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Re: Is For Sale Messages OK ?
Didier Juges
You would not be the first one, or the last one :-)
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Didier KO4BB Richard W. Solomon wrote: I have several pieces of HP Test Equipment that I need to |
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8505A counter problem
I posted the following on the 8505A group but I'm not sure if anyone
is using it. All my messages come from here so I will repeat it here. My HP 8505A Freq Counter displays incorrectly. The actual frequency out seems normal in CW and Sweep modes on all three ranges but the counter reads three times the frequency. When increasing the frequency slowly (CW) the units and tens increment correctly but the hundreds digit counts 1, 3, 5, 7, 9 (I'm talking about the third digit from the right, ignoring the decimal point). The higher digits count OK but the third digit seems to change going 33, 66 and 99 on the lowest digits but not every time. It depends on the value of the third digit. Refer to Fig C3-66 A2A5 Prescaler/Counter schematic: U6 (a 4029 presettable up/down CMOS counter is acting up; The QA (pin 6) output stays high, the other outputs seem normal as though there were twice the number of input pulses, but there are only 5 input pulses on pin 15 between the Carry Out pulses (pin 7). It seems like the input pulses are bypassing the first flip-flop. I checked every pin signal, the +5 volts, and looked for noise or oscillations with a 300 MHz `scope (Tek 2465). I cut the trace from pin 6 to U13 pin 2, no difference. I placed a 1K resistor from pin 15 to +5 volts to sharpen the input pulses, no difference. I then replaced the 4029 chip (U6) but there was no change. I then bread- boarded the U6 and U3B circuit and it works perfectly. I shorted pin 6 to the +5 volts and it still works perfectly. I lowered the power supply to 4 volts and it still works. Now I wish I had socketed the 4029 instead of soldering it in. I may do that yet - cut all pins, unsolder pins one at a time, solder suck the holes, clean and install. Does anyone have any other suggestions? My brain is about to implode. Peter. |
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Re: Is For Sale Messages OK ?
list them please
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----- Original Message -----
From: Richard W. Solomon To: hp_agilent_equipment@... Sent: Wednesday, January 24, 2007 6:43 PM Subject: [hp_agilent_equipment] Is For Sale Messages OK ? I have several pieces of HP Test Equipment that I need to pass on before I move. Is it proper to list them here ? Thanks, Dick, W1KSZ |
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HP 5351B counter
Steve
I ran across an HP 5351B counter that looks to be in good shape cosmetically and operationally. The guy said he'd think about selling it to me.
What's the price range? It hasn't been calibrated for several years, so if I buy it I'll likely send it to a cal lab. Anyone have experience with this counter? Does it have a history of problems? A good reputation? Other? Thanks. Steve K8JQ |
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HP 410C VTVM
David C. Hallam
I am probably one of a long list of people but I am looking for the upper
half of the AC probe for a 410C VTVM. I have the lower portion that has the connector lead and socket for EA53 tube. I have the tube too. I need the shell that screws into the ring on the lower part, bypass capacitor and tip portion with spring connection for the EA53. David KC2JD/4 |
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Re: 180A Question
Paul Jacobson
Hi Bruce,
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I noticed while looking thru the 180C/D manual available from the Agilent site a list of standard options in Secition 7-5 (page 7-4): "Option H03 - Standard model 180C is modified to provide 10 mV/div maximum sensitivity for the horizontal amplifer." don't know if this is the same on the 180A? It would seem likely however. cheers Paul On 24/01/2007, at 11:07 AM, BSugarberg wrote:
Hello, |
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Re: 180A Question
BSugarberg
Hello,
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On the front of the scope, under the bezel, it says: "180A Oscilloscope - Option HO3". The scope also has the following stickers: "Northern Telecom, Montreal" and "Bell Canada - T. A. Engineering - Test Set". (There could be something else on the 2nd sticker, but the part under "Test Set" is covered by another "Bell Canada" sticker). Perhaps the HO3 Option was something special for Bell Canada, or for telephone work? The plug-ins: 1801A Dual Channel Vertical Amplifier (50 MHz). 1821A Time Base and Delay Generator. S/N: 975-10237. Thank you, Bruce ================= JOHN BYERS wrote: Hi Bruce |
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Re: HP 5328A Power Supply Issue
--- In hp_agilent_equipment@..., "Craig Sawyers"
<c.sawyers@...> wrote: I haven't looked at the schematics, so I'm shooting from the hiphere. My 5328A started to smell of stale cat's pee - it was otherwise workingthough. Turned out that the two screw-mounted reservoir caps at the rear of the Thanks Craig, I did suspect those two caps and since they can be removed easily. I temporarily traded them with a pair from a good working 5328A (about 4 years newer according to the date codes) and I get the same results. There are a couple of smaller (47uf I believe) three legged caps in the circuit which I've not looked at though. I did notice that while the power supply is under load and going out of regulation, I can hear a faint "chirping" such as one hears with an overloaded switching power supply or microwave oven when it loads up the magnatron. I just wonder if anyone here has done any extensive troubleshooting on these counters. They look fairly straight forward in design..... Chuck |
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Re: HP 5328A Power Supply Issue
I'm sure the reason for the instability must be related to the 25 voltI haven't looked at the schematics, so I'm shooting from the hip here. My 5328A started to smell of stale cat's pee - it was otherwise working though. Turned out that the two screw-mounted reservoir caps at the rear of the board were on their last legs - not leaking as such, but clearly not healthy. Just replaced them with modern components, and all was OK thereafter - the cat was banished. Craig |
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Re: HP 8552B Question
--- In hp_agilent_equipment@..., Robert Hagenbach
<rc_hagenbach@...> wrote: Hi Bob -- Option H23 was installed on units that were intended to be used with the automatic spectrum analyzer 8580A. It provided two "features": 1. Wiring changes necessary to disable the front panel controls during automatic instrument operation. 2. Rear panel change necessary to permit programmed inputs and permit installation in an 85802A. No other specifications were affected by this special option. |
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HP 5328A Power Supply Issue
I recently purchased a (non-military) HP 5328A w/options 10, 20, 30,
41 for the covers and "C" option for one of my good units. Just for fun, I thought that I'd troubleshoot the power supply problem in this chassis. It fires up normally for a few minutes after which time the display gets flakey loosing characters occasionally. The frequency readout also starts wandering around below 10>4 and locks up good for a second or two. I checked the power supply board for bad/burnt connections and all power transistors for looseness against the chassis heat sink. No capacitors are swollen or leaking. All of the voltages are initially within 10 pct or so of their ratings with minimum AC ripple. The one exception is the +25 v line which starts out at 25.3 volts and remains until a display mode is selected which illuminates 7 or more characters. I.e. "freq check" mode. It then drops to about 23.8 volts and the AC ripple increases to around 1.5 VAC. Btw- the 25 volt line stays stable while in standby mode w/counter off. Every option has been removed from the counter except the "Display Unit", Display Control PCB" and "10544A Oscillator" All of the components were checked in a known good counter and they are very stable. I'm sure the reason for the instability must be related to the 25 volt line going out of regulation under load but I'm at a lose to understand why. Chuck |
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Re: HP 1661C, Comments
John Day
At 03:24 AM 1/23/2007, John Kolb wrote:
It's a fime unit.I have a 1660C as well as a pretty large complement of 16500 system. The 1660C is good, and I wont be selling it, but I wish it were a CS (with oscilloscope) version. More of my time is spent using the 16500 because I have the CRO module and some deep sampling modules - things I cannot do with the 1660C. John At 01:47 AM 1/22/2007, you wrote:Thinking of getting a HP 1661C Logic Analyzer.<> |
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Re: Boy, did I mess up (FTP issue)
Jos Raven
Paul,
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that fixed it, you hit the nail on its head. Thanks a lot, Jos At 20:32 23-1-2007 +1100, you wrote:
Jos, |
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Re: Boy, did I mess up (FTP issue)
Paul Jacobson
Jos,
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looks like you might need to check the config of your FTP program. It looks like its configured to use active mode - the PORT command is issued when using active mode, so this is a pretty clear indicator of where the problem lies . Active transfers will generally not work correctly behind a firewall. Try changing the settings to Passive mode and you should be good to go. Step 5 on this page this should explain how to configure your FTP client: cheers Paul On 23/01/2007, at 8:09 PM, Jos Raven wrote:
I get a connection but that is all. |
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Re: Boy, did I mess up (FTP issue)
Jos Raven
I get a connection but that is all.
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This is the log of FTP Voyager; 23-1-2007 9:34:39:>STATUS:> Connecting to "ftp.bluefeathertech.com" on port 50021. 23-1-2007 9:34:39:> 220 ProFTPD 1.3.0 Server (Blue Feather Technologies FTP Archive) [216.162.215.97] 23-1-2007 9:34:39:>STATUS:> Connected. Logging into the server 23-1-2007 9:34:39:>COMMAND:> USER anonymous 23-1-2007 9:34:39:> 331 Anonymous login ok, send your complete email address as your password. 23-1-2007 9:34:39:>COMMAND:> PASS **** 23-1-2007 9:34:39:> 230 Anonymous access granted, restrictions apply. 23-1-2007 9:34:39:>STATUS:> Login successful 23-1-2007 9:34:39:>COMMAND:> REST 100 23-1-2007 9:34:39:> 501 REST: Resuming transfers not allowed in ASCII mode 23-1-2007 9:34:39:>STATUS:> Server does NOT support resume 23-1-2007 9:34:39:>COMMAND:> PWD 23-1-2007 9:34:39:> 257 "/" is current directory. 23-1-2007 9:34:39:>COMMAND:> CWD / 23-1-2007 9:34:39:> 250 CWD command successful 23-1-2007 9:34:39:>COMMAND:> TYPE A 23-1-2007 9:34:39:> 200 Type set to A 23-1-2007 9:34:39:>COMMAND:> PORT 192,168,1,100,4,70 23-1-2007 9:34:39:> 500 Illegal PORT command Jos Raven At 07:48 23-1-2007 +0000, you wrote:
works fine for me |
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Re: HP 1661C, Comments
It's a fime unit.
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John At 01:47 AM 1/22/2007, you wrote:
Thinking of getting a HP 1661C Logic Analyzer. |
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Re: Boy, did I mess up (FTP issue)
works fine for me
Ray J --- In hp_agilent_equipment@..., "Bruce Lane" <kyrrin@...> wrote: Blue Feather's FTP server over the past couple of months. I shot myself in the foot by not including a rule in our firewall to allow traffic through on the new port I assigned. ftp.bluefeathertech.com on port 50021. with surreal ports?" |
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Re: Boy, did I mess up (FTP issue)
You're most welcome. Thanks for the news.
* REPLY SEPARATOR * On 23-Jan-07 at 16:23 Paul Jacobson wrote: Hi Bruce,Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- kyrrin (at) bluefeathertech do/t c=o=m "If Salvador Dali had owned a computer, would it have been equipped with surreal ports?" |
Bruce Lane
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