Hi All.
Dose anyone out there know anything about the pictured Stark VT-9 multimeter.
I can figure out the AC/DC/R functions well enough - its the alleged capacitance and inductance measurements that have me mystified.
A web search of Stark VT-9 produces a resounding silence.
Any suggestions from you retired(?) technicians would be very helpful indeed.
Thanks to all
Jess
Dose anyone out there know anything about the pictured Stark VT-9 multimeter.
I can figure out the AC/DC/R functions well enough - its the alleged capacitance and inductance measurements that have me mystified.
A web search of Stark VT-9 produces a resounding silence.Any suggestions from you retired(?) technicians would be very helpful indeed.
Thanks to all
Jess
An externally hosted image should be here but it was not working when we last tested it.
Good to know that at least one more of these survived
Well, I guess if no one has a manual, I will just have to trace the cct and draw it up so that one of the wizards out there can lett us how to use the dratted thing!
Mine works beautifully for AC/DC/R - checked against my DVM it is as accurate as any analog meter I've ever seen. And that huge meter - just georgeous.
As I said before, I want to learn how to make inductance measurements. And, how does one use the db scale(s) on the bottom of the meter face?
Cheers
Jess
Hi Chris:
Now, that's why I love this forrum so much - just ask and someone will know the answer
Of course, it helps if I have the background to understand the answer Could you maybe draw me a simple diagram to show me (I'm a computer nerd, y'know - not much depth in this analog electronics stuff) what you mean by
"assumes you are across a 600 ohm line for dBm"
Is db used to measure relative signal strength? Like, can it be used to measure the gain of a preamp in db?
Jess
Now, that's why I love this forrum so much - just ask and someone will know the answer
Of course, it helps if I have the background to understand the answer
Could you maybe draw me a simple diagram to show me (I'm a computer nerd, y'know - not much depth in this analog electronics stuff) what you mean by "assumes you are across a 600 ohm line for dBm"
Is db used to measure relative signal strength? Like, can it be used to measure the gain of a preamp in db?
Jess
Hi Jess,
A diagram won't help much. dB ratings are power measurements and are assumed to be across a 600 ohm load (resistor for example). Changing the load impedance changes the power dissipated in the load.
These days in the audio field we use dBu. It's the same except that we ignore the impedance and refer the measurement to a voltage only. Your old scale was referrenced to 0.775 V across 600 ohms.
This link http://en.wikipedia.org/wiki/Decibels should help you understand it a little better.
-Chris
A diagram won't help much. dB ratings are power measurements and are assumed to be across a 600 ohm load (resistor for example). Changing the load impedance changes the power dissipated in the load.
These days in the audio field we use dBu. It's the same except that we ignore the impedance and refer the measurement to a voltage only. Your old scale was referrenced to 0.775 V across 600 ohms.
This link http://en.wikipedia.org/wiki/Decibels should help you understand it a little better.
-Chris
If you mean the photo in the first post - you're right (D#%$&^!)
I always have trouble with pix. Hope this one works.
If you mean the wiki page - it worked OK for me.
Here's the stark pix (sorry)
Jess
An externally hosted image should be here but it was not working when we last tested it.
Hi Jess,
That's odd. It looks a bit like mine ... I bought mine from Crown Assets Disposal as a young fella.
What we need is a site with all kinds of Stark information on it. If you see a working Stark 9-66 (or better) tube tester, get it.
I also have a Stark 10A generator that matches the VTVM. Not working because I modified it before I grew brain cells.
-Chris
That's odd. It looks a bit like mine ... I bought mine from Crown Assets Disposal as a young fella.
What we need is a site with all kinds of Stark information on it. If you see a working Stark 9-66 (or better) tube tester, get it.
I also have a Stark 10A generator that matches the VTVM. Not working because I modified it before I grew brain cells.
-Chris
AMEN, brother!
Actually, I will garb any tube tester, working or not (but from now on a Stark 9-66 will be on top of my list)
Not being a collector (at least not intentionally) of vintage test equipment, I think I will stick with my computer for signal generation. Most of my gear shelf already looks older that I am.
Jess
Hi Jess,
Hickok would be another good tester. You need "dynamic mutual conductance" and these testers perform their tests that way. Stark was made under license from Hickok and can be found as Canadian military surplus. The prices have gotten high these days though.
Emission type testers are not that helpful. These are generally sold higher than they should be, you need to know what you are buying.
-Chris
Hickok would be another good tester. You need "dynamic mutual conductance" and these testers perform their tests that way. Stark was made under license from Hickok and can be found as Canadian military surplus. The prices have gotten high these days though.
Emission type testers are not that helpful. These are generally sold higher than they should be, you need to know what you are buying.
-Chris
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