Hi
OCXO’s with separate ground for the oven have indeed been made. They do show up
in catalogs and on data sheets. Customers don’t buy them….. The same is true of
the other approach, which is to bring out a separate (isolated) EFC return.
Bob
On Jan 31, 2014, at 11:14 PM, Hal Murray
Fellow time-nuts,
I heard the fan in one of my SR620s and it didn't really was a nice
sound. Has someone found a good replacement fan? Quieter would be nice.
Considering performance checks and calibration this evening.
Cheers,
Magnus
___
time-nuts
Magnus I have a big collector of fans, mostly for Agilent equipment not that it
matters, let me know the dimensions I will see what I have that is quiet.
Cheers;
Thomas Knox
Date: Sat, 1 Feb 2014 18:56:48 +0100
From: mag...@rubidium.dyndns.org
To: time-nuts@febo.com
Subject: [time-nuts]
All,
The REF 102 from TI is a +10 reference with a TC
of 2.5PPM/max. Using two 1% 50 PPM metal film Xcion resistors on can make a +5
V regulator that is
far superior to a 7805. Cost is about $7
from mouser.
If one needs to have an adjustable resistor in a
circuit perhaps one of the digital
Hi Jarl,
On 01/02/14 21:47, Jarl Risum wrote:
Hi Magnus,
I recently sent the following comment to the Time-Nuts list, but it do
not turn up. So I decided to send a copy directly to you:
Thanks
Magnus,
In my SR620 the fan is a Delta DBF0624H which unfortunately seems no
longer to be in
Magnus,
I took an EBMPabst 624. Pabst has a good reputation.
The original fan is a Delta Electronics DFB0624 H, Dimensions are 60mm x
60mm x 25mm, DC24V 0.11A
Volker
Am 01.02.2014 18:56, schrieb Magnus Danielson:
Fellow time-nuts,
I heard the fan in one of my SR620s and it didn't really was
Jarl wrote:
In my SR620 the fan is a Delta DBF0624H. It is a 60x60x25 mm fan, 24V /0.11A.
Mine, too. Does anyone know the airflow rating of the Delta fan? It
does not appear to move as much air as it should (at least not if the
idea is to hold the interior at a fixed temperature) --
Hello The Net,
I just got in the counter and the fan is always ON, even with the front
panel switch OFF.
I looked in the manual but could not find anyway to change this.
The counter has the standard internal 10 MHz reference, but I will be
using a Trimble T'bolt GPS/DO for the external
I know that with the ovenized oscillator the power supply (and therefore fan)
are always on.
Thomas Knox
Date: Sat, 1 Feb 2014 22:50:13 -0500
From: stanw...@verizon.net
To: time-nuts@febo.com
Subject: [time-nuts] New Acquisition: HP-53132A
Hello The Net,
I just got in the counter
Are there any key strokes to determine the software version, other than
a check sum ?
Hi Stan,
Hold recall down as you press power-on to see the firmware version.
It's a very nice counter. I use them all the time. Here's some light reading
for you:
According to the manual (in several places):
*It is normal operation for the fan in the Counter to continue to run after
the Counter is*
*placed in Standby mode. Power to the timebase is continuous to maintain
long term*
*measurement reliability, and the fan helps maintain timebase temperature
What's the best way to open an OCXO in the typical solder-sealed tinned
steel can? I don't mind destroying the can itself, as long as the innards
are not harmed. The goal is to run some experiments with thermal impedance
as discussed here last week, and to ovenize parts of the EFC controller for
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