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Table 3. TB
err
PXI Express Hardware Specification
Revision 1.0
PXIe-1085 Chassis PXIe-6674T Override
100 µ (100 ppm)
25 µ (25 ppm)
80 n (80 ppb)
Example 1: Calculating Error with a PXIe-1085 Chassis
Calculate the error of performing a frequency measurement of a 10 MHz clock (100 ns
period) with a 1 ms measurement time using the PXIe-Clk100 provided by the PXIe-1085
chassis as the timebase.
Solution
25µ
1 − 25µ
+
20��
1�� − 100��
* 1, 000, 000
= 45���
Example 2: Calculating Error when Overriding with the PXIe-6674T
Calculate the error if you override the PXIe-Clk100 timebase with the PXIe-6674T and
increase the measurement time to 10 ms.
Solution
80�
1 − 80�
+
20��
10�� − 100��
* 1, 000, 000
= 2���
Calibration Interval
Recommended calibration interval
1 year
PXIe-6570 Specifications
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© National Instruments
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