Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- HP-Agilent-Keysight-Equipment
- Messages
Search
|
Re: Tunnel Diode Questions
Stuart - the TD amps do use circulators. I have some Impatt amps for 44
toggle quoted message
Show quoted text
ghz with the same design. Will In a message dated 9/6/2011 11:53:31 A.M. Pacific Daylight Time,
stuartl73@... writes: The complication with using a tunnel diode as an amplifier is that it's a one port device! The input is also the output. By using circulators it can be made to work. It was an inexpensive alternative to Masers and Parametric amplifiers, until transistors caught up. -----Original Message----- From: w0eom <_w0eom@... (mailto:w0eom@...) > To: hp_agilent_equipment <_hp_agilent_equipment@... (mailto:hp_agilent_equipment@...) > Sent: Tue, Sep 6, 2011 10:33 am Subject: Re: [hp_agilent_equipment] Re: Tunnel Diode Questions I have two tunnel diode microwave amps here, saved from many years ago. The first time i tested them, i put in 0 dbm and got little gain. that was way too much drive for the amp. Will In a message dated 9/6/2011 9:18:01 A.M. Pacific Daylight Time, _stuartl73@... (mailto:stuartl73@...) writes: Very few tunnel diodes were used as microwave amplifiers. Usually they were used to provide a trigger pulse for an oscilloscope or very fast pulse for TDR or sampling scopes. If you need triggering, consider the way HP used ECL integrated circuits in their 275 MHz analog oscilloscopes, where Tektronix used tunnel diodes. In my opinion, having owned both, the HP scope trigger was superior. Stuart K6YAZ Los Angeles, CA -----Original Message----- From: br4av01 <__br4av01@... (mailto:_br4av01@...) _ (mailto:_br4av01@... (mailto:br4av01@...) ) > To: hp_agilent_equipment <__hp_agilent_equipment@... (mailto:_hp_agilent_equipment@...) _ (mailto:_hp_agilent_equipment@... (mailto:hp_agilent_equipment@...) ) > Sent: Tue, Sep 6, 2011 7:58 am Subject: [hp_agilent_equipment] Re: Tunnel Diode Questions Thanks, Gents, That clarifies the issue for me. Early transistors were mostly low frequency as I remember. If I am confronted with one of those tunnel diode circuits, I will consider using fast op-amps or RF transistors in the circuit. -br4 K7PHX [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] |
|
Re: Tunnel Diode Questions
The complication with using a tunnel diode as an amplifier is that it's a one port device! The input is also the output. By using circulators it can be made to work. It was an inexpensive alternative to Masers and Parametric amplifiers, until transistors caught up.
toggle quoted message
Show quoted text
-----Original Message-----
From: w0eom <w0eom@...> To: hp_agilent_equipment <hp_agilent_equipment@...> Sent: Tue, Sep 6, 2011 10:33 am Subject: Re: [hp_agilent_equipment] Re: Tunnel Diode Questions I have two tunnel diode microwave amps here, saved from many years ago. The first time i tested them, i put in 0 dbm and got little gain. that was way too much drive for the amp. Will In a message dated 9/6/2011 9:18:01 A.M. Pacific Daylight Time, stuartl73@... writes: Very few tunnel diodes were used as microwave amplifiers. Usually they were used to provide a trigger pulse for an oscilloscope or very fast pulse for TDR or sampling scopes. If you need triggering, consider the way HP used ECL integrated circuits in their 275 MHz analog oscilloscopes, where Tektronix used tunnel diodes. In my opinion, having owned both, the HP scope trigger was superior. Stuart K6YAZ Los Angeles, CA -----Original Message----- From: br4av01 <_br4av01@... (mailto:br4av01@...) > To: hp_agilent_equipment <_hp_agilent_equipment@... (mailto:hp_agilent_equipment@...) > Sent: Tue, Sep 6, 2011 7:58 am Subject: [hp_agilent_equipment] Re: Tunnel Diode Questions Thanks, Gents, That clarifies the issue for me. Early transistors were mostly low frequency as I remember. If I am confronted with one of those tunnel diode circuits, I will consider using fast op-amps or RF transistors in the circuit. -br4 K7PHX [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] |
|
3325B FAIL 023 issue
Rico
Hi,
Recently, FAIL 023 appears on selftest on my signal generator. According to the service manual, FAIL 023 refers to DC OFFSET TOO POSITIVE DURING CALIBRATION. Generator frequency is accurate. Internal lithium battery gives 3.15 volts and I tight all PCB screws and ground. Before digging to far into the service manual, I was wondering if someone else had this issue before and what was the fix ?? Sincerely, Eric Dussault VE2TSO |
|
Re: Tunnel Diode Questions
I have two tunnel diode microwave amps here, saved from many years ago.
toggle quoted message
Show quoted text
The first time i tested them, i put in 0 dbm and got little gain. that was way too much drive for the amp. Will In a message dated 9/6/2011 9:18:01 A.M. Pacific Daylight Time,
stuartl73@... writes: Very few tunnel diodes were used as microwave amplifiers. Usually they were used to provide a trigger pulse for an oscilloscope or very fast pulse for TDR or sampling scopes. If you need triggering, consider the way HP used ECL integrated circuits in their 275 MHz analog oscilloscopes, where Tektronix used tunnel diodes. In my opinion, having owned both, the HP scope trigger was superior. Stuart K6YAZ Los Angeles, CA -----Original Message----- From: br4av01 <_br4av01@... (mailto:br4av01@...) > To: hp_agilent_equipment <_hp_agilent_equipment@... (mailto:hp_agilent_equipment@...) > Sent: Tue, Sep 6, 2011 7:58 am Subject: [hp_agilent_equipment] Re: Tunnel Diode Questions Thanks, Gents, That clarifies the issue for me. Early transistors were mostly low frequency as I remember. If I am confronted with one of those tunnel diode circuits, I will consider using fast op-amps or RF transistors in the circuit. -br4 K7PHX [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] |
|
Re: Tunnel Diode Questions
J. Forster
Consider hard.
toggle quoted message
Show quoted text
Frankly, I think you'll have a hard time replicating some of the functions of a fast TD triggere or switch. -John ================
|
|
Re: Triangle to Since Conversion
J. Forster
Any function generator that does not use a D/A and a LUT works that way.
toggle quoted message
Show quoted text
This includes Wavetek, HP, Tek and others. Have you looked at the parts list for your instrument? -John =============== For a certain time maybe '60's and '70's many of the HP analog generators |
|
Re: Tunnel Diode Questions
Very few tunnel diodes were used as microwave amplifiers. Usually they were used to provide a trigger pulse for an oscilloscope or very fast pulse for TDR or sampling scopes. If you need triggering, consider the way HP used ECL integrated circuits in their 275 MHz analog oscilloscopes, where Tektronix used tunnel diodes. In my opinion, having owned both, the HP scope trigger was superior.
toggle quoted message
Show quoted text
Stuart K6YAZ Los Angeles, CA -----Original Message-----
From: br4av01 <br4av01@...> To: hp_agilent_equipment <hp_agilent_equipment@...> Sent: Tue, Sep 6, 2011 7:58 am Subject: [hp_agilent_equipment] Re: Tunnel Diode Questions Thanks, Gents, That clarifies the issue for me. Early transistors were mostly low frequency as I remember. If I am confronted with one of those tunnel diode circuits, I will consider using fast op-amps or RF transistors in the circuit. -br4 K7PHX [Non-text portions of this message have been removed] |
|
Re: Request: Comments on modern Multi-Meters
On Tue, Sep 6, 2011 at 9:24 AM, br4av01 <br4av01@...> wrote:
I loved my Simpson 260 and for years that's all I needed, then came the Fluke 8050a style bench meters and handhelds - used those for years. Punching those mechanical buttons on the 8050a all the time sure got old. ?The new style 84401, etc. look great, but I'm looking for a working bench meter and not a laboratory standard.I'm going to guess that you mean the 34401A. Do I have to navigate through a menu system every time I switch from voltage to resistance?No, but the manual is right there on agilent.com so you can see for yourself when you have to use the menu. Is constant manual setting of the measurement range necessary (I have to do this constantly with my Fluke 87)?Hard to answer when you don't say *why* you are constantly setting the range on the Fluke 87. If you don't like autorange on that meter, you might not like it on any other meter either. |
|
Re: Noise figure meas. of a S.A.
Dear Marco and Gianfranco, your explanations are right , If the equipment has this feature, you can also use the Marker noise function to display the average Noise Power density expressed in dBc(1Hz),This is displayed with this feature and you can directly calculate your NF of the SA doing 174-Noise power density=NF
toggle quoted message
Show quoted text
When you make this measurement don't forget to put the input attenuator to 0 dB so you will obtain the minimum Noise Figure in dB. 73's QRO ON1EV Guerrino --- In hp_agilent_equipment@..., Marco IK1ODO -2 <ik1odo@...> wrote:
|
|
Re: Noise figure meas. of a S.A.
At 13:27 06-09-11, you wrote:
Dear Gianfranco, thermal noise power density at 300 K is approx -174 dBm/Hz. 174-137 gives 37 dB NF - a little high for a S/A. My ADV R3361A specification says (page 10-3) thet the average noise level is -121 dBm in 300 Hz IF BW. 10*log(300) is 25 dB, so the noise density is -146 dBm/Hz. That implies a noise figure of 174-146=28 dB, more reasonable. I get usually 25 dB on average instruments. And with your Ailtech noise source (it should have 15 dB ENR) you hardly see a noise increment :-) 73 - Marco IK1ODO |
|
Noise figure meas. of a S.A.
Hi,
I am trying to measure/calculate the noise figure of my S.A.(Advantest3361). -the specification says "Average noise level -121dBm; I am surprise that this indication is a power not specifying any band width - I have made a noise level measurement of the "grass ", no imput to the S.A. , and the actual value is -137dBm/Herz - I have used a noise generator Ailtech 25dB ENR but there is no effect on the grass level swtching on/off Can anybody help me to put some order on the matter ? Regards Thanks Gianfranco |
|
Re: Info about 9100-3451 or 9100-3882 HP 3552A data line test set Power Transformer
Artekmedia
Ciro
toggle quoted message
Show quoted text
My (readable :-) ) copy of the manual lists T1 part number as 9100-3882 . Unfortunately the manufacturer is listed as Hewlett Packard so it is unlikely you will ever be able to get the "specs" for the 3 secondary windings. The unit could be powered via a set of remote supplies using the battery input contacts ,. It takes 3 separate supplies +5v, +12v and -12V. I suspect no more than a few amps each. Why do you believe that T1 is faulty? Contact me off list directly at manuals@... if you would like to discuss getting a readable copy of the manual Dave Artekmedia On 9/5/2011 6:00 PM, cc_electronic wrote:
--
Dave& Lynn Henderson Manuals@... www.Artekmedia.com PO Box 175 Welch,MN 55089 |
|
Info about 9100-3451 or 9100-3882 HP 3552A data line test set Power Transformer
Hello all!
I have an HP3552A which has (I believe...) its power transformer faulted. The P/N on its body is 9100-3882 but the code read on the service manual is 9100-3451 (T1). This part cannot be found. I thought of replacing it by a generic one but I don't know its features and the electric diagrams of service manual (downloaded from HP archive) are unreadable. I see only two secondary windings to power all circuits and another one for batteries charger. Manual unreadable is here: Can you help me, please? Regards Ciro |
|
Re: Tunnel Diode Questions
Hi Tom yes they are basically very simple but in the 60s they were extremely
toggle quoted message
Show quoted text
difficult to make reliably. Modern technology vapour-phase deposition, ion mplantation etc makes then much easier to produce, but they are very low power devices and they perfomance is probably only requird in some special circumstances. You need to make a diode with hightly doped N and P sides with and extremely narrow junction (transition region) narrower than the tunnelling length, a quantum effect. You have great difficulty controlling an alloy proceses to produce this, and diffusion gives too wide a junction. Modern "growth" techiques where you grow a single crystal layer of heavily doped N suddenly switched to heavily doped P is relatively easy. I think the problem occurs in the stresses this leaves in the crystal due to the mismatch with the size of the doping atoms. If I remember correctly the characteristc depends on carrier tunnelling at low voltages and snaps to a normal diode curve as the voltage is increased. So you can never get a "signal" of more than a few 10s to100s mV from an oscillator or amplifier. The usual way to remove stress is to thermally anneal , but if you do that the junction diffuses and can become too wide for tunnelling. So like all solid state technology there are a basketful of compromises. I suspect we are going OT but HP and other high end test gear makers did use these devices to good effect. Alan G3NYK ----- Original Message -----
From: "Tom Miller" <tmiller@...> To: <hp_agilent_equipment@...> Sent: Monday, September 05, 2011 9:43 PM Subject: Re: [hp_agilent_equipment] Re: Tunnel Diode Questions I thought tunnel diodes were simple.not bad.
|
|
Re: Tunnel Diode Questions
Tom Miller
I thought tunnel diodes were simple.
toggle quoted message
Show quoted text
You can get GaAs and Ge tunnel diodes from Russia on ebay and the price is not bad. Some 4.5 mA Ge diodes . Tom ----- Original Message -----
From: J. Forster To: hp_agilent_equipment@... Sent: Monday, September 05, 2011 3:35 PM Subject: Re: [hp_agilent_equipment] Re: Tunnel Diode Questions There are very few simple ways to get pS pulses, even today. -John ================= > There are other diodes that have negative resistance regions, such as the > Gunn, with characteristics similar to TDs, but used pretty much only for > microwave oscillators, and the DIAC (if you count 4-layer devices), which > is very slow, typically used for triggering thyristors. > > The tunnel diode back in the 1960s was common enough to use ubiquitously, > and GE promoted it (of course) as an active element for lots of circuits - > even where just plain old germanium transistors worked better. Engineers > knew enough to use this latest, greatest, but more expensive thing only > where it made sense, like in high speed switching cicuits. > > Ed > > --- In hp_agilent_equipment@..., "Peter Reilley" <peter@...> > wrote: >> >> The important characteristic of a tunnel diode is it's negative >> resistance region. >> This provides a switch action that can snap on far faster than anything >> else available >> at the time. Tunnel diodes are unique, no other diode has a negative >> resistance region. >> >> A PIN diode is a diode that is used as a variable capacitor. The >> applied voltage >> changes the capacitance across the junction. The voltage is applied in >> the >> non-conducting direction. Most conventional diodes have this >> characteristic >> but are not optimized for this purpose. >> >> While they are both diodes neither is used as a conventional diode would >> be. >> >> Pete. >> >> >> ----- Original Message ----- >> From: br4av01 >> To: hp_agilent_equipment@... >> Sent: Monday, September 05, 2011 12:31 PM >> Subject: [hp_agilent_equipment] Tunnel Diode Questions >> >> >> >> It is obvious that HP and Tektronix designers had a great fondness for >> the tunnel diode. You can find them incorporated into lots of scopes >> and other test equipment. Now that tunnel diodes are not produced, I >> wanted to ask what design approaches make this device no longer >> necessary. The recently discussed 3310b generator uses tunnel diodes >> in the triangle generation stage to compensate triangle + and - >> current sources as frequency is increased. What design modifications >> (staying in the analog realm) could be used to accomplish the same >> thing with currently available devices. Are PIN diodes of any use for >> these purposes? >> >> Thanks! >> -br4 >> >> >> >> >> >> >> > > > |
|
Re: Tunnel Diode Questions
Verner Tops?e-Jensen
Tunnel diodes are still available from "American Microsemiconductor Inc."
toggle quoted message
Show quoted text
I got a promoting mail from them a couple of month ago. Look at Expensive - but available. Regards Vern ----- Original Message -----
From: "J. Forster" <jfor@...> To: <hp_agilent_equipment@...> Sent: Monday, September 05, 2011 9:35 PM Subject: Re: [hp_agilent_equipment] Re: Tunnel Diode Questions There are very few simple ways to get pS pulses, even today. |
|
Re: Tunnel Diode Questions
J. Forster
There are very few simple ways to get pS pulses, even today.
toggle quoted message
Show quoted text
-John ================= There are other diodes that have negative resistance regions, such as the |
to navigate to use esc to dismiss