Can this meter be used to measure V/A from a 2V supply by using an independent 5V power supply just to power the meter? Confused about common ground.
66953
YesVoltage side, red wire to +5Vdc supply and black to 5V negative side.meter will read 5.0VdcThen On the current side, red wire to +2Vdc, and load + side.and load negative side to yellow wire.Black wire to 2V negative side. now the meter will read 2V load current.
66954
Not sure I use if for a solar power pack. Measure voltage of battery and the draw from the battery
66955
no this unit will not work for that. the one that i had was no good,and i returned it. tj
2218238
Yes, this is a voltmeter, so it will read whatever the voltage is at the time, it doesn't have any memory capability.
1713086
i am not sure what you are useing this device for, but in my application the end with two connector is for the two input voltages. the output of the two is the single connector
322393
I doubt it very much. The meter requires power from the USB charge port. If you removed the power from the charge port to see if there is a discharge, the meter would not be powered. Your best option would be to modify a USB cable and connect in a milli-ammeter
685904
I just used a 12v adapter I had lying around. I cut the end off and used a multimeter to make sure the polarity was correct and hooked it to the board. Please, do be careful about the where you put the positive and negative. I remember reading on the net that this device won't protect itself from reverse polarity on the dc voltage. Meaning, the circuit board will be ruined.
1661315
Negative, yet there is an input receptacle with NO SPECS as to polarity and voltage needed, as well a missing current spec needed when multiple items are connected. Closer inspection of item shows no specs ON the item either, but it appears that an area below the receptacle has been sanded off, as if the specs were removed, as was the model info. Weird.. Inspection was done with lighted magnifier I used at NASA to inspect pins. sort of like owning a 7-stall barn that will only hold 4 horses at best ;-)
147611
This Power Supply can be used as a meter but is not very accurate and is not advised because it has a limit of 30 volts. The display shows amps and volts together.
1818974
No you can measure voltage and current and it is a true rms meter but you cant measure both at the same time.
1633573
Yes, set the scale for DC range, and place the two probes using the correct polarity so the meter reading is a plus (+) reading. If the batteries are under load when doing this, the voltage may be less than 24vdc. If the two batteries are not connected to the trolling motor, the reading could be 24vdc, otherwise, if near zero or substantially less than 24vdc, the batteries are either bad, shorted, etc. or need recharged. Also check each battery separately.
634091
Maybe this will help I hook it up to a 1993 chevy truck I hook the voltage wire right to a ignition wire 12 volts in accessory and 12 volts with key on the same wire test with a test light to find the right wire. the voltage measures my battery voltage and when running my charging voltage no problems. I bought the three in one meter voltage temperature and time you can isolate each one or have them all read showing individual readings intermediately so yes it's can read its own power but it is powered by your cars battery I hope this helps you. Ps I'm a auto tech for 37 years now. I Had some problems with the temperature sensor probe but they sent me a new one seems to work okay now. Just so you know it comes in 1 gage not 3 that's just showing you what the gage dose.
1419464
i don't think that will work as you would be measuring micro voltage , you may need a galvanometer
1552178
Sorry Calvin, I think this a great meter, however, I only use it to check the voltage on my AA and AAA batteries and rechargeable batteries from Amazon..... Works Great ! Phil Pauls Valley, Oklahoma
1496660
I bought the meter to judge the level of lead-acid batteries, but since it is just a voltage meter, I'm not sure it would make any difference.
1900452
No. This is a fine meter which is more at home in the power distribution area than in the audio and RF signal strength area. Its lowest voltage scales are designed for 1 to 400V for both AC and DC. It's a good meter for its intended use which does not include micro and millivolt volt measurements. Input impedance circuits in meters like this are too low to measure millivolt size signals,
1443103
This is a frequently asked question. The voltage was apparent, however the amperes was guess work and I got the 50%-50% choice wrong. I emailed the seller and they replaced it no charge so I used the other wire. The meter has worked flawlessly for several months.
1313451
All I have is a hand held meter with a needle. It displays 2.1 amps on start up. I am using an Active Air variable speed controller with mine. http://www.amazon.com/gp/product/B003URBQ1M/ref=wms_ohs_product?ie=UTF8&psc=1
583129
For my application I just used a power supply set to 5v, but VBUS will power it just fine as one of my coworkers did with the same amp.