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Just curious (and I apologize for reincarnating a thread that's almost aI am looking for a handheld Spectrum Analyzer BK2650 (Link1 below) or
Field Strength Analyzer Protek 3290 (Link2). The problem is that I
cannot see the major differences between them, yet there's a major
price difference of $1000-2000. Can anyone tell me what the major
differences between a spectrum analyzer and Field Strength Analyzer?
Is it in demodulation ways, sweep speed, display freq span, or some
extra stuff that I do not need as an amateur/electronics hobbyist?
Er, 20 years ago, I'd say try Douglas or Vector. Or use STD bus hardwareI need to set up a card rack with about 10 cards which will plug into 22/44
pin .156" edge connectors. I need a bus to connect these together. At
present I'm faced with
a) trying to fabricate a PC
b) finding and using wire-wrap connectors
c) hand-wiring "solder cup" connectors together
Obviously the best electrical solution is (a) but trying to create a board
that's 13+ inches long is going to severely tax my capabilities and it while
I could probably design it in EagleCAD and get someone to make up a small
lot of them, I'd much rather order one or two from a manufacturer who has a
variety of designs to choose from. But I haven't found anyone who's line
includes these bus boards. Have I missed something? If so, does anyone
have a URL or address/phone# for a place where I could purchase small
quantities of these. Ideally I'd like a selection of connector styles and
spacings but even having one or two choices would be a great advantage.
For grounded test equipment, one should use two probes, one for theI wish use THS730A to measure two signal with about 160V ~ 200V
floating voltage. Does anyone knows that, will the THS730a be damaged,
if I don't use Tek's P5102 probes.
Please advise. Thanks!
Ted
The THS700s are battery-powered,insulated scopes.Teddy Chiang wrote:
I wish use THS730A to measure two signal with about 160V ~ 200V
floating voltage. Does anyone knows that, will the THS730a be damaged,
if I don't use Tek's P5102 probes.
Please advise. Thanks!
Ted
For grounded test equipment, one should use two probes, one for the
high side, one for the low side, and measure the difference.
In this case, one could use a battery powered DVM (or scope) provided
safety precautions are met, the measuring instrument is insulated from
ground AND one does not touch the equipment when that power is on (!!!).
You'd be surprised how little magazines are archived after 20 years orOn Sat, 30 Oct 2004 09:06:49 -0700, Bob S. wrote:
Hello. Does anyone know were I can find the old BYTE magazine GPIB to
centronics printer interface article. (circa 1979 +/- 4 years)
Regards, Bob S.
Try a library, remember those. That's what we all used before Google.
I'd worry too.Robert Baer <robertbaer@earthlink.net> wrote in
news:418B43B5.9B481FFF@earthlink.net:
Teddy Chiang wrote:
I wish use THS730A to measure two signal with about 160V ~ 200V
floating voltage. Does anyone knows that, will the THS730a be damaged,
if I don't use Tek's P5102 probes.
Please advise. Thanks!
Ted
For grounded test equipment, one should use two probes, one for the
high side, one for the low side, and measure the difference.
In this case, one could use a battery powered DVM (or scope) provided
safety precautions are met, the measuring instrument is insulated from
ground AND one does not touch the equipment when that power is on (!!!).
The THS700s are battery-powered,insulated scopes.
I'd worry about potentials between each probe,though.
No Jim, I am sorry: I don't know anyone. seems you are absolutelyand7@bigfoot.com (TekMan) wrote in
news:6a624601.0411102340.23ef2ceb@posting.google.com:
Jim Yanik <jyanik@abuse.gov.> wrote in message
news:<Xns95986373223CAjyanikkuanet@129.250.170.85>...
..snippety...
I'd worry too.
the Tek 222/222A/222PS had preamps with isolation barrier, seperate
for each of the channels. This technique easily allowd 500V diffrence
between both channels, and still save work (not too high humidity
conditions, of course).
The THS7xx uses a little bit different input technique, so I would not
risk going that high.
hth,
Andreas
Do you know of anyone with component-level schematics of the THS series
scopes?
I believe they're in the same category as TDS scope;no schematics in the
"service" manual.
Andreas,The THS700s are battery-powered,insulated scopes.
I'd worry about potentials between each probe,though.
I'd worry too.
the Tek 222/222A/222PS had preamps with isolation barrier, seperate
for each of the channels. This technique easily allowd 500V diffrence
between both channels, and still save work (not too high humidity
conditions, of course).
The THS7xx uses a little bit different input technique, so I would not
risk going that high.
hth,
Andreas
You have mentioned 160 V and higher in your first posting.and7@bigfoot.com (TekMan) wrote in message news:<6a624601.0411102340.23ef2ceb@posting.google.com>...
The THS700s are battery-powered,insulated scopes.
I'd worry about potentials between each probe,though.
I'd worry too.
the Tek 222/222A/222PS had preamps with isolation barrier, seperate
for each of the channels. This technique easily allowd 500V diffrence
between both channels, and still save work (not too high humidity
conditions, of course).
The THS7xx uses a little bit different input technique, so I would not
risk going that high.
hth,
Andreas
Andreas,
Did you mean that the THS700 will be damaged if I don't use TEK's HV
probe(P5210) for common-mode voltage larger than 30V? Or it's just a
safety consideration for floating voltage?
Well, i have been an electronic technician for over 50 years, and canHello all,
Here is my set up, I have 8 photodetectors, I assume they are in fact
photoresistors but am not sure. I have not been able to get a
resistance measurment when I put a multimeter across it, but I get a
voltage when I touch both probes to the hot wire.
These photo-thingagigs connect to what I assume is a constant current
supply. As best I can figure the current supply corrects for noise in
the line(actually I use a knob on the front to correct for noise) and
as the resistance of the photoresisters change the voltage output of
the current supply changes to maintain a constant amperage. A data
logger captures the change in voltage and I use this data to analyase
and compare different samples. If it help this assumes that as the
light hitting the resistor decreases the resistance increases and
forces an increase in voltage.
Here of course is the kicker, this piece of equipment was cobbled
together by our field service group. Nobody here is willing to touch
the thing, and I am down to a single working photodetector. I dont
know if it is likley to be the current supply or the
photoresistors(assuming of course that they are photoresistors), or
for that matter the datalogger or the datacapture software.
My best guess is that I am using photoreistors and they have burnt out
due to time and use. Is this something anyone has seen before? And
since I have been unable to get a resistance reading off of the
working sensor, what am I missing? Is the resistance from a standard
photoresistor to low to measure with a multimeter, I wouldn't think
so, but God knows I have been wrong before.
Any help appreciated.
Ghostwriters
Jim,
I cannot find any reference in the manual (and I have several
generations) that correlates cal step limit errors to specific circuit
malfuction or point of measurement that is out of spec. The only clues
for CAL 09 from the manual are that limit errors "are generally due to
A or B sweeps, A or B gates, or the measurements PAL" - this doen't
help much since all of the that seems to be working fine and only
steps 2 & 3 have limit errors. Regards,
George Kerber
SNIPOn Sat, 20 Nov 2004 10:22:40 -0800, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> put finger to keyboard and
composed:
Please do us all a favour and report him for spamming the newsgroups.
I'd do it myself but the bastards at Ebay want me to register before
they'll allow me to complain.
- Franc Zabkar
I've written custom code to do this for ignition timing control with aWhere cani find equipment that makes my laptop work as a signal generator
which makes it possible to simulate a crankshaft pickup signal . The
pickup detects
tooths on flywheel for the starter motor.
Ingvar
Norway.
Submitting a TOS complaint to the originating ISP is a good idea; yourLike i mentioned on one of the other NGs that you have posted a number
of times, you have been reported.