[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 <jgray at 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 <jgray at 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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