Hi All,

I am trying to monitor 10 difference voltages on 10 devices. I am looking for device or a way to monitor all 10 voltages simultaneously. Any help or suggestions would be greatly appreciated

Voltage Range: 0V-16VDC.

Thanks,

WJ

 

What device will be measuring (monitoring) the voltages?

Do these 10 devices share a common ground?

 

What device will be measuring (monitoring) the voltages?

Do these 10 devices share a common ground?

The 10 devices don't share a common ground, but I can accommodate it.

 

hi j103,
What, if any, tolerance on the 'instantaneous' period?

E

Update:
Reason for asking, two of these low-cost Arduino Nano's each have 8 ADC inputs.
E

 

I’ve used the MCP3008 10 bit 8 channel A/D converter with SPI interface. Not sure how you can get around not having a common ground.

 

If you are looking for a plug and play instrument, Keysight has a data acquisition system that will do exactly what you require.

 

Keysight has a data acquisition system that will do exactly what you require.

There are many data acquisition systems out there. Mine plugs into USB port.

 

How (physically) far apart are these voltages?
What exactly do you need to measure? what level of resolution + precision do you need?
How quickly should the system respond? (measurement bandwidth)

...all important factors for getting a decent answer.

 

If the built-in Arduino ADCs aren't good enough, there's ADC modules with more bits and multiple inputs. ADS1115 for example.

 

What are you monitoring??Voltage present above some value?? Or voltage at the correct level within some tolerance?? How accurate does it need to be??
What signal is needed if a voltage is out of specification??
And what sort of response time is required.?
A monitor system could consist of three LM339 Conparators, with the output going low if any voltage was below the setting. OR it could be a lot more complex.

 

What are you monitoring??Voltage present above some value?? Or voltage at the correct level within some tolerance?? How accurate does it need to be??
What signal is needed if a voltage is out of specification??
And what sort of response time is required.?
A monitor system could consist of three LM339 Conparators, with the output going low if any voltage was below the setting. OR it could be a lot more complex.

Hi MisterBill2,

Thank you for reply. What I trying monitor is 10 difference battery packs for a fully charge pack is 12.6V and discharge pack is 8V and I wanted to monitor the voltages when the packs are charging/discharging.

For Charging
8V --> 12.6V

For Discharging

12.6V ---> 8V

Thanks
WJ

 

Why not get 10 of these voltmeters or similar?
Meter

 

I am trying to monitor 10 difference voltages on 10 devices. I am looking for device or a way to monitor all 10 voltages simultaneously. Any help or suggestions would be greatly appreciated

Hi justin,
You did state simultaneously, why is that important when measuring 10 different batteries?

E

 

OK, so above 12.6 or below 8 volts.
Comparators would be the way to do a YES/NO monitor, but if the need is to read actualvoltages then it gets a bit more complex. The simple way is a single input A/D differential input device and a multi-point multiplexer. You can easily get 30 readings a minute on each battery, and know that they are all scaled the same. And every reading will be isolated from the others so you could have ten different chargers if needed. The multiplexers would be CD4053 types, I believe, with a bit of digital addressing required.

 

Why not get 10 of these voltmeters or similar?
Meter

The goal is to capture the instruments variability for both charging/discharging.

 

Hi justin,
You did state simultaneously, why is that important when measuring 10 different batteries?

E

The goal is to capture the instruments variability for both charging/discharging. There is a charging time criteria (<=5hrs) and assumed that the time will vary instrument by instrument.

 

A multiplexed system could take a reading of each battery every ten seconds, or probably every second. Would that be close enough to constant monitoring?? The added advantage would be that the readings would be isolated from common and everything else, except that station's charge/discharge circuit. It would use a dual channel multiplexer system, and a differential input A/D converter. PLUS only one A/D so it could be 12 or even 16 bits, if that is any benefit. The down side is it would take two wires connected to each battery. Probably that is not a big deal. The multiplexing could also be done with ten DPST relays. Actually, you could use a digital meter tat has a digital output, either binary or BCD, and a indicator to tell which battery was connected.