Re: VISA problems with ancient test equipment?
? Hi Ernst, ? Using the 5350B series meters is not simple with GPIB at first glance. But you have to follow a small procedure: ? You must put the meter in HOLD mode to begin. ? - Press the SET key - Press the SAMPLE RATE button - With the LEFT arrow, move the cursor to the HOLD position on the left. - Go to Connection Expert (I used USB-GPIB interface 82357B). - In the menu on the left, choose the interface to which your 5350B is connected. - Choose ADD and GPIB INSTRUMENT - Choose the GPIB address corresponding to your 5350B (example GPIB0 and primary address 14) - Uncheck AUTO IDENTIFY - press on OK - The instrument should appear in the list with the name UNKNOW and the address GPIB0::14::INSTR for this example. - You will not be able to test with Connection Expert, however this will allow using a program to communicate if you add the following two VISA commands, allowing you to complete a reading with the LINEFEED character. In the example, these are two commands used in vb.net. ? errorStatus = visa32.viSetAttribute(vi5351B, VI_ATTR_TERMCHAR_EN, 1) errorStatus = visa32.viSetAttribute(vi5351B, VI_ATTR_TERMCHAR, 10) ? 
? ? If you use a GPIB interface from National Instruments, such as GPIB-USB-B or PCI-NI-GPIB for example, it will be possible to communicate with the instrument if you add the two options (Configure EOS): - Enable "Terminate READ on EOS" - EOS byte=10 ? 
? ? ? I wrote a small program to test the sensitivity of the 535xB meters a few weeks ago. I modified it to allow only 10 consecutive readings on input 1 or input 2 (terminated 50 Ohms). ? The image shows you the result of a 300 MHz -20dBm signal at input 2. ? If you can't test GPIB communication, I will send you this little program for you to try. ? Yves ? 
? ? Hello,
my HBIB system works with 8568B spectrum anaylyzer, 8970A, 34401A and others.
However I fail to connect a 5350B to my system. Diag 80 (HPIB diagnosis) shows no errors. Also tried ddifferent HPIB cables with no change.
The counter is not found with Keysight Connection Expert. I get an VISA BFFF0012 error when I try to connect within WinGPIO software.
Before digging into the hardware of the HPIB interface within the counter, I assume that VISA is not working with "old" test equipment, as I have same problem with 5343A counter.
Is there workaround? Any ideas are appreciated.
Regards Ernst
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Re: RED light diffusing tape used in HP instrument displays
What about rubylith tape (like we used to use to make PCB artwork)?
3M makes tape (which is pricey) but you can buy sheets for a few dollars.
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Re: HP 3852a extended memory modules info
I keep looking at my parts and seems the issue with the parts is naming by different vendors.? .Nexperia SO20 is 7.5mm wide while TI SO20 is 5.3mm wide.? Lesson learnt - cant trust the names - need to check dimensions.? TI SO20 is 5.3mm wide body  Nexperia SO20 is 7.5mm wide 
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Re: HP 3852a extended memory modules info
Here is the pad difference seen on? half of U1 shown with SO20W and other half with both SO20 and? SO20W. Routing is possible but a few tracks and vias had to be moved. SO20W and SO20 overlap. This is for illustration only. ? 
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VISA problems with ancient test equipment?
Hello,
my HBIB system works with 8568B spectrum anaylyzer, 8970A, 34401A and others.
However I fail to connect a 5350B to my system. Diag 80 (HPIB diagnosis) shows no errors. Also tried ddifferent HPIB cables with no change.
The counter is not found with Keysight Connection Expert. I get an VISA BFFF0012 error when I try to connect within WinGPIO software.
Before digging into the hardware of the HPIB interface within the counter, I assume that VISA is not working with "old" test equipment, as I have same problem with 5343A counter.
Is there workaround? Any ideas are appreciated.
Regards Ernst
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Re: looking for anritsu sitemaster s331a circuit diagram
There is a new one in groups.io for Japanese equipment. [email protected] | MessagesThe traffic is low, and requests for info have gone unanswered. Seems like most Japanese gear has little info available for repair and maintenance. Ed
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Re: HP 3852a extended memory modules info
Been there and done that.? At least you don't have two unrelated traces with the same name due to cut and paste.? Next design, then.
Harvey
toggle quoted message
Show quoted text
On 6/12/2024 1:20 PM, Maciej Kawalkowski wrote:
Just checked ..it's too late to change as they did the drilling and imaging the copper .
On Wed, Jun 12, 2024, 1:18?PM Maciek KawalkQCWski <kawalkowski.m@...> wrote:
The boat has sailed. I redesigned and submitted my boards
yesterday. I will see if I can stop production..
On Wed, Jun 12, 2024, 10:51?AM Harvey White via groups.io
<> <madyn@...> wrote:
I did that when I ordered a 24C256 in the wider package.? It
works well,
except that Eagle complains about overlaps.? Those become
forgivable
errors.? If that is objectionable, then put them on opposite
sides of
the board if convenient.
Harvey
On 6/12/2024 3:30 AM, Mike wrote:
>
> Perhaps make a dual footprint so either will fit, as long as
they have
> the same pin pitch!
>
>
> On Wed, 12 Jun 2024, 01:22 Maciej Kawalkowski via groups.io
<>
> <>, <kawalkowski.m@...> wrote:
>
>? ? ?Harvey
>? ? ?Since I ordered quite a large number of the 74AHCT245 i
think its
>? ? ?better to change the PCB design accordingly. Just more
wasted time
>? ? ?but no additional cost.
>? ? ?Maciej
>
>
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Re: HP 3852a extended memory modules info
Just checked ..it's too late to change as they did the drilling and imaging the copper .
The boat has sailed. I redesigned and submitted my boards yesterday. I will see if I can stop production..
I did that when I ordered a 24C256 in the wider package.? It works well,
except that Eagle complains about overlaps.? Those become forgivable
errors.? If that is objectionable, then put them on opposite sides of
the board if convenient.
Harvey
On 6/12/2024 3:30 AM, Mike wrote:
>
> Perhaps make a dual footprint so either will fit, as long as they have
> the same pin pitch!
>
>
> On Wed, 12 Jun 2024, 01:22 Maciej Kawalkowski via
> <>, <kawalkowski.m=[email protected]> wrote:
>
>? ? ?Harvey
>? ? ?Since I ordered quite a large number of the 74AHCT245 i think its
>? ? ?better to change the PCB design accordingly. Just more wasted time
>? ? ?but no additional cost.
>? ? ?Maciej
>
>
|
Re: HP 3852a extended memory modules info
The boat has sailed. I redesigned and submitted my boards yesterday. I will see if I can stop production..
I did that when I ordered a 24C256 in the wider package.? It works well,
except that Eagle complains about overlaps.? Those become forgivable
errors.? If that is objectionable, then put them on opposite sides of
the board if convenient.
Harvey
On 6/12/2024 3:30 AM, Mike wrote:
>
> Perhaps make a dual footprint so either will fit, as long as they have
> the same pin pitch!
>
>
> On Wed, 12 Jun 2024, 01:22 Maciej Kawalkowski via
> <>, <kawalkowski.m=[email protected]> wrote:
>
>? ? ?Harvey
>? ? ?Since I ordered quite a large number of the 74AHCT245 i think its
>? ? ?better to change the PCB design accordingly. Just more wasted time
>? ? ?but no additional cost.
>? ? ?Maciej
>
>
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Re: looking for anritsu sitemaster s331a circuit diagram
I wonder if anyone had ?success in obtaining a schematic for this unit. I recently picked up an S331A that shows integrator failure in self test. ??
EEV Blog has some repair guidance for this unit?
https://www.eevblog.com/forum/repair/anritsu-wilton-s331a-schematic-needed/
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Re: HP transistor 1853-0063 or alternative?
I took a quick look at the circuit, and I think the Q1 spot should have a medium-high Vcbo transistor, like 120-150V, for best reliability. I don't know what the original part was. Under normal conditions or partial overload, Q1 doesn't need to drop much, but with the +75V (or the "+77V") supply shorted to ground, the bottom of the raw supply (C1's can), hence Q1's collector, will need to go to whatever the raw voltage is, maybe -100V or more. Such an event could have caused the C-E short mentioned in the OP, if the part couldn't handle it. I'd find it hard to believe that HP would not have used a suitable part for Q1, that could take a common fault like this. That's also why Q1 and Q2 are different - if Q1 didn't need to be higher voltage, they could likely have been the same part type. Alternatively, you could just say so what if Q1 breaks down when +75V is shorted. If it's stout enough, it will take a momentary short, or perhaps blow the line fuse, and not be damaged. I'd rather have it act more civilly, and just recover when the fault is removed.
The parts list says Q1 is silicon. It looks like the normal load on the +75V is around 25 mA, so modest power then. It looks like the circuit including CR703 and CR704 provides some foldback limiting, but I think the maximum would be around 50 mA, so worst case power dissipation maybe 6W, which should be no sweat for a properly chassis-mounted TO-3.
I'd recommend looking for a TO-3 Si PNP with Vcbo or Vceo over 150V, and DC-SOA rating better than say 100 mA at 150V.? I vaguely recall there are some medium-high voltage TO-3 PNPs used in the HP141T, that may be suitable, and very common, but don't recall the number (-0140- or -0138- seem to pop into my brain, but maybe entirely wrong).
Like Dave W. mentioned, you'd probably want something fairly slow, but simple circuit mods can fix any instability if choices are limited. Also, it doesn't necessarily have to be TO-3, since it's fairly easy to fit T0-220 and others into the footprint. I'd recommend not using ones intended specifically for SMPS use, without first checking the hfe spec at low collector current - sometimes they're quite low, which could cause circuit problems.
BTW my assessments are based on a manual I found online: 03400-90013, 1 December 1986. Others may show different circuits and changes.
Ed
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Re: HP 3852a extended memory modules info
I did that when I ordered a 24C256 in the wider package.? It works well, except that Eagle complains about overlaps.? Those become forgivable errors.? If that is objectionable, then put them on opposite sides of the board if convenient.
Harvey
toggle quoted message
Show quoted text
On 6/12/2024 3:30 AM, Mike wrote:
Perhaps make a dual footprint so either will fit, as long as they have the same pin pitch!
On Wed, 12 Jun 2024, 01:22 Maciej Kawalkowski via groups.io <>, <kawalkowski.m@...> wrote:
Harvey
Since I ordered quite a large number of the 74AHCT245 i think its
better to change the PCB design accordingly. Just more wasted time
but no additional cost.
Maciej
|
Re: HP transistor 1853-0063 or alternative?
HP 1853-0063 'Motorola MJ2268' Is listed in my files as the OEM part number.
Would anyone care to suggest a suitable replacement for the HP 1853-0063? used as the 75V series pass regulator in the HP 3400A? or perhaps has one lying around in the spares drawer?? My search of eBay failed to find one.
Mine seems to be C-E short ... which is sub-optimal
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Re: HP 3852a extended memory modules info
Just make the pads longer each side, this will lose space for tracks underneath the device but that shouldn't be an issue. I've done that before as it gives a bit more versatility!
Mike:
A dual footprint should work.
The 74xxx245 in an SOIC-20 package is available with 5.3mm or 7.5mm width
You could overlay one side of the smaller part with the same side of the larger and then connect the other side with traces.
Or you could center the smaller part and allow both sets of pads to overlap.
Either should be OK for hand assembly.
Of course, any vias in pads of the smaller part would have to be moved.
ed
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Re: HP 3852a extended memory modules info
Mike:
A dual footprint should work.
The 74xxx245 in an SOIC-20 package is available with 5.3mm or 7.5mm width
You could overlay one side of the smaller part with the same side of the larger and then connect the other side with traces.
Or you could center the smaller part and allow both sets of pads to overlap.
Either should be OK for hand assembly.
Of course, any vias in pads of the smaller part would have to be moved.
ed
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Re: HP 3852a extended memory modules info
All, it seems a few people are sourcing different devices¡ ? So far I have seen the following listed in different posts¡ ? 74A245 74ACT245 74AHCT245 74HCT245 ? Just mindful that hopefully there are not differences in pinouts for each of these (sorry, I haven¡¯t had time to check) or if they might not all function correctly in this application. ? Should there be a correct version to use? Regards Nigel ?
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Show quoted text
From: [email protected] <[email protected]> On Behalf Of Maciej Kawalkowski via groups.io
Sent: Wednesday, June 12, 2024 12:23 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3852a extended memory modules info? Harvey
Since I ordered quite a large number of the 74AHCT245 i think its better to change the PCB design accordingly. Just more wasted time but no additional cost.
Maciej
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Re: HP 3852a extended memory modules info
Perhaps make a dual footprint so either will fit, as long as they have the same pin pitch!
On Wed, 12 Jun 2024, 01:22 Maciej Kawalkowski via , <kawalkowski.m= [email protected]> wrote: Harvey
Since I ordered quite a large number of the 74AHCT245 i think its better to change the PCB design accordingly. Just more wasted time but no additional cost.
Maciej
|
Re: HP transistor 1853-0063 or alternative?
Hi Robin,
Opened up my 3400 which has a 1218A prefix and has Q1 and Q2 both as 1850-0038 (date codes 1975 and 1976).? ? ? ?
My manual which covers much older prefixes, 401 with backdating for earlier 3400A's and shows Q1 to be an 1850-0098 but with Q2 as a -0038.?
I believe these are Ge transistors with the 1850 prefix as opposed to Si with the 1853 prefixes.? I have the old Bench Briefs but as you and others have found, there is no cross reference.??
Based on voltages in a manual for prefixes 401 and below, Q1 has 16.5 V across it with about 100 mA flowing thru it for a dissipation of about 1.65 W.??
Maybe this info will give you some more data to work with.??
My 3400 is still working but shows the meter fluctuating a small amount (no matter range or input level) which, reaching back 30 plus years when I worked on 3400's might be due to the chopper.? ? If I remember correctly there was a modification kit to replace the old photo chopper circuits.??
I miss working at HP (1977-2001 at the Eastern Region Repair Center in Paramus and eventually Rockaway, NJ)!?
Regards,? ?Pete
?
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Re: RED light diffusing tape used in HP instrument displays
Legends / annunciators are a special problem.? Don't know if your particular physical arrangement is covered, but this application note, which was originally HP AN-1012, has some vendor data regarding thin optical materials with adhesive backing:
-Wally
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Re: HP 3852a extended memory modules info
Harvey
Since I ordered quite a large number of the 74AHCT245 i think its better to change the PCB design accordingly. Just more wasted time but no additional cost.
Maciej
|
vk2bea
Michael A. Terrell