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oao
Newbie
Joined: 24 Jan 2007
Posts: 1
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 Posted: Wed Jan 24, 2007 3:35 pm Post subject: DrDAQ external input |
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I'm trying to connect to the DrDAQ external input. I understand that the manual shows the pin numbers from left looking towards the card, component side up. Using the PicoScope I observe noise when I touch pin 3 (Auto detect) but not when I touch pin 1 (signal). The Y-axis is set to Ext1 x1.
When I connect a 1.5V battery between pin 1 and 2 I see no change in the scope trace (stays at zero), when I connect 3 and 2 I get a reading of about 100. I do not use a auto scale resistor.
I have two questions: Do I understand the no 1 pin position of the external connector correctly?
Why do I get a reading of 100 when the input voltage is about 1.5V? |
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ziko
Site Admin
Joined: 01 Dec 2006
Posts: 596
Location: St Neots
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| Posted: Tue Jan 30, 2007 3:33 pm Post subject: |
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Hi and thank you for your post.
If you want to measure a voltage, you would connect between V and Gnd, pin 1 and 4 (4 closest to parallel connector)
Pin 1 is for voltage measurements
Pin 2 is for Resistance
Pin 3 is a Digital output which can be activated if you write your own software.
Pin 4 is ground
Kind regards |
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