Maker Pro
Maker Pro

Current leak

S

Spehro Pefhany

Jan 1, 1970
0
This is a pic of my multimeter.

http://i1289.photobucket.com/albums/b516/drew77580/DSC_0016_zpsf0b5266a.jpg

I am trying to measure current drain.

I hooked up meter between the positive of the device, but not sure if it's right.

I was wondering what the Red Output port is used for ?

Thanks.


http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Sanwa/YX-360TR.PDF

http://ronelex.com/images/uploads/2012/12/YX-360TRSCHEMATICa-500x394.jpg

As you can see, the AC voltage settings will not block any DC that is
present. The "Output" input has a series capacitor.


Best regards,
Spehro Pefhany
 
M

Maynard A. Philbrook Jr.

Jan 1, 1970
0
This is a pic of my multimeter.

http://i1289.photobucket.com/albums/b516/drew77580/DSC_0016_zpsf0b5266a.jpg

I am trying to measure current drain.

I hooked up meter between the positive of the device, but not sure if it's right.

I was wondering what the Red Output port is used for ?

Thanks.

THey are trying to get you to buy another meter? :)

But really, the idea is for you to be able to measure
DC with one meter and then set another meter beside it and
connect the output to the input of the next meter along with
the common and measure the AC ripple on that DC offset at the
same time.

Years ago I had one that would do this for you but it was scaled. The
output was connected to a divider in the meter so that it would only
generate a low level like 1 Volt at full scale. There was a knob on
there so you could correct the DC reading on the meter when you
connected the load. The idea was to first measure something with nothing
attached to the output, get a mark on the meter, then connect the next
measuring device on the output and adjust the knob to bring it back to
the correct value on the meter.

Mine had a switch on it to select DC or AC coupled output. I used to
use it for doing current measurements and watch ripples via the scope
but
you can also use it to watch via the scope anything the meter sends to
the analog gage.

Things have changed over the years!

Jamie
 
M

Maynard A. Philbrook Jr.

Jan 1, 1970
0
http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Sanwa/YX-360TR.PDF

http://ronelex.com/images/uploads/2012/12/YX-360TRSCHEMATICa-500x394.jpg

As you can see, the AC voltage settings will not block any DC that is
present. The "Output" input has a series capacitor.


Best regards,
Spehro Pefhany

Strange. My old unit output jack connected to a fix divider and you were
required to use the load correction knob. This used to drive me crazy
because at times when I wasn't using this I'd forget to put the knob
back in the zero/off position. So I modified the meter with an insulated
spring switch behind the jack to disable this feature when the plug
wasn't in place.

A little dremel work and some glue go a long ways.

Jamie
 
A

Andy K

Jan 1, 1970
0
[email protected] says...







Strange. My old unit output jack connected to a fix divider and you were

required to use the load correction knob. This used to drive me crazy

because at times when I wasn't using this I'd forget to put the knob

back in the zero/off position. So I modified the meter with an insulated

spring switch behind the jack to disable this feature when the plug

wasn't in place.



A little dremel work and some glue go a long ways.



Jamie

Multi answers to one question. ??

No, I won't buy another meter. :)
 
This is a pic of my multimeter.



http://i1289.photobucket.com/albums/b516/drew77580/DSC_0016_zpsf0b5266a.jpg



I am trying to measure current drain.



I hooked up meter between the positive of the device, but not sure if it's right.



I was wondering what the Red Output port is used for ?



Thanks.

That meter max's out at 0.25A, that's a pretty small current, better do a reality check before you hook it up. The OUTPUT jack is where you plug the "OUTPUT" of an audio circuit whose AC amplitude you want to measure, and setthe scale to ACV, COM goes to the circuit common.
 
R

Robert Baer

Jan 1, 1970
0
Andy said:
This is a pic of my multimeter.

http://i1289.photobucket.com/albums/b516/drew77580/DSC_0016_zpsf0b5266a.jpg

I am trying to measure current drain.

I hooked up meter between the positive of the device, but not sure if it's right.

I was wondering what the Red Output port is used for ?

Thanks.
For currents in the ranges indicated by the switch,use the black
COMMON and the current connector; IGNORE the "output" connector.
For currents much lower than those switch ranges,use voltage settings
and look up (from the manual) the meter resistance for the range being used.
A 10Meg handheld DVM can give full-scale sensitivity of 20nA on the
200mV scale.
Naturally,if you use this trick, you should know what that extra
10Megs in series may do to the circuit operation.
 
For currents in the ranges indicated by the switch,use the black

COMMON and the current connector; IGNORE the "output" connector.

For currents much lower than those switch ranges,use voltage settings

and look up (from the manual) the meter resistance for the range being used.

A 10Meg handheld DVM can give full-scale sensitivity of 20nA on the

200mV scale.

Naturally,if you use this trick, you should know what that extra

10Megs in series may do to the circuit operation.

This thing is a 50uA FS meter, whatever the scale, and that's DC. AC is variable because they shunt the coil with a capacitor. Dunno why they confuse the issue with that 20kOhm/Volt crap.
 
R

Robert Baer

Jan 1, 1970
0
This thing is a 50uA FS meter, whatever the scale, and that's DC. AC is variable because they shunt the coil with a capacitor. Dunno why they confuse the issue with that 20kOhm/Volt crap.

You should learn about meters, how they are made,their schematics,
uses and limitations.

A VOM,IF it has any capacitors at all,has only _ONE_.
20Kohm/Volt is mathematically derived from the meter resistance of 50uA.
Use Ohm's law equation in standard form: voltage E expressed in Volts
equals current I expressed in Amperes times resistance R expressed in
Ohms. All else is simple mathematics. Always keep the UNITS.
 
R

Robert Baer

Jan 1, 1970
0
This thing is a 50uA FS meter, whatever the scale, and that's DC. AC is variable because they shunt the coil with a capacitor. Dunno why they confuse the issue with that 20kOhm/Volt crap.
You should learn about meters, how they are made,their schematics,
uses and limitations.

A VOM,IF it has any capacitors at all,has only _ONE_.
20Kohm/Volt is mathematically derived from the meter resistance of 50uA.
Use Ohm's law equation in standard form: voltage E expressed in Volts
equals current I expressed in Amperes times resistance R expressed in
Ohms. All else is simple mathematics. Always keep the UNITS.
 
A VOM,IF it has any capacitors at all,has only _ONE_.

This one has ONE, see SP's post with link to schematic.
20Kohm/Volt is mathematically derived from the meter resistance of 50uA.

Use Ohm's law equation in standard form: voltage E expressed in Volts

equals current I expressed in Amperes times resistance R expressed in

Ohms. All else is simple mathematics. Always keep the UNITS.

Really now, care to explain how you use the ohms/volt for anything? And your equation is pedantic. Ohms/Volt is Amperes^-1,(inverse amps?) but that's apparently too confusing for some people. Then inverse (50uA)^-1 is 20kOhm/Volt. For DC measurements, the meter loads the circuit with full scale DCV /50uA Ohms.
 
R

Robert Baer

Jan 1, 1970
0
This one has ONE, see SP's post with link to schematic.


Really now, care to explain how you use the ohms/volt for anything? And your equation is pedantic. Ohms/Volt is Amperes^-1,(inverse amps?) but that's apparently too confusing for some people. Then inverse (50uA)^-1 is 20kOhm/Volt. For DC measurements, the meter loads the circuit with full scale DCV /50uA Ohms.
Note that VOMs, IF they have one capacitor it is NEVER "across" the meter.
 
A

Andy K

Jan 1, 1970
0
Note that VOMs, IF they have one capacitor it is NEVER "across" the meter.

My multi meter has at least two caps along with a .5 amp fuse and spare.

It's seems to me that the switch that I have does not fully open the circuit like it should.

Because if one leg of power is broken, there can be no current leakage.

It has switch positions on both sides of the OFF position for chime mode and alarm mode.

Andy
 
Note that VOMs, IF they have one capacitor it is NEVER "across" the meter.

You mean the meter movement, but this one most certainly does. Why do you think the ohms per volt for ACV is on the order of half its spec for DCV?
 
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