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How to connect the function generator with the laod?

Question asked by surajkumar on Feb 21, 2012
Latest reply on Feb 23, 2012 by algoss

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I am new to DSOX2024A built in function generator. I want to connect a load to the wavegen output. I set the wavegen as PULSE wave-250Hz-5Vpp-width(2ms). when I check this output with the DSO, I could see the perfect PULSE wave-250Hz-5Vpp-width(2ms). But when I try to connect the load to the wavegen output. I couldn't see the pulse wave in the DSO I could see only the fully OFF signal(0V), I am using the Agilent N2863B 300 MHz PASSIVE PROBE.

Please suggest me the best way to connect the function generator to the load.

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algoss Feb 21, 2012 12:58 PM
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What is the load you are using, and what is the output impedance set to? They have to match.

Output impedance 1M, no load - Full voltage
Output impedance 1M, 50 Ohm load - Very small voltage
Output impedance 50 Ohm, no load - Double voltage
Output impedance 50 Ohm, 50Ohm load - Full voltage

Al
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surajkumar Feb 22, 2012 7:45 AM
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The load (board) is a black box for me. I don't know anything about the impedance of the board. Just I was instructed to connect the PWM signal to one of the board input. I have tried with function generator's both output impedance setting (50 ohm & HIGH impedance) but function generator behavior is same. i.e. I couldn't see the pulse wave in the DSO. I could see only the fully OFF signal (0V) without powering the board and the fully ON signal (VCC level) on powering the board in DSO on the Function Generator output.

Please let me know whether the issue is with the board or with function generator.
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algoss Feb 22, 2012 1:07 PM
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Please send more information. Draw a schematic and attach it to your reply. Send scope screen shots, if appropriate. Take a picture of your setup, and attach it to your post.

Al
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surajkumar Feb 29, 2012 12:25 PM
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I am attaching the block diagram of the test setup and snapshots of the testbench. I am not having the schematic of the board. Please let me know the fix for this issue.
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- DSCN0348.JPG681.8 KB
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algoss Feb 23, 2012 2:14 PM
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I see your problem. Scope probes are for probing. They are for getting data into the scope.You cannot connect them to the WaveGen output.

Depending on the requirements of your target, you will need some sort of BNC cable to get the signal from the scope to your target.

Al
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surajkumar Feb 23, 2012 3:10 PM
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Thank you for the answer. I didn't receive any other cable to connect the Wavegen output. I received only the 4 scope probes for the 4 channels. Please suggest the best BNC connector to connect the wavgen output with the load. Just I want to generate 200Hz to 300Hz PWM signals from the wavegen.
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algoss Feb 23, 2012 4:17 PM
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The cable you need depends on what the physical connection looks like on the input to your target.

If you have never used a signal generator before, find someone who has, and get their help. You're going to need help programming the WaveGen to produce PWM signals anyway.

Al
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How to connect the function generator with the laod?

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