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On Sun, 10 Jan 2016 19:38:00 -0800 (PST), Ivan Vegvary
ivanvegvary@gmail.com> wrote:
"Peak-to-Peak" meter.
For what are (were) they used? Got it for free.
Is it simply so I don't have to multiply by 1.414?
Be gentle. I'm new at all this and trying to learn.
Ivan Vegvary
Like this Senco PP2 ?
http://www.ebay.com/itm/151944955761
http://www.ebay.com/itm/300846516496
It's not really a "meter". It's a "Peak to Peak Comparison Meter",
whatever that means.
What's inside:
http://i.ebayimg.com/images/a/%28KGrHqN,!ikFCd%28btD-8BQ8wKmgb-!~~/s-l1600.jpg
I couldn't find a manual or schematic. I have only some bad guesses
as to what it does and how it works. At least you didn't pay any
money for it.
--
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
"Peak-to-Peak" meter.
For what are (were) they used? Got it for free.
Is it simply so I don't have to multiply by 1.414?
Be gentle. I'm new at all this and trying to learn.
Ivan Vegvary
"Peak-to-Peak" meter.
For what are (were) they used? Got it for free.
Is it simply so I don't have to multiply by 1.414?
Be gentle. I'm new at all this and trying to learn.
Ivan Vegvary
"Peak-to-Peak" meter.
For what are (were) they used? Got it for free.
Is it simply so I don't have to multiply by 1.414?
Be gentle. I'm new at all this and trying to learn.
Ivan Vegvary
On Sun, 10 Jan 2016 19:38:00 -0800 (PST), Ivan Vegvary
ivanvegvary@gmail.com> wrote:
"Peak-to-Peak" meter.
For what are (were) they used? Got it for free.
Is it simply so I don't have to multiply by 1.414?
Be gentle. I'm new at all this and trying to learn.
Ivan Vegvary
Like this Senco PP2 ?
http://www.ebay.com/itm/151944955761
http://www.ebay.com/itm/300846516496
It's not really a "meter". It's a "Peak to Peak Comparison Meter",
whatever that means.
What's inside:
http://i.ebayimg.com/images/a/%28KGrHqN,!ikFCd%28btD-8BQ8wKmgb-!~~/s-l1600.jpg
I couldn't find a manual or schematic. I have only some bad guesses
as to what it does and how it works. At least you didn't pay any
money for it.
On 2016-01-11, Ivan Vegvary <ivanvegvary@gmail.com> wrote:
"Peak-to-Peak" meter.
For what are (were) they used? Got it for free.
Is it simply so I don't have to multiply by 1.414?
Be gentle. I'm new at all this and trying to learn.
Ivan Vegvary
To be useful, the p-2-p meter should sample and hold the top and bottom
values, and not simply measure RMS and multiply. If we measure p-2-p
with a scope we get a stable trace, and then actually find the highest
and lowest voltages.
Note that the 1.414 factor between RMS and peak voltage only applies to
a sinusoidal signal!
It is incorrect for other signal shapes.
For instance, a square wave's RMS is the same as peak.
(Peak-to-peak is twice peak, so the factors double: p-2-p/RMS is 2.828 for
sinusoidal, 2 for square.)
No , it is soldered to a terminal strip tab that is embeddeded inOn 01/10/2016 7:56 PM, Jeff Liebermann wrote:
On Sun, 10 Jan 2016 19:38:00 -0800 (PST), Ivan Vegvary
ivanvegvary@gmail.com> wrote:
"Peak-to-Peak" meter.
For what are (were) they used? Got it for free.
Is it simply so I don't have to multiply by 1.414?
Be gentle. I'm new at all this and trying to learn.
Ivan Vegvary
Like this Senco PP2 ?
http://www.ebay.com/itm/151944955761
http://www.ebay.com/itm/300846516496
It's not really a "meter". It's a "Peak to Peak Comparison Meter",
whatever that means.
What's inside:
http://i.ebayimg.com/images/a/%28KGrHqN,!ikFCd%28btD-8BQ8wKmgb-!~~/s-l1600.jpg
I couldn't find a manual or schematic. I have only some bad guesses
as to what it does and how it works. At least you didn't pay any
money for it.
I think it is a curve tracer of some sort.
Is that a line cord soldered to the metal can of the potentiometer?
Nasty.
Is the line cord polarized?
Did the Senco company get sued out of business by the widows?
John ;-#)#
On Mon, 11 Jan 2016 13:37:49 -0800, John Robertson <spam@flippers.com
wrote:
On 01/10/2016 7:56 PM, Jeff Liebermann wrote:
On Sun, 10 Jan 2016 19:38:00 -0800 (PST), Ivan Vegvary
ivanvegvary@gmail.com> wrote:
"Peak-to-Peak" meter.
For what are (were) they used? Got it for free.
Is it simply so I don't have to multiply by 1.414?
Be gentle. I'm new at all this and trying to learn.
Ivan Vegvary
Like this Senco PP2 ?
http://www.ebay.com/itm/151944955761
http://www.ebay.com/itm/300846516496
It's not really a "meter". It's a "Peak to Peak Comparison Meter",
whatever that means.
What's inside:
http://i.ebayimg.com/images/a/%28KGrHqN,!ikFCd%28btD-8BQ8wKmgb-!~~/s-l1600.jpg
I couldn't find a manual or schematic. I have only some bad guesses
as to what it does and how it works. At least you didn't pay any
money for it.
I think it is a curve tracer of some sort.
Is that a line cord soldered to the metal can of the potentiometer?
Nasty.
Is the line cord polarized?
Did the Senco company get sued out of business by the widows?
John ;-#)#
No , it is soldered to a terminal strip tab that is embeddeded in
phenolic resin paper. The tab that is soldered to the potentiometer
case is also connected to the phenolic strip. There is electrical
isolation between the two tabs. It was a very common c practice in
the 1960s.
On Monday, January 11, 2016 at 12:34:11 PM UTC-5, Kaz Kylheku wrote:
On 2016-01-11, Ivan Vegvary <ivanvegvary@gmail.com> wrote:
"Peak-to-Peak" meter.
For what are (were) they used? Got it for free.
Is it simply so I don't have to multiply by 1.414?
Be gentle. I'm new at all this and trying to learn.
Ivan Vegvary
To be useful, the p-2-p meter should sample and hold the top and bottom
values, and not simply measure RMS and multiply. If we measure p-2-p
with a scope we get a stable trace, and then actually find the highest
and lowest voltages.
Note that the 1.414 factor between RMS and peak voltage only applies to
a sinusoidal signal!
It is incorrect for other signal shapes.
For instance, a square wave's RMS is the same as peak.
(Peak-to-peak is twice peak, so the factors double: p-2-p/RMS is 2.828 for
sinusoidal, 2 for square.)
I have a current probe , hall effect , that claims to be true RMS.
When looking at the fine print it says it is true RMS providing it is
a sine wave??
If it is a sine wave then who needs a RMS mater.
This is
somewhat like a USB powered speakers for a computer claiming 100 watts
of power. That would be 20 amps at 5 volts , extremely unlikely. In
"Peak-to-Peak" meter.
For what are (were) they used? Got it for free.
Is it simply so I don't have to multiply by 1.414?
Ivan Vegvary wrote:
"Peak-to-Peak" meter.
For what are (were) they used? Got it for free.
Is it simply so I don't have to multiply by 1.414?
** A clue is the graphic on the front of the unit - it shows a typical sweep waveform from a TV set. TV service manuals are often full of such diagrams, accompanied by p-p voltage values.
http://www.boxcarcabin.com/PhilcoPredictaSchematicBoth.jpg
A service tech might need to measure the ones he finds in a set, but has not got a calibrated scope - just a basic CRT based waveform monitor.
So he uses the Senco to produce a 60Hz sine wave with the same p-p height on the screen of his monitor - then measures that with a regular multimeter and multiplies the result by 2.82.
A similar trick can be used when calibrating the vertical display of a scope using just a DC source and a DMM. Set the scope to DC coupled and apply a voltage to the input while monitoring same on the DMM.
Most DMMs have better than 1% accuracy on DC volts so you simply adjust the scope's internal cal trimmer to match the full scale deflection ( usually 8 divs ) on the screen.
Square waves can then be used to check the scope's vertical response for flatness.
.... Phil
On 2016-01-12, John Heath <heathjohn2@gmail.com> wrote:
On Monday, January 11, 2016 at 12:34:11 PM UTC-5, Kaz Kylheku wrote:
On 2016-01-11, Ivan Vegvary <ivanvegvary@gmail.com> wrote:
"Peak-to-Peak" meter.
For what are (were) they used? Got it for free.
Is it simply so I don't have to multiply by 1.414?
Be gentle. I'm new at all this and trying to learn.
Ivan Vegvary
To be useful, the p-2-p meter should sample and hold the top and bottom
values, and not simply measure RMS and multiply. If we measure p-2-p
with a scope we get a stable trace, and then actually find the highest
and lowest voltages.
Note that the 1.414 factor between RMS and peak voltage only applies to
a sinusoidal signal!
It is incorrect for other signal shapes.
For instance, a square wave's RMS is the same as peak.
(Peak-to-peak is twice peak, so the factors double: p-2-p/RMS is 2.828 for
sinusoidal, 2 for square.)
I have a current probe , hall effect , that claims to be true RMS.
When looking at the fine print it says it is true RMS providing it is
a sine wave??
If it is a sine wave then who needs a RMS mater.
Someone who only has a DC meter, and wants to measure AC.
In many situations we know we have a sine waves; we just want to know
how big, as an RMS figure.
For instance, I can stick my here handy multimeter into the wall,
configured for AC, and it tells me that the line voltage is 118.7.
That's an RMS (predicated on it being sinusoidal), and it is useful.
If it is true RMS, and accurate, then I know that the peak voltage
is 1.414 times that, or 167.9, and peak-to-peak is twice that.
This is
somewhat like a USB powered speakers for a computer claiming 100 watts
of power. That would be 20 amps at 5 volts , extremely unlikely. In
But there isn't any condition under which the speakers can continuously
deliver that much power without a source other than the USB port; no USB
host chip provides that much current. Thus it is unconditionally a lie.
the old days they would not lie like this just to make a sale.
Oh, if we pull out some old Popular Mechanics issues from, say, the
1940's, we will see all sort sof snake oil.
Did the Senco company get sued out of business by the widows?