National Instruments PXIe-6570

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 | © National Instruments | 13