Yes, it's always interesting to see how other people arrange and manage their workspace. I'm quite envious of the overall room size some of you guys have, but I'm not so keen on the way some of you manage the space you have. There seems to be a common pattern of cramming in as much test gear and tools and parts as possible at the expense of the space left to do useful work. We are all different in the way we work, but I really couldn't live with some of your work spaces because of the way they are set up. Lots of test gear stacked really high and wide with little work bench space left. Some of the benches are really shallow because of this, yet you had much more room area than me to start with.
?
Presumably some of you also have GPIB or LAN cables routed at the rear. I regularly need access to the various I/O signal ports at the rear of my test gear so that's another reason I couldn't live with the integrated setups shown here. To me, they look more like shop windows with the merchandise stacked high and wide. Maybe an octopus with long tentacles could reach it all without moving :)
?
Many years of working in a busy RF lab surrounded by other engineers has forced me to adopt a different approach both at work and here at home. Space is always at a premium at work and the best solution is to try and keep the main workbench as clutter free as possible. For me, having lots of available bench space is really important. I only have a small work room at home but I've managed to fit three decent benches into it and these offer lots of space to do work. Nearly all my test gear and tools and components are stored away like sardines in a storeroom leaving the workbenches as clear as possible. This makes for a very versatile work area. It's rare for me to not have enough free bench space even though the work room is quite small. I try and fetch and return test gear as required and this is how it is done at work too. Some items do remain on the bench all the time but they are all up at one end of the room. These are typically 19" boat anchor items like old analysers and sig gens.?
That's how things are done at work too. If I put all my test gear and tools and parts in the workroom I'd end up with no space left for me! I think the human factors are much more important than having every item of test gear stacked 6 or 7 high for maybe 10 feet or more. I think it's reasonable to declare oneself as the most important thing in the workroom, so I make sure I own and use as much of the workspace as possible and the space is not owned 24/7 by the test gear and tools etc.
?
However, I guess it's harder to make a huge mess if there's only a limited amount of remaining bench space to start with... I have to do regular tidy-ups to stop all three benches becoming cluttered with cables and miscellaneous RF 'stuff'. So I probably have to tidy up more often because of this. But having a large and versatile work area on the bench is important for me. So I have to try and stop it getting too messy. I have to accept this and I don't think there's an ideal solution to any of this.
I'm curious how some of you manage the off/standby status for your 'wall' of test gear if it is all built into racks or shelves? Once the room is powered up, does it all run in standby or do you have a system that lets you turn some items fully off when you are working with just a few pieces of test gear? To save on standby power when I'm working at the bench, I try and turn off as much of my unused bench gear as possible at the rear rocker switch if it has one. Due to limited access, only a couple of sig gens and a VNA are left in standby all the time that the workroom is powered up. I do turn everything off when the room is not in use, but I also try and minimise how much of it sits idly in standby when the bench is powered up. The fact that most of it is sat in storage helps a lot here.?
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Here's a shot of my home lab, complete with lots of HP goodness....
?
&3,
Bob Weiss N2IXK
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Hi Larry, ? Modest but very well-organized lab. My tools are not so well organized, maybe I should take an example from you. I admit that sometimes, it's total chaos in my lab. ? The choice of your equipment is varied and offers a lot of possibilities. You have HEATHKIT equipment, it reminds me my uncle had bought some HEATHKIT equipment, and it was me who repaired them... I liked it when he came to see me for that... memory. ? Yves ? This has morphed into an interesting thread! Here is my modest shop, built into the sliding-door closet of my home office. Close the door and it is out of sight. I see lots of familiar HP and Tek equipment in others' photos. Sent via the Samsung Galaxy S10
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-------- Original message --------Date: 9/18/24 3:40 PM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] Introduction Great to see others' labs! Here are my two labs -- the first (my main lab) is in my garage here in Silicon Valley.? Besides what you see, there's a whole bunch of "gee, maybe I could use that in a project," or "that'd be fun to get working," stuff filling every available surface, picked up at various swap-meets and the local surplus stores (now sadly vanished) over the years.? I'm about to hit 70 and have realized that I'll never use a lot of it in the time remaining -- tempus fidgits, after all.? And so I've been carting it off to the local swap-meet to sell. The second image is my more recently assembled home-away-from-home lab, again, in a corner of that house's garage.? ?(On the bench is an HP 3430A Nixie-tube DVM that I'm working on).??
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Yeah, Larry, my wife would love the "close the door and it's out of sight" aspect!? Great use of limited space.? You don't happen to be in Southern California, too, do you?
Yves, you are blessed to have even a narrow space, all that great gear, and the passion and time to use it.
Thanks for sharing, guys!? ? Jim Ford?
On Wed, Sep 18, 2024 at 4:47 PM, Yves Tardif <yves_tardif@...> wrote: Jim, ? My lab is 16 feet deep by 8? feet wide. The problem is more the width. And there is indeed a lot of equipment, I just counted them, I have 76 HP/Agilent/Keysigh equipment, and 14 Tek/B&K/R&S/Krohn-Hite/Huntron. I had never counted all that, that's for sure, I'm crazy. ? But all this equipment has been used for my work, I was self-employed for 27 years as a sr. RF & Analog Designer and before that, 22 years for a cable company. When the company decided to close, they made me an offer to sell me a lot of equipment at a ridiculously low price. I decided to accept and take advantage of this opportunity to try my luck as a self-employed person, and it was a very good decision. I was able to work on extremely diverse and very enriching projects. ? In short, in 2023 I had decided to retire, and finally in 2024 I accepted a one-day-a-week job in instrumentation, the same job when I started my career. I wanted to become a Geologist (Exploration Geology), but finally chance would have it that I worked in the field of electrical engineering. ? A lab is never big enough for passionate people, so we take up all the space we can ? ? Yves ? ? Wow, I'm impressed, Yves!? You certainly have a lot of space, and a lot of gear to fill it up!? ? ?Jim Ford? ? On Wed, Sep 18, 2024 at 2:16 PM, Yves Tardif Hi Jim, ? Here is my lab when it is not too messy. I have another section containing about ten instruments near my work desk. Small space, but enough to have fun. ? 
 ?
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 
? ? ? ? I'd love to see other benches! On another forum I've seen some "benches" that were to die for personal warehouses of wonderfully organized storage and spacious workbenches. Some of the minimalist benches were exceedingly clever uses of small spaces and very inspirational too.
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Re: HP-IB connector screws
OK, so you're Ian, but your "handle" on this group is unpronounceable.? Why is that?? ? A curious Jim Ford, Laguna Hills, California, USA?
On Wed, Sep 18, 2024 at 4:31 PM, dbztuzujdhgtrjzthxh via groups.io <dbztuzujdhgtrjzthxh@...> wrote: Hi Joel, as above, these nuts are available in Metric and Imperial.?
Fortunatly HP (might have been industry standard) made it easy to tell apart: ? Black = Metric ? Silver = Imperial
Taken from the 5334 manual
73 ian
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Jim, ? My lab is 16 feet deep by 8? feet wide. The problem is more the width. And there is indeed a lot of equipment, I just counted them, I have 76 HP/Agilent/Keysigh equipment, and 14 Tek/B&K/R&S/Krohn-Hite/Huntron. I had never counted all that, that's for sure, I'm crazy. ? But all this equipment has been used for my work, I was self-employed for 27 years as a sr. RF & Analog Designer and before that, 22 years for a cable company. When the company decided to close, they made me an offer to sell me a lot of equipment at a ridiculously low price. I decided to accept and take advantage of this opportunity to try my luck as a self-employed person, and it was a very good decision. I was able to work on extremely diverse and very enriching projects. ? In short, in 2023 I had decided to retire, and finally in 2024 I accepted a one-day-a-week job in instrumentation, the same job when I started my career. I wanted to become a Geologist (Exploration Geology), but finally chance would have it that I worked in the field of electrical engineering. ? A lab is never big enough for passionate people, so we take up all the space we can ? ? Yves ? ? Wow, I'm impressed, Yves!? You certainly have a lot of space, and a lot of gear to fill it up!? ? ?Jim Ford? ?
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On Wed, Sep 18, 2024 at 2:16 PM, Yves Tardif Hi Jim, ? Here is my lab when it is not too messy. I have another section containing about ten instruments near my work desk. Small space, but enough to have fun. ? 
 ?
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 
? ? ? ? I'd love to see other benches! On another forum I've seen some "benches" that were to die for personal warehouses of wonderfully organized storage and spacious workbenches. Some of the minimalist benches were exceedingly clever uses of small spaces and very inspirational too.
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This has morphed into an interesting thread! Here is my modest shop, built into the sliding-door closet of my home office. Close the door and it is out of sight. I see lots of familiar HP and Tek equipment in others' photos. 
Larry Sent via the Samsung Galaxy S10
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-------- Original message -------- From: Jeff Anderson <jca1955@...> Date: 9/18/24 3:40 PM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] Introduction
Great to see others' labs!
?
Here are my two labs -- the first (my main lab) is in my garage here in Silicon Valley.? Besides what you see, there's a whole bunch of "gee, maybe I could use that in a project," or "that'd be fun to get working," stuff filling every available surface, picked up at various swap-meets and the local surplus stores (now sadly vanished) over the years.? I'm about to hit 70 and have realized that I'll never use a lot of it in the time remaining -- tempus fidgits, after all.? And so I've been carting it off to the local swap-meet to sell.
?
?
The second image is my more recently assembled home-away-from-home lab, again, in a corner of that house's garage.? ?(On the bench is an HP 3430A Nixie-tube DVM that I'm working on).??
?
?
- Jeff, k6jca
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Re: HP-IB connector screws
Hi Joel, as above, these nuts are available in Metric and Imperial.?
Fortunatly HP (might have been industry standard) made it easy to tell apart: ? Black = Metric ? Silver = Imperial
Taken from the 5334 manual
73 ian
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Wow, I'm impressed, Yves!? You certainly have a lot of space, and a lot of gear to fill it up!? ? ?Jim Ford?
On Wed, Sep 18, 2024 at 2:16 PM, Yves Tardif <yves_tardif@...> wrote: Hi Jim, ? Here is my lab when it is not too messy. I have another section containing about ten instruments near my work desk. Small space, but enough to have fun. ? 
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 
? ? ? ? I'd love to see other benches! On another forum I've seen some "benches" that were to die for personal warehouses of wonderfully organized storage and spacious workbenches. Some of the minimalist benches were exceedingly clever uses of small spaces and very inspirational too.
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Hi Adri, ? I had borrowed a faulty 8595E from a friend to study the second converter. ? The problem with this 8595E was that the AMP CAL was not working and displayed an error message pointing to option 130 (narrow resolution bandwidth). Looking at the calibration constants, I noticed the calibration values ??were very far apart for some filters. After checking, I had no choice but to realign the filters. I followed the procedures and the problem was solved. This Spectrum had no hardware defects and option 130 had no problem. So, I did the full calibration, and voila, this 8595E now has a second life. ? Have you managed to get your 8595E working properly again? ? Before filters adjustments at left, and after at right. ? Yves ? 
? ? ? Yves, thanks for the info about the 2nd converter? After having installed the one bought on the bay?I checked?the original one?on the bench and it?seems to work normally I'm starting to suspect the blindness on the LOW BAND was due to a bad connection I did when the repair was suspended years ago ¡ ouch ! Meanwhile I'm investigating?a certain deafness on the HIGH BAND (from 2.4 to 11 dB) I measured the insertion loss of the SYTF I had realigned and found figures?from 5.2??to? 8.5 dB on the range? 3 to 6 GHz These figures?seem not too bad?and?the AMP CAL routine should be able to recover them ...unless there is some hardware problem in the generation of the tuning current (I performed the insertion loss measurements by manually tuning? with an external precision power supply)
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----- Messaggio originale ----- Inviato: 13/09/2024 07:51:28 Oggetto: Re: [HP-Agilent-Keysight-equipment] HP 5086-7906 YTO
Hi Adri, ? A friend of mine had a faulty 8595E, the problem comes from the option card 130. But I took the opportunity to look at the second converter, so here are some details on this module. ? Regards Yves ? ? hello Yves,
I received the 2nd converter and, after testing it on the bench (if you are interested I will give you the two test configurations) I installed it and voil¨¤, the machine is back to working like in the old days
It passes the amplitude and frequency calibrations and the confidence test without any problem
As it happened before the death of the YTO the analyzer still has a certain "deafness" after 5.5GHz
By virtue of the alignment of the spheres that I did a few weeks ago The defect is milder than it was then and I think it is due to a sub-optimal loss of insertion of the SYTF A3A2 As proof of the "deafness", while all the calibration routines, including the CAL YTF routine are performed without problems, the CAL MXR is not completed and gives the message CAL: HARMONICS INSUFFICIENT In fact I attach a screen of the 300MHz calibration signal from which it would seem that the very last harmonics are missing
Thank you in advance if can you send the analogous screen of your analyzer
In a few days I will receive a more reliable 6GHz RF generator than the current one and I will use it to try to perfect the alignment
Yves, I think that now you can reassemble and close your analyzer :-) Many thanks for all the measurements that you sent me and that were useful to trace the problem!
Adri ----- Messaggio originale ----- Inviato: 08/09/2024 01:35:49 Oggetto: Re: [HP-Agilent-Keysight-equipment] HP 5086-7906 YTO
Hi Adri ? Here are the measurements connected to the first 2 converters as a reference. ? For the second converter I get a voltage of -1.678V instead of -3.5V as written in the service manual, I would say that we have similar voltages for this particular point. It seems far from the nominal point, but there may be an error in the manual. ? You are close to the goal, and this module may be repairable if there is no micro circuit, I have never opened a second converter in this series, but it is a possibility. ? When you open your second converter, send me pictures, I'm curious. ? Yves ? dear Yves, I didn't realize that you had made the measurements expressly to help me! I owe you then a double (even triple) thanks! Especially considering the fact that the front end of this instrument is really very dense, complicated and delicate! After my last email, in addition to doing the (essentially mechanical) intervention on the SYTF, I continued to check the input signal through the various sections by alternately injecting 300MHz @-20dBm and 5GHz @0 dBm The signals were found to be in specification up to the A3A9 bandpass (where the two paths join to form the intermediate frequency of 321.4MHz). At this point I could see the 5GHz signal (converted), present at that point at -47dBm (the specification says -43/-56dBm).
Instead, no trace of the 300MHz input signal
Investigatine?the second converter A3A4 in more depth
I checked?the signals at its input
On J1 there is 3.9214GHz at -46dBm? --->OK
On J3 there is 321.4MHz @ -37.7dBm? --->OK
On J4 I did not check 600MHz @-1dBm but the fact that the converter works in band 1 tells me that the oscillator is present and is in specification
The power supply is quite OK (5V are actually 4.75; 10V are 9.98 and the DC that controls the internal switch that should be +15V? (band 0) and -3.5V?(band 1) is actually +14.60V and -1.35V
This last value is rather far from the nominal and would have worried me BUT band 1 is exactly the one that works Conclusion: it would seem that the culprit is the second converter and in particular (probably) the internal switch that has the sole task of letting the signal? (which is already at 321.4MHz and does not need to be converted)?pass from its input to the output
In the next few days I will test the converter that meanwhile?has been?disassembled?; In the meantime I found a cheap one on the bay that should arrive in about ten days
Yves, I have a question: on the block diagram A3A4 is represented as a block that has 5 ports of which one (J5) would seem to be the connector that carries the power and the DC that controls the switch and that connects to A7 Analog Interface through the W35 cable
Actually,?this connector on the real component, does not have a name
Instead,?the name J5?, stamped on the case , indicates an SMB connector that has the writing LO TEST and in my analyzer?it is the one that?conveys the 600MHz LO signal? Now,?on the block diagram the connector that conveys the 600MHz signal has the name J4 (in my analyzer, the J4 connector was disconnected) This confusion of names and roles made me doubt that years ago, when I had disassembled this section I had not reassembled it correctly thanks again and best regards ----- Messaggio originale ----- Inviato: 06/09/2024 23:21:52 Oggetto: Re: [HP-Agilent-Keysight-equipment] HP 5086-7906 YTO
Hi Adri, ? I had sent you the measurements of the RF input-output mixer signals verification, I had disassembled the High Frequency section of my 8595E to be able to provide you with this information. If you have no more questions relating to this section, I will close my 8595E and do a flatness check to see if everything is correct. ? Yves ? ? thank you very much for all the suggestions and information with which I will continue my investigation
In the meantime I received the 2.5mm socket wrench and after?a little mod to adapt it?for the purpose (photo), I proceeded to align the spheres of the SYTF
I must say that the operation done under the microscope is quite simple
The nuts must be loosened (not too much) and with a small screwdriver that acts as a delicate lever, ?the supports of?the?spheres can be moved so that the coupling ring completely shadows them (i.e. the sphere is exactly in the center)
Removing the gold mesh was not necessary
The insertion loss has improved enormously:
at 5 GHz it is -6dBm at 6GHz it is -10dB (before the signal starting from this frequency was no longer visible) at 6.5 GHz it is only -3dB
I will install it when I have solved the problem of "blindness" in band 0 since the calibration constants that the instrument has in memory (in practice the tuning current data) are relative to the original SYTF and the "new" SYTW requires a? SYTF CAL is done
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Hello, i would like to use HP Basic to program my HP8568B Spectrum analyzer. I have got the 7.1 version, but it ask for a serial number i don't have, i need also a manual and some hints to make it work with NI GPIB usb, Can some one give me some HINTS?
?
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Hi Jim, ? Here is my lab when it is not too messy. I have another section containing about ten instruments near my work desk. Small space, but enough to have fun. ? 
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 
? ? ? ? I'd love to see other benches! On another forum I've seen some "benches" that were to die for personal warehouses of wonderfully organized storage and spacious workbenches. Some of the minimalist benches were exceedingly clever uses of small spaces and very inspirational too.
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Re: HP-IB connector screws
Funny how these HPIB nuts are sometimes the only rusty thing on an otherwise pristine piece of HP gear?
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Great to see others' labs!
?
Here are my two labs -- the first (my main lab) is in my garage here in Silicon Valley.? Besides what you see, there's a whole bunch of "gee, maybe I could use that in a project," or "that'd be fun to get working," stuff filling every available surface, picked up at various swap-meets and the local surplus stores (now sadly vanished) over the years.? I'm about to hit 70 and have realized that I'll never use a lot of it in the time remaining -- tempus fidgits, after all.? And so I've been carting it off to the local swap-meet to sell.
?
?
The second image is my more recently assembled home-away-from-home lab, again, in a corner of that house's garage.? ?(On the bench is an HP 3430A Nixie-tube DVM that I'm working on).??
?
?
- Jeff, k6jca
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Re: KO4BB manuals site error
Several days ago I saw a post "somewhere" saying that the site had run out of disk space for manuals and that he would be working on it. I know disk space and a web link are not necessarily directly related but maybe that's why the Manuals page is not working.
Now same here in Italy.
The whole site works except the "Manuals"
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Re: HP 141T Power Supply Help Needed
Thanks for that feedback Dave.?
At this point in my struggle with this machine, nothing about it surprises me.? ?It could have been hit by lightning for all i know.? ? :-P?
One bit of good news, the modules do appear to be working.? I was able to view the scan and vertical outputs on my scope and it does look as i'd expect.??
Nice little mid week surprise for me there.??
I can't see what could destroy Q15, except perhaps C18 shorting.
Dave Wise
I don't have a HV probe currently, but its on my shopping list.? ? I'm going to go with 0v at the moment though, given the state of Q15.??
I guess I'm just wondering?if I should expect other damage to have occurred when this part failed.? ??
I will replace Q15 this week, get a probe and report back though!?
On Wed, Sep 18, 2024 at 10:59?AM Michael Bafaro via
<m.bafaro= [email protected]> wrote:
Bill,
?
Q15 is the FET that is in the HV regulator circuit.? The gate to the other leads will read open if the ohm meter is connected to back bias the junction.? The question is what voltage is present at the control
grid of the CRT?? If you have a high voltage probe you can measure it directly at the green lead on the PCB that goes to the CRT socket.? I measured -2580.? What voltage do you see??
?
Mike
?
?
Checking things out last night in the LV side of the HV supply, I saw on the edge of Q15 a small delamination. Very tough to see in that tight space but just enough to warrant further?investigation.? ?I pulled Q15 and a sizable chunk
was blown out and barely hanging on, so it's physically OPEN between pins 1 and 2.
I've ordered a replacement.? Anything else to be concerned with in this area in such a situation?? Q13 and 14 don't seem to be damaged as far as I can tell, at this time.? ??
?
On Tue, Sep 17, 2024 at 9:27?AM Bill Berzinskas via <bberzinskas=[email protected]> wrote:
Probably not related strictly to the PSU, so happy to make a new thread if needed.? ?
I've gone over the A5 board at a high level.? ?Checked all the test points and all but #7 appear to be as expected on the scope.
One of the schematics has voltages at the wiring pins, and those also look ok.? ?I have not checked per-node voltage within the circuit yet.? ??
Is this "fairly conclusive evidence" that A5 is generally OK?? ?I don't want to dwell on it, I'd thought that maybe Blanking or Pulse were having issues?
but now i'm thinking not.? ??
More power supply related, I don't see any oscillation on the HV oscillator.? ?The labelled 7v is closer to 12v so I'm thinking the problem is around Q13, 14 or 15.? Q15 looks kind?of not good, seeing .1v breakdown with a DMM diode test in-circuit.? ?I know
thats?not the best test, but it does seem to work for most of the other transistors I've tested.??
?
The worst bugs make the instrument diverge from the schematic, often in ways that would look like nonsense if you drew it there.
"From over 40 years of fault finding and repair experience in a wide range of electronic products, not just instrumentation,
the weirdest symptoms often have a really simple root cause!"
This has been my experience as well! Makes it very easy to go down a rabbit hole. Which is why I always do a thorough visual
inspection first. Also checking mechanical components of switches, pots, etc. Giving them a good clean right off the bat and testing those first can save you a lot of headache.
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Transferring waveforms from 54542a through GPIB
Hi,
?
I would like to transfer waveforms from my HP 54542A to a PC. In the past I have made do with floppy disks, but I find them to be unreliable and a bit of a faff. As a result I would like to use GPIB.
?
I have developed a working connection between my PC and the 54542A. It responds to *IDN? etc commands fine. However, the only means I have found of transferring data is a bit cumbersome and doesn't suit my workflow. I was wondering if someone knows if there is a better way to acquire data. I have read the manual to the best of my ability, but the programming guide is huge and a bit overwhelming for me on my first foray into this sort of work.
?
So far, I have been able to get a string of ASCII values by sending:
:WAVEFORM:SOURCE CHANNEL1 //We can only download one waveform at a time - I think?
:WAVEFORM:FORMAT ASCII? ? ?//To convert the output to ascii
:DIGITIZE CHAN1? ? ? ? ? ? ? ? ? ? ? //To actually put waveform data into some register to transfer
:WAVEFORM:DATA?? ? ? ? ? ? ? ? ? //Spits out waveform data - need scaling etc - looks like: 5208,5240,5272,5304,5336...
However, my workflow normally revolves around carefully retriggering the scope to capture certain events that are not captured during every trigger. I often find that after capturing a waveform, if I retrigger the scope, the signal of interest is no longer present. Therefore digitizing a channel (which seems to retrigger the scope) is very frustrating.?
?
In addition, it seems quite cumbersome to only be able to download a single channel, which then needs scaling to actual voltage values.
?
Is there any way to more conveniently transfer a set of waveforms that I have already captured - without the need to retrigger? Is there a way to output voltages directly - ideally similar to XY mode when saving to disk? Or have I been interpreting my outputs incorrectly?
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Re: 8566B Attenuator Service
On Wed, Sep 18, 2024 at 09:57 AM, Jinxie wrote:
Dimethyl mercury
yes... lot's of stuff kills you.
but... the biggest killer of all is time.
yet, we all use it.
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On Wed, Sep 18, 2024 at 01:23 PM, Roy J. Tellason, Sr. wrote:
It's been a long time since I've seen it, but I *think* that there's a bench underneath all of that "stuff" in the other room...
I think that once enough equipment accumulates that it hides other gear it breeds and, thus, new test equipment.? Sounds likely to me, anyway, but I'm having a tough time selling that explanation to the SO.
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Re: 8566B Attenuator Service
On Wed, Sep 18, 2024 at 10:01 AM, Jinxie wrote:
sure your hardness scale figures are correct
I'm just saying sandpaper scratches, and so 'cuts' glass.
smaller particles, are not harder, than larger ones... they just leave smaller scratches... so cut slower.
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Harold Foster