Hello All,
We are having an issue, not sure what can be done. We have the following hardware that was just purchased.
1. NI cDAQ-9188XT CompactDAQ Chassis (8-Slot Industrial Ethernet)
2. -±80 mV Thermocouple Input, 14 S/s, 4 Ch Module
3. NI 9206 ±200 mV to ±10 V, Analog Input, 250 kS/s, 32 Ch Module
4. NI PS-15 Power Supply, 24 VDC, 5 A, 100-120/200-240 VAC Input
The intent is that we need to measure a series string of 12 battery voltages which are each 4.2V (50V max). However, this this 12 cells is just really the minimum, with the possiblity of doing upto maybe 150V max rather than 50V
The thought was that the channels are differential and we could use this system to do differntial measurements across each 4.2V cell as the individual cell voltage is all we are intersted in. However, we are now confused as someone has pointed out that the datasheet says there is no channel to channel isolation, the 600V isolation is only across the 'mains'. So I am guessing this will no lnoger work.
Anyone have any thoughts on what we can do to get running?
We have the entire system programmed and running on a test system input (ie function generator) so Im hoping to not lose any time invested in programming.
1. is there is a new product that has the channel to channel isolation?
2. is there a way to maybe do a voltage divider down to the 30V level, which is possible, but not ideal.
3. A way to reference measurments ground to lower potential outside of a voltage divider
4. Do we even need the channel to channel isolation anyway?
thanks
Jim