EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: hugos31 on May 25, 2014, 10:20:21 pm
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hello friends. accidentally; 24vdc introduced in CH1. currently; (channel 1). not emit signal. only sale-15v dc ..,,,,,,,,,,,,I keep track of the output circuit (channel 1) I found chip output signal (8-pin smd) with aluminum heatsink, id code cleared (scraped),,,, Please i need code? for reeplazar
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(http://i.imgur.com/YUThxW5.jpg) (http://i.imgur.com/Q7eHwbs.jpg)
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We know what the front panel looks like - take a picture of the circuit around the chip!
It's probably just a high output current, somewhat high speed, high slew rate op amp. Check how it's connected. You might be able to substitute without knowing the part number.
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(http://i.imgur.com/t5nV2bO.jpg) (http://i.imgur.com/Ss1ZBfq.jpg) id code cleared (scraped),,,, test: +15v and ; -15v
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Yeah, I'm pretty sure that's just an op amp. You're looking for something in the neighborhood of an LM7171 (http://www.ti.com/product/lm7171), but with a thermal pad on the bottom.
Double-check that it's actually failed, though. Put it back in circuit, leave off the heat sink, set to a large output amplitude but do not terminate the output (the goal is to have zero current draw - nothing through the attenuators, as there would be at small amplitude, and nothing out the BNC - in which case it shouldn't need the sink), at low frequency. Probe the inputs and see if it behaves like an op amp.
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:-+ . ok I test lm7171
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No, please don't actually use an LM7171 - I said to find something with a thermal pad. That's just a bit too much heat for a 7171 (which is not available in a high power package).
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http://www.ti.com/lit/ds/symlink/opa541.pdf (http://www.ti.com/lit/ds/symlink/opa541.pdf)
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OPA541 ???. Please review the datasheet you posted.
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OPA551 https://www.futurlec.com/Linear/OPA552UA.shtml (https://www.futurlec.com/Linear/OPA552UA.shtml) :-// +- 30v is problema,,,,,,,,,,,,,can be opa454........http://www.ti.com/lit/ds/symlink/opa454.pdf (http://www.ti.com/lit/ds/symlink/opa454.pdf)
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Compare the slew rate and gain bandwidth of the opa541 or 454 to the lm7172. The opa541 is not even the correct package.
Have you tested the opamp yet?
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? :-//
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? :-//
How difficult is is ask from Rigol? They perhaps have today some kind of customer care and service help?
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THS3095 is the original IC
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I wonder if hugos31 has reeplazared the OpAmp yet.
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Hello everybody
There is an inductor in output section of DG1022, it has been crashed, is anyone know how the value is?
https://imgur.com/gallery/DzgQTzB
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Hello everybody
There is an inductor in output section of DG1022, it has been crashed, is anyone know how the value is?
https://imgur.com/gallery/DzgQTzB (https://imgur.com/gallery/DzgQTzB)
It's a common mode choke and the exact replacement part number is ACM4532-901-2P. A while back, I blew the same choke in mine as well. Since it was difficult to find that exact one at the time, I used a close replacement from Digikey - https://www.digikey.com/product-detail/en/wurth-electronics-inc/744235601/732-4221-1-ND/3672769 (https://www.digikey.com/product-detail/en/wurth-electronics-inc/744235601/732-4221-1-ND/3672769) - It has been working fine ever since.
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My friend,
appreciate 🙏