USB function generators?

Discussion in 'Electronic Design' started by Joerg, May 7, 2010.

  1. Joerg

    Joerg Guest

    Gents,

    Unless it rains on Sunday and I have some time I might just junk this
    dreaded Wavetek Model 23 generator. Looked around for USB-based
    generators and found a nice li'l scope/gen combo:

    http://www.allspectrum.com/store/product_info.php?products_id=2778

    Not a lot of info, seems it has no galvanic isolation from the computer
    like some others <knuckles turning white ...>. However, unlike many
    others it does go down to 5 millihertz so can be used in machine, stress
    and vibration testing which I need to do at times.

    What do thee think?

    --
    Regards, Joerg

    http://www.analogconsultants.com/

    "gmail" domain blocked because of excessive spam.
    Use another domain or send PM.
    Joerg, May 7, 2010
    #1
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  2. Joerg

    Nico Coesel Guest

    Joerg <> wrote:

    >Gents,
    >
    >Unless it rains on Sunday and I have some time I might just junk this
    >dreaded Wavetek Model 23 generator. Looked around for USB-based
    >generators and found a nice li'l scope/gen combo:
    >
    >http://www.allspectrum.com/store/product_info.php?products_id=2778
    >
    >Not a lot of info, seems it has no galvanic isolation from the computer
    >like some others <knuckles turning white ...>. However, unlike many
    >others it does go down to 5 millihertz so can be used in machine, stress
    >and vibration testing which I need to do at times.
    >
    >What do thee think?


    USB isolators are probably not expensive.

    --
    Failure does not prove something is impossible, failure simply
    indicates you are not using the right tools...
    nico@nctdevpuntnl (punt=.)
    --------------------------------------------------------------
    Nico Coesel, May 8, 2010
    #2
    1. Advertising

  3. Joerg

    Joerg Guest

    Nico Coesel wrote:
    > Joerg <> wrote:
    >
    >> Gents,
    >>
    >> Unless it rains on Sunday and I have some time I might just junk this
    >> dreaded Wavetek Model 23 generator. Looked around for USB-based
    >> generators and found a nice li'l scope/gen combo:
    >>
    >> http://www.allspectrum.com/store/product_info.php?products_id=2778
    >>
    >> Not a lot of info, seems it has no galvanic isolation from the computer
    >> like some others <knuckles turning white ...>. However, unlike many
    >> others it does go down to 5 millihertz so can be used in machine, stress
    >> and vibration testing which I need to do at times.
    >>
    >> What do thee think?

    >
    > USB isolators are probably not expensive.
    >


    In this case it would be a bit more challenging because the thing is
    also supplied via the USB jack. I could fix that, but ideally I'd like
    something I can plug in and it just works.

    --
    Regards, Joerg

    http://www.analogconsultants.com/

    "gmail" domain blocked because of excessive spam.
    Use another domain or send PM.
    Joerg, May 8, 2010
    #3
  4. "Joerg" <> wrote in message
    news:...
    > Nico Coesel wrote:
    >> Joerg <> wrote:
    >>
    >>> Gents,
    >>>
    >>> Unless it rains on Sunday and I have some time I might just junk
    >>> this dreaded Wavetek Model 23 generator. Looked around for USB-based
    >>> generators and found a nice li'l scope/gen combo:
    >>>
    >>> http://www.allspectrum.com/store/product_info.php?products_id=2778
    >>>
    >>> Not a lot of info, seems it has no galvanic isolation from the
    >>> computer like some others <knuckles turning white ...>. However,
    >>> unlike many others it does go down to 5 millihertz so can be used in
    >>> machine, stress and vibration testing which I need to do at times.
    >>>
    >>> What do thee think?

    >>
    >> USB isolators are probably not expensive.
    >>

    >
    > In this case it would be a bit more challenging because the thing is
    > also supplied via the USB jack. I could fix that, but ideally I'd like
    > something I can plug in and it just works.
    >


    We bought a few of the Keterex boxes. They work well.
    <http://www.mouser.com/ProductDetail/Keterex/KXUSB-150/?qs=%2fRwqiB95gejWb5h7F1VyFQ%3d%3d>

    Cheers
    Martin Riddle, May 8, 2010
    #4
  5. Joerg

    Joerg Guest

    Martin Riddle wrote:
    > "Joerg" <> wrote in message
    > news:...
    >> Nico Coesel wrote:
    >>> Joerg <> wrote:
    >>>
    >>>> Gents,
    >>>>
    >>>> Unless it rains on Sunday and I have some time I might just junk
    >>>> this dreaded Wavetek Model 23 generator. Looked around for USB-based
    >>>> generators and found a nice li'l scope/gen combo:
    >>>>
    >>>> http://www.allspectrum.com/store/product_info.php?products_id=2778
    >>>>
    >>>> Not a lot of info, seems it has no galvanic isolation from the
    >>>> computer like some others <knuckles turning white ...>. However,
    >>>> unlike many others it does go down to 5 millihertz so can be used in
    >>>> machine, stress and vibration testing which I need to do at times.
    >>>>
    >>>> What do thee think?
    >>> USB isolators are probably not expensive.
    >>>

    >> In this case it would be a bit more challenging because the thing is
    >> also supplied via the USB jack. I could fix that, but ideally I'd like
    >> something I can plug in and it just works.
    >>

    >
    > We bought a few of the Keterex boxes. They work well.
    > <http://www.mouser.com/ProductDetail/Keterex/KXUSB-150/?qs=%2fRwqiB95gejWb5h7F1VyFQ%3d%3d>
    >


    That could work, if it's happy with 400mA. Unfortunately a lot of stuff
    these days exceeds even the max load of 500mA, in particular disk drives.

    --
    Regards, Joerg

    http://www.analogconsultants.com/

    "gmail" domain blocked because of excessive spam.
    Use another domain or send PM.
    Joerg, May 8, 2010
    #5
  6. "Joerg" <> wrote in message
    news:...
    > Martin Riddle wrote:
    >> "Joerg" <> wrote in message
    >> news:...
    >>> Nico Coesel wrote:
    >>>> Joerg <> wrote:
    >>>>
    >>>>> Gents,
    >>>>>
    >>>>> Unless it rains on Sunday and I have some time I might just junk
    >>>>> this dreaded Wavetek Model 23 generator. Looked around for
    >>>>> USB-based generators and found a nice li'l scope/gen combo:
    >>>>>
    >>>>> http://www.allspectrum.com/store/product_info.php?products_id=2778
    >>>>>
    >>>>> Not a lot of info, seems it has no galvanic isolation from the
    >>>>> computer like some others <knuckles turning white ...>. However,
    >>>>> unlike many others it does go down to 5 millihertz so can be used
    >>>>> in machine, stress and vibration testing which I need to do at
    >>>>> times.
    >>>>>
    >>>>> What do thee think?
    >>>> USB isolators are probably not expensive.
    >>>>
    >>> In this case it would be a bit more challenging because the thing is
    >>> also supplied via the USB jack. I could fix that, but ideally I'd
    >>> like something I can plug in and it just works.
    >>>

    >>
    >> We bought a few of the Keterex boxes. They work well.
    >> <http://www.mouser.com/ProductDetail/Keterex/KXUSB-150/?qs=%2fRwqiB95gejWb5h7F1VyFQ%3d%3d>
    >>

    >
    > That could work, if it's happy with 400mA. Unfortunately a lot of
    > stuff these days exceeds even the max load of 500mA, in particular
    > disk drives.
    >


    I couldn’t say if it actually sources 400ma since our USB devices have
    their own power source.

    On another note, My laptop's USB port cannot supply power to 2 2.5"
    drives at once, nasty head movement occurs.

    Cheers
    Martin Riddle, May 8, 2010
    #6
  7. Joerg

    Joerg Guest

    Martin Riddle wrote:
    > "Joerg" <> wrote in message
    > news:...
    >> Martin Riddle wrote:
    >>> "Joerg" <> wrote in message
    >>> news:...
    >>>> Nico Coesel wrote:
    >>>>> Joerg <> wrote:
    >>>>>
    >>>>>> Gents,
    >>>>>>
    >>>>>> Unless it rains on Sunday and I have some time I might just junk
    >>>>>> this dreaded Wavetek Model 23 generator. Looked around for
    >>>>>> USB-based generators and found a nice li'l scope/gen combo:
    >>>>>>
    >>>>>> http://www.allspectrum.com/store/product_info.php?products_id=2778
    >>>>>>
    >>>>>> Not a lot of info, seems it has no galvanic isolation from the
    >>>>>> computer like some others <knuckles turning white ...>. However,
    >>>>>> unlike many others it does go down to 5 millihertz so can be used
    >>>>>> in machine, stress and vibration testing which I need to do at
    >>>>>> times.
    >>>>>>
    >>>>>> What do thee think?
    >>>>> USB isolators are probably not expensive.
    >>>>>
    >>>> In this case it would be a bit more challenging because the thing is
    >>>> also supplied via the USB jack. I could fix that, but ideally I'd
    >>>> like something I can plug in and it just works.
    >>>>
    >>> We bought a few of the Keterex boxes. They work well.
    >>> <http://www.mouser.com/ProductDetail/Keterex/KXUSB-150/?qs=%2fRwqiB95gejWb5h7F1VyFQ%3d%3d>
    >>>

    >> That could work, if it's happy with 400mA. Unfortunately a lot of
    >> stuff these days exceeds even the max load of 500mA, in particular
    >> disk drives.
    >>

    >
    > I couldn’t say if it actually sources 400ma since our USB devices have
    > their own power source.
    >


    I think that's what the Keterex datasheet says.


    > On another note, My laptop's USB port cannot supply power to 2 2.5"
    > drives at once, nasty head movement occurs.
    >


    Well, that's the other problem. I've usually already got some lab stuff
    hanging on the laptop and while this is a ruggedized computer there will
    be a limit. The Velleman datasheet isn't exactly forthcoming with data
    like that.

    --
    Regards, Joerg

    http://www.analogconsultants.com/

    "gmail" domain blocked because of excessive spam.
    Use another domain or send PM.
    Joerg, May 8, 2010
    #7
  8. Analog devices have a USB isolator IC, but you still need power isolation.

    Joe
    Joe G \(Home\), May 8, 2010
    #8
  9. "Joe G (Home)" <> wrote in message
    news:4be4c068$0$22779$...
    > Analog devices have a USB isolator IC, but you still need power
    > isolation.
    >
    > Joe
    >


    That’s what is in the Keterex box.

    Cheers
    Martin Riddle, May 8, 2010
    #9
  10. Joerg

    Nico Coesel Guest

    "" <> wrote:

    >On May 7, 2:13=A0pm, Joerg <> wrote:
    >> Gents,
    >>
    >> Unless it rains on Sunday and I have some time I might just junk this
    >> dreaded Wavetek Model 23 generator. Looked around for USB-based
    >> generators and found a nice li'l scope/gen combo:
    >>
    >> http://www.allspectrum.com/store/product_info.php?products_id=3D2778
    >>
    >> Not a lot of info, seems it has no galvanic isolation from the computer
    >> like some others <knuckles turning white ...>. However, unlike many
    >> others it does go down to 5 millihertz so can be used in machine, stress
    >> and vibration testing which I need to do at times.
    >>
    >> What do thee think?
    >>
    >> --
    >> Regards, Joerg
    >>
    >> http://www.analogconsultants.com/
    >>
    >> "gmail" domain blocked because of excessive spam.
    >> Use another domain or send PM.

    >
    >USB is always a driver hassle. I try to buy USB devices that also work
    >in Linux, so if the company goes bust, you can at least run the box
    >under linux.
    >
    >$300 would get you a nice function generator at a ham swap meet. My
    >PM5191 was $125 in a freakin' store (RA Surplus, now defunct) years
    >ago. You can't get much money for low bandwidth generators these days.


    Well... a good HP3314A still sells for a couple of hundred. More
    recent Agilent generators fetch even more. AFAIK those are USB and/or
    ethernet controllable.

    --
    Failure does not prove something is impossible, failure simply
    indicates you are not using the right tools...
    nico@nctdevpuntnl (punt=.)
    --------------------------------------------------------------
    Nico Coesel, May 9, 2010
    #10
  11. Joerg

    Nico Coesel Guest

    Joerg <> wrote:

    >Martin Riddle wrote:
    >> "Joerg" <> wrote in message
    >> news:...
    >>> Martin Riddle wrote:
    >>>> "Joerg" <> wrote in message
    >>>> news:...
    >>>>> Nico Coesel wrote:
    >>>>>> Joerg <> wrote:
    >>>>>>
    >>>>>>> Gents,
    >>>>>>>
    >>>>>>> Unless it rains on Sunday and I have some time I might just junk
    >>>>>>> this dreaded Wavetek Model 23 generator. Looked around for
    >>>>>>> USB-based generators and found a nice li'l scope/gen combo:
    >>>>>>>
    >>>>>>> http://www.allspectrum.com/store/product_info.php?products_id=2778
    >>>>>>>
    >>>>>>> Not a lot of info, seems it has no galvanic isolation from the
    >>>>>>> computer like some others <knuckles turning white ...>. However,
    >>>>>>> unlike many others it does go down to 5 millihertz so can be used
    >>>>>>> in machine, stress and vibration testing which I need to do at
    >>>>>>> times.
    >>>>>>>
    >>>>>>> What do thee think?
    >>>>>> USB isolators are probably not expensive.
    >>>>>>
    >>>>> In this case it would be a bit more challenging because the thing is
    >>>>> also supplied via the USB jack. I could fix that, but ideally I'd
    >>>>> like something I can plug in and it just works.
    >>>>>
    >>>> We bought a few of the Keterex boxes. They work well.
    >>>> <http://www.mouser.com/ProductDetail/Keterex/KXUSB-150/?qs=%2fRwqiB95gejWb5h7F1VyFQ%3d%3d>
    >>>>
    >>> That could work, if it's happy with 400mA. Unfortunately a lot of
    >>> stuff these days exceeds even the max load of 500mA, in particular
    >>> disk drives.
    >>>

    >>
    >> I couldn’t say if it actually sources 400ma since our USB devices have
    >> their own power source.
    >>

    >
    >I think that's what the Keterex datasheet says.
    >
    >
    >> On another note, My laptop's USB port cannot supply power to 2 2.5"
    >> drives at once, nasty head movement occurs.
    >>

    >
    >Well, that's the other problem. I've usually already got some lab stuff
    >hanging on the laptop and while this is a ruggedized computer there will
    >be a limit. The Velleman datasheet isn't exactly forthcoming with data
    >like that.


    If its from Velleman I'd stay away from it. They also sell kits. You
    can download the schematics from their website. The designs are far
    from brilliant and kits that are intended to be connected to the mains
    only meet the PCB design rules minimum clearance.

    --
    Failure does not prove something is impossible, failure simply
    indicates you are not using the right tools...
    nico@nctdevpuntnl (punt=.)
    --------------------------------------------------------------
    Nico Coesel, May 9, 2010
    #11
  12. Joerg

    Joerg Guest

    Nico Coesel wrote:
    > Joerg <> wrote:
    >
    >> Martin Riddle wrote:
    >>> "Joerg" <> wrote in message
    >>> news:...
    >>>> Martin Riddle wrote:
    >>>>> "Joerg" <> wrote in message
    >>>>> news:...
    >>>>>> Nico Coesel wrote:
    >>>>>>> Joerg <> wrote:
    >>>>>>>
    >>>>>>>> Gents,
    >>>>>>>>
    >>>>>>>> Unless it rains on Sunday and I have some time I might just junk
    >>>>>>>> this dreaded Wavetek Model 23 generator. Looked around for
    >>>>>>>> USB-based generators and found a nice li'l scope/gen combo:
    >>>>>>>>
    >>>>>>>> http://www.allspectrum.com/store/product_info.php?products_id=2778
    >>>>>>>>
    >>>>>>>> Not a lot of info, seems it has no galvanic isolation from the
    >>>>>>>> computer like some others <knuckles turning white ...>. However,
    >>>>>>>> unlike many others it does go down to 5 millihertz so can be used
    >>>>>>>> in machine, stress and vibration testing which I need to do at
    >>>>>>>> times.
    >>>>>>>>
    >>>>>>>> What do thee think?
    >>>>>>> USB isolators are probably not expensive.
    >>>>>>>
    >>>>>> In this case it would be a bit more challenging because the thing is
    >>>>>> also supplied via the USB jack. I could fix that, but ideally I'd
    >>>>>> like something I can plug in and it just works.
    >>>>>>
    >>>>> We bought a few of the Keterex boxes. They work well.
    >>>>> <http://www.mouser.com/ProductDetail/Keterex/KXUSB-150/?qs=%2fRwqiB95gejWb5h7F1VyFQ%3d%3d>
    >>>>>
    >>>> That could work, if it's happy with 400mA. Unfortunately a lot of
    >>>> stuff these days exceeds even the max load of 500mA, in particular
    >>>> disk drives.
    >>>>
    >>> I couldn’t say if it actually sources 400ma since our USB devices have
    >>> their own power source.
    >>>

    >> I think that's what the Keterex datasheet says.
    >>
    >>
    >>> On another note, My laptop's USB port cannot supply power to 2 2.5"
    >>> drives at once, nasty head movement occurs.
    >>>

    >> Well, that's the other problem. I've usually already got some lab stuff
    >> hanging on the laptop and while this is a ruggedized computer there will
    >> be a limit. The Velleman datasheet isn't exactly forthcoming with data
    >> like that.

    >
    > If its from Velleman I'd stay away from it. They also sell kits. You
    > can download the schematics from their website. The designs are far
    > from brilliant and kits that are intended to be connected to the mains
    > only meet the PCB design rules minimum clearance.
    >


    Yes, it is from Velleman.

    --
    Regards, Joerg

    http://www.analogconsultants.com/

    "gmail" domain blocked because of excessive spam.
    Use another domain or send PM.
    Joerg, May 9, 2010
    #12
  13. On Fri, 07 May 2010 16:17:18 -0700, Joerg <>
    wrote:

    >Nico Coesel wrote:
    >> Joerg <> wrote:
    >>
    >>> Gents,
    >>>
    >>> Unless it rains on Sunday and I have some time I might just junk this
    >>> dreaded Wavetek Model 23 generator. Looked around for USB-based
    >>> generators and found a nice li'l scope/gen combo:
    >>>
    >>> http://www.allspectrum.com/store/product_info.php?products_id=2778
    >>>
    >>> Not a lot of info, seems it has no galvanic isolation from the computer
    >>> like some others <knuckles turning white ...>. However, unlike many
    >>> others it does go down to 5 millihertz so can be used in machine, stress
    >>> and vibration testing which I need to do at times.
    >>>
    >>> What do thee think?

    >>
    >> USB isolators are probably not expensive.
    >>

    >
    >In this case it would be a bit more challenging because the thing is
    >also supplied via the USB jack. I could fix that, but ideally I'd like
    >something I can plug in and it just works.


    Indeed, the USB isolator and a self powered USB hub would be quite
    nasty.

    Perhaps a miniature laptop with big batteries could be floated with
    the test equipment, but the stray capacitances could cause problems.

    Doing measurements with the test system floating on the mains voltage
    would also be dangerous.
    Paul Keinanen, May 9, 2010
    #13
  14. Joerg

    Joerg Guest

    Paul Keinanen wrote:
    > On Fri, 07 May 2010 16:17:18 -0700, Joerg <>
    > wrote:
    >
    >> Nico Coesel wrote:
    >>> Joerg <> wrote:
    >>>
    >>>> Gents,
    >>>>
    >>>> Unless it rains on Sunday and I have some time I might just junk this
    >>>> dreaded Wavetek Model 23 generator. Looked around for USB-based
    >>>> generators and found a nice li'l scope/gen combo:
    >>>>
    >>>> http://www.allspectrum.com/store/product_info.php?products_id=2778
    >>>>
    >>>> Not a lot of info, seems it has no galvanic isolation from the computer
    >>>> like some others <knuckles turning white ...>. However, unlike many
    >>>> others it does go down to 5 millihertz so can be used in machine, stress
    >>>> and vibration testing which I need to do at times.
    >>>>
    >>>> What do thee think?
    >>> USB isolators are probably not expensive.
    >>>

    >> In this case it would be a bit more challenging because the thing is
    >> also supplied via the USB jack. I could fix that, but ideally I'd like
    >> something I can plug in and it just works.

    >
    > Indeed, the USB isolator and a self powered USB hub would be quite
    > nasty.
    >


    Another challenge in many of my jobs is the EMI that some of these
    converters kick out.


    > Perhaps a miniature laptop with big batteries could be floated with
    > the test equipment, but the stray capacitances could cause problems.
    >
    > Doing measurements with the test system floating on the mains voltage
    > would also be dangerous.
    >


    In that respect I am quite brazen but I make sure nobody gets too close
    to my lab bench while this stuff is running :)

    --
    Regards, Joerg

    http://www.analogconsultants.com/

    "gmail" domain blocked because of excessive spam.
    Use another domain or send PM.
    Joerg, May 9, 2010
    #14
  15. Joerg

    Joerg Guest

    wrote:
    > On May 8, 4:16 pm, (Nico Coesel) wrote:
    >> "" <> wrote:
    >>> On May 7, 2:13=A0pm, Joerg <> wrote:
    >>>> Gents,
    >>>> Unless it rains on Sunday and I have some time I might just junk this
    >>>> dreaded Wavetek Model 23 generator. Looked around for USB-based
    >>>> generators and found a nice li'l scope/gen combo:
    >>>> http://www.allspectrum.com/store/product_info.php?products_id=3D2778
    >>>> Not a lot of info, seems it has no galvanic isolation from the computer
    >>>> like some others <knuckles turning white ...>. However, unlike many
    >>>> others it does go down to 5 millihertz so can be used in machine, stress
    >>>> and vibration testing which I need to do at times.
    >>>> What do thee think?
    >>>> --
    >>>> Regards, Joerg
    >>>> http://www.analogconsultants.com/
    >>>> "gmail" domain blocked because of excessive spam.
    >>>> Use another domain or send PM.
    >>> USB is always a driver hassle. I try to buy USB devices that also work
    >>> in Linux, so if the company goes bust, you can at least run the box
    >>> under linux.
    >>> $300 would get you a nice function generator at a ham swap meet. My
    >>> PM5191 was $125 in a freakin' store (RA Surplus, now defunct) years
    >>> ago. You can't get much money for low bandwidth generators these days.

    >> Well... a good HP3314A still sells for a couple of hundred. More
    >> recent Agilent generators fetch even more. AFAIK those are USB and/or
    >> ethernet controllable.
    >>
    >> --
    >> Failure does not prove something is impossible, failure simply
    >> indicates you are not using the right tools...
    >> nico@nctdevpuntnl (punt=.)
    >> --------------------------------------------------------------

    >
    > The HP3314A has a control panel, so it's not like you are buying a
    > black box USB device from a Chinese company that won't exist in a few
    > years. Black boxes can become bricks if the drivers are history. ...



    How do drivers become history? With all my black boxes they came with
    the box. Ok, I do not change operating systems at every whim some guys
    in Redmond might publish. If a "new and improved" OS is not backwards
    compatible with my legacy stuff I won't buy, I'll stay with the old OS.


    > ... Think
    > about all the ISA controlled items that have become bricks. ISA GPIB
    > boards are valueable only for their trade in value with Nation
    > Instruments. Anybody need a scsi drive? Now ethernet is another story.
    > It doesn't need drivers.
    >


    Huh? You can buy plenty of brand new PCs with numerous ISA slots.
    Regular quality or industrial stuff. And I'd venture to say that you
    will find a similar selection 10 years from now.


    > I've seen the similar Fluke or Tek function generator that cuts out at
    > 11Mhz go for about $200. I think Joerg's issue is a lack of local
    > geeks. ;-) In the bay area, these items are very common on the used
    > market. Probably LA as well.
    >


    Yup, out here there's abosultely nothing going on of what you have in
    the Bay Area in terms of electronics stores. IOW, out here there are
    none left.

    --
    Regards, Joerg

    http://www.analogconsultants.com/

    "gmail" domain blocked because of excessive spam.
    Use another domain or send PM.
    Joerg, May 9, 2010
    #15
  16. Joerg

    Jamie Guest

    Joerg wrote:

    > Paul Keinanen wrote:
    >
    >> On Fri, 07 May 2010 16:17:18 -0700, Joerg <>
    >> wrote:
    >>
    >>> Nico Coesel wrote:
    >>>
    >>>> Joerg <> wrote:
    >>>>
    >>>>> Gents,
    >>>>>
    >>>>> Unless it rains on Sunday and I have some time I might just junk
    >>>>> this dreaded Wavetek Model 23 generator. Looked around for
    >>>>> USB-based generators and found a nice li'l scope/gen combo:
    >>>>>
    >>>>> http://www.allspectrum.com/store/product_info.php?products_id=2778
    >>>>>
    >>>>> Not a lot of info, seems it has no galvanic isolation from the
    >>>>> computer like some others <knuckles turning white ...>. However,
    >>>>> unlike many others it does go down to 5 millihertz so can be used
    >>>>> in machine, stress and vibration testing which I need to do at times.
    >>>>>
    >>>>> What do thee think?
    >>>>
    >>>> USB isolators are probably not expensive.
    >>>>
    >>> In this case it would be a bit more challenging because the thing is
    >>> also supplied via the USB jack. I could fix that, but ideally I'd
    >>> like something I can plug in and it just works.

    >>
    >>
    >> Indeed, the USB isolator and a self powered USB hub would be quite
    >> nasty.
    >>

    >
    > Another challenge in many of my jobs is the EMI that some of these
    > converters kick out.


    Not using potted or toroidal coils in the buck area usually causes this
    and a few bypassers here and there.

    Nice EMI radiator using open coils :)
    Jamie, May 9, 2010
    #16
  17. Joerg

    Joerg Guest

    Jamie wrote:
    > Joerg wrote:
    >
    >> Paul Keinanen wrote:
    >>
    >>> On Fri, 07 May 2010 16:17:18 -0700, Joerg <>
    >>> wrote:
    >>>
    >>>> Nico Coesel wrote:
    >>>>
    >>>>> Joerg <> wrote:
    >>>>>
    >>>>>> Gents,
    >>>>>>
    >>>>>> Unless it rains on Sunday and I have some time I might just junk
    >>>>>> this dreaded Wavetek Model 23 generator. Looked around for
    >>>>>> USB-based generators and found a nice li'l scope/gen combo:
    >>>>>>
    >>>>>> http://www.allspectrum.com/store/product_info.php?products_id=2778
    >>>>>>
    >>>>>> Not a lot of info, seems it has no galvanic isolation from the
    >>>>>> computer like some others <knuckles turning white ...>. However,
    >>>>>> unlike many others it does go down to 5 millihertz so can be used
    >>>>>> in machine, stress and vibration testing which I need to do at times.
    >>>>>>
    >>>>>> What do thee think?
    >>>>>
    >>>>> USB isolators are probably not expensive.
    >>>>>
    >>>> In this case it would be a bit more challenging because the thing is
    >>>> also supplied via the USB jack. I could fix that, but ideally I'd
    >>>> like something I can plug in and it just works.
    >>>
    >>>
    >>> Indeed, the USB isolator and a self powered USB hub would be quite
    >>> nasty.
    >>>

    >>
    >> Another challenge in many of my jobs is the EMI that some of these
    >> converters kick out.

    >
    > Not using potted or toroidal coils in the buck area usually causes this
    > and a few bypassers here and there.
    >
    > Nice EMI radiator using open coils :)
    >


    Potted or "shielded" inductors have a surprisingly large air gap,
    camouflaged by using a potting compound in "ferrite color". A guy from
    the German NG recently did a test. Soldered an LED to an inductor of
    same type, held it over the other ... and there was light :)

    --
    Regards, Joerg

    http://www.analogconsultants.com/

    "gmail" domain blocked because of excessive spam.
    Use another domain or send PM.
    Joerg, May 9, 2010
    #17
  18. Joerg

    Joerg Guest

    John Larkin wrote:
    > On Fri, 07 May 2010 14:13:49 -0700, Joerg <>
    > wrote:
    >
    >> Gents,
    >>
    >> Unless it rains on Sunday

    >
    > It's raining here, headed slowly your way.
    >


    Yup, that's why we just walked the dogs :)


    > Got leaks?
    >


    We had one that I diagnosed as too short chimney flashing, when rain
    storms in sideways. Just like Forrest Gump said, there's sideways rain,
    upside down rain, big old fat rain ...


    > Rain in May is unusual here. We had a very wet winter, lots of
    > snowpack, long hot (indoor) showers in the forecast. I hope it's a
    > trend.
    >


    My wife just lit a load in the wood stove. In May! Global warming ...
    ROFL ...

    Anyhow, two cords of wood 10 years ago, then three, now four, and next
    year we'll order five because we almost ran out this time.

    --
    Regards, Joerg

    http://www.analogconsultants.com/

    "gmail" domain blocked because of excessive spam.
    Use another domain or send PM.
    Joerg, May 9, 2010
    #18
  19. "Joerg" <> wrote in message
    news:...
    > John Larkin wrote:
    >> On Fri, 07 May 2010 14:13:49 -0700, Joerg <>
    >> wrote:
    >>
    >>> Gents,
    >>>
    >>> Unless it rains on Sunday

    >>
    >> It's raining here, headed slowly your way.
    >>

    >
    > Yup, that's why we just walked the dogs :)
    >
    >
    >> Got leaks?
    >>

    >
    > We had one that I diagnosed as too short chimney flashing, when rain
    > storms in sideways. Just like Forrest Gump said, there's sideways
    > rain, upside down rain, big old fat rain ...
    >
    >
    >> Rain in May is unusual here. We had a very wet winter, lots of
    >> snowpack, long hot (indoor) showers in the forecast. I hope it's a
    >> trend.
    >>

    >
    > My wife just lit a load in the wood stove. In May! Global warming ...
    > ROFL ...
    >
    > Anyhow, two cords of wood 10 years ago, then three, now four, and next
    > year we'll order five because we almost ran out this time.
    >


    Must be a trend. I've see quite a few front yards here where wood has
    been delivered.
    Big unsplit logs. Looks like a lot of work, they must be more than 3
    cords each.

    Cheers
    Martin Riddle, May 9, 2010
    #19
  20. Joerg

    Joerg Guest

    Martin Riddle wrote:
    > "Joerg" <> wrote in message
    > news:...
    >> John Larkin wrote:
    >>> On Fri, 07 May 2010 14:13:49 -0700, Joerg <>
    >>> wrote:
    >>>
    >>>> Gents,
    >>>>
    >>>> Unless it rains on Sunday
    >>> It's raining here, headed slowly your way.
    >>>

    >> Yup, that's why we just walked the dogs :)
    >>
    >>
    >>> Got leaks?
    >>>

    >> We had one that I diagnosed as too short chimney flashing, when rain
    >> storms in sideways. Just like Forrest Gump said, there's sideways
    >> rain, upside down rain, big old fat rain ...
    >>
    >>
    >>> Rain in May is unusual here. We had a very wet winter, lots of
    >>> snowpack, long hot (indoor) showers in the forecast. I hope it's a
    >>> trend.
    >>>

    >> My wife just lit a load in the wood stove. In May! Global warming ...
    >> ROFL ...
    >>
    >> Anyhow, two cords of wood 10 years ago, then three, now four, and next
    >> year we'll order five because we almost ran out this time.
    >>

    >
    > Must be a trend. I've see quite a few front yards here where wood has
    > been delivered.
    > Big unsplit logs. Looks like a lot of work, they must be more than 3
    > cords each.
    >


    Well, it's _hugely_ less expensive than heating with propane or electric
    heat pumps.

    --
    Regards, Joerg

    http://www.analogconsultants.com/

    "gmail" domain blocked because of excessive spam.
    Use another domain or send PM.
    Joerg, May 9, 2010
    #20
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