Hi
After poking around a bit, more questions that comments.
1) It looks pretty cool.
2) Any idea of what the tool chain was that generated the files? (I probably
need viewing programs that I don’t have)
3) Do they have any plans to bring up the doc’s in English? (even if only
through a
Hi
I would *assume* that either the 20 or 60 MHz is already a square wave. If they
both are, use the 20, if not use
which ever one is a square wave already.
Past that it is just a divide by 2 or a divide by 3 followed by a divide by 2.
You want the last stage to be divide
by 2 so the output
Looks to be Protel aka Altium for the schematics / pcb.
On Sun, Apr 26, 2015 at 2:42 PM, Bob Camp kb...@n1k.org wrote:
Hi
After poking around a bit, more questions that comments.
1) It looks pretty cool.
2) Any idea of what the tool chain was that generated the files? (I
probably need
Hi all,
Have anyone some experience about 10544A repair? I've recently fixed a
10811A, and it is relatively easy to disassemble, but 10544 has not screws
and the manual does not deal about servicing. Can i try to open the box by
removing the white plastic tips without demage something? And
Using GPSDO 10 Mhz as REF signal, I was able to calibrate OCXO. And
now its potentiometer position was nether at its both extremes. The
reading on 5386a (using 10 sec gate) fluctuate from 9.3M to
10.7M. Again, may be I need to wait much longer when OCXO
will be stable.
So,
The problem with using a 1 Hz reference when looking at a nominal 10 MHz
signal is that you will get a stable scope display with no drift when the
input is *any* integer number of cycles/sec. So 10,000,000 Hz will give a
stable display, but so will 9,999,999 Hz and 10,000,001 Hz. Unless you
know
I still work for Tektronix, but not in Service or the sampling scope
product line. I'm a Tektronix field RF Application Engineer.
You can find the service manual for the SD-24 at:
http://www.tek.com/oscilloscope/sd24-manual/sd-24-service-manual But
it's not user repairable, so there are no
All:
Picked up a FE 5680B from Ebay awhile back. Appears to work fine, but is
limited to a 1pps output. However there is a point on the PCB that's documented
that has a 20Mhz output. There is actually a clean 60Mhz output as well.
Hi:
Here is a open source GPIB project that developed by some Chinese amateurs, the
developer released all of the information about hardware and software,
including circuit diagram, PCB diagram, firmware source code, communication
protocol and upper computer PC program (late on). The project
Hi
OCXO’s come in many different “flavors”. Some older units with rack mount
designs may take 1 day simply to warm up. Older AT based units might take 10
minutes simply to stop pulling maximum power.
Stopping the maximum power pull does *not* indicate they are done drifting. Wit
an AT drift
The problem with using a 1 Hz reference when looking at a nominal 10 MHz
signal is that you will get a stable scope display with no drift when the
input is *any* integer number of cycles/sec. So 10,000,000 Hz will give a
stable display, but so will 9,999,999 Hz and 10,000,001 Hz. Unless you
Hello Bob:
To generate program file, you need the KEIL develop environment, or you can
just using HEX file to program MCU directly, the HEX file will put on the GIT
website late time when all software function finished. If anyone interested in
HEX file of current version (not
Hi all,
Sorry for bad english
The transistor Q4 has the emitter and the collector reversed; R12 is connected
to the collector and the waveform is square wave with duty cycle that depends
on the oven temperature; supply voltage = cold, minimun duty cycle = warm.
It is relatively easy to extract
Luca,
You can pry out the plastic pins easily.
Then remove the thin foam piece.
Then if I remember correctly you will have to diagram where each color of
wire goes to the edge connector and then unsolder them.
Now you can remove the guts, some pressure on the tuning capacitor thru
the hole
Dave,
The trick is to closely synchronize your 1PPS generator, whether you use the
1970's method of a string of seven '7490 decade divider chips (common reset) or
a 1900's method of a sync'able MCU divider such as a picDIV
(http://www.leapsecond.com/pic/picdiv.htm).
It's so simple it's
Yeah, I considered saying that. But if you don't have a TI counter, you
need some way of resetting the divide-by-1e7 chain so the two 1 Hz pulses
are close enough in time that you can see them on the scope at some
reasonably fast sweep rate. Yes, you can used delayed sweep, but how
stable is the
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