); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
I'm looking for a digital scope. Is there some obvious model(s) that I
should keep an eye out for?
I don't need one, so I'm willing to wait and I'm flexible on parameters.
Mostly what I'm looking for is:
reasonable
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Hal Murray wrote:
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
I'm looking for a digital scope. Is there some obvious model(s) that I
should keep an eye out for?
I don't need one, so I'm
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Gentlemen,
again my question is a bit OT: Has anyone of you personal experience
with QCMs (Quarz Crystal Microbalances) and give me a recommendation on
a) what surface coating is suggested if the aim is to measure small
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Hal Murray said the following on 10/24/2007 03:47 AM:
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
I'm looking for a digital scope. Is there some obvious model(s) that I
should keep an eye out
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Hi John
I think I have the perfect suggestion for you.
I spent 200+ hours researching scopes before I started my business,
primarily because I am a cheap bastard. I finally found what I wanted,
at the price I wanted. Please
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Hi Brooke
I am not exactly sure. You can go into the uS range but I had better
check with the Bitscope people about the exact details. I will forward
this email. I am sure you will have an answer tomorrow.
-Patrick
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
I was wondering about that! :-) Patrick
Brooke Clarke wrote:
Hi Patrick:
That should be 10 us not 0 us.
Thanks Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Hi Tom I dont think you need the resistors these are current limited and the
sense is inside the chip so the resistors dont do anything (you are thinking
of a negative feedback effect). All that happens in paralled operation is
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Alan Melia wrote:
Hi Tom I dont think you need the resistors these are current limited and the
sense is inside the chip so the resistors dont do anything (you are thinking
of a negative feedback effect). All that happens in
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Magnus Danielson wrote:
It is not that hard to acheive 2 A at 24 V after all. The old uA723 and
variants would probably do the trick good enought for you with external
transitor(s).
I recommend to at least include
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Tom C,
As Bruce notes below, the LM338K is a 5 amp job with a 35v max DC input
rating.
Just allow adequate heatsinking otherwise the 338 will foldback due to
over temperature.
There's plenty of on-line help to select the
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
But he knows the period already to parts in 10e-9 or better. His
email sez it's a PPS signal ex an Rb source.
Not much point in trying to measure that with a scope timebase!
So I still think he wanted to measure the ~10uS
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Tom Clifton [EMAIL PROTECTED] wrote:
A question for those that might know (or have an
opinion)... I have in hand an LPRO rubidium reference
that requires 1.7 amps at 24 volts while the oven
warms, dropping to 500ma while
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Hi Dave:
The problem is I don't have any documentation on the O-1814. The label does
not say Frequency Standard or anything else about what it does. There is a
very nice Rb source (M-100) inside and front panel connectors
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
I tried the SR620. It's bouncing around a 32 Hz period.
Brooke,
You have a house standard, right? (GPSDO or cesium). Use
your SR620 to take a set of N (10 or 100) TI measurements
between your local reference and the O-1814
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Thanks for all the good feedback! Looks like the LM388
is the way I'm to go. Got to toddle off to the local
surplus shop in the morning to see what they have in
the goodie bin. If they don't have it eBay is full of
them.
Tom
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
christopher hoover wrote:
Tom,
Most of the oven circuits will tolerate a significant sag in potential
during warm-up as long as the supply doesn't cut out. I've often run OCXO's
and Rb's off a wimpy bench supply when my
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Hi Tom:
When I had that problem a work around was to parallel a battery with the power
supply (using a diode). The battery supplies the extra current while the oven
warms up. If the power supply voltage is a little higher
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Hi Tom,
If you really want to regulate the oven`s supply voltage, my National
Voltage Regulator handbook shows that the LM317T will supply over 2 Amps,
with an input/output differential of between 5, and 12.5 Volts. A
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Don Collie wrote:
Hi Tom,
If you really want to regulate the oven`s supply voltage, my National
Voltage Regulator handbook shows that the LM317T will supply over 2 Amps,
with an input/output differential of between 5,
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Hi Ulrich,
Ulrich Bangert wrote:
Has anyone of you personal experience
with QCMs (Quarz Crystal Microbalances) and give me a recommendation on
a) what surface coating is suggested if the aim is to measure small
amounts of
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Bollocs, Bruce! If National say it will do it, you can bet that it will. An
LM338K will do the job too, but in my opinion it`s overkill, and in the
event of a short circuit on the output of the regulator the current for the
22 matches
Mail list logo
