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Michael Dunn
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Keeping Photos Small:

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Hello TekScope Community,

apologies for the slightly OT; please admit the following questions:

I am looking for informations about Trace Math in the HP 3589A
Spectrum / Network Analyzer.
The Product Data Sheet merely mentions some characteristics of this
feature.
The HP 3589A Operator?s Guide downloaded the from the Agilent website
doesn?t even mention this feature.

Does anybody have any further informations about or experience with
Trace Math syntax in this Model?
Or do I miss a dedicated manual covering this topic?

Any hint will be highly appreciated.

Regards
Martin

mailto:Martin.Fischer@...

There should be no birdies whatsoever except for the big one at 0 Hz. You
have a problem (possibly bad cabling in the front end, although what local
signals would be coming through at 41 MHz and 300 MHz, I don't know...)
Interrupt the RF signal path (as recommended in my earlier reply) until you
see where they're coming from.

-- john, KE5FX

Exactly, that is why I'm asking.
because for no input my 492 is absolutely clean in the
range 0 to 1.8GHz.

lc.

i normally look for birdies with no input "shorted with a terminator" when checking a radio receiver or spec ana

Chris,

With what signal at the input ?

Luis C.
ct1dmk.

I've got a 492 that I haven't had for very long and I'm still
exploring the possibilities with it. It has options 1,2, and 3.


It's a very clean performer and seems to meet its sensitivity specs
and is reasonably close to calibrated.


I do notice a few birdies in it, and while I don't expect any spetrum
analyzer to be entirely free of birdies, I'd just like to know if the
ones I'm seeing in this unit are about normal.


Of course it has some noise below 100 MHz. I see a spur at about 34
MHz that's about 20 dB above the noise floor with the video filter set
to narrow.

At 41 MHz, there's another spur that's about 15 dB above the noise floor.

At 50 MHz, +25 dB.

At 69 MHz, +8 dB.

At 75 MHz, +12.

At 85 MHz, +19

At 93 MHz, +20.

At 99 MHz, +18.

At 100 MHz, +19.

There's a big one at 300 MHz, +25.

At 350 MHz, +20.

At 400 MHz, +10.

At 500 MHz, +10.

Below 100 MHz, there are smaller spurs between the larger ones,
typically less than 10 dB above the noise floor.

Above 500 MHz, it's very clean.

The apparent magnitude of the spurs does vary somewhat according to
the span and resolution in use.

All figures reported are in minimum noise mode with the ref level and
attenuation adjusted to as to yield the largest apparent magnitude
of the spurs.


So is this about right for a 492 or is it more in need of calibration
(or even repair) than I thought?


CJ

Good day,

A friend of mine has offered me two tube scopes of unknown provenance,
he believes however that they are not working. They are

Type 581 Serial #001067
Type 535A Serial #025668

BAMA has provided me with manual for the 535A (even seems to be the
right vintage), but I came up short on the 581 - any pointers? I
don't know what/if any plugins will be coming (the scopes are
currently a long way away from both of us).

This will be my first foray into the earlier offerings from Tek. I
understand that both of these scopes will use letter and 1-series
plugins, the 581 needing the 81 adapter. Any other gotchas? I will
of course peruse the archives, but I would welcome any tips useful to
someone used to working on 7000-era gear. Ahh, yes, I know that the
voltages tend to be a bit higher, and that I probably could stand to
get a 100x probe!

I'm need fairly urgent need of a working PS503 and there don't seem to
be any around at the usual places. If anybody has one surplus to
requirements please let me know. Location Australia.

TIA

EJP

But the charge on even a pretty large CRT, at least in the olden
times, before flatscreens, had pretty impressive HV like 25 kV, and
you can get a nasty surprise, but not worse. After all, it's DC,and
the capacitance isn't all that large.

Now, I know this is going to provoke a lecture and thread ad infinitum
(you know who you are), but really, we did take at least *some* care,
like making sure a five tube ac/dc set really had the chassis at
neutral and that neutral and hot weren't interchanged. Of course
you're going to get shocked if you reach stupidly into a power supply
that has a 300-0-300 VAC transformer secondary, but if you're lucky,
it'll be the dc which *will* fling you across the room, not lock your
muscles and kill you. People learn fast from such experiences, at
least those who didn't grab the transformer secondary with both hands.

I know that I was immensely pleased to have the transistor come along
just at the right time to spare me shocks but mostly wiring the
accursed filaments.

Regards,

Jonathan





--- In TekScopes@..., Kuba Ober <ober.14@...> wrote:

1. With all power off to everything, discharge the test point I

plan to

probe to ground. In other words , I treat it like a big capacitor. As
we know , even with all protection in place, if you "get across" a big
cap in a DUT you can be on the way to the undertaker

You're right, but it doesn't have to be big, or even a designated

capacitor.

Mind the parasitics! The CRT with its parastic anode capacitance is

enough to

zap you big time.

Cheers, Kuba

There is no surplus stores in the Charleston area that have electronic equipment. There will be a hamfest in the Charleston area Feb 3, 2007.

73
Glenn
WB4UIV

Kuba Ober wrote:

1. With all power off to everything, discharge the test point I plan to
probe to ground. In other words , I treat it like a big capacitor. As
we know , even with all protection in place, if you "get across" a big
cap in a DUT you can be on the way to the undertaker

You're right, but it doesn't have to be big, or even a designated capacitor. Mind the parasitics! The CRT with its parastic anode capacitance is enough to zap you big time.

Also while the "shock" might not kill you, falling backwards
or bumping into something from your reflexive action might
cause you to break your neck or get impaled on something, or
have something big fall on top of you.

mike

found this link searching for another document:



Guess everybody has known that one since years :)

Cheers,

Andy

Hi Folks,

My instruction manual for my B&K 3050 sine/square generator is missing
the schematic. If it's like my other B&K test equipment, the
schematic is generally just a folded loose sheet inserted into the
back of the manual. Anyway, mine is missing.

Can anyone help me out?

Thanks,
Mike, WB0LDJ

Kuba Ober wrote:

My assumption is that they are hijacking accounts.
I've recently sold, but not received payment or
shipped, a lovely Sencore SG80.

Why did you ship before being paid?!

Read again: "but not received payment or shipped, a lovely..."

The bidder was from Bulgaria; he called and everything. His website was
awesome! I don't believe they have PayPal in the
Baltic States and was warned to beware.

Turns out that he wanted to make a wire transfer.
Hmmmmm, account info.

I don't know where's the problem in the US mentality about not giving out the bank account numbers. If your bank is so bad that someone just knowing your address and account number can do unauthorized transactions, you're gonna be screwed anyway -- look for a better bank.
In Europe, bank account numbers appear on stationery -- next to the address, along with VAT/EIN numbers etc. To do a transaction, you either have to go online and have the credentials (password & token-generated number), or have a proper ID and go to the branch. Easy.

I'd like to amplify one thing further. Everything that is needed for a
wire transfer *into* your account is on the bottom of your check.

There really isn't any reason to worry. Your bank will *not* wire anything
out of your account unless you have prearranged the transaction. You can
do it by phone, but it will require you to know all of the magic numbers
and runes both they, and you know about you.

-Chuck Harris

I am searching for a TM5006 rack and they are at this moment often on
ebay.
The only problem is the transportcost which will is very high for
sending to Europe.
Does somebody know a TM 5006 rack for sale in the neighbourhood of
Charleston SC (which I will visit next week).
Also an address from a electronic surplus store in Charleston SC is
welcom

[snip]

The bidder was from
Bulgaria; he called and everything. His website was
awesome! I don't believe they have PayPal in the
Baltic States and was warned to beware.

Last time I looked, the Baltic states were Estonia, Lithuania, and
Latvia.

Bulgaria is in the Balkans.

-John

My assumption is that they are hijacking accounts.
I've recently sold, but not received payment or
shipped, a lovely Sencore SG80.

Why did you ship before being paid?!

The bidder was from
Bulgaria; he called and everything. His website was
awesome! I don't believe they have PayPal in the
Baltic States and was warned to beware.

Turns out that he wanted to make a wire transfer.
Hmmmmm, account info.

I don't know where's the problem in the US mentality about not giving out the
bank account numbers. If your bank is so bad that someone just knowing your
address and account number can do unauthorized transactions, you're gonna be
screwed anyway -- look for a better bank.

In Europe, bank account numbers appear on stationery -- next to the address,
along with VAT/EIN numbers etc. To do a transaction, you either have to go
online and have the credentials (password & token-generated number), or have
a proper ID and go to the branch. Easy.

BTW, you do know that you can instantly open an empty "receive-only" online
checking account at most banks? Who said you can only have one checking?

Cheers, Kuba

1. With all power off to everything, discharge the test point I plan to
probe to ground. In other words , I treat it like a big capacitor. As
we know , even with all protection in place, if you "get across" a big
cap in a DUT you can be on the way to the undertaker

You're right, but it doesn't have to be big, or even a designated capacitor.
Mind the parasitics! The CRT with its parastic anode capacitance is enough to
zap you big time.

Cheers, Kuba

The subject says it, but it isn't fully ot: The C1-122 is a Tektronix
7603 lookalike, the 1st. was the C1-91, the C1-122 ist the 2nd. edition,
Plugins have the same connector Pinout but with metric pin distances and
the Plugins are a mechanically a little greater.
It should be possible to get a Tek 7000 Plugin to work in those scopes
whit an mechanical adapter, but not vice versa...

The electronics are totally different...

I've got this scope from ebay for only 1,99 Euros, with the hint, that
there is something wrong in the HV supply. I've found, that both fuses
on the primary side of the main PSU are blown, so I've searched first in
the PSU for problems (that is a mechanical hell, had to remove around
40 screws to get to the switching transistors....).
Unfortunately the HV plate was fallen out of the assembly, disconnecting a
few of the connectors and I don't know where tho plug them now (only 3
connectors, 5 wires), so I need a shematic from the PSU to reconnect them
properly.

Can someone here help me please?

Kind Regards,

Holm

PS:

ebay number is 190068339560 for those who are interested in a picture of
the C1-122...

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