Products > Test Equipment

Test Equipment Anonymous (TEA) group therapy thread

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tautech:

--- Quote from: bd139 on May 04, 2018, 07:55:46 am ---
--- Quote from: tautech on May 04, 2018, 07:43:58 am ---
--- Quote from: bd139 on May 04, 2018, 06:26:21 am ---Talking of GPS I think I (or my youngest) killed my QRP Labs GPS module. It's not responding now. Was sitting there on the window sill. There was a two hour opportunity where my youngest may have got at it but I couldn't see any finger prints on the board!

Haven't replied to any of the GPS antenna posts yet but have been reading them. I'm looking at permanent antenna options as well so this thread is interesting  :-+

--- End quote ---
Oh c'mon, that's not fair blaming the kids ! The littlest one at that !

Or is penis fingers not wanting to own up ?  :P

--- End quote ---

The face and spit marks on the window next to it are a clue :)

Despite drinking half a keg the other day I don’t remember doing that.

--- End quote ---
Sounds like those PF genes are being passed on.  :-DD

tggzzz:

--- Quote from: Specmaster on May 03, 2018, 11:54:47 pm ---
--- Quote from: tggzzz on May 03, 2018, 11:40:07 pm ---
--- Quote from: Specmaster on May 03, 2018, 11:02:21 pm ---Still a little puzzled about this seeing as the only 50 ohm inputs I have are the TF930 and the HP1740A which is switchable between 50ohm and 1M, all the other scopes tend to be 1M and also of course the TF930 can also be switched between 1M and 50ohm. If IIRC the only time the 50ohm input on the 1740A gets mentioned really is on some specific calibration tests?

--- End quote ---

The excellent "low" impedance Z0 "resistive divider" probes have to be terminated in 50ohms, as do other classes of probes.

Those are actually a higher input impedance than so-called "high" impedance *10 probes (when input capacitance is included), and have a much higher bandwidth. Examples: 1.5GHz HP10020A or 6GHz HP54006A.

--- End quote ---
Why would I be attaching probes to a signal generator?

--- End quote ---

I presumed you would be attaching the probe to the 1740, which is (when I looked 2 minutes ago) a scope.


--- Quote ---I'm more likely am I not (unless I'm missing something) be using a a lead terminating in a BNC at one end and a pair croc clips at the other. The highest bandwidth scope I'll be using is 100MHz. I'm only using the signal generator for normal domestic radio broadcast radios between 100 KHz and 108MHz?

--- End quote ---

In that case I have little idea what you are trying to achieve.

bd139:

--- Quote from: tautech on May 04, 2018, 08:13:25 am ---Sounds like those PF genes are being passed on.  :-DD

--- End quote ---

I'm going to have to re-sign-up for the forum as user PenisFingers  :-DD

Specmaster:
Yes I will be doing that as well, there is a dedicated output for that and another for RF. I also hook up the other sig gen to the scope at times too.
--- Quote from: tggzzz on May 04, 2018, 08:16:45 am ---
--- Quote from: Specmaster on May 03, 2018, 11:54:47 pm ---
--- Quote from: tggzzz on May 03, 2018, 11:40:07 pm ---
--- Quote from: Specmaster on May 03, 2018, 11:02:21 pm ---Still a little puzzled about this seeing as the only 50 ohm inputs I have are the TF930 and the HP1740A which is switchable between 50ohm and 1M, all the other scopes tend to be 1M and also of course the TF930 can also be switched between 1M and 50ohm. If IIRC the only time the 50ohm input on the 1740A gets mentioned really is on some specific calibration tests?

--- End quote ---

The excellent "low" impedance Z0 "resistive divider" probes have to be terminated in 50ohms, as do other classes of probes.

Those are actually a higher input impedance than so-called "high" impedance *10 probes (when input capacitance is included), and have a much higher bandwidth. Examples: 1.5GHz HP10020A or 6GHz HP54006A.

--- End quote ---
Why would I be attaching probes to a signal generator?

--- End quote ---

I presumed you would be attaching the probe to the 1740, which is (when I looked 2 minutes ago) a scope.


--- Quote ---I'm more likely am I not (unless I'm missing something) be using a a lead terminating in a BNC at one end and a pair croc clips at the other. The highest bandwidth scope I'll be using is 100MHz. I'm only using the signal generator for normal domestic radio broadcast radios between 100 KHz and 108MHz?

--- End quote ---

In that case I have little idea what you are trying to achieve.

--- End quote ---

From mobile device so predictive text might have struck again [emoji83]

Specmaster:

--- Quote from: tggzzz on May 04, 2018, 08:16:45 am ---
--- Quote from: Specmaster on May 03, 2018, 11:54:47 pm ---
--- Quote from: tggzzz on May 03, 2018, 11:40:07 pm ---
--- Quote from: Specmaster on May 03, 2018, 11:02:21 pm ---Still a little puzzled about this seeing as the only 50 ohm inputs I have are the TF930 and the HP1740A which is switchable between 50ohm and 1M, all the other scopes tend to be 1M and also of course the TF930 can also be switched between 1M and 50ohm. If IIRC the only time the 50ohm input on the 1740A gets mentioned really is on some specific calibration tests?

--- End quote ---

The excellent "low" impedance Z0 "resistive divider" probes have to be terminated in 50ohms, as do other classes of probes.

Those are actually a higher input impedance than so-called "high" impedance *10 probes (when input capacitance is included), and have a much higher bandwidth. Examples: 1.5GHz HP10020A or 6GHz HP54006A.

--- End quote ---
Why would I be attaching probes to a signal generator?

--- End quote ---

I presumed you would be attaching the probe to the 1740, which is (when I looked 2 minutes ago) a scope.


--- End quote ---

Yes I will be attaching a probe to the scope and that probe will generally be attached to the radio receiver at a different point to the signal generator  :-//

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