Re: [time-nuts] SR620 testing

[Alan Ambrose]

>>> XY outputs - text at the top is slanted and text near the middle right is 
>>> overlaid. I don't know if I care about this, as I am unlikely to use this 
>>> feature.



I tried this briefly on a digital scope and it looked a bit iffy. Maybe it's 
better on an analogue scope.



If I remember rightly, I think the device needs a utility writing to fix one of 
the cal constants for frequency when calibrating from a good 10MHz source. I'll 
do that if I get the time unless anyone has written one already?



Alan

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Re: [time-nuts] SR620 testing

[Joseph Gray]

I don't think I would use the XY output, but I'm sure that this tilted
and overlaid text is not correct.

https://dl.dropboxusercontent.com/u/19599147/XY%20mode.jpg

Joe Gray
W5JG
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Re: [time-nuts] SR620 testing

[Magnus Danielson]

Hi,

The SR620 has a Z80 dedicated to update the X/Y DACs. For some trimmings 
it really helps.


The SR620 is a mix of a relatively flexible counter, yet it has some 
limits, which can be annoying for some measurements. In the end I kind 
of like it.


Cheers,
Magnus

On 02/23/2016 01:13 PM, Bob Camp wrote:

Hi

You may have cleaned up a dirty pot wiper as well …

The SR620 has X/Y outputs? Who knew?  … that’s how often that feature
gets used around here.

Bob


On Feb 23, 2016, at 12:14 AM, Joseph Gray  wrote:

Ignore the problem with EXT trigger. I did a factory reset and now it
is working. I should have thought to reset it to begin with.

Joe Gray
W5JG


On Mon, Feb 22, 2016 at 8:14 PM, Joseph Gray  wrote:

Finally got an SR620 at a decent price. I'm going through the
Functional Tests and the Performance Tests now. So far, I have two
anomalies.

Pg 62 Functional Test - EXT input. When I vary the EXT trigger knob, I
don't get the trigger LED, except that it flashes briefly at one spot
as I move the knob from high to low.

XY outputs - text at the top is slanted and text near the middle right
is overlaid. I don't know if I care about this, as I am unlikely to
use this feature.

I can't test the printer port. No Epson printer. I probably don't care
about this, either.

Pg 63 Performance Test - Timebase frequency is 15 Hz high. I will adjust later.

Timebase accuracy +/- 0.0035 Hz passes.

This is far as I have gotten. After I get a bite of dinner, I will proceed.

The EXT trigger test not working worries me. Perhaps I am doing something wrong?


Joe Gray
W5JG

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Re: [time-nuts] SR620 testing

[Don@True-Cal]

Guys,

The SR620 X/Y feature is extremely valuable for my time lab. You probably need 
to rethink the feature after setting up a nice X/Y display and experimenting 
with the different display features. I use an Rb and distribution amp for my 
lab 10MHz standard which feeds the external ref input of the SR620. When the 
TIC is not being used for other things, it has a Thunderbolt with a double-oven 
OCXO (TC=1200) connected to one channel and the 10MHz ref to the other 
measuring zero-crossing time difference. Triggering with the TIC 1KHz output 
and using 1E5 samples sizes makes the horizontal axis approximately 7-hours 
while the vertical axis is set for 20ns/div allowing visibility of plus/minus 
50ns or the whole 100ns phase cycle of the 10MHz after a 50ns reference is set. 
I added an extremely fine external EFC to my Rb reference and this allows me to 
make fine enough ref frequency changes to strive for zero-slope displays of 
many hours and even days. The 20ns/div typically reveals plus/minus 10
 ns GPS bumps but the overall slope over many hours is what's important. You 
could do this through the GPIB but you are tying up a lot more resources during 
the extended runs. My Tektronix 606B display cost me $50 years ago. Take my 
word, it's worth checking out - don't write off the X/Y outputs. Pictures on 
request or can someone give me an upload site.

Don

-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp
Sent: Tuesday, February 23, 2016 6:13 AM
To: Discussion of precise time and frequency measurement <time-nuts@febo.com>
Subject: Re: [time-nuts] SR620 testing

Hi

You may have cleaned up a dirty pot wiper as well …

The SR620 has X/Y outputs? Who knew?  … that’s how often that feature gets used 
around here.

Bob

> On Feb 23, 2016, at 12:14 AM, Joseph Gray <jg...@zianet.com> wrote:
> 
> Ignore the problem with EXT trigger. I did a factory reset and now it 
> is working. I should have thought to reset it to begin with.
> 
> Joe Gray
> W5JG
> 
> 
> On Mon, Feb 22, 2016 at 8:14 PM, Joseph Gray <jg...@zianet.com> wrote:
>> Finally got an SR620 at a decent price. I'm going through the 
>> Functional Tests and the Performance Tests now. So far, I have two 
>> anomalies.
>> 
>> Pg 62 Functional Test - EXT input. When I vary the EXT trigger knob, 
>> I don't get the trigger LED, except that it flashes briefly at one 
>> spot as I move the knob from high to low.
>> 
>> XY outputs - text at the top is slanted and text near the middle 
>> right is overlaid. I don't know if I care about this, as I am 
>> unlikely to use this feature.
>> 
>> I can't test the printer port. No Epson printer. I probably don't 
>> care about this, either.
>> 
>> Pg 63 Performance Test - Timebase frequency is 15 Hz high. I will adjust 
>> later.
>> 
>> Timebase accuracy +/- 0.0035 Hz passes.
>> 
>> This is far as I have gotten. After I get a bite of dinner, I will proceed.
>> 
>> The EXT trigger test not working worries me. Perhaps I am doing something 
>> wrong?
>> 
>> 
>> Joe Gray
>> W5JG
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Re: [time-nuts] SR620 testing

[Bob Camp]

Hi

You may have cleaned up a dirty pot wiper as well …

The SR620 has X/Y outputs? Who knew?  … that’s how often that feature
gets used around here.

Bob

> On Feb 23, 2016, at 12:14 AM, Joseph Gray  wrote:
> 
> Ignore the problem with EXT trigger. I did a factory reset and now it
> is working. I should have thought to reset it to begin with.
> 
> Joe Gray
> W5JG
> 
> 
> On Mon, Feb 22, 2016 at 8:14 PM, Joseph Gray  wrote:
>> Finally got an SR620 at a decent price. I'm going through the
>> Functional Tests and the Performance Tests now. So far, I have two
>> anomalies.
>> 
>> Pg 62 Functional Test - EXT input. When I vary the EXT trigger knob, I
>> don't get the trigger LED, except that it flashes briefly at one spot
>> as I move the knob from high to low.
>> 
>> XY outputs - text at the top is slanted and text near the middle right
>> is overlaid. I don't know if I care about this, as I am unlikely to
>> use this feature.
>> 
>> I can't test the printer port. No Epson printer. I probably don't care
>> about this, either.
>> 
>> Pg 63 Performance Test - Timebase frequency is 15 Hz high. I will adjust 
>> later.
>> 
>> Timebase accuracy +/- 0.0035 Hz passes.
>> 
>> This is far as I have gotten. After I get a bite of dinner, I will proceed.
>> 
>> The EXT trigger test not working worries me. Perhaps I am doing something 
>> wrong?
>> 
>> 
>> Joe Gray
>> W5JG
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Re: [time-nuts] SR620 testing

[Joseph Gray]

Ignore the problem with EXT trigger. I did a factory reset and now it
is working. I should have thought to reset it to begin with.

Joe Gray
W5JG


On Mon, Feb 22, 2016 at 8:14 PM, Joseph Gray  wrote:
> Finally got an SR620 at a decent price. I'm going through the
> Functional Tests and the Performance Tests now. So far, I have two
> anomalies.
>
> Pg 62 Functional Test - EXT input. When I vary the EXT trigger knob, I
> don't get the trigger LED, except that it flashes briefly at one spot
> as I move the knob from high to low.
>
> XY outputs - text at the top is slanted and text near the middle right
> is overlaid. I don't know if I care about this, as I am unlikely to
> use this feature.
>
> I can't test the printer port. No Epson printer. I probably don't care
> about this, either.
>
> Pg 63 Performance Test - Timebase frequency is 15 Hz high. I will adjust 
> later.
>
> Timebase accuracy +/- 0.0035 Hz passes.
>
> This is far as I have gotten. After I get a bite of dinner, I will proceed.
>
> The EXT trigger test not working worries me. Perhaps I am doing something 
> wrong?
>
>
> Joe Gray
> W5JG
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[time-nuts] SR620 testing

[Joseph Gray]

Finally got an SR620 at a decent price. I'm going through the
Functional Tests and the Performance Tests now. So far, I have two
anomalies.

Pg 62 Functional Test - EXT input. When I vary the EXT trigger knob, I
don't get the trigger LED, except that it flashes briefly at one spot
as I move the knob from high to low.

XY outputs - text at the top is slanted and text near the middle right
is overlaid. I don't know if I care about this, as I am unlikely to
use this feature.

I can't test the printer port. No Epson printer. I probably don't care
about this, either.

Pg 63 Performance Test - Timebase frequency is 15 Hz high. I will adjust later.

Timebase accuracy +/- 0.0035 Hz passes.

This is far as I have gotten. After I get a bite of dinner, I will proceed.

The EXT trigger test not working worries me. Perhaps I am doing something wrong?


Joe Gray
W5JG
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