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PXIe-6570 Force/Measure Current Accuracy Computation

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Hi,

 

I am having problems on understanding the computation for PXIe-6570 Force/Measure Current Accuracy.

What comes next after finding the zone (step 6)?

Can anyone give me an example of the computation?

 

Thanks!

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Solution
Accepted by PatriciaM

Let me show you an example for calculating accuracy,

 

Steps

  1. FI = 1.5mA
  2. Using 2mA as the best range
  3. % Force current range = (1.5m / 2m)*100 = +75%
  4. Assume my impedance is 1k Ohm, Voltage Required = 1k * 1.5m = 1.5V
  5. Plotting the 1.5V, +75% in the Figure3, the point lies in the grey area which is designated as zone 1
  6. Looking at Table1, it states that +-1% for Zone1 irrespective of range
  7. Though not explicitly stated, you calculate the accuracy as you typically do for any measurement or value in engineering, apply +-1% to +-2mA range, now it becomes +-40uA because +-2mA constitutes 4mA total range.

Hope step 7 clarifies your question about how to apply +-1% to get the accuracy number.

 

Alternatively, if my impedance was 100 ohm and force current was -1.5mA, the voltage required becomes 150mV. Now, the 150mV, -75% lies outside zone1 in the graph and hence there is no warranted accuracy specification (as mentioned in step5)

-Santhosh
Semiconductor Validation & Production Test
Soliton Technologies
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It makes so much more sense now.

Thank you!

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