[time-nuts] Windows software for the SR620 counter

[Volker Esper]

 > ...When you switch on the
 > SR620 the fan should be slowly increasing its speed over several
 > minutes if the circuit is operating properly.

That's what my fan does (over abot 15min), but it doesn't stop 
increasing until it's reached maximum speed.

 > If you bought your SR620 second hand

of course...

 > If the fan noise is very disturbing

indeed, it is

 > you may consider replacing the fan
 > with a low noise fan made for computer use.

That was my suggestion. Since there are a lot of fine fans from quality 
manufacturers that shouldn'd be an issue. EBM Pabst for example sells 15 
different 24V-types of that dimensions. But prior to this I will check 
the electronics, of course.

mni tnx es 73 de df9pl

Volker





Am 13.11.2012 10:34, schrieb Jarl Risum:
> Hello Volker
>
> Thanks for your kind answer.
>
> The fan in my SR620 is fairly quiet. As you are probably aware the fan
> speed in the SR620 is controlled by a temperature sensor monitoring
> the temperature of the exhaust air. One possible explanation for your
> noisy fan could be that the sensor or (part of) the circuit
> controlling the fan speed has become faulty. When you switch on the
> SR620 the fan should be slowly increasing its speed over several
> minutes if the circuit is operating properly.
>
> If you bought your SR620 second hand the previous owner might have
> tampered with the control circuit or the fan has been changed to
> another type. My SR620 is equipped with the original fan as described
> in the parts list: a Delta DBF0624H (24V / 0,11A). When I searched the
> Internet for information about this fan I learned that is is no longer
> manufactured.
>
> If the fan noise is very disturbing you may consider replacing the fan
> with a low noise fan made for computer use. Due to the moderate
> temperatures in northern Europe this should be a fairly safe operation
> even if the airflow maximum is slightly reduced. The Delta fan is a
> standard 60x60x25 mm type so low noise alternatives should be easy to
> find.
>
> Good luck and best 73's from OZ9MO / Jarl
>
>
> 2012/11/12 Volker Esper<ailer2 at t-online.de>:
>>
>> Thanks a lot, dear Jarl, those seem to be important hints!
>>
>> Speaking of the cooling system: the fan of my SR reminds me of my experience
>> as an electician, when I had to work with 50kW-fans... I'm going to replace
>> that beast- is it typical for the SR to blow like a hair dryer? I can't
>> beleave that...
>>
>> Cheers - Volker - DF9PL
>>
>>
>> Am 12.11.2012 21:14, schrieb Jarl Risum:
>>>
>>> Hello Volker
>>>
>>> You asked for Windows software to use with the SR620 counter and its
>>> RS232 interface.
>>>
>>> I have used John Miles' "TimeLab" with my SR620 and RS232 with great
>>> success.
>>>
>>> You may download TimeLab here:   http://www.miles.io/timelab/readme.htm
>>>
>>> It is freeware and supports a number of different counters, including
>>> tha SR620. You just need to select the SR620 in the setup menu.
>>>
>>> I would like to draw your attention to something perhaps obvious to
>>> you: Please note that the SR620 need to be in operation for some time
>>> - half an hour at least - before any attempt to calibrate it is
>>> carried out. And it need to be placed with some space around it in
>>> order to not get too hot after some hours of operation.
>>>
>>> I would also like to add, that in my experience a Power Conditioner (
>>> a medical qualified 230V to 230V transformer with a ground connected
>>> static shield) to feed the SR620 with power is helpful to keep away
>>> mains borne transients. Also an external circuit to convert sine
>>> shaped input signals to square waves before feeding the SR620 input is
>>> useful, as previously discussed on the Time Nuts reflector.
>>>
>>> I wish you good luck with your experiments.
>>>
>>> Cheers from OZ9MO /Jarl
>>> (Danish Time-Nut)
>>>
>>>
>>
>>
>
>