Subject:
|
Re: Motors & handyboard
|
Newsgroups:
|
lugnet.robotics.handyboard
|
Date:
|
Sat, 15 Feb 1997 07:40:48 GMT
|
Original-From:
|
Adam <adam@ring.zenox.&AvoidSpam&com>
|
Viewed:
|
1160 times
|
| |
|
|
To measure current with an multimeter or ammeter (volt/ohm/etc.. meter)
you must break the circuit at some point and put the meter
in series with the circuit thus gapping the break.
ie)
+-----(+) METER (-)------+
| |
| |
(+) |
POWER |
(-) |
| |
| |
+---------\/\/\/---------+
POWER = some source of power (battery, etc.)
METER = obvious (but, switched to measure current)
\/\/\/= circuit represented by is resistive nature
WARNING: damage to the meter may occur if you do not
hook the meter according to the instructions provided
CAUTION: check the polarity twice, and set the meter
to its highest measurement of current (usually 10A)
If you think the current is beyond this setting.
DO NOT MEASURE IT! You require a better meter.
If the meter shows no reading at its highest range of
measurement, (note: circuit will also be disfunctional)
then bring it down a notch (usually 33-320mA)
----------------------------------------------------------
Adam B. Cox check out my web page
Computer Engineer http://www.zenox.com/~adam
Zenox Communications Corp. vmail: 416-241-7000 (x224)
----------------------------------------------------------
On Fri, 14 Feb 1997, MAR ERICSON wrote:
>
> > Yesterday I tried to run a motor out of the HB. First I tried how much =
> > current it needed with a multimeter and a 5V power source ... The result =
> > 75mA.=20
>
>
> EE Question:
>
> How do you use a multimeter to measure the current?
> I was told that you need a current probe to do this kind of thing.
>
> ??
>
>
|
|
Message has 1 Reply:
 | | Re: Motors & handyboard
|
| (...) What is 20? (...) Current meters have an internal resistance. The lower the current range the larger the resistance --- even with digital current meters. Some typical values For example: Digital Analogue Current Range R_meter R_meter 200 uA (...) (27 years ago, 17-Feb-97, to lugnet.robotics.handyboard)
|
Message is in Reply To:
11 Messages in This Thread:
 
 
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
This Message and its Replies on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
