Re: Underpower USB port.

[Ext User(Clockmeister)]

"Rod Speed" <rod_speed@yahoo.com> wrote in message
news:40j4q1F1b0bhaU1@individual.net...
> Wayne <4bu53@h0tm417.c0m> wrote:
>
>> Out of four USB ports, one appears to be underpowered. I have an
>> external USB drive that is bus powered, however it only works in three of
>> the four ports.
>
>> Is there a way of testing the ports to check their current/flow?
>
> You can do that with a multimeter, basically measure the
> 5V on the USB connector with that high load plugged in.

Rubbish, that will measure voltage but in no way indicates if the port can
supply enough current for the device.

[Ext User(FruitLoop)]

"Clockmeister" <no-one@nowhere.com> wrote in message
news:43a48669$1@duster.adelaide.on.net...
>
> "Rod Speed" <rod_speed@yahoo.com> wrote in message
> news:40j4q1F1b0bhaU1@individual.net...
> > Wayne <4bu53@h0tm417.c0m> wrote:
> >
> >> Out of four USB ports, one appears to be underpowered. I have an
> >> external USB drive that is bus powered, however it only works in three
of
> >> the four ports.
> >
> >> Is there a way of testing the ports to check their current/flow?
> >
> > You can do that with a multimeter, basically measure the
> > 5V on the USB connector with that high load plugged in.
>
> Rubbish, that will measure voltage but in no way indicates if the port can
> supply enough current for the device.

Yep , its another RS shit idea .

As mentioned 500ma per port is the norm however , in my experience a 3.5 usb
hard drive can be flakey sometimes .

I would not worry too much about it if 3 out of 4 ports work .

Also an external powered USB hub can help

>
>
>
>
>

[Ext User(Wayne)]

Clockmeister wrote:
> "Rod Speed" <rod_speed@yahoo.com> wrote in message
> news:40j4q1F1b0bhaU1@individual.net...
>
>>Wayne <4bu53@h0tm417.c0m> wrote:
>>
>>
>>>Out of four USB ports, one appears to be underpowered. I have an
>>>external USB drive that is bus powered, however it only works in three of
>>>the four ports.
>>
>>>Is there a way of testing the ports to check their current/flow?
>>
>>You can do that with a multimeter, basically measure the
>>5V on the USB connector with that high load plugged in.
>
>
> Rubbish, that will measure voltage but in no way indicates if the port can
> supply enough current for the device.
>

Actually, and I do appreciate your input do not get me wrong there, a
multimeter will read the current as it combines an ammeter (current),
voltmeter (voltage) and ohmmeter (resistance) into one unit.

[Ext User(--user--)]

"Clockmeister" <no-one@nowhere.com> wrote in message
news:43a48669$1@duster.adelaide.on.net...
>
> "Rod Speed" <rod_speed@yahoo.com> wrote in message
> news:40j4q1F1b0bhaU1@individual.net...
>> Wayne <4bu53@h0tm417.c0m> wrote:
>>
>>> Out of four USB ports, one appears to be underpowered. I have an
>>> external USB drive that is bus powered, however it only works in three
>>> of the four ports.
>>
>>> Is there a way of testing the ports to check their current/flow?
>>
>> You can do that with a multimeter, basically measure the
>> 5V on the USB connector with that high load plugged in.
>
> Rubbish, that will measure voltage but in no way indicates if the port can
> supply enough current for the device.

Nope. Rod's right. With the load connected, measure the voltage. If it's
below 5V then it's not supplying the current it should.

[Ext User(Clockmeister)]

"Wayne" <4bu53@h0tm417.c0m> wrote in message
news:43a49df2$0$15752$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
> Clockmeister wrote:
>> "Rod Speed" <rod_speed@yahoo.com> wrote in message
>> news:40j4q1F1b0bhaU1@individual.net...
>>
>>>Wayne <4bu53@h0tm417.c0m> wrote:
>>>
>>>
>>>>Out of four USB ports, one appears to be underpowered. I have an
>>>>external USB drive that is bus powered, however it only works in three
>>>>of the four ports.
>>>
>>>>Is there a way of testing the ports to check their current/flow?
>>>
>>>You can do that with a multimeter, basically measure the
>>>5V on the USB connector with that high load plugged in.
>>
>>
>> Rubbish, that will measure voltage but in no way indicates if the port
>> can supply enough current for the device.
>>
>
> Actually, and I do appreciate your input do not get me wrong there, a
> multimeter will read the current as it combines an ammeter (current),
> voltmeter (voltage) and ohmmeter (resistance) into one unit.

It only reads current in series with the load, voltage is measured at the
port.

Volts and Amps are measured using the same tool, but not in the same manner.

[Ext User(Clockmeister)]

"--user--" <bgates@microsoft.con> wrote in message
news:43a49f7c$0$21121$afc38c87@news.optusnet.com.a u...
>
> "Clockmeister" <no-one@nowhere.com> wrote in message
> news:43a48669$1@duster.adelaide.on.net...
>>
>> "Rod Speed" <rod_speed@yahoo.com> wrote in message
>> news:40j4q1F1b0bhaU1@individual.net...
>>> Wayne <4bu53@h0tm417.c0m> wrote:
>>>
>>>> Out of four USB ports, one appears to be underpowered. I have an
>>>> external USB drive that is bus powered, however it only works in three
>>>> of the four ports.
>>>
>>>> Is there a way of testing the ports to check their current/flow?
>>>
>>> You can do that with a multimeter, basically measure the
>>> 5V on the USB connector with that high load plugged in.
>>
>> Rubbish, that will measure voltage but in no way indicates if the port
>> can supply enough current for the device.
>
> Nope. Rod's right. With the load connected, measure the voltage. If it's
> below 5V then it's not supplying the current it should.

Nope, current is measured in amps and measured differently, in series with
the load.

The voltage can still read 5V but not supply enough current to operate the
device.

[Ext User(Rod Speed)]

Clockmeister <no-one@nowhere.com> wrote
> Rod Speed <rod_speed@yahoo.com> wrote
>> Wayne <4bu53@h0tm417.c0m> wrote

>>> Out of four USB ports, one appears to be underpowered. I have an external
>>> USB drive that is bus powered, however it only works in three of the four
>>> ports.

>>> Is there a way of testing the ports to check their current/flow?

>> You can do that with a multimeter, basically measure the
>> 5V on the USB connector with that high load plugged in.

> Rubbish, that will measure voltage but in no way indicates if the port can
> supply enough current for the device.

Thanks for that completely superfluous proof that
you have never ever had a fucking clue. If it cant
provide enough current, the voltage will sag, fuckwit.

[Ext User(Rod Speed)]

Clockmeister <no-one@nowhere.com> wrote:
> "--user--" <bgates@microsoft.con> wrote in message
> news:43a49f7c$0$21121$afc38c87@news.optusnet.com.a u...
>>
>> "Clockmeister" <no-one@nowhere.com> wrote in message
>> news:43a48669$1@duster.adelaide.on.net...
>>>
>>> "Rod Speed" <rod_speed@yahoo.com> wrote in message
>>> news:40j4q1F1b0bhaU1@individual.net...
>>>> Wayne <4bu53@h0tm417.c0m> wrote:
>>>>
>>>>> Out of four USB ports, one appears to be underpowered. I have an
>>>>> external USB drive that is bus powered, however it only works in
>>>>> three of the four ports.
>>>>
>>>>> Is there a way of testing the ports to check their current/flow?
>>>>
>>>> You can do that with a multimeter, basically measure the
>>>> 5V on the USB connector with that high load plugged in.
>>>
>>> Rubbish, that will measure voltage but in no way indicates if the
>>> port can supply enough current for the device.

>> Nope. Rod's right. With the load connected, measure the voltage. If it's
>> below 5V then it's not supplying the current it should.

> Nope,

Yep.

> current is measured in amps and measured differently, in series with the load.

I didnt say anything about measuring the current,
thats a bit fiddly to do without molesting a USB cable.

> The voltage can still read 5V but not supply enough current to operate the
> device.

Thanks for that completely superfluous proof
that you have never ever had a fucking clue.

If the port cant deliver the current that the device
requires, that results in a drop in that voltage at
the USB port, and that will be the reason the device
doesnt work on that port, it isnt getting enough voltage.

It could also just be a port that isnt configured properly
and nothing to do with the current the device uses.
Measuring the 5V at the port with the device plugged
in will tell you if the port can supply the current the
device takes without sagging.