[time-nuts] Any Isotemp OCXO107-10 Info?
ed_palmer at sasktel.net
Wed Mar 12 12:44:08 EDT 2014
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.
On 3/12/2014 2:31 AM, Poul-Henning Kamp wrote:
> In message <531F7161.2080300 at 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 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
>  It's DB25 but DE9, the second letter is the shell size :-)
> Hope this helps...
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