The function(s) listed below. Some instruments have multiple functions - for example, the 4195A is a VNA, spectrum analyzer and an impedance analyzer. Therefore the 4195A is listed in multiple categories
I was only making an assumption that it is the BR/CR2430. Can you use a caliper to measure the diameter at least to see if it is in the 24mm range? For the height is not so important since you have enough space and it will fit in the holder.
I just came from work, I wanted to reply much earlier to get the BR version instead of the CR one.
I attached a PDF with the differences between the BR and CR chemistries and usage types.
All HP/Agilent equipment that I replaced batteries in had a BR model inside.
On 28/02/2025 21:46, Radu Bogdan Dicher via groups.io wrote:
Harvey and all, I guess you're right, once the unit is unplugged there shouldn't be a path to short the battery and lose the existing memory (though I haven't done this, so I'm not aware of all the practical implications). I currently have an order for some CR2430 batteries - went with Razvan's call on that one (and Razvan, no worries, I can return them if not the correct part) - and PCB mount holders for them. Sure, the more common CR2032 would probably work just fine, but I always prefer to repair something as close as I can to its original configuration. I'm not sure how likely it is that a random 2430 holder will fit on the PCB, but if worst comes to worst, I can either return both, or work out something with a bit of wire. I'll seek to measure the existing battery once I have the board out and therefore access and before removing the current battery, but my working hypothesis is they're depleted. Radu.
On Fri, Feb 28, 2025 at 12:17?PM Harvey White via groups.io < groups.io> <madyn@... <mailto:[email protected]>> wrote:
Correct.? What is likely being done is to replace the battery while the equipment is line powered.
If the battery is dead, then obviously, no problem.
What a safer approach (to me) would be is to supply a backup voltage to the circuit, device unplugged, then cut the battery loose.? Then desolder and replace, then remove the supply.
I'm not sure that interrupting the ground is wise.? If you do go with an isolation transformer, then that one meg resistor from the iron ground to chassis ground is a good idea.
I wonder if there's a battery holder that would be soldered into the board with the same spacing?
Harvey
On 2/28/2025 11:15 AM, Radu Bogdan Dicher via groups.io < groups.io> wrote: > Harvey - correct me if I'm wrong, but I think the issue is supplying > the 3V while working on the battery (soldering with a grounded iron) > from an external power supply so the memory would be preserved. > What I'd probably do is run the soldering?station off of an isolated > power supply (mine is a BK 1655) with an interrupted ground. I'm not > entirely sure on ESD protection, but if I'd do this while supplying > the 3V off of an external power supply, that'd probably do OK handling > that part. > Radu. > > On Fri, Feb 28, 2025 at 7:33?AM Harvey White via groups.io <> > < <>> <madyn@... <mailto:[email protected]>> wrote: > >? ? ?You could, of course, simply unplug the meter you're working on, >? ? ?so it's >? ? ?isolated? > >? ? ?Rubber mat if needed. > >? ? ?Harvey > > >? ? ?On 2/28/2025 4:16 AM, Leo Kroonenburg via groups.io < groups.io> >? ? ?< <>> wrote: >? ? ?> I modified my soldering station lije this: >? ? ?> Instead using the hard ground wire to the tip I replaced it with >? ? ?a 1 >? ? ?> MOhm resistor inside the soldering station. >? ? ?> No more risk of shorting stuff, and still a 0V potential in the tip. >? ? ?> Works for me. >? ? ?> Leo >? ? ?> > > > > > > >
Looking at the service manual for the Canon MS-8000 reveals the following
?
Photosensitive element?
1) Type: CMOS CIS (image sensor
2) Density of element: 300 dpi
3) Effective elements: 3488 (effective reading length 295.3mm)? (this calculates out at 300dpi)
?
Output resolution
1} Standard: 300 x 300 dpi
2) Fine: 600 x 600 dpi
3) High speed: 200 x 200 dpi
?
So I guess that the native resolution is 300 x 300 dpi and there must be some sort of interpolation for the 600 x 600 scans
?
I will rescan a couple of representative pages at 300 x 300 dpi, 256 level gray scale? for members to take a look at.
Hopefully this will close out the topic of finding the best resolution / bit depth / post processing to use when getting scans from the archive to people
On Thu, Feb 27, 2025 at 4:08?PM Don Bitters via <donbitters=[email protected]> wrote:
Radu,
I have no personal knowledge of the this battery replacement, however my best guess would be a CR2032, or CR2025 type. The coin/button cells of this type seem to be 3V lithium. If you cannot lift the outer tang assembly vs. the inner recessed oval then it is one piece and tack welded to the battery “-“ terminal. The other side of the battery that you cannot see is held to the spring contact on the board by the spring tension of the neg assembly tang.? You can peel the negative tang off the battery, but that generally eliminates the spring tension of the negative terminal.? You would have to recreate that tension and install a new battery.?
This vendor has quite a few button batteries of all sizes and several with pre-mounted tangs that have been tack welded on.
Don Bitters
?
Re: HP 8660B/86602B developed output stability problem, getting-started suggestion(s) request
I guess you're right, once the unit is unplugged there shouldn't be a path to short the battery and lose the existing memory (though I haven't done this, so I'm not aware of all the practical implications).?
I currently have an order for some CR2430 batteries - went with Razvan's call on that one (and Razvan, no worries, I can return them if not the correct part) - and PCB mount holders for them. Sure, the more common CR2032 would probably work just fine, but I always prefer to repair something as close as I can to its original configuration. I'm not sure how likely it is that a random 2430 holder will fit on the PCB, but if worst comes to worst, I can either return both, or work out something with a bit of wire.?
I'll seek to measure the existing battery once I have the board out and therefore access and before removing the current battery, but my working hypothesis is they're depleted.
On Fri, Feb 28, 2025 at 12:17?PM Harvey White via <madyn=[email protected]> wrote:
Correct.? What is likely being done is to replace the battery while the
equipment is line powered.
If the battery is dead, then obviously, no problem.
What a safer approach (to me) would be is to supply a backup voltage to
the circuit, device unplugged, then cut the battery loose.? Then
desolder and replace, then remove the supply.
I'm not sure that interrupting the ground is wise.? If you do go with an
isolation transformer, then that one meg resistor from the iron ground
to chassis ground is a good idea.
I wonder if there's a battery holder that would be soldered into the
board with the same spacing?
Harvey
On 2/28/2025 11:15 AM, Radu Bogdan Dicher via wrote:
> Harvey - correct me if I'm wrong, but I think the issue is supplying
> the 3V while working on the battery (soldering with a grounded iron)
> from an external power supply so the memory would be preserved.
> What I'd probably do is run the soldering?station off of an isolated
> power supply (mine is a BK 1655) with an interrupted ground. I'm not
> entirely sure on ESD protection, but if I'd do this while supplying
> the 3V off of an external power supply, that'd probably do OK handling
> that part.
> Radu.
>
> On Fri, Feb 28, 2025 at 7:33?AM Harvey White via
> <> <madyn=[email protected]> wrote:
>
>? ? ?You could, of course, simply unplug the meter you're working on,
>? ? ?so it's
>? ? ?isolated?
>
>? ? ?Rubber mat if needed.
>
>? ? ?Harvey
>
>
>? ? ?On 2/28/2025 4:16 AM, Leo Kroonenburg via
>? ? ?<> wrote:
>? ? ?> I modified my soldering station lije this:
>? ? ?> Instead using the hard ground wire to the tip I replaced it with
>? ? ?a 1
>? ? ?> MOhm resistor inside the soldering station.
>? ? ?> No more risk of shorting stuff, and still a 0V potential in the tip.
>? ? ?> Works for me.
>? ? ?> Leo
>? ? ?>
>
>
>
>
>
>
>
Correct.? What is likely being done is to replace the battery while the equipment is line powered.
If the battery is dead, then obviously, no problem.
What a safer approach (to me) would be is to supply a backup voltage to the circuit, device unplugged, then cut the battery loose.? Then desolder and replace, then remove the supply.
I'm not sure that interrupting the ground is wise.? If you do go with an isolation transformer, then that one meg resistor from the iron ground to chassis ground is a good idea.
I wonder if there's a battery holder that would be soldered into the board with the same spacing?
On 2/28/2025 11:15 AM, Radu Bogdan Dicher via groups.io wrote:
Harvey - correct me if I'm wrong, but I think the issue is supplying the 3V while working on the battery (soldering with a grounded iron) from an external power supply so the memory would be preserved. What I'd probably do is run the soldering?station off of an isolated power supply (mine is a BK 1655) with an interrupted ground. I'm not entirely sure on ESD protection, but if I'd do this while supplying the 3V off of an external power supply, that'd probably do OK handling that part. Radu.
On Fri, Feb 28, 2025 at 7:33?AM Harvey White via groups.io <> <madyn@...> wrote:
You could, of course, simply unplug the meter you're working on, so it's isolated?
Rubber mat if needed.
Harvey
On 2/28/2025 4:16 AM, Leo Kroonenburg via groups.io <> wrote: > I modified my soldering station lije this: > Instead using the hard ground wire to the tip I replaced it with a 1 > MOhm resistor inside the soldering station. > No more risk of shorting stuff, and still a 0V potential in the tip. > Works for me. > Leo >
Re: HP 8660B/86602B developed output stability problem, getting-started suggestion(s) request
I once tried adjusting one of the oscillators on the 8660 on an extender. Once it was placed back in the slot with the cover on, it would not lock. I had to go back and re-adjust the oscillator in the slot with the cover on.
On 2/28/2025 6:26 AM, David Feldman via groups.io wrote:
Today is "no good deed goes unpunished"...
Yesterday assembled four 15-pin extender cards (had the PCBs made a long time ago, but never built the 15-pin versions til yesterday.)
Initial goal has been to carry out verification and attempted adjustment of SL1's synthesizer which appears to be the source of the wandering problem in the 20-30 MHz composite signal provided to the RF plug-in. The 8660B service manual section 5-33 (adjustments for SL1) specifies test points (A2TPxxx) that are on the motherboard's top side, and adjustments made via the bottom side (enclosed PCB area). The four test point signals are also accessible on PCBs A15 and A19 (bottom side), hence the extender board idea. Photo attached of the two boards on their (new) extenders.
(photo attached)
Restarted the synthesizer in this configuration (no smoke emerging), counter attached to the 20-30 MHz port of 11707A, the signal there is now stable (not wandering). Checked this across it's working range (settings xxx0000000 to xxx9999999 Hz) and the 11707A 20-30 MHz output frequency appears stable. No components have been replaced, and after the synthesizer started showing the wandering problem, the problem persisted until now.
At this point I'm going to put the A15 and A19 boards back into normal position and reattach their shield covers and see if the problem reappears.
In the scanning application, when you select either 16 level of 256 level gray scale, the software automatically
?
- locks you out of contrast adjustments, setting the value to midband
- sets the dither control to 'none' and locks you out of making changes
?
In this mode, the program only gives you access to a brightness slider and a DPI dropdown
?
This being said, I am wondering if the highest DPI setting that I am using (600 DPI) is not the maximum optical resolution but interpolated from a lower physical resolution
On Fri, 28 Feb 2025 at 17:45, Dave McGuire via <mcguire=[email protected]> wrote:
On 2/28/25 10:00, Peter Brown wrote:
> Any other takers for trying to post process the 256 level .tiff files?
> -? found at
> files - temporary directory for photographs and help relating to emails
> and posting/11707A Service PFX 1525A 11707-90007 SEP 1977 rev 1
> The files contain pages of just text, pages with text and images, and
> pages with circuit diagrams
> I'll leave them up for another couple of days and then remove as they
> are pretty big
Any other takers for trying to post process the 256 level .tiff files? -? found at files - temporary directory for photographs and help relating to emails and posting/11707A Service PFX 1525A 11707-90007 SEP 1977 rev 1 The files contain pages of just text, pages with text and images, and pages with circuit diagrams I'll leave them up for another couple of days and then remove as they are pretty big
OK. I just did a test with a SPAN from 30 KHz to 250 KHz and I have exactly the same problem. A11 do not seems to be the problem on this unit.?
?
30 KHz-250 KHz S11 response:
?
Here is two pictures of the output of my 8753ES. One at 1 GHz and one ar 3 GHz with the same parameters (CW mode, 0dBm output, Trigger HOLD, measured on a Spectrum with 1 MHz SPAN, same RBW). The result is not as clean as your measurement. What is your conclusion about it ?
?
1 GHz, 0 dBm, SPAN 0 mode, PORT 1 output: ?
?
?
3 GHz, 0 dBm, SPAN 0 mode, PORT 1 output: ?
Here is a measurement of the R chanel output, I have about -16 dBm of output power. ?Same as your measurement.
?
R output power verification at 1GHZ, SPAN 0 mode :
Yesterday assembled four 15-pin extender cards (had the PCBs made a long time ago, but never built the 15-pin versions til yesterday.)
Initial goal has been to carry out verification and attempted adjustment of SL1's synthesizer which appears to be the source of the wandering problem in the 20-30 MHz composite signal provided to the RF plug-in. The 8660B service manual section 5-33 (adjustments for SL1) specifies test points (A2TPxxx) that are on the motherboard's top side, and adjustments made via the bottom side (enclosed PCB area). The four test point signals are also accessible on PCBs A15 and A19 (bottom side), hence the extender board idea. Photo attached of the two boards on their (new) extenders.
(photo attached)
Restarted the synthesizer in this configuration (no smoke emerging), counter attached to the 20-30 MHz port of 11707A, the signal there is now stable (not wandering). Checked this across it's working range (settings xxx0000000 to xxx9999999 Hz) and the 11707A 20-30 MHz output frequency appears stable. No components have been replaced, and after the synthesizer started showing the wandering problem, the problem persisted until now.
At this point I'm going to put the A15 and A19 boards back into normal position and reattach their shield covers and see if the problem reappears.
Harvey - correct me if I'm wrong, but I think the issue is supplying the 3V while working on the battery (soldering with a grounded iron) from an external power supply so the memory would be preserved.?
What I'd probably do is run the soldering?station off of an isolated power supply (mine is a BK 1655) with an interrupted ground. I'm not entirely sure on ESD protection, but if I'd do this while supplying the 3V off of an external power supply, that'd probably do OK handling that part.?
On Fri, Feb 28, 2025 at 7:33?AM Harvey White via <madyn=[email protected]> wrote:
You could, of course, simply unplug the meter you're working on, so it's
isolated?
Rubber mat if needed.
Harvey
On 2/28/2025 4:16 AM, Leo Kroonenburg via wrote:
> I modified my soldering station lije this:
> Instead using the hard ground wire to the tip I replaced it with a 1
> MOhm resistor inside the soldering station.
> No more risk of shorting stuff, and still a 0V potential in the tip.
> Works for me.
> Leo
>
On 2/28/2025 4:16 AM, Leo Kroonenburg via groups.io wrote:
I modified my soldering station lije this: Instead using the hard ground wire to the tip I replaced it with a 1 MOhm resistor inside the soldering station. No more risk of shorting stuff, and still a 0V potential in the tip. Works for me. Leo
In the past, I tried some features of this software tools, but I did not go beyond a simple plot of graphs. I remember that you can define a virtual VNA, and perform a calibration starting from the measurements of the devices of a cal kit, and then apply the calibration to the raw measurements of the device under test . Good documentation and examples, Python language Regards? Maurizio IZ1MDJ ?
Networks
The central object in?skrf?is a N-port microwave??object. A??can be created in a number of ways, one way is from data stored in a touchstone file"
MattSNE
Dave McGuire
