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Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
The HP 312 is a newer version. More commonly called a 'Frequency Selective Voltmeter'. What frequencies are you interested in? There are tons of CATV field strength meters being dumped, since the conversion to DTV. Sub band models go down to 10 MHz.
HP-Agilent-3586C-Selective-Level-Meter-Voltmeter-CALIBRATED US $1,290.00
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HP / Agilent 3586C Selective Level Meter with Option 004 (High-Stability Frequency Reference) and a current calibration good thru July 17, 2012! The 3586C selective level meter finds applications in general- purpose wave analysis for the design, manufacture, and maintenance of electronic systems. It is fully HP-IB programmable and covers the frequency range of 50 Hz to 32.5 MHz. This allows you to measure audio, sonar, and other low-frequency systems, as well as high-frequency communications subsystems. The HP 3586C provides input impedances of 50,75,and 600 fa with 10 kfl bridging for maximum measurement flexibility in a wide variety of applications. Measure signal levels with up to ± 0.2 dB accuracy down to --80 dB, with 0.01 dB resolution and bandwidth choices of 20,400,or 3100 Hz. The built-in counter and narrow-resolution bandwidths allow harmonic and intermodulation measurements to be made with ease. Frequency can be set or measured with 0.1 Hz resolution and
The HP 3581A seems to be the last of the analog "wave analyzer" instruments.
It's also called a "Frequency Selective Voltmeter".
HP 3586c is the latest I can find. The analog voltmeters have been replaced by proper spectrum analyzers.
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Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
You could buy a Signalhound, get their programming instructions (AFAIK that's pretty much open), write some SW, then create a nice GUI that looks just like in the photo. With scratches, scuff marks and all :-)
I have two of them, and last time I checked, they worked. Have the manual, too.
They are handy for low frequency stuff. I last used one for designing a 2nd-harmonic type DC current transformer.
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John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation
DAMN! Had one for years; if you had indicated the want for it before November last year, i could have sent it with manual. Had to dump it as too heavy and costly for value of use to keep. Also useful as a WWVH receiver..
A FFT spectrum analyzer can easily do a millihertz or a microhertz.
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Many thanks,
Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
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Please visit my GURU's LAIR web site at http://www.tinaja.com
Since when has an off-the-shelf spectrum analyzer been able to sweep below (say) 30Mhz? In the old daze ('60s & '70s), there may have been sub-RF plugins.
Looking at my 1977 HP Electronic Instruments Catalog, Pg 439-440, there are several that qualify.
Model Range Min BW Max BW
HP 3580A 5Hz- 50KHz 1Hz 300Hz HP 8556A 20Hz-300KHz 10Hz 10KHz Plugin for 140T
3044A/45A 10Hz- 13KHz 3Hz 10KHz (a bunch more...) HP 5390A 0.01Hz- 10KHz 100uHz 10KHz 59309A Digital Clock carrier offset
There are also a bunch of vibration analyzers that go down to fractional Hz frequencies. I'm not sure, but I believe that all the above are analog, not digital.
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
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