Other Parts Discussed in Thread: XTR111
Hi there,
I am using this Evaluation board as a standard source, as a reference for my 4-20mA.
When I use a scope to check the value, look like it is not stable. Can the peak to peak be lower?
Regards
CS
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Hi there,
I am using this Evaluation board as a standard source, as a reference for my 4-20mA.
When I use a scope to check the value, look like it is not stable. Can the peak to peak be lower?
Regards
CS
Hi CS,
Can you share more information regarding power supply voltage, signal input, output requirements, and how you've configured the jumpers (J1, J2, J3)?
Did you follow the EVM setup instructions in the guide? http://www.ti.com/lit/ug/sbou048c/sbou048c.pdf See Figure 3 for "Voltage Output Setup"
-Tamara
Hi Tamara,
I use a bench top power supply, supply 24Vdc. Then from the EVM board tap the 5V to a trim pot of 10K to send the signal to get 12mA output, measure from a bench multimeter.
Did not use any of the jumpers, open.
Look like there a small ac wave sitting on the DC. I use a load of 250 ohm.
Anyway to make this wave smaller?
Regards
CS
Hi CS,
My apologies, I mis-read your initial post. You're right, all jumpers should be open.
As you vary the pot, can you measure the min and max voltage at VIN? A test point connected to VIN is located next to TB4. I want to make sure the input voltage is within spec range.
Can you also try disconnecting the pot and just applying a DC voltage of 0-5V to the input VIN at TB4 and measuring the output IOUT at TB2? If the issue persists, we may want to try another XTR111 device. If the output is as expected, then there may be a problem with the pot.
-Tamara