SC5 Signal Conversion Performance Measurements
58
Analog outputs DC performance measurements
DNL and INL
The differential (DNL) and integral nonlinearities are measured with the SC5 connected directly to a National
Instruments 4071 PXI digital multimeter operated in DMM mode (7.5 digits). During these measurements the
environment temperature was not kept constant, meaning that in a constant-temperature environment the results for
the INL would show a lower INL than in themeasurement below. The following settings have been used for the
measurement:
DMM
Measured output: AO1 Mode of operation: DMM, DC volts
Range: 10 V
Resolution: 26 bit
The first plot shows the differential nonlinearity, the second the integral nonlinearity. In both cases the error is below
±1 LSB at 20 bit, meaning below ±20 µV absolute voltage error. The SC5 achieves therefore ppm-precision on its
analog outputs.
Figure 38: Differential nonlinearity of the analog outputs. The dashed lines indicate the ±1 LSB range.
−10 −8 −6 −4 −2
0 2 4 6 8 10
Output voltage [V]
DNL [20-bit LSB]
1.5
1
0.5
0
-0.5
-1
-1.5
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