GEK Wiki / PCU Voltage Measurement
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PCU Voltage Measurement

Page history last edited by bk 9 years, 10 months ago

Measuring 0-5V Directly

The PCU uses on-board 10-bit analog-to-digital converters (ADCs). The reference voltage is 5V.

A voltage between 0-5V volts can be directly applied to the analog input, the reading (0 to 1024) can be converted back to voltage by multiplying by 4.88 mV.

 

Measuring Higher Positive Voltages

Higher voltages can be measured by using a voltage divider. Recent PCU/GCU boards have a 100 kOhm resistor on one side of the divider pre-installed, and an appropriately sized resistor can be soldered into the other side to scale the voltage down to the native 0-5V input.

 

Measuring +/-30V

Phidgets sells a voltage measurement board (Precision Voltage Sensor - 1135) that can read +/- 30V.

Comments (2)

Andrew Schofield said

at 11:41 am on Dec 9, 2010

Bear, have you seen data acquisition products from Labjack? The firm is located in Colorado. Their stuff seems low-cost for what it is capable of doing.

bk said

at 1:38 pm on Dec 9, 2010

Hi Andy,
The LabJack looks interesting, though I haven't looked at it extensively. Depending on needs, it may be useful.
The advantage of the PCU is the onboard microcontroller, which allows for datalogging and control, independent of an attached computer.
Cheers,
Bear

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