-nuts@febo.com
Sent: Thursday, February 22, 2007 00:12
Subject: Re: [time-nuts] SRS SR620 External Source Issue -- Help Request
I have an SR620 counter that I set up with a Z3801A as an external
reference. If I put a bnc T connector at the output
of the Z3801A and use two equal length bnc
time and frequency measurement
time-nuts@febo.com
Sent: Wednesday, February 21, 2007 23:13
Subject: Re: [time-nuts] SRS SR620 External Source Issue -- Help Request
I ran into this same problem with my first SR620. I thought it was
defective, so I sent it to SRS for a cal and refurbishment
of precise time and frequency measurement
Betreff: [time-nuts] SRS SR620 External Source Issue -- Help Request
I have an SR620 counter that I set up with a Z3801A as an
external reference. If I put a bnc T connector at the output
of the Z3801A and use two equal length bnc cables, one
this offset is correct.
- Original Message -
From: Robert Crawford [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Wednesday, February 21, 2007 23:13
Subject: Re: [time-nuts] SRS SR620 External Source Issue -- Help Request
I ran
-
From: Ulrich Bangert [EMAIL PROTECTED]
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com
Sent: Thursday, February 22, 2007 11:24
Subject: Re: [time-nuts] SRS SR620 External Source Issue -- Help Request
Dear ???,
I encountered pretty much the same effect when I bought my
a mean
that is accurate.
-Flavio
- Original Message -
From: Robert Crawford [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Thursday, February 22, 2007 11:58
Subject: Re: [time-nuts] SRS SR620 External Source Issue -- Help Request
Perhaps you're running into some sort of meta-stability problem since
your clock and input are synchronous. Try lengthening one of the
cables a foot or so and see if it makes any difference.
I'd be very suspicious of a metastability problem if the results are even
somewhat reproducible.
and frequency measurement
time-nuts@febo.com
Sent: Thursday, February 22, 2007 00:12
Subject: Re: [time-nuts] SRS SR620 External Source Issue -- Help Request
I have an SR620 counter that I set up with a Z3801A as an external
reference. If I put a bnc T connector at the output
I have an SR620 counter that I set up with a Z3801A as an external reference.
If I put a bnc T connector at the output of the Z3801A and use two equal length
bnc cables, one to the ext. ref input on the back and the other to channel A
then do a frequency measurement, I get a mean that is about
From: [EMAIL PROTECTED]
Subject: Re: [time-nuts] SRS SR620 External Source Issue -- Help Request
Date: Wed, 21 Feb 2007 18:13:08 -0500
Message-ID: [EMAIL PROTECTED]
I've done the self calibration. Nothing changes. I've let everything
warm-up and checked both channels A and B, same thing
Magnus Danielson wrote:
I don't have the manuals (and particular the service manual) for the
SR620,
does anybody have them in electronics form?
Cheers,
Magnus
___
time-nuts mailing list
time-nuts@febo.com
SR620 External Source Issue -- Help Request
Hi Flavio:
Have you tried using averaging? The right most digits are from an
interpolator and if you check the manual the displayed resolution is
much greater than the accuracy, but if you average say 1,000 readings
then those digits get much
At 02:57 PM 2/21/2007, you wrote:
I have an SR620 counter that I set up with a Z3801A as an external
reference. If I put a bnc T connector at the output of the Z3801A and use
two equal length bnc cables, one to the ext. ref input on the back and the
other to channel A then do a frequency
At 03:50 PM 2/21/2007, you wrote:
At 02:57 PM 2/21/2007, you wrote:
I have an SR620 counter that I set up with a Z3801A as an external
reference. If I put a bnc T connector at the output of the Z3801A and use
two equal length bnc cables, one to the ext. ref input on the back and the
other to
Mike Fahmie wrote:
At 02:57 PM 2/21/2007, you wrote:
I have an SR620 counter that I set up with a Z3801A as an external
reference. If I put a bnc T connector at the output of the Z3801A and use
two equal length bnc cables, one to the ext. ref input on the back and the
other to channel
Your SR620 is well within its specifications, the tolerance for this
test is -0.0035 Hz to + 0.0035 Hz.
The readings fluctuate by that amount, but the mean is still off by -0.00150
Hz.
Changing cable length...
Tried it, no difference.
25Ohm load with two terms
Tried all variations of
From: Dr Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] SRS SR620 External Source Issue -- Help Request
Date: Thu, 22 Feb 2007 12:40:57 +1300
Message-ID: [EMAIL PROTECTED]
Hej Bruce,
http://thinksrs.com/downloads/PDFs/Manuals/SR620m.pdf
Many thanks!
Has everything except circuit
-nuts] SRS SR620 External Source Issue -- Help Request
Hej Magnus
The Frequency measurement logic (before the interpolators) appears to
use a pair of 2 bit synchonisers, one for the rising edge and one for
the falling edge of the internally generated frequency gate. The
synchronisers
, February 21, 2007 19:47
Subject: Re: [time-nuts] SRS SR620 External Source Issue -- Help Request
Hej Magnus
The Frequency measurement logic (before the interpolators) appears to
use a pair of 2 bit synchonisers, one for the rising edge and one for
the falling edge of the internally generated
...if my model is correct the apparent offset in the
mean will be increased by a factor of 10 over that for a a 1 second gate
time.
Bruce
Looks like you're right Bruce. I did both 1, 0.1 and 0.01 gate times and
the error increased by a factor of 10.
And it doesn't sound like this is a
[EMAIL PROTECTED] wrote:
...if my model is correct the apparent offset in the
mean will be increased by a factor of 10 over that for a a 1 second gate
time.
Bruce
Looks like you're right Bruce. I did both 1, 0.1 and 0.01 gate times and
the error increased by a factor of 10.
And
I ran into this same problem with my first SR620. I thought it was
defective, so I sent it to SRS for a cal and refurbishment. It got
better, but still had an offset of 0.0004 Hz. Later I bought a second
one, and it, too, had an offset similar to yours.
A careful reading of the manual, page
Dr Bruce Griffiths wrote:
[EMAIL PROTECTED] wrote:
...if my model is correct the apparent offset in the
mean will be increased by a factor of 10 over that for a a 1 second gate
time.
Bruce
Looks like you're right Bruce. I did both 1, 0.1 and 0.01 gate times and
the
I have an SR620 counter that I set up with a Z3801A as an external reference.
If I put a bnc T connector at the output
of the Z3801A and use two equal length bnc cables, one to the ext. ref input
on the back and the other to channel A
then do a frequency measurement, I get a mean that is
Didier Juges wrote:
Dr Bruce Griffiths wrote:
[EMAIL PROTECTED] wrote:
...if my model is correct the apparent offset in the
mean will be increased by a factor of 10 over that for a a 1 second gate
time.
Bruce
Looks like you're right Bruce. I did both
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