Empathy List Archives

MS

Mark Spencer

Mon, Mar 7, 2011 4:52 PM

Greetings. I'm wondering if any one has any insight (or wishes to speculate) as
to how the external analog frequency adjustment on a Temex LPFRS-01 Rubidium
standard functions.

From experimenting with one over the last few days there seems to be a step
function to the adjustment.   I'm wondering if frequency adjustment voltage is
read by an ADC which is monitored by the CPU which adjusts the frequency ?
(Or perhaps I'm just not adjusting the multi turn trimmer properly.)

Regards
Mark Spencer
VE7AFZ

Greetings. I'm wondering if any one has any insight (or wishes to speculate) as to how the external analog frequency adjustment on a Temex LPFRS-01 Rubidium standard functions. From experimenting with one over the last few days there seems to be a step function to the adjustment. I'm wondering if frequency adjustment voltage is read by an ADC which is monitored by the CPU which adjusts the frequency ? (Or perhaps I'm just not adjusting the multi turn trimmer properly.) Regards Mark Spencer VE7AFZ

MD

Magnus Danielson

Mon, Mar 7, 2011 5:43 PM

On 03/07/2011 05:52 PM, Mark Spencer wrote:

Greetings. I'm wondering if any one has any insight (or wishes to speculate) as
to how the external analog frequency adjustment on a Temex LPFRS-01 Rubidium
standard functions.

From experimenting with one over the last few days there seems to be a step
function to the adjustment. I'm wondering if frequency adjustment voltage is
read by an ADC which is monitored by the CPU which adjusts the frequency ?
(Or perhaps I'm just not adjusting the multi turn trimmer properly.)

There is a CPU in there with ADC and DACs. You also have serial
interface to it, so you could hook it up to RS-232. Don't recall from
the top of my head if the levels is RS-232 or CMOS, but I can check...
as I have one.

Cheers,
Magnus

On 03/07/2011 05:52 PM, Mark Spencer wrote: > Greetings. I'm wondering if any one has any insight (or wishes to speculate) as > to how the external analog frequency adjustment on a Temex LPFRS-01 Rubidium > standard functions. > > > From experimenting with one over the last few days there seems to be a step > function to the adjustment. I'm wondering if frequency adjustment voltage is > read by an ADC which is monitored by the CPU which adjusts the frequency ? > (Or perhaps I'm just not adjusting the multi turn trimmer properly.) There is a CPU in there with ADC and DACs. You also have serial interface to it, so you could hook it up to RS-232. Don't recall from the top of my head if the levels is RS-232 or CMOS, but I can check... as I have one. Cheers, Magnus

MS

Mark Spencer

Mon, Mar 7, 2011 6:45 PM

Thanks.   I recall seeing documentation that more or less said that directly
connecting these units to an RS232 port will typically work but is not
guaranteed.  If you are able to easily check your unit that would be great but I
will likely try connecting mine to an RS232 port in the next few weeks.

I wanted to get a sense of how well the unit is working prior to putting to much
effort into this.   As it arrived with a circuit board that includes a frequency
adjust trimmer it was pretty simple to test.

The spec sheet indicates that the smallest frequency step for RS 232 control
is 1X10-11, and I was also curious if finer frequency control was possible via
the analog frequency adjust input.   I suspect that 1 x 10-11 is the limit but
I'm not 100 percent sure of this.

----- Original Message ----
From: Magnus Danielson magnus@rubidium.dyndns.org
To: time-nuts@febo.com
Sent: Mon, March 7, 2011 9:43:47 AM
Subject: Re: [time-nuts] Temex LPFRS-01 analog frequency adjustement

On 03/07/2011 05:52 PM, Mark Spencer wrote:

Greetings. I'm wondering if any one has any insight (or wishes to speculate)
as
to how the external analog frequency adjustment on a Temex LPFRS-01 Rubidium
standard functions.

From experimenting with one over the last few days there seems to be a step
function to the adjustment. I'm wondering if frequency adjustment voltage is
read by an ADC which is monitored by the CPU which adjusts the frequency ?
(Or perhaps I'm just not adjusting the multi turn trimmer properly.)

There is a CPU in there with ADC and DACs. You also have serial interface to it,
so you could hook it up to RS-232. Don't recall from the top of my head if the
levels is RS-232 or CMOS, but I can check... as I have one.

Cheers,
Magnus

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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Thanks. I recall seeing documentation that more or less said that directly connecting these units to an RS232 port will typically work but is not guaranteed. If you are able to easily check your unit that would be great but I will likely try connecting mine to an RS232 port in the next few weeks. I wanted to get a sense of how well the unit is working prior to putting to much effort into this. As it arrived with a circuit board that includes a frequency adjust trimmer it was pretty simple to test. The spec sheet indicates that the smallest frequency step for RS 232 control is 1X10-11, and I was also curious if finer frequency control was possible via the analog frequency adjust input. I suspect that 1 x 10-11 is the limit but I'm not 100 percent sure of this. ----- Original Message ---- From: Magnus Danielson <magnus@rubidium.dyndns.org> To: time-nuts@febo.com Sent: Mon, March 7, 2011 9:43:47 AM Subject: Re: [time-nuts] Temex LPFRS-01 analog frequency adjustement On 03/07/2011 05:52 PM, Mark Spencer wrote: > Greetings. I'm wondering if any one has any insight (or wishes to speculate) >as > to how the external analog frequency adjustment on a Temex LPFRS-01 Rubidium > standard functions. > > > From experimenting with one over the last few days there seems to be a step > function to the adjustment. I'm wondering if frequency adjustment voltage is > read by an ADC which is monitored by the CPU which adjusts the frequency ? > (Or perhaps I'm just not adjusting the multi turn trimmer properly.) There is a CPU in there with ADC and DACs. You also have serial interface to it, so you could hook it up to RS-232. Don't recall from the top of my head if the levels is RS-232 or CMOS, but I can check... as I have one. Cheers, Magnus _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

MD

Magnus Danielson

Mon, Mar 7, 2011 7:10 PM

On 03/07/2011 07:45 PM, Mark Spencer wrote:

Thanks. I recall seeing documentation that more or less said that directly
connecting these units to an RS232 port will typically work but is not
guaranteed. If you are able to easily check your unit that would be great but I
will likely try connecting mine to an RS232 port in the next few weeks.

It's easy enough to access. But much easier is it to go to Spectratime
website and download the manual:
http://www.spectratime.com/products/isource/
http://www.spectratime.com/documents/lpfrs_manual.pdf

Already on page 1 I can read the label of the photo which says

6 : TXD (TTL)
9 : RXD (TTL)

Which is a good hint. Start reading at page 10 in the manual.

I wanted to get a sense of how well the unit is working prior to putting to much
effort into this. As it arrived with a circuit board that includes a frequency
adjust trimmer it was pretty simple to test.

The spec sheet indicates that the smallest frequency step for RS 232 control
is 1X10-11, and I was also curious if finer frequency control was possible via
the analog frequency adjust input. I suspect that 1 x 10-11 is the limit but
I'm not 100 percent sure of this.

See page 13 of the manual and you fill find your confirmation.

As for status, the serial interface should give you a bunch of status
report. I just haven't taken the time to hook it up.

Cheers,
Magnus

On 03/07/2011 07:45 PM, Mark Spencer wrote: > Thanks. I recall seeing documentation that more or less said that directly > connecting these units to an RS232 port will typically work but is not > guaranteed. If you are able to easily check your unit that would be great but I > will likely try connecting mine to an RS232 port in the next few weeks. It's easy enough to access. But much easier is it to go to Spectratime website and download the manual: http://www.spectratime.com/products/isource/ http://www.spectratime.com/documents/lpfrs_manual.pdf Already on page 1 I can read the label of the photo which says 6 : TXD (TTL) 9 : RXD (TTL) Which is a good hint. Start reading at page 10 in the manual. > I wanted to get a sense of how well the unit is working prior to putting to much > effort into this. As it arrived with a circuit board that includes a frequency > adjust trimmer it was pretty simple to test. > > The spec sheet indicates that the smallest frequency step for RS 232 control > is 1X10-11, and I was also curious if finer frequency control was possible via > the analog frequency adjust input. I suspect that 1 x 10-11 is the limit but > I'm not 100 percent sure of this. See page 13 of the manual and you fill find your confirmation. As for status, the serial interface should give you a bunch of status report. I just haven't taken the time to hook it up. Cheers, Magnus

MS

Mark Spencer

Mon, Mar 7, 2011 7:48 PM

Thanks

The doccumentation regardings RS232 controll looks usefull. (I had not seen
this before, and in case any one else is following this thread here is a link..)
http://www.spectratime.com/documents/lpfrs_rs_232.pdf

Regards
Mark S

----- Original Message ----
From: Magnus Danielson magnus@rubidium.dyndns.org
To: time-nuts@febo.com
Sent: Mon, March 7, 2011 11:10:13 AM
Subject: Re: [time-nuts] Temex LPFRS-01 analog frequency adjustement

On 03/07/2011 07:45 PM, Mark Spencer wrote:

Thanks. I recall seeing documentation that more or less said that directly
connecting these units to an RS232 port will typically work but is not
guaranteed. If you are able to easily check your unit that would be great but
I
will likely try connecting mine to an RS232 port in the next few weeks.

It's easy enough to access. But much easier is it to go to Spectratime website
and download the manual:
http://www.spectratime.com/products/isource/
http://www.spectratime.com/documents/lpfrs_manual.pdf

Already on page 1 I can read the label of the photo which says

6 : TXD (TTL)
9 : RXD (TTL)

Which is a good hint. Start reading at page 10 in the manual.

I wanted to get a sense of how well the unit is working prior to putting to
much
effort into this. As it arrived with a circuit board that includes a

frequency

adjust trimmer it was pretty simple to test.

The spec sheet indicates that the smallest frequency step for RS 232 control
is 1X10-11, and I was also curious if finer frequency control was possible via
the analog frequency adjust input. I suspect that 1 x 10-11 is the limit but
I'm not 100 percent sure of this.

See page 13 of the manual and you fill find your confirmation.

As for status, the serial interface should give you a bunch of status report. I
just haven't taken the time to hook it up.

Cheers,
Magnus

time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Thanks The doccumentation regardings RS232 controll looks usefull. (I had not seen this before, and in case any one else is following this thread here is a link..) http://www.spectratime.com/documents/lpfrs_rs_232.pdf Regards Mark S ----- Original Message ---- From: Magnus Danielson <magnus@rubidium.dyndns.org> To: time-nuts@febo.com Sent: Mon, March 7, 2011 11:10:13 AM Subject: Re: [time-nuts] Temex LPFRS-01 analog frequency adjustement On 03/07/2011 07:45 PM, Mark Spencer wrote: > Thanks. I recall seeing documentation that more or less said that directly > connecting these units to an RS232 port will typically work but is not > guaranteed. If you are able to easily check your unit that would be great but >I > will likely try connecting mine to an RS232 port in the next few weeks. It's easy enough to access. But much easier is it to go to Spectratime website and download the manual: http://www.spectratime.com/products/isource/ http://www.spectratime.com/documents/lpfrs_manual.pdf Already on page 1 I can read the label of the photo which says 6 : TXD (TTL) 9 : RXD (TTL) Which is a good hint. Start reading at page 10 in the manual. > I wanted to get a sense of how well the unit is working prior to putting to >much > effort into this. As it arrived with a circuit board that includes a frequency > adjust trimmer it was pretty simple to test. > > The spec sheet indicates that the smallest frequency step for RS 232 control > is 1X10-11, and I was also curious if finer frequency control was possible via > the analog frequency adjust input. I suspect that 1 x 10-11 is the limit but > I'm not 100 percent sure of this. See page 13 of the manual and you fill find your confirmation. As for status, the serial interface should give you a bunch of status report. I just haven't taken the time to hook it up. Cheers, Magnus _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

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Temex LPFRS-01 analog frequency adjustement