Author Topic: HP 4274A LCR Meter - mini teardown  (Read 21176 times)

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Offline MateKrisz

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Re: HP 4274A LCR Meter - mini teardown
« Reply #50 on: June 05, 2018, 05:06:28 am »
Hi,

Thank you the useful informations! I measured the power board output voltages, and I found some not normal voltage value. The left side is working good, but the +44, -44, -22 exactly not. I used the common GND point.




I ordered a B+K TL89F1 fixture. (https://hu.mouser.com/ProductDetail/BK-Precision/TL89F1/?qs=CjgjetG5vV4ukiCCEHhtpw==)
It can:
Test fixture for convenient testing of axial and radial leaded type components.

Frequency: DC to 10MHz
DC Bias:+/- 40V peak max (AC+DC)
Operating Temperature: 0 to 40 degrees C
Terminal Connection: BNC to 4 terminal insertion slots (radial or axial)

Well, yesterday I bought on the eBay a 16023B bias controller ( https://www.ebay.com/itm/HP-Agilent-Keysight-16023B-bias-controller/273240404664 )

I think with bias controller, they can work together the 100V bias board and the 40V fixture.

I measured the osc level and freq on the H cur BNC socket, and seems to be ok.

I attached a catalog sheet from '79 catalog.
 
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Offline 3g57

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Re: HP 4274A LCR Meter - mini teardown
« Reply #51 on: June 05, 2018, 05:14:29 am »
Hi! do not rush into conclusions about the common wire
for -44 and +44. At them it another. Look at the diagram.
You can measure the voltage across the capacitors С5,С6.
_____________
question:
Measured with load?
Measure under load on capacitor contacts.

I marked GND & W3 Pin 2,3



Only measure with load  All points !!!!
« Last Edit: June 05, 2018, 05:46:28 am by 3g57 »
 

Offline MateKrisz

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Re: HP 4274A LCR Meter - mini teardown
« Reply #52 on: June 05, 2018, 05:44:30 am »
Hi,

Yes, now I see the GND. I remeasured but nothing changed.  :/
Yes I measured with load, the fully unit is working.

« Last Edit: June 05, 2018, 05:46:12 am by MateKrisz »
 
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Offline 3g57

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Re: HP 4274A LCR Meter - mini teardown
« Reply #53 on: June 05, 2018, 05:50:25 am »
Slightly understated +12 and -12.
Will pass through the tires and the board will be even smaller.
Better in the power supply a little more but always symmetrically !!!
« Last Edit: June 05, 2018, 05:53:34 am by 3g57 »
 

Offline MateKrisz

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Re: HP 4274A LCR Meter - mini teardown
« Reply #54 on: June 05, 2018, 05:56:12 am »
Yes, but I have the original R3 and I wanna replace to multi-turn.
Do you have idea why bigger the +-44 and -22 voltages?
Before CR-13, CR-14 I measured 49,2 AC Volts. How?
 

Offline 3g57

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Re: HP 4274A LCR Meter - mini teardown
« Reply #55 on: June 05, 2018, 06:01:52 am »
Check the AC switch on the rear panel
device power supply voltage? 220/240 ???

If you have 220AC, then you can safely put
on 240VAC. Just do not make a mistake!
Then measure.

Take off R3.
Measure the resistance !!!
On the new install the same.
Only then install it!
« Last Edit: June 05, 2018, 06:09:24 am by 3g57 »
 

Offline MateKrisz

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Re: HP 4274A LCR Meter - mini teardown
« Reply #56 on: June 05, 2018, 06:12:35 am »
Yes of course, because when arrived from US the first thing was that I swicthed from 120 to 220V.
I have transformator I can use it 120V too.

 

Offline 3g57

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Re: HP 4274A LCR Meter - mini teardown
« Reply #57 on: June 05, 2018, 06:16:38 am »
A transformer is not needed.
Switch to 240VAC and measure now the voltage points!
___________________________
« Last Edit: June 05, 2018, 06:39:35 am by 3g57 »
 

Offline MateKrisz

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Re: HP 4274A LCR Meter - mini teardown
« Reply #58 on: June 05, 2018, 06:41:46 am »
I switched up to 240V the primer. OMG what a collection!!! :D Grats! :)
Try it on 120V? Maybe....
Well the results:

« Last Edit: June 05, 2018, 06:45:23 am by MateKrisz »
 

Offline 3g57

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Re: HP 4274A LCR Meter - mini teardown
« Reply #59 on: June 05, 2018, 06:44:56 am »
Is the tension closer to the truth?
Check the work for a mistake! Er4
« Last Edit: June 05, 2018, 06:47:21 am by 3g57 »
 

Offline MateKrisz

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Re: HP 4274A LCR Meter - mini teardown
« Reply #60 on: June 05, 2018, 06:47:59 am »
Yes, but +44 and other still high yet. Try on 120V?
ERR 4 message still flashing yet.
« Last Edit: June 05, 2018, 06:52:08 am by MateKrisz »
 

Offline 3g57

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Re: HP 4274A LCR Meter - mini teardown
« Reply #61 on: June 05, 2018, 06:52:47 am »
Do not need a transformer.
This is already normal. :)

Wait for the purchase!
Then you will look.
Your entrance is open.

But still there is a problem!

Show more download videos.
At the same time, reduce the frequency to 10 kHz  x1
« Last Edit: June 05, 2018, 07:04:06 am by 3g57 »
 

Offline MateKrisz

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Re: HP 4274A LCR Meter - mini teardown
« Reply #62 on: June 05, 2018, 06:54:42 am »
The +12V on +44 it is normal? :)
 

Offline MateKrisz

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Re: HP 4274A LCR Meter - mini teardown
« Reply #63 on: June 05, 2018, 07:00:35 am »
Ok, I wait both item. I hope will arrive in this week.
 
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Offline 3g57

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Re: HP 4274A LCR Meter - mini teardown
« Reply #64 on: June 05, 2018, 07:22:59 am »
It's late. I'm going to sleep.
Best regards!
 

Offline MateKrisz

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Re: HP 4274A LCR Meter - mini teardown
« Reply #65 on: June 05, 2018, 07:30:17 am »
Ok, I still bundle the tools. Thanks your help! Good night! :)

 

Offline 3g57

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Re: HP 4274A LCR Meter - mini teardown
« Reply #66 on: June 06, 2018, 08:24:13 pm »
I wrote that the HP4275A worked without problems. And here is the problem. Breached the resolution of switching voltage 16023B BIAS CONTROLLER. The fault wasOctal D Flip−Flop with Clear. After the replacement, the normal work resumed.



3g57
« Last Edit: June 06, 2018, 10:26:23 pm by 3g57 »
 

Offline 3g57

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Re: HP 4274A LCR Meter - mini teardown
« Reply #67 on: June 07, 2018, 04:54:15 am »
MateKrisz! Hi!
Have you drawn a scheme of a secret casket? :palm:
 

Offline MateKrisz

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Re: HP 4274A LCR Meter - mini teardown
« Reply #68 on: June 07, 2018, 04:58:38 am »
Hi,

I hope all well with your 4275A!
My packages on the way, I waiting... :) What asking?
 

Offline 3g57

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Re: HP 4274A LCR Meter - mini teardown
« Reply #69 on: June 07, 2018, 05:14:33 am »
Everything is normal! LS - the series is weak. Unreliable.
ALS is much better.
Therefore also has died.  ;)
 

Offline MateKrisz

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Re: HP 4274A LCR Meter - mini teardown
« Reply #70 on: June 07, 2018, 05:21:49 am »
It is not sounds good, can I help you? :)
 
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Offline 3g57

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Re: HP 4274A LCR Meter - mini teardown
« Reply #71 on: June 07, 2018, 07:21:43 am »
MateKrisz! I will draw Extender boards.
I think the HP4275A needs to be calibrated.









3g57
 

Offline MateKrisz

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Re: HP 4274A LCR Meter - mini teardown
« Reply #72 on: June 07, 2018, 07:37:28 am »
Hi,
It is interest, never seen before.  And what extend with this board?
 

Offline 3g57

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Re: HP 4274A LCR Meter - mini teardown
« Reply #73 on: June 07, 2018, 07:46:07 am »
This was done for NIKON equipment.
I will do this for the HP4275A.
This one does not fit.

3G57
 

Offline MateKrisz

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Re: HP 4274A LCR Meter - mini teardown
« Reply #74 on: June 07, 2018, 07:43:14 pm »
MateKrisz! Hi!
Have you drawn a scheme of a secret casket? :palm:

Yes, I will send you at tonight.

Krisz
 
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