Cal Blacksmith Posted September 1, 2006 Share Posted September 1, 2006 I bought this meter for about $20 at a local electronics store a while ago when I was thinking about making an amp. It looked like it might be usefull so it came home with me. What the heck did I buy????[] Quote Link to comment Share on other sites More sharing options...
Coytee Posted September 1, 2006 Share Posted September 1, 2006 You bought a pig in a poke (or what ever that saying is) Clearly you got taken. You can feel free to send your hunk-o-junk to me (at your expense of course) [6] It DOES look a bit like the thingy I bought http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=017&item=270021670827&rd=1&sspagename=STRK%3AMEWN%3AIT&rd=1 Al says I can do neat things with it. Quote Link to comment Share on other sites More sharing options...
Coytee Posted September 1, 2006 Share Posted September 1, 2006 more commentary here http://forums.klipsch.com/forums/1/784988/ShowThread.aspx I've been known to use 2x6's to build a cathouse (overkill) before, so this really does seem right down my line. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted September 1, 2006 Share Posted September 1, 2006 Well, you hook the wires to electrical things and the needle goes wobbly to and fro... Quote Link to comment Share on other sites More sharing options...
picky Posted September 1, 2006 Share Posted September 1, 2006 It's a good-ole' VTVM: Vacuum Tube Voltmeter! Check out this link on Voltmeters for an explanation. VTVM is also mentioned. VTVMs are a specialized device in that they have more input sensitivity than other meters and also more input resistance: As much as 10 to 20 megohms! Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted September 1, 2006 Share Posted September 1, 2006 Richard, That meter IS an older version of the one you just bought. It's an early verson of the 400 sereis. I'm going to guess it the 400C. Al K. Quote Link to comment Share on other sites More sharing options...
Cal Blacksmith Posted September 1, 2006 Author Share Posted September 1, 2006 I guess I should say that I am not TOTALY clueless. I did know it was a VTVM, I just was not sure of what the scale markings and range markings represented. So if I get a calibrated mic it will read out DB directly? Would this be more sensitive than the standard RS DB meter? Quote Link to comment Share on other sites More sharing options...
Coytee Posted September 1, 2006 Share Posted September 1, 2006 Cal, I downloaded the manual for "mine" last night, I'll try to find it and email it to you Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted September 1, 2006 Share Posted September 1, 2006 Cal, The meter reads AC volts RMS directly. It is actually RMS calibrated average responding. 0 dB equal 1 mW (.001 Watt) into 600 Ohms. That is, 0 dB = .774V. The scales are dB above or below 1 mW into 600 Ohms. A calibrated mike will put out SOME known voltage at SOME known loudness (SPL) at the mike. The meter can be used to read dB above or below that number. It will boil down to some constant number of dB you will add (or maybe subtract) from the meter reading. Al K. Quote Link to comment Share on other sites More sharing options...
Cal Blacksmith Posted September 1, 2006 Author Share Posted September 1, 2006 Thanks Al, Coytee, that manual would be very nice to have. Thanks again guys! Quote Link to comment Share on other sites More sharing options...
Othello Posted September 4, 2006 Share Posted September 4, 2006 I just bought a meter like that, a bit newer, but the same HP series. I also bought a 50 year old HP audio oscillator to go with it. Very useful stuff. You use it to check the amplification factor of amplifiers for example. Feed a signal of some known level, lets say -40 dB, into the amp and see how much it amplifies the signal. Vary the frequency and plot the frequency response curve of your amp. I use it to change my stereo over to studio signal levels (which is 0dB), to calibrate the VU meter of my reel to reel tape machine to +6dB etc. Uwe Quote Link to comment Share on other sites More sharing options...
Coytee Posted September 5, 2006 Share Posted September 5, 2006 Thanks Al, Coytee, that manual would be very nice to have. Thanks again guys! Evidently they're under the "Agilent" name now. I got it at this website. You might be able to put your model number in the search engine and find the manual for yours. I tried to attach mine but wouldn't upload. http://www.home.agilent.com/agilent/facet.jspx?to=79841.g.1&c=76927.i.1&cc=US&lc=eng Quote Link to comment Share on other sites More sharing options...
JJkizak Posted September 5, 2006 Share Posted September 5, 2006 Used them for years. Very reliable HP stuff in the "old days". You can run them 24/7 no problem. JJK Quote Link to comment Share on other sites More sharing options...
Cal Blacksmith Posted September 7, 2006 Author Share Posted September 7, 2006 After looking at it a little, I found it is a mod 400 D, it was last certified about 10 years ago and I have not been able to find any other info on it [] Quote Link to comment Share on other sites More sharing options...
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