Jim,
In audio applications, when a huge filter cap is required, and not practical (usually due to cost), I use 2 smaller caps wired in parallel.
In your case, I would use 2 x 10,000uF 105¡ãC caps, properly rated for the actual voltage measured across the + and - terminals.
Regards
Menahem Yachad
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Re: 7603 Calibration Plug In Question
Why do you think "for the 7603"? Version -01 is called for in the 7603 calibration procedure. Version -02 is intended for the fastest scopes in the 7000 series including 7104. I don't know whether the faster rise time check function could cause some spurious ringing in the 7603.
Albert
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On Sun, Jul 22, 2018 at 10:07 AM, David Berlind wrote:
067-0587-02
On July 22, 2018 8:47:06 AM "Craig Sawyers" <c.sawyers@...>
wrote:
Tek scope noob question: Can the calibration plugin for the 7603 also be
used in some way for
calibrating other scopes too? Or just the 7603? Which calibration plugin?
Craig
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Re: 7603 Calibration Plug In Question
Thanks Adrian. What I was wondering was whether it could be externally connected in some way to another scope in order to calibrate that second scope. I suppose not based on the responses so far.
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On July 22, 2018 9:54:03 AM "Adrian" <Adrian@...> wrote: It will work with any 7000 series mainframe. This gives an outline and
there's a link to the manual:
Adrian
On 7/22/2018 9:06 AM, David Berlind wrote:
067-0587-02
On July 22, 2018 8:47:06 AM "Craig Sawyers"
<c.sawyers@...> wrote:
Tek scope noob question: Can the calibration plugin for the 7603
also be used in some way for
calibrating other scopes too? Or just the 7603? Which calibration plugin?
Craig
|
Re: 7603 Calibration Plug In Question
It will work with any 7000 series mainframe. This gives an outline and there's a link to the manual:
Adrian
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On 7/22/2018 9:06 AM, David Berlind wrote: 067-0587-02
On July 22, 2018 8:47:06 AM "Craig Sawyers" <c.sawyers@...> wrote:
Tek scope noob question: Can the calibration plugin for the 7603 also be used in some way for
calibrating other scopes too? Or just the 7603? Which calibration plugin?
Craig
|
Re: Tektronix DM5010 NiCa 2.4V battery replacement
From what I've read, you should never trickle charge Ni-Mh batteries. I just replaced the Ni-Mh batteries in two of a set of three cordless phones. The phones have a controlled charging system, and these battery packs were about 12 years old. They were used when I got them, and I've used them for more than 10 years, plus they were in storage for almost a year between users.
The machine tools is never shut down between uses. It is a commercial pipe bender, used by a local canopy manufacturer. The charge current was below C-1/40, yet the boards all failed in under a year.
Michael A. Terrell
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-----Original Message----- From: Tom Gardner <tggzzz@...>
Sent: Jul 22, 2018 3:40 AM
To: [email protected]
Subject: Re: [TekScopes] Tektronix DM5010 NiCa 2.4V battery replacement
My (limited) understanding is that NiMH cells really don't like more than C/20 -
and in many cases the definition of C is, um, very optimistic. I'd restrict
trickle charging to C/40 or C/50 - but that is finger in the wind.
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Re: 7603 Calibration Plug In Question
067-0587-02
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Show quoted text
On July 22, 2018 8:47:06 AM "Craig Sawyers" <c.sawyers@...> wrote: Tek scope noob question: Can the calibration plugin for the 7603 also be used in some way for
calibrating other scopes too? Or just the 7603? Which calibration plugin?
Craig
|
Re: 7603 Calibration Plug In Question
Tek scope noob question: Can the calibration plugin for the 7603 also be used in some way for
calibrating other scopes too? Or just the 7603? Which calibration plugin? Craig
|
7603 Calibration Plug In Question
Tek scope noob question: Can the calibration plugin for the 7603 also be used in some way for calibrating other scopes too? Or just the 7603?
|
Re: Tektronix DM5010 NiCa 2.4V battery replacement
My (limited) understanding is that NiMH cells really don't like more than C/20 - and in many cases the definition of C is, um, very optimistic. I'd restrict trickle charging to C/40 or C/50 - but that is finger in the wind.
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On 22/07/18 00:52, Michael A. Terrell wrote: I have a couple control panels from a machine tool where the design was for the Varta 3.6V 70mAh batteries that were common on computer motherboards. When they became NLA, the company started using NiMh batteries without a redesign. They leak in under a year, and badly damage the interface board. I just received some rechargable Li-ion batteries to try, when I repair the boards.
12-pcs-LIR2032-Li-ion-Button-Coin-3-6V-Rechargeable-Cell-Battery-w-Tab-US-Stock/
Michael A. Terrell
-----Original Message-----
From: Harvey White <madyn@...>
Sent: Jul 21, 2018 7:02 PM
To: [email protected]
Subject: Re: [TekScopes] Tektronix DM5010 NiCa 2.4V battery replacement
On Sat, 21 Jul 2018 18:36:42 -0400 (GMT-04:00), you wrote:
You can still buy Ni-Cad replacements for cordless phones, but I always extend the leads and mount them away from anything they can damage. You may have to buy a three cell package and remove one cell, but some are easily reworked and cheap. They are sold by many places, and on Ebay. Agreed. There are two cell packages (somewhere) as well. The main
problem with the NiCds is twofold. One is the amount of time between
use/charge and loss of calibration data. The second one, (of more
interest once you finally have the calibration equipment) is the
damage a leaking NiCd will cause. Hopefully, the Lithium primary
cells don't do that. IIRC, such cells were not included in the
design, although I do remember one in the AWG series.
Harvey
|
This inquiry is for the more knowledgeable folks on these scopes..
I have noted that there is a small red wire strung through the main harness from the switch pre amp to the trigger - Z axis board connected from a pad by the J338 coax connector and then on bottom of board to the S338B trigger view switch.
On the 466 w/o the DM44 and the 464 with DM44 it is connected to a pad just in front of Q682 this done on both the 670-3324-00 and 670-3324-01 boards with the 155-0032 chips and the 155-0217 chip on 464 w/DM44 this is listed as a replacement chip for the 0032. (any one know what the diff is for the two chips?) On the 465 with DM44 and board 670-2234-04 with the 155-0032 chip it is connected at a pad by resistor on lower edge of board in a resistor network unmarked about 1.5" in front of J688.
I am guessing that this wire is for the trigger view? I cannot find it on the schematics anywhere.
Jim O
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Re: The "other" Tektronix Mail List?
FWIW, there is a Tektronix list at Yahoo
called TekTronix_TECHs This seems to be mostly about Tektronix instruments other than scopes but may be of interest. The only other list I found when searching for them some time ago was a small private list of collectors.
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On 7/21/2018 11:23 PM, Raymond Cote wrote: I wasn¡¯t aware of another list!
You mean there other scopes besides the three number ones?
--
Richard Knoppow
dickburk@...
WB6KBL
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BTW, I did try a 7A22, a 7A26, and a 7B85 in the plug-in slots last night. Readout was a bit
grainy, and it
was impossible to get a stable trigger on the calibration squarewave except at the highest
amplitude, a
few volts. Since the 7B80/85 use +5V it is not surprising that they don't work properly if your 5V is screwy. Craig
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Re: The "other" Tektronix Mail List?
I wasn¡¯t aware of another list!
You mean there other scopes besides the three number ones?
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On Jul 22, 2018, at 01:21, Craig Sawyers <c.sawyers@...> wrote: (I have a 547, a 545, and a 360 Indicator with 160 Power Supply.) This is absolutely the right list for those! Lots of people here collect and restore gear of that
vintage.
Craig
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Re: The "other" Tektronix Mail List?
(I have a 547, a 545, and a 360 Indicator with 160 Power Supply.) This is absolutely the right list for those! Lots of people here collect and restore gear of that vintage. Craig
|
Yep, a 3300 uF cap jumpered across C821 smoothed out the voltage fairly
nicely. The 18,000 uF C821 is toast! I have a feeling removing it is
going to be a two-person job.
Next order of business: there are dozens of 18,000 uF caps with voltage
ratings between 16 V and 100 V listed at Digi-Key and Mouser. Should I
just go with Nichicon or United Chemicon and look for the longest life
one at 105 degrees C without breaking the bank? After all, I did see
one for >$100! Most seem to be $4-6 apiece. Size does not seem to be a
problem, as any modern cap is much smaller than the monster that is in
there; it's about the size of 2 D-cell batteries end to end.
BTW, I did try a 7A22, a 7A26, and a 7B85 in the plug-in slots last
night. Readout was a bit grainy, and it was impossible to get a stable
trigger on the calibration squarewave except at the highest amplitude, a
few volts. Just to be sure, I moved those plug-ins to my trusty 7904,
and triggering was possible down to very low amplitudes. Also, there
was a vertical line at the center bottom of the screen that didn't go
away, AFAIK under any circumstances; I guess we'll cross that bridge
when we come to it. It doesn't seem like replacing C821 will fix that.
Thanks for your help.
Jim
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------ Original Message ------ From: "Dave Hills" <dadhills@...> To: [email protected]Sent: 7/21/2018 9:44:06 AM Subject: Re: [TekScopes] Dead 7603
So I checked out the 8 V supply feeding the 5 V supply - it looks
really
bad! Similar waveform to the 5 V rail but dips from a high of maybe
14
V down to about 2 V. That's at the junction of the cathodes of
rectifiers CR820 and C821, C821, R821, and the collectors of Q829 and
Q835 on the Rectifier Board. If either of the rectifiers were shorted, you would see the waveform go
negative across C821. The minimum value of 2v indicates they are OK.
Then I checked at the anodes of CR820 and CR821; more convenient to
look
across C820. I saw about a 30 Vp-p near-sinewave there, with the
anode
of CR820 180 degrees out of phase with the anode of CR821.
This is OK.
I tried to measure C821 (18,000 uF) in-circuit with my cheapo Chinese
transistor/resistor/diode/capacitor checker, but it couldn't get a
reading. Ditto for C820 (0.1 uF, 100 V). I assume the transformer
effectively presents a short and throws off the checker.
This is what I would expect. Don't expect in-circuit measurements to
be meaningful with respect to a single component in a network. The
measuring instrument can't sort out a single component, as it see's
everything connected to it and makes a futile attempt to make sense of
the measurement.
Also, R821, from the cap/diode cathodes/transistor collectors point to
GND, reads 5.5k ohms, when it's supposed to be 4.7k +/-10%. I was
surprised to see it read high; most times the sneak paths make
resistors
read low in-circuit. Not that 5.5k probably makes a difference.
Either due to residual charge on C821, or R821 has drifted high, which
is not unusual if it is an aged carbon composition resistor.
Anyway, should I suspect the cap C821 or one of the diodes CR820 or
CR821? Or something else altogether?
All the info you have provided points to an open C821. Easy to confirm
by tacking an additional electrolytic cap across it and looking at the
waveform again. Even a small value, say, 100uF should make a
measurable difference. If the lowest level, 2v, increases, then you
have confirmed it is likely bad.
Dave
--- This email has been checked for viruses by AVG.
|
Re: The "other" Tektronix Mail List?
Pretty sure this is the only one.? ? ?I have a 545, a 575, a 7854? ?(and a Telequipment D51 and some HP scopes) and this is definitely the place to discuss those old tube behemoths.
? Dan
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On Saturday, July 21, 2018, 9:13:05 PM EDT, Roy Morgan <k1lky68@...> wrote:
Is there a mail list oriented to the older ¡°Classic¡± Tek equipment?
(I have a 547, a 545, and a 360 Indicator with 160 Power Supply.)
Roy
Roy Morgan
k1lky68@... <mailto:k1lky68@...>
|
Re: OT: HP70843B 12 GHz BERT info needed
There are some pictures of the guts at:
Folder name: HP70843B 12 Gbps BERT
More to follow
Ed
|
The "other" Tektronix Mail List?
Is there a mail list oriented to the older ¡°Classic¡± Tek equipment?
(I have a 547, a 545, and a 360 Indicator with 160 Power Supply.)
Roy
Roy Morgan
k1lky68@... <mailto:k1lky68@...>
|
If by "intensified beam" you mean the mode where the "selected" portion of the delaying sweep is brightened, then yes, there is. The problem is that I am only seeing the brightened part but not the rest of the sweep (unless I turn the intensity to dangerous levels, then I can see it very very faintly).
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Re: Tektronix DM5010 NiCa 2.4V battery replacement
I have a couple control panels from a machine tool where the design was for the Varta 3.6V 70mAh batteries that were common on computer motherboards. When they became NLA, the company started using NiMh batteries without a redesign. They leak in under a year, and badly damage the interface board. I just received some rechargable Li-ion batteries to try, when I repair the boards.
12-pcs-LIR2032-Li-ion-Button-Coin-3-6V-Rechargeable-Cell-Battery-w-Tab-US-Stock/
Michael A. Terrell
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-----Original Message----- From: Harvey White <madyn@...>
Sent: Jul 21, 2018 7:02 PM
To: [email protected]
Subject: Re: [TekScopes] Tektronix DM5010 NiCa 2.4V battery replacement
On Sat, 21 Jul 2018 18:36:42 -0400 (GMT-04:00), you wrote:
You can still buy Ni-Cad replacements for cordless phones, but I always extend the leads and mount them away from anything they can damage. You may have to buy a three cell package and remove one cell, but some are easily reworked and cheap. They are sold by many places, and on Ebay. Agreed. There are two cell packages (somewhere) as well. The main
problem with the NiCds is twofold. One is the amount of time between
use/charge and loss of calibration data. The second one, (of more
interest once you finally have the calibration equipment) is the
damage a leaking NiCd will cause. Hopefully, the Lithium primary
cells don't do that. IIRC, such cells were not included in the
design, although I do remember one in the AWG series.
Harvey
|
Michael A. Terrell
Raymond Cote
Tomas Alori