SGA01 User Manual
The Solid-Motion SGA01 is designed to amplify and filter
small voltage and current sensor output signals, such the output
signals from a strain gauge or pressure sensor. The output of the SGA01 ranges
from 0 to 10V and may be connected to an analog-to-digital converter
(ADC), such as a Dataq, for digitization and display on a PC.
A battery voltage of anywhere from 12V to 24V may be used to power the
SGA01 and battery connections for two 9V batteries are already assembled
on the board.
Features
- Available in any gain from 1 to 1000. Stock gains listed above
- Available in any bandwidth from 1 to 10KHz. Stock bandwidths
listed above
- 2-pole butterworth output filter
- Very low noise. Less than 0.5LSB into a 12 bit ADC
- 10V excitation voltage with continuous short-circuit current
limiting
- High impedance 1 Megohm differential input
- 10ppm low TC gain setting resistor
- 0-10V output. 0-5V output also available
- Diode protected battery connection. Accidently reversing the
supply connection won't destroy the amplifier
- High quality Phoenix terminal block connectors
- Supply voltage 12V to 24V
- Custom gains and bandwidths on request.
back to top Specifications
| AMPLIFIER |
|
Gain/sensitivity |
See order info |
 |
|
Bandwidth |
See order info |
|
|
Input voltage range |
10V/gain |
|
|
Output voltage range |
10V |
|
|
Maximum input voltage |
±40V |
|
|
Input impedance |
1 Megohm |
|
|
Nonlinearity |
±0.01% |
|
|
Gain tempco |
±100ppm/ºC |
|
|
Offset voltage drift |
(gain)x(±2µV/ºC) |
| EXCITATION VOLTAGE |
|
Voltage error |
±0.5% |
|
|
Voltage drift |
±35ppm/ºC |
|
|
Excitation current (max in linear range) |
40mA |
|
|
Excitation current (short circuit) |
(gain)x(±2µV/ºC) |
back to top SGA01 Connections
1. Hook up the sensor as indicated. Note that while the SGA01 provides
common
mode rejection, it does not provide signal isolation. In other
words, the input
ground and the output ground are connected and at the same potential.
2. Hook up a 12V to 24V power source. Two 9V batteries wired in
series can be
used. After power is applied, 10V should appear on the +Excitation
terminal on
the input.
3. Hook up the ADC reference to pin 2 of the output. Hook the ADC
input to pin 4
(Meas).
back to top
Schematic
back to top
Troubleshooting
If no signal shows up in the Dataq oscilloscope with a weight on the
load cell try these
fixes:
1. Make sure the supply voltage is at least 12V.
2. Is there ~10V excitation voltage? If not check to make sure the excitation
output
isn’t shorted.
3. Try reversing the + and – sense leads of the load cell. Sometimes
load cells are
mismarked.
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