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Author Topic: Agilent 34970A DAQ Self-Test Error 606 (Rundown gain out of range)  (Read 7647 times)

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Offline mbendzickTopic starter

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Agilent 34970A DAQ Self-Test Error 606 (Rundown gain out of range)
« on: October 28, 2014, 10:24:33 pm »
My office has a 34970A that fails self-test with error 606, Rundown gain out of range:

"This test checks the nominal gain between the integrating ADC and the A1U205 on-chip ADC. The nominal gain is check to ±10% tolerance."

The same 606 could be reported on a 34401A (the guts of which make up the core of the 34970A as I understand it):
"This test checks the nominal gain between the integrating ADC and the U500 onchip ADC. The nominal gain is checked to ±10% tolerance."

Anyone have ideas on how fixable this might be?  What would this kind of failure show up as in measurements?
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Offline PTR_1275

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Re: Agilent 34970A DAQ Self-Test Error 606 (Rundown gain out of range)
« Reply #1 on: May 01, 2015, 10:24:32 am »
Did you have any luck with this one?? I have been seeing a few 34970 coming up for sale with the same error. Not sure if it is worth buying them or not.
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Offline free_electron

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Re: Agilent 34970A DAQ Self-Test Error 606 (Rundown gain out of range)
« Reply #2 on: May 05, 2015, 11:10:05 pm »
Rundown gain is typically a prblem in the current switching hybrid. 150$ a pop ...
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Offline mbendzickTopic starter

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Re: Agilent 34970A DAQ Self-Test Error 606 (Rundown gain out of range)
« Reply #3 on: May 21, 2015, 03:59:26 pm »
free_electron - please help me avoid the curse of the Wisdom of the Ancients (https://xkcd.com/979/) by offering me a little more information...

Could you clarify which component on which board is the "current switching hybrid" ?  The service guide for the 34970A has schematics and is at https://www.keysight.com/main/gated.jspx?lb=1&gatedId=258467&cc=US&lc=eng&parentContId=1000001313:epsg:pro&parentContType=pt&parentNid=-33261.536881544&fileType=VIEWABLE .

Based on your replies at https://www.eevblog.com/forum/testgear/got-myself-an-agilent-34401a-with-a-label-%27not-working%27-on-it/ , is it the "1NB4-5035" "CUST R NET PKG" loaded at U102?

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Offline mbendzickTopic starter

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Re: Agilent 34970A DAQ Self-Test Error 606 (Rundown gain out of range)
« Reply #4 on: June 10, 2015, 05:01:18 pm »
Are there places to order the hybrid at places besides Keysight's' find-a-part at www.keysight.com/my/faces/fapHomePage.jspx ?
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Offline ItIsJustMe

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Re: Agilent 34970A DAQ Self-Test Error 606 (Rundown gain out of range)
« Reply #5 on: October 03, 2019, 01:12:27 pm »
Just fixed one 34970A with 606 self-test error by replacing P100 ribbon cable.

Google service note 34970A-14C for more information.
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Offline shaohu.tang

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Re: Agilent 34970A DAQ Self-Test Error 606 (Rundown gain out of range)
« Reply #6 on: October 12, 2021, 11:22:23 am »
I have repaired a 606 error failure of an Agilent 34401 multimeter. After replacing u420 and u402, it is ok.
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Offline shaohu.tang

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Re: Agilent 34970A DAQ Self-Test Error 606 (Rundown gain out of range)
« Reply #7 on: October 13, 2021, 09:46:47 am »
Picture before repair。
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Offline shaohu.tang

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Re: Agilent 34970A DAQ Self-Test Error 606 (Rundown gain out of range)
« Reply #8 on: October 13, 2021, 09:56:32 am »
Picture after repair  。
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Online HighVoltage

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Re: Agilent 34970A DAQ Self-Test Error 606 (Rundown gain out of range)
« Reply #9 on: October 13, 2021, 10:52:13 am »
What you repaired seems to be a 34401A and not a 34970A

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Offline shaohu.tang

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Re: Agilent 34970A DAQ Self-Test Error 606 (Rundown gain out of range)
« Reply #10 on: October 13, 2021, 11:03:59 am »
Yes, it is 34401A. Others say it has many parts the same as 34970A.
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Offline voltsandjolts

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Re: Agilent 34970A DAQ Self-Test Error 606 (Rundown gain out of range)
« Reply #11 on: October 13, 2021, 11:22:36 am »
Quote from: shaohu.tang on October 13, 2021, 09:56:32 am
Picture after repair

Can you confirm you replaced two ICs, AD711 and OP27 ?

As seen here in the 34970A:
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Offline shaohu.tang

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Re: Agilent 34970A DAQ Self-Test Error 606 (Rundown gain out of range)
« Reply #12 on: October 13, 2021, 11:52:00 am »
Quote from: voltsandjolts on October 13, 2021, 11:22:36 am
Quote from: shaohu.tang on October 13, 2021, 09:56:32 am
Picture after repair

Can you confirm you replaced two ICs, AD711 and OP27 ?

As seen here in the 34970A:


yes .
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