On Tue, 03 Jul 2012 15:33:33 -0700, John Miles wrote:
Ahhh ... Thanx now i know why my 1hr Trace Duration was so fast. I
assumed that Timelab would set the sampling interval written in Timelab
via GPIB. But i'll just select 1sec manually.
That can be a bit confusing. The TimeLab drivers
I just got a PM6680/016 - Std. Osc + GPIB + 1.3Ghz -Chan.C
The best my budget could afford :-)
I would like to try out John's Timelab.
But only have a Prologix-Ethernet GPIB adapter , no USB version.
I was wondering if anyone can confirm that Timelab would work on a
PM6680 , using a
Using GPIB adapters over Ethernet can be difficult as the application
software must open the device like
TCPIP::your_adapter_IP_address::gpib0::intfc and, of course, accept an IP
address somewhere.
On Tue, Jul 3, 2012 at 4:34 PM, cfo xne...@luna.dyndns.dk wrote:
I just got a PM6680/016 - Std.
On 7/3/12 7:34 AM, cfo wrote:
I just got a PM6680/016 - Std. Osc + GPIB + 1.3Ghz -Chan.C
The best my budget could afford :-)
I would like to try out John's Timelab.
But only have a Prologix-Ethernet GPIB adapter , no USB version.
I was wondering if anyone can confirm that Timelab would work on
On Tue, 03 Jul 2012 14:34:08 +, cfo wrote:
I just got a PM6680/016 - Std. Osc + GPIB + 1.3Ghz -Chan.C The best my
budget could afford :-)
I would like to try out John's Timelab. But only have a
Prologix-Ethernet GPIB adapter , no USB version.
I was wondering if anyone can confirm
When you start TimeLab, which mode does the PM6680 show? FREQ A or TIME A-B?
On Tue, Jul 3, 2012 at 5:46 PM, cfo xne...@luna.dyndns.dk wrote:
On Tue, 03 Jul 2012 14:34:08 +, cfo wrote:
I just got a PM6680/016 - Std. Osc + GPIB + 1.3Ghz -Chan.C The best my
budget could afford :-)
I
On Tue, 03 Jul 2012 18:11:26 +0200, Azelio Boriani wrote:
When you start TimeLab, which mode does the PM6680 show? FREQ A or TIME
A-B?
It shows Data Type = time interval , i could also select frequency in the
drop down box (This is the latest TimeLab - NonBeta).
Now have i goofed ?
Is time
On Tue, 03 Jul 2012 18:11:26 +0200, Azelio Boriani wrote:
When you start TimeLab, which mode does the PM6680 show? FREQ A or TIME
A-B?
I have uploaded a screenshot of the settings here
http://img577.imageshack.us/img577/4171/timelabpm6680.png
And the Timelab ADEV here
Well, let's see: usually the Allan deviation is computed by collecting
phase (time error) samples. You have to select time interval in TimeLab and
on the PM6680 TIME A-B. If you want to use frequency samples (this is
strange for me, never used frequency samples) then you must select
frequency in
Yes, you can ask here about these things.
Anyway, the best is to use the TBolt as a reference (not necessarily on the
external ref of the counter) and test another oscillator or GPSDO. For
example: feed the TBolt PPS to A, the GPSDO_under_test PPS to B and measure
the stability of the time
On Tue, 03 Jul 2012 19:08:56 +0200, Azelio Boriani wrote:
Yes, you can ask here about these things. Anyway, the best is to use the
TBolt as a reference (not necessarily on the external ref of the
counter) and test another oscillator or GPSDO. For example: feed the
TBolt PPS to A, the
When used as a time interval counter, the PM6680 (as well as other
counters) counts the reference oscillator cycles + a residual got from an
interpolator. Suppose you have to measure 234nS: with a 100MHz oscillator
you count 23 cycles (the 100MHz is 10nS cycle) and then you are left with
an
Hi
That works out fine *if* the edges are close to each other.
Consider one edge arriving a half second before the other one. Then the reading
is off by a nanosecond for each 2 ppb the reference is off frequency. If you
have a TCXO as the reference for your counter, you likely will be further
Yes, you are right: my example was, for this reason, limited to a couple
hundred nS. Usually testing PPSes or 10MHz sources leads to very small time
intervals so the resolution of the interpolator dominates. For time
intervals beyond the nS figures it is better to consider a stable
reference.
Ahhh ... Thanx now i know why my 1hr Trace Duration was so fast.
I assumed that Timelab would set the sampling interval written in Timelab
via GPIB. But i'll just select 1sec manually.
That can be a bit confusing. The TimeLab drivers for GPIB counters don't
attempt to program the counter in
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