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On Mon, 3 May 2004 02:28:46 -0400, Active8
wrote: On Sun, 02 May 2004 11:35:08 -0500, John Fields wrote: On Sun, 02 May 2004 09:04:33 -0500, John Fields wrote: snip John helping Paul with terminology http://www.maxim-ic.com/appnotes.cfm/appnote_number/972 Once in a while, I can post a helpful link (I've got plenty of tech info links, but most don't usually apply to the topic at hand whatever that may be) , but some of you guys, like Spehro, You, etc., ... it's like you can pull horshoe out of yer asses :) You must do more digging than I do. Yup, John Chrighton's another one that springs to mind as being very good at sniffing stuff out on the Web. I'd often wondered what these "pads" were for. I'd been a bit concerned to note that the output amplitude varied quite markedly when sweeping the generator through it's frequency range when measuring the 'open circuit' voltage with a 'scope. I guess now I know why. Thanks, guys. -- The BBC: licenced at public expense to spread lies. |
On Mon, 3 May 2004 02:28:46 -0400, Active8
wrote: On Sun, 02 May 2004 11:35:08 -0500, John Fields wrote: On Sun, 02 May 2004 09:04:33 -0500, John Fields wrote: snip John helping Paul with terminology http://www.maxim-ic.com/appnotes.cfm/appnote_number/972 Once in a while, I can post a helpful link (I've got plenty of tech info links, but most don't usually apply to the topic at hand whatever that may be) , but some of you guys, like Spehro, You, etc., ... it's like you can pull horshoe out of yer asses :) You must do more digging than I do. Yup, John Chrighton's another one that springs to mind as being very good at sniffing stuff out on the Web. I'd often wondered what these "pads" were for. I'd been a bit concerned to note that the output amplitude varied quite markedly when sweeping the generator through it's frequency range when measuring the 'open circuit' voltage with a 'scope. I guess now I know why. Thanks, guys. -- The BBC: licenced at public expense to spread lies. |
On Mon, 03 May 2004 12:56:07 +0100, Paul Burridge
wrote: On Sun, 02 May 2004 22:37:28 GMT, (John Crighton) wrote: Go on, tell us the model number, there are a lot of us still interested in boat anchor style test equipment. Is this unit similar to your sig gen http://www.thevalvepage.com/testeq/avo/sg3/sg3.htm http://www.thevalvepage.com/testeq/testeq.htm Unfotunately the connector has been removed and a BNC type fitted. Not really similar to any of them, I'm afraid. Model number is CT 378B. I did recognise that old Advance E2, though. Had one of 'em about 25 years ago. It was pretty ancient then! I am guessing that you want to keep the original connector on the sig gen and find a matching connector to make a short test lead. Old Style connector to BNC. My news group service doesn't allow me to see the group a.b.s.e Pity. So I can not see the picture you posted. Pity. Hopefully some kind soul will post it onto a web site for you. I can't as I have no FTP s/ware installed at present. --- Can't you just email it to him? -- John Fields |
On Mon, 03 May 2004 12:56:07 +0100, Paul Burridge
wrote: On Sun, 02 May 2004 22:37:28 GMT, (John Crighton) wrote: Go on, tell us the model number, there are a lot of us still interested in boat anchor style test equipment. Is this unit similar to your sig gen http://www.thevalvepage.com/testeq/avo/sg3/sg3.htm http://www.thevalvepage.com/testeq/testeq.htm Unfotunately the connector has been removed and a BNC type fitted. Not really similar to any of them, I'm afraid. Model number is CT 378B. I did recognise that old Advance E2, though. Had one of 'em about 25 years ago. It was pretty ancient then! I am guessing that you want to keep the original connector on the sig gen and find a matching connector to make a short test lead. Old Style connector to BNC. My news group service doesn't allow me to see the group a.b.s.e Pity. So I can not see the picture you posted. Pity. Hopefully some kind soul will post it onto a web site for you. I can't as I have no FTP s/ware installed at present. --- Can't you just email it to him? -- John Fields |
"Ralph Mowery" wrote in message ... My main sig gen states "output EMF using 6dB pad" next to the socket. WTF is a "6dB pad"? -- [...snip...] For the calibration to be accurate on your generator it sounds like the scale is calibrated so you need the 6 db pad after it. A 5 db pad will reduce the power by a factor of 4 or a voltage by a factor of 2. That last 5 should be a 6. -- Steve N, K,9;d, c. i My email has no u's. |
"Ralph Mowery" wrote in message ... My main sig gen states "output EMF using 6dB pad" next to the socket. WTF is a "6dB pad"? -- [...snip...] For the calibration to be accurate on your generator it sounds like the scale is calibrated so you need the 6 db pad after it. A 5 db pad will reduce the power by a factor of 4 or a voltage by a factor of 2. That last 5 should be a 6. -- Steve N, K,9;d, c. i My email has no u's. |
"Paul Burridge" wrote in message ... Hi, I have a spare RF signal generator that has an unmarked output from a type of socket I've never seen before. What's the simplest way of establishing its output impedance? I've had a few ideas but no doubt someone out there will know of something better, since I always seem to end up making unnecessary work for myself. Any suggestions? p. -- The BBC: licenced at public expense to spread lies. One more thing to keep in mind, Paul. Over here in the US it is and has for a long time been standard to display the LOAD level on the generator output indicator. That is, the voltage (or power) at the load itself (assuming matched). In the UK - but I don't know about recently, it was common to show the generator EMF -- which meant the internal generator voltage. This would be twice what would appear across the load if the load & source Z were equal. From your Sig you may very well be familiar with the EMF designation... -- Steve N, K,9;d, c. i My email has no u's. |
"Paul Burridge" wrote in message ... Hi, I have a spare RF signal generator that has an unmarked output from a type of socket I've never seen before. What's the simplest way of establishing its output impedance? I've had a few ideas but no doubt someone out there will know of something better, since I always seem to end up making unnecessary work for myself. Any suggestions? p. -- The BBC: licenced at public expense to spread lies. One more thing to keep in mind, Paul. Over here in the US it is and has for a long time been standard to display the LOAD level on the generator output indicator. That is, the voltage (or power) at the load itself (assuming matched). In the UK - but I don't know about recently, it was common to show the generator EMF -- which meant the internal generator voltage. This would be twice what would appear across the load if the load & source Z were equal. From your Sig you may very well be familiar with the EMF designation... -- Steve N, K,9;d, c. i My email has no u's. |
On Mon, 03 May 2004 10:44:14 -0500, John Fields
wrote: On Mon, 03 May 2004 12:56:07 +0100, Paul Burridge wrote: On Sun, 02 May 2004 22:37:28 GMT, (John Crighton) wrote: Go on, tell us the model number, there are a lot of us still interested in boat anchor style test equipment. Is this unit similar to your sig gen http://www.thevalvepage.com/testeq/avo/sg3/sg3.htm http://www.thevalvepage.com/testeq/testeq.htm Unfotunately the connector has been removed and a BNC type fitted. Not really similar to any of them, I'm afraid. Model number is CT 378B. I did recognise that old Advance E2, though. Had one of 'em about 25 years ago. It was pretty ancient then! I am guessing that you want to keep the original connector on the sig gen and find a matching connector to make a short test lead. Old Style connector to BNC. My news group service doesn't allow me to see the group a.b.s.e Pity. So I can not see the picture you posted. Pity. Hopefully some kind soul will post it onto a web site for you. I can't as I have no FTP s/ware installed at present. --- Can't you just email it to him? Oh yeah. I forgot about that! Better ask here first though, as it's a binary and might not be welcome. I've also taken a shot of the whole gen., John. I can certainly e-mail the pics to you if you're that interested in boat anchors (although this one's only 25lbs so hardly qualifies). My Marconi, OTOH, has got to be 3 times that much at least... -- The BBC: licenced at public expense to spread lies. |
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