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Re: Frequency response flatness in conventional sampling (say 7S11/S
Albert
Hi David,
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So far I didn't find effect of S-6 blow-by adjustment on sine wave amplitudes. I probably did something wrong, since the effect on square waves (tilt) is considerable. A change of C20 in the S-6 only causes a vertical shift of the sine wave. I tested some frequencies from 100 kHz to 1 GHz. It's very annoying that the SG503 and my GR-type oscillators don't have a trigger output. Since the S-6 doesn't have a trigger output either I'm forced to use a CT-3 trigger pick-off and external triggering. With the S-2 I can compare internal triggering (CT-3 omitted) with such external triggering. The CT-3 has considerable effect on frequency response, about 6% to 8% downward trend when frequency is increased to 900 MHz. Albert --- In TekScopes@..., David <davidwhess@...> wrote:
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Re: 454A vs 465B Recommendation
On Mon, Feb 18, 2013 at 9:25 AM, Frank Edwards <fmedwards3@...> wrote:
I have an opportunity to get either a 454 or 465. Spec wise, either will meet my need, both are working and there is no difference in cost. From what I have read, the 454 contains no proprietary parts and can therefore be repaired using common off-the-shelf parts, vs the 465 which has some proprietary parts but is newer. It seems to me there are many more 465s available, but I have not been looking for any particular part. My intent is to get a scope that will not become economically unrepairable because of availability of repair parts. In summary, from a reliability and repairability perspective, which should be the better option?Just about the same question was asked last month: |
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Re: 454A vs 465B Recommendation
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Re: What is this item
Albert
Hi Herbert,
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The confusing situation is that there were two different probes (a voltage probe and a current probe) with the same number P6022. Maybe not at the same time. Last mention of the voltage probe was in 1962. The probe at ebay is the voltage probe. Albert it is a current probe, for use on 1MOhm inputs with P6022 at Tektronix Catalog 1962 page 192. |
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454A vs 465B Recommendation
I have an opportunity to get either a 454 or 465. Spec wise, either will meet my need, both are working and there is no difference in cost. From what I have read, the 454 contains no proprietary parts and can therefore be repaired using common off-the-shelf parts, vs the 465 which has some proprietary parts but is newer. It seems to me there are many more 465s available, but I have not been looking for any particular part. My intent is to get a scope that will not become economically unrepairable because of availability of repair parts. In summary, from a reliability and repairability perspective, which should be the better option?
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Re: What is this item
¿ªÔÆÌåÓýHi Albert,it is a current probe, for use on 1MOhm inputs with and Bandwidth equal or larger than 300 MHz. ? 1mA / 1mV (8,5kHz - 100 MHz) 10mA/1mV (935Hz -? 120 MHz) usefull for development in switched PSU and similar! Herbert Am 18-02-2013 11:27, schrieb Albert: ? |
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Unusual TM500 PI for sale.
It's a DP-100 Digital Video Probe in mint condition. It works in TM500 or TM5000 frames. I don't have a P6454 or P6460 to go with it, but I see that QService currently has a P6460 available.
"The DP-100 Digital Video Probe provides an easy way to observe up to 10 digital data lines simultaneously ... Output can be displayed on a picture monitor, waveform monitor, vectorscope, or an oscilloscope" I'm open to offers on this as while it's apparently a bit rare, it probably also has limited application. Cheers Dave |
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Re: Need help with component value on TDS684A CRT driver board
Thank you for the information - that's kinda what I expected but I wanted to make sure. Thanks again.
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Mike --- In TekScopes@..., "picredburner" <picredburner@...> wrote:
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Clean or Replace Dodgy AC-GND-DC/CH1-Both-CH2 Switches?
I have seen this on a couple of different instruments lately so I think it might not be that uncommon. I am referring to the gray-levered three position slider switches on 2213's and 2235's (probabl quite a few others as well).
Sometimes when switching from GND to DC the display goes haywire and it correct itself if I tap on the switch. In another instance I get both channels on the display when switching to one or the other and it also corrects if I tap on the switch. They don't look very accessible for any kind of cleaning attempt and although it would not be hard to remove and replace them, it will require significant disassembly (and, oh dread -- removal of a lot of knobs!). Is this worth pursuing or is it, in most peoples opinion, better to just live with it since the scope generally still works well? Thanks for any input. |
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Re: Question on what to do with 4 pallets of scopes...
--- On Mon, 2/18/13, Chin Siang Lim wrote:
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Re: Basic Probe Question
W6CCD
I have three probes that came with the 475. The first one is a Tektronix
with what appears to be a 013-071 screw-on tip. The ring of the probe handle shows 10003A, 600V Max, Atten 10X, 10 Megohm, 10 PF. The second one has a number P6053B and a little push-button near the word "Ident." The scope end has a little box on the BNC connector with 10Meg, 12.5pF, 6ft. Also Tektronix. The third one shows Hitachi Denshi Ltd. AT-10AK. There is a trimmer capacitor accessible through a little hole in the connector body. There is also a slide switch on the probe body for X1 and X10. I also have a direct probe that is just a coax with a BNC on one end, and two, clip-on leads on the other end. Do I need anything else for general testing, calibration and trouble-shooting of tube-type amateur radio transceivers? I will stay away from the 800 VDC in the tank circuit. The highest voltage I would see then would be <300 VDC. Richard (Dick) W6CCD --- In TekScopes@..., "Richard" <w6ccd@...> wrote: measure RF frequencies in a ham transceiver that could be as high as 800 VDC, and up to 30 Mhz. My question has to do with the proper type of probe. Is anything special needed to measure RF frequencies that could be generating significant power other than a common probe? Does the scope need protection from high power RF? I want to at least see what is going into the grids of the final amplifier tubes. -----Original Message----- From: TekScopes@... [mailto:TekScopes@...] On Behalf Of johncharlesgord Sent: Monday, February 18, 2013 12:42 AM To: TekScopes@... Subject: [TekScopes] Re: Basic Probe Question Richard, The Tektronix P6009 probe is rated up to 2.1kV peak (1.5kV rms, 4.2kV p-p), but not at full frequency. It is derated to 1000V peak in the 3MHz to 6MHz range, and 200V peak at 30MHz. These ratings are from the Tek website. The case of DC plus superimposed AC is not covered explicitly. There have recently been a number of imported high voltage, high frequency probes on eBay, one I saw was rated 4kV (DC+peak AC) and 100MHz bandwidth ($49.99), but I assume it cannot handle that high an AC voltage at the full 100MHz. --John Gord |
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Tektronix CSA series
Hello, I tried to seach info about tektronix
CSA series on Google, but found few. They seem to be somewhat similar to 11k series mainframes, I'd like to know more about them, I'm curious to know what are their limits and strong features. Can they be used as general purpose sampling scopes (fast transients for exmaple)? Can be used for TDR applications? What are common plugins that can be found around. Can be repaired, or are a nightmare of unobtanium parts? Thanks, Fabio. |
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Re: What is this item
Albert
The same number P6022 has been used for a voltage probe. Mentioned for instance in the passive voltage probe overview at Bill & Stan's Tektronix Resource Site.
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Albert --- In TekScopes@..., larrys@... wrote:
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Re: Tektronix 2465 capacitors etc.
Chris
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The problem could be in the 87V regulator Or Their could be a short/low Resistance some where in the load I have a 2465B open and I measured a load resistance of 25.3K to ground on Pin 7 of J121 (87V, the blue wire) with the power supply unplugged from the unit John -----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Chris Sent: Sunday, February 17, 2013 5:40 PM To: TekScopes@... Subject: [TekScopes] Re: Tektronix 2465 capacitors etc. All voltages measured in the scope with everything hooked up. I just got done checking the voltages pre-regulator. At J233A I get: pin 5 (87v unregulated) 97.6v Pin 3 (42v unregulated) 49.0v And at J234A I get: pin 5 (15v unregulated) 18.94v Pin 4 (5v unregulated) 6.64 Pin 2 (-5v unregulated) -6.92v Pin 1 (-15v unregulated) -18.54v Based on the unregulated values, I believe the issue must lie in the regulator portions, and since I'm getting the 97.6v pre-regulated it would seem to me the voltage doubler is working. I also double checked and verified the 10v reference voltage at the test point on the main board as well as the J121 connector that feeds the main board. (I figured this was important to double check as the regulators all are based off the 10v reference as I read it). Of course this is where I wish to learn more - I understand what the individual components do but I still somewhat struggle to see what the assembly as a whole is doing, which is why I'm trying to get into all this, so maybe my understanding is skewed. :) At any rate, it would seem to me that with the unregulated voltages where they're at, that the issue would have to lie within the follow area: Yes? No? I mean I have the correct voltages on the left side of those three groups, and the wrong voltages on the right side, so it would seem that's where I should look next? Thanks for helping this newb out! Chris --- In TekScopes@..., "Tom Miller" <tmiller11147@...> wrote: at the three 10 uF caps and all the diodes in that area. Be sure to only use fast diodes for any replacements. can come from the factory new. Did you measure all these voltages in the scope or on an external load?
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Re: Need help with component value on TDS684A CRT driver board
Hi,
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ehm, before I wrote r296 but I meant r294.... Giampi --- In TekScopes@..., "miketakeguess" <miketakeguess@...> wrote:
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Re: Need help with component value on TDS684A CRT driver board
Hi,
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yes, r296 connected to the cathode of cr196, is 2.7K 1/4W 5% Giampi --- In TekScopes@..., "miketakeguess" <miketakeguess@...> wrote:
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Re: Basic Probe Question
Richard,
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The Tektronix P6009 probe is rated up to 2.1kV peak (1.5kV rms, 4.2kV p-p), but not at full frequency. It is derated to 1000V peak in the 3MHz to 6MHz range, and 200V peak at 30MHz. These ratings are from the Tek website. The case of DC plus superimposed AC is not covered explicitly. There have recently been a number of imported high voltage, high frequency probes on eBay, one I saw was rated 4kV (DC+peak AC) and 100MHz bandwidth ($49.99), but I assume it cannot handle that high an AC voltage at the full 100MHz. --John Gord --- In TekScopes@..., "Richard" <w6ccd@...> wrote:
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David C. Partridge