[time-nuts] Best counter setting for ADEV?
SAIDJACK at aol.com
SAIDJACK at aol.com
Tue Oct 2 19:39:37 UTC 2012
Yes, very easy:
1) calibrate the internal 100MHz vectron OCXO using a small screwdriver,
this is not really critical though as the unit does not really function as a
frequency counter.
2) Calibrate the power supplies for proper voltages if necessary with same
screwdriver, I found that is really not necessary usually
3) Auto-calibrate all the timing circuits using the built-in calibration
feature and two external SMA cables, and two SMA shorts. The button to do
that is on the front panel, and the unit does not have to be opened for this.
You can also use their VISI application to do some more intensive
long-term-averaging calibrations that are started via GPIB commands.
There are user/service manuals floating around the web.
Item 3) above is really the only thing that needs to be done from time to
time I think.
bye,
Said
In a message dated 10/2/2012 12:30:34 Pacific Daylight Time,
jsternmd at att.net writes:
Are these easily calibrated? I contacted Wavecrest earlier today and they
want $750 for the annual calibration. Not exactly 'hobby' friendly :-)
jerry
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Said Jackson
Sent: Tuesday, October 02, 2012 9:06 AM
To: Discussion of precise time and frequency measurement
Cc: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Best counter setting for ADEV?
There are two on ebay now, $600 and $700... Buy it now..
I would ask the seller to connect the 100MHz ref output to both inputs one
at a time and to measure jitter to make sure they work before buying
though..
Dts-2075 recommended due to higher performance.
On Oct 2, 2012, at 5:49, Azelio Boriani <azelio.boriani at screen.it> wrote:
> Wavecrest DTS for $600? Interesting...
>
> On Tue, Oct 2, 2012 at 2:43 PM, Adrian <rfnuts at arcor.de> wrote:
>
>> Timeok schrieb:
>>
>> test using HP53123A:
>>> The pink line is the noise floor using the TI mode The blue line is
>>> the noise floor using the Frequency mode (gate 2 sec) The other two
>>> line are the same oscillator, an HP105B tested with both the modes.
>>> As you can see the range between 1 and 200 sec is "totally
>>> compromised" by the system noise floor using the TI method.
>>> The approximation using the freq mode can be anyway usefull to make
>>> a comparatinon between two source.
>>> I suppose to have right measurements, without any restriction we
>>> have to use the Timepod or other high level instruments than this
>>> kind of counters.
>>>
>>> Luciano
>>>
>>
>> Hi Luciano,
>>
>> interesting. So, the 53132A gains a lot more by this method than my
53131A.
>> As Magnus pointed to, there might be pitfalls. So, it would be
>> interesting to have comparative measurements from a non questionable
test
setup.
>>
>> In the meantime I tried a Tracor 527A which greatly improved the
>> dynamic range, but appears to suffer from serious instability that
>> might or might not be normal.
>>
>> Adrian
>>
>>
>>
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