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Re: 1S1 Serial No. 100396 Guernsey
Sampling scopes have DC offset, which may be a multi-turn or a coarse/fine control.This could drive the trace way off screen.Does it behave the same in both plugin slots ?
Since you said you were not familiar with samplers, I'll point out that the input is 50 ohms. ?HankC, Boston WA1HOS [Non-text portions of this message have been removed] |
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Re: Help in using TEK Differential Amp to check Switchmode Supplies
On Wednesday, November 19, 2014 15:20:51 you wrote:
On 11/19/2014 2:32 PM, Stefan Trethan stefan_trethan@... [TekScopes]I have one, I use it with a 485. Pretty satisfied with it. I consider it "basic equipment". I have taken it up to 2.6KV working on Z axis circuits with no ill effects. I see them with higher voltage ratings too. I'm thinking of one as a stocking stuffer for myself. Mike -- Mike McGinn KD2CNU Be happy that brainfarts don't smell. No electrons were harmed in sending this message, some were inconvenienced. ** Registered Linux User 377849 |
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Re: Help in using TEK Differential Amp to check Switchmode Supplies
On 11/19/2014 2:32 PM, Stefan Trethan stefan_trethan@... [TekScopes]
wrote: Has anyone on this list tried the 100X 2KV probes from China? Thanks, Bert
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Re: Help in using TEK Differential Amp to check Switchmode Supplies
Stefan Trethan
On a flyback supply that is the truth, yes.
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Up to 800V Mosfets, are not uncommon. Apart from the voltage rating, x10 may mean no more than 50V/DIV on some scopes, making it completely impractical to use an x10 probe for 230V work, depending on the scope. ST On Wed, Nov 19, 2014 at 8:22 PM, David Thomas 101322.3271@... [TekScopes] <TekScopes@...> wrote: "... adequate for 240 VAC work which is unlikely to produce higher than |
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Re: Help in using TEK Differential Amp to check Switchmode Supplies
"... adequate for 240 VAC work which is unlikely to produce higher than
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+/- 340 volts DC...." Erm, guys, if these are switched mode supplies on a 240V system, when the switching transistor switches OFF, peak voltage on the switching transistor \ primary winding can easily reach 500 volts or more! (I know - I have had to design them and specify the Vds max of the switching FET... we used to fit 600V Vds max for 230 \ 240V....). Think "car ignition coil" on the primary side of the "transformer".... A 240V supply might only produce 340VDC on the bulk cap, though.... David Thomas On 16/11/2014 11:40, David davidwhess@... [TekScopes] wrote:
1. The x10 P6055 probes have adjustable DC attenuation but are only |
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1S1 temperamentalisms re #100396
Tim Phillips
from Tim P (UK)
re the difficulty triggering these beasts, I have four - one works perfectly, one 'sort-a-works' with a fast trigger, one is very iffy and the other one has never worked, and is effectively a parts-donor. I agree that a fast, sharp trigger is needed; mine usually work OK with a PG501. I suspect that the TDs in the trigger-recogniser circuit may have drifted. Also there is a (I think) blanking trace which is deflected off-screen downwards but can be seen with too much offset or Vpos. It is much dimmer than the correct trace. HTH Tim |
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Re: Windows (OT)
On Wed, Nov 19, 2014 at 11:07 AM, David DiGiacomo <telists@...> wrote:
Type this in a command window:Hmm, Windows Update is temporarily (?) broken, at least for some people: Automatic updates seem to be working though. |
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Re: Windows (OT)
On Wed, Nov 19, 2014 at 10:57 AM, John Griessen <john@...> wrote:
Type this in a command window: reg add HKLM\SYSTEM\WPA\POSReady /v Installed /t REG_DWORD /d 1 /f Then run Windows Update/Microsoft Update as normal. |
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Re: 1S1 Serial No. 100396 Guernsey
It's important to point out that sampling plug-ins drive the horizontal display of the scope.
Make sure it's connected to the scope the right way. There's a free run setting for the trigger. I haven't used a 1S1 in a while, I don't really know anymore what free run does, but let's try that. I recall you can display a line with no input. |
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Re: Weird cursor problem on 2465 scope
It turned out to be a faulty C853 on the main board. I put a DMM across it in circuit and got about 300 ohms, even when I reversed the leads. That seemed suspicious to me so I lifted one of the leads. Still measured 300ish ohms. Did a quick capacitance check and instead of 0.47uf, I got 0.02nf. Not a happy capacitor. Congrats on finding your issue. I guess if panos' 2445 has the same issue, a quick way to diagnose it would be to measure the DLY_REF line resistance ground and the -1.25V "rail". The easiest way to do it is probably by disconnecting P511 from the A5 board, and measuring at the connector. |
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Re: 1S1 Serial No. 100396 Guernsey
This sounds awfully similar to the behaviour of the 7S11/7T11 combination
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when it isn't triggering. It doesn't really semm to have an "Auto" mode, and dives off screen (downwards) if you don't get the stability/trigger controls set right. If find it very tricky to get a decent trigger every time I use them. Regards, David Partridge -----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] Sent: 19 November 2014 13:29 To: TekScopes@... Subject: [TekScopes] Re: 1S1 Serial No. 100396 Guernsey Also, I have a couple of these 1S1's and get the same response from both. So, either they both share the same fault or more likely, I don't know how the heck to run my scope. I suspect the latter. But anything is possible I suppose. I am at first trying to determine which of the two plug-ins to restore. Then I can go from there. I do have an extension cable for the scope and plug-in, but had not wanted to move forward until I spoke with you all here. My next step was going to be just go through the CAL procedure and check all the power supplies in the PI and hopefully reveal something there. I would like to at least try to get this "trace to appear, as the restoration might be simple. HA!!! Thanks for the help folks. Cheers, David ------------------------------------ Posted by: d.garrido@... ------------------------------------ ------------------------------------ Yahoo Groups Links |
David C. Partridge
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