HP 4276A PDF

Find great deals for HP Hewlett Packard A LCZ Meter T Shop with confidence on eBay!. Agilent HP A LCZ Meter is a general purpose Impedance measuring instrument designed to measure circuit Components such as capacitors and inductors. The HP Yokogawa (Made in Japan) LCR meters are still very useful, these are % basic accuracy LCR meters – with various test frequencies.

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And, you can apply DC bias as needed to test ceramic capacitors, diodes, etc.

HP Hewlett Packard 4276A LCZ Meter T42009

I would this meter for a marginal price, in Japan. It arrived in good overall state and well packaged, but very dirty inside. In some ranges, I get a reading but it is far off. In the corners and gaps, a wasp, and a dried frog.

Probably, this instrument has been stored in some shed? Take care of the fan hybrid, which is a thin ceramic plate — overall, a rather delicate construction. The test setup — with 4276x external 8 Volts supply. Turns out, the fan starts if we move it a bit.


Keysight Technologies (Agilent HP) A used or new for sale at used-line

Probably, some issue with the driver. A good phase — you clearly see the switching action of the transistor, grounding the phase wire for some time to move the fan forward. B15, this is a 2na equivalent transistor — watch out, there are different pinouts.

Next — we have to fix the analog circuit. This is a nice board, with several hybrids. After some difficult probing — found one bad 12 V regulator!

HP A LCR Meter: several issues, and several animals found | SimonsDialogs

It even had some traces of corrosion — maybe it was running hot or some other failure. Some test — still not working — at least not in all ranges.

Seems the input amplifier is clipping the signal. Clearly, something is wrong with the range switching. Cleaned it thoroughly with an eraser, and alcohol.

It is a really great instrument to test ceramic capacitors, and the impact of DC bias on their 4276x As a last measure, inspected all the X and Y rated capacitors — it good practice to do so with any old instrument.


These are safety capacitors, and they often fail with age and use. Your email address will not be published.

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