Any Isotemp OCXO107-10 Info?
I just picked up an Isotemp OCXO107-10 Oscillator. I thought it looked
like it might be interesting, but it turns out that it's better than I
thought. It's got a Dewar flask! I found the specs, but it didn't
mention anything about that. So, before I let the magic smoke out, does
anyone have the pinout info? Mine has a DB9 male connector rather than
the DB25 shown on the specs but, of course, I'll be grateful for any info.
Thanks,
Ed
In message 531F7161.2080300@sasktel.net, Ed Palmer writes:
I just picked up an Isotemp OCXO107-10 Oscillator.
I can't remember which variant the on I have is. I'll check tomorrow.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
The specs I found talked about double ovens and a 16 bit D/A converter
for disciplining the frequency. Mine doesn't appear to have either of
those. Sounds like the OCXO 107 series included a lot of different
variants.
Ed
On 3/11/2014 3:48 PM, Poul-Henning Kamp wrote:
In message 531F7161.2080300@sasktel.net, Ed Palmer writes:
I just picked up an Isotemp OCXO107-10 Oscillator.
I can't remember which variant the on I have is. I'll check tomorrow.
In message 531F7161.2080300@sasktel.net, Ed Palmer writes:
I just picked up an Isotemp OCXO107-10 Oscillator. I thought it looked
like it might be interesting, but it turns out that it's better than I
thought. It's got a Dewar flask! I found the specs, but it didn't
mention anything about that. So, before I let the magic smoke out, does
anyone have the pinout info? Mine has a DB9 male connector rather than
the DB25 shown on the specs but, of course, I'll be grateful for any info.
Mine is an OCXO107-16, which is a 5MHz model.
It has DE9[1] connector with the following documented pinout:
1 - 5MHz logic (CMOS ?) [8.5 kOhm]
2 - DGND [0.14 Ohm]
3 - +5V [7.5 kOhm]
4 - [0.14 Ohm]
5 - +12V (Oven) [219 kOhm]
6 - [0.13 Ohm]
7 - AGND [0.12 Ohm]
8 - EFC [303 kOhm]
9 - VREF [5.7 kOhm]
Resistances in [] measured against the metal case, negative
terminal to case.
Any resistance between pins 2, 4, 6 and 7 are less than I
can measure with any precision.
+12V current starts at 350mA and ends up less than 80mA after
about half an hour.
+5V current is 5.2mA and probably only used for whatever chip
drives the cmos output on pin 1. Turning it on/off has no
effect on the sine-wave output on the SMA connector.
VREF stabilizes at 8.060... V after some hours.
EFC floats at 4.5580... V
[1] It's DB25 but DE9, the second letter is the shell size :-)
Hope this helps...
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
Many thanks, Poul.
This info is consistent with the wiring on my unit. By looking and
doing continuity tests, I've found ground on pins 2, 4, 6, and 7. The
wire on pin 3 is red so that's also likely a match to yours for the +5 lead.
Ed
On 3/12/2014 2:31 AM, Poul-Henning Kamp wrote:
In message 531F7161.2080300@sasktel.net, Ed Palmer writes:
I just picked up an Isotemp OCXO107-10 Oscillator. I thought it looked
like it might be interesting, but it turns out that it's better than I
thought. It's got a Dewar flask! I found the specs, but it didn't
mention anything about that. So, before I let the magic smoke out, does
anyone have the pinout info? Mine has a DB9 male connector rather than
the DB25 shown on the specs but, of course, I'll be grateful for any info.
Mine is an OCXO107-16, which is a 5MHz model.
It has DE9[1] connector with the following documented pinout:
1 - 5MHz logic (CMOS ?) [8.5 kOhm]
2 - DGND [0.14 Ohm]
3 - +5V [7.5 kOhm]
4 - [0.14 Ohm]
5 - +12V (Oven) [219 kOhm]
6 - [0.13 Ohm]
7 - AGND [0.12 Ohm]
8 - EFC [303 kOhm]
9 - VREF [5.7 kOhm]
Resistances in [] measured against the metal case, negative
terminal to case.
Any resistance between pins 2, 4, 6 and 7 are less than I
can measure with any precision.
+12V current starts at 350mA and ends up less than 80mA after
about half an hour.
+5V current is 5.2mA and probably only used for whatever chip
drives the cmos output on pin 1. Turning it on/off has no
effect on the sine-wave output on the SMA connector.
VREF stabilizes at 8.060... V after some hours.
EFC floats at 4.5580... V
[1] It's DB25 but DE9, the second letter is the shell size :-)
Hope this helps...
In message 53208ED8.4090104@sasktel.net, Ed Palmer writes:
Many thanks, Poul.
This info is consistent with the wiring on my unit. By looking and
doing continuity tests, I've found ground on pins 2, 4, 6, and 7. The
wire on pin 3 is red so that's also likely a match to yours for the +5 lead.
Sounds likely.
Good luck, and keep me posted, I'd like to hear how your '107 measure.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
Since I had it out, I decided to let it run and this morning
I measured the EFC characteristic.
In my case perfect frequency is at 4.025V and the sensitivity
is 0.2317 PPM/Volt so the design EFC range is probably +/- 1PPM
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
The specs that I found here:
http://web.archive.org/web/20010302193035/http://www.isotemp.com/ocxo107.htm
say the electrical EFC range is > 0.1 PPM, but that's for the version
with the D/A converter. I can't find any hint about our version.
My unit is starting to settle down. Yesterday aging was in the e-8
range, today it's in the e-9 range. Spec is < 2e-10/day.
Earlier I babbled something about a 200 Hz tuning range. I don't know
what I was thinking. The tuning range is 5 MHz +3 Hz to -7 Hz. So far
the drift has been upwards so I have lots of room to slow it down.
Ed
On 3/14/2014 3:30 AM, Poul-Henning Kamp wrote:
Since I had it out, I decided to let it run and this morning
I measured the EFC characteristic.
In my case perfect frequency is at 4.025V and the sensitivity
is 0.2317 PPM/Volt so the design EFC range is probably +/- 1PPM