These types of devices have been around so long they can
be found in labs wearing the hp badge. Their uselessness
40 years ago compelled me to invent the workarounds in the copper
mountain ap note.
Rick N6RK
Keysight retiree, 2014.
On 5/26/2022 12:51 PM, Brooke Clarke via time-nuts wrote:
Hi
ass-filter-tuning-using-lasertrim-chip-caps>
-John
-Original Message-
From: Bob kb8tq via time-nuts
Sent: Thursday, May 26, 2022 10:18 AM
To: Discussion of precise time and frequency measurement
Cc: Bob kb8tq
Subject: [time-nuts] Re: measuring tiny devices
EXTERNAL EMAIL: Be c
On 5/26/2022 10:24 AM, Lux, Jim wrote:
https://www.mwrf.com/technologies/test-measurement/article/21849791/copper-mountain-technologies-make-accurate-impedance-measurements-using-a-vna
describes the various approaches
I don't know how long these methods have been in use, but I
Hi Ed:
You might surf the Accessories Catalog for Impedance Measurements.
https://www.keysight.com/us/en/assets/7018-06727/brochures/5965-4792.pdf
They have a number of SMD fixtures for 4-terminal pair LCR meters.
https://prc68.com/I/Z.shtml#KeyDocs
--
Have Fun,
Brooke Clarke
quency measurement
Cc: Bob kb8tq
Subject: [time-nuts] Re: measuring tiny devices
EXTERNAL EMAIL: Be careful with attachments and links.
Hi
The real answer to the problem is to dig into the bowels of 1940’s electronic
craft.
There are various methods for setting up an L/C filter. You short this
On 5/26/22 8:18 AM, Bob kb8tq via time-nuts wrote:
Hi
The real answer to the problem is to dig into the bowels of 1940’s electronic
craft.
There are various methods for setting up an L/C filter. You short this / open
that sweep
to find a dip or a peak. You move it to the “right” place. Just
.com/dishal-bandpass-filter-tuning-using-lasertrim-chip-caps>
>
> -John
>
> -Original Message-
> From: Bob kb8tq via time-nuts
> Sent: Thursday, May 26, 2022 10:18 AM
> To: Discussion of precise time and frequency measurement
>
> Cc: Bob kb8tq
> Subject
On 5/26/22 8:24 AM, Richard (Rick) Karlquist wrote:
The tweezers are really good *only* for single components - even if they
come with test leads, that's for measuring something like a motor start
capacitor.
I tried using tweezers (cheap ones to be sure) to measure a moderately
complex
Am 2022-05-26 17:24, schrieb Richard (Rick) Karlquist via time-nuts:
VNA's of any kind (no matter how small their size) don't work well on
components that are too far away from 50 ohms, at least if
you make a simple minded s11 smith chart measurement. There
are complicated work-arounds for
Google (other search engines are available :-) DISHAL Filter Tuning
Very neat and quick way to tune up a filter using just return loss.
Doesn't even require a VNWA.
Andy
www.g4jnt.com
On Thu, 26 May 2022 at 16:40, Bob kb8tq via time-nuts <
time-nuts@lists.febo.com> wrote:
> Hi
>
> The real
Hi
The real answer to the problem is to dig into the bowels of 1940’s electronic
craft.
There are various methods for setting up an L/C filter. You short this / open
that sweep
to find a dip or a peak. You move it to the “right” place. Just what you do
depends
very much on the filter design.
I have had good results with the LCR Research tweezers.
Search "LCR Research" on Amazon. They work great on
anything you can pick up or probe with tweezers.
The general disclaimer on any kind of component measuring
device is:
Virtually all of them are ONLY suitable for measuring a
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