- Two mounting holes (diameter = 0.125"), top side clearance > 0.25"
- The color of DL1,DL2 indicates the input configuration of the board
Led Indicators
- (DL1, DL2) : A pair of single LEDs indicate the present of power. These LEDs are aligned with the power input to the boards.
- RED : configured for potentiometer inputs (#1-2)
- GREEN : configured with bridge inputs (#3-8)
- DK1 : The intensity of this dual RED/GREEN LED indicates the voltage of the "position signal".
Jumpers
- JF1 : 3 way jumper used to select source that drives that "Position" output. The signal source may be one of the following:
- Instrumentation amplifier output
- 2nd order low pass filter output
- 4th order low pass filter output
- JC1 : selects the "Shield" header signal source and is specified at assembly time. Signal sources include "GND", "COM", or "REF-".
Assembly Variations
POT4 can be built for either potentiometer input or bridge input. There are also several optional circuit modules.
- Detailed POT4 Gain by serial #
- boards #1, #2 : fully built with lowpass filters, differentiation and configured for potentiometer input. These boards use the LT1167 with gain G=1+49.4K/RA1.
- boards #3, #4 : minimally built for strain gauge bridge input. These boards use the INA122 with gain G=5+200K/RA1. Opamp LM324, 100K trim pot
- boards #5 - #8: built for strain gauge bridge input and are minimally built with 2nd order LP filter. These boards use the INA128 with gain G=1+50K/RA1. Opamp LM324, "503" trim pot
- board #9 : same as #1,#2 with INA128, Gain 1+50K/RA1 - populated for POT board
- 8-1-05 : board #9 returned for repairs.
Design Files
- Media:Pot4-sch-rev0-031505.pdf
- Media:Rpot4-pcb-top-rev0-031505.pdf
- Media:Rpot4-pcb-bot-rev0-031505.pdf
- Media:Pot4-for-strain-gauge-boards-5to8.pdf
FAQ
- Q: How to adjust the gain?
- Q: What is pinout of the headers?
- Q: What are the characteristics of the voltage reference?
