PXIe-5160/5162 Self-Calibration
To eliminate errors caused by changing temperatures, NI-SCOPE provides a highly repeatable
self-calibration function.
For the PXIe-5160/5162, self-calibration yields the following benefits:
•
Corrects for DC gain and offset errors within the digitizer by comparison to a precision,
high-stability internal voltage reference for all ranges, input impedance paths (50 Ω and
1 MΩ), and filter paths.
•
Calibrates trigger level offset and gain.
•
Calibrates trigger timing, as well as the time-to-digital conversion circuitry to ensure
accurate trigger timing and time-stamping.
•
Calibrates gain, offset, and phase for interleaved ADC modes, reducing ADC interleaving
errors in time-interleaved sampling modes.
•
Calibrates the phase DAC used to adjust the phase of the sample clock.
Self-calibration takes approximately two minutes to complete.
Running Self-Calibration
Running self-calibration enables the PXIe-5160/5162 to yield full performance over its
operating temperature range and two-year external calibration cycle.
Before running self-calibration:
•
Warm up the PXIe-5160/5162 for at least 15 minutes
•
When possible, disconnect the inputs
1
PXIe-5160/5162 modules are externally calibrated at the factory, but for optimal performance,
use self-calibration in any of the following situations:
•
When the module is placed in a new system
•
When the temperature changes more than ±3 °C from the previous self-calibration
•
Once 90 days have elapsed since the previous self-calibration
Note
Unless temperature variations are a serious problem in your application, self-
calibration is not recommended more than once per day.
Tip
You can use the nodes on the NI-SCOPE External Calibration palette to
programmatically return the date and module temperature of the previous self-
calibration. You can also view this information by selecting the device in MAX.
Self-calibrate the PXIe-5160/5162 programmatically in NI-SCOPE or on demand in MAX.
Option
Description
NI-SCOPE
Use the Self Calibrate node to self-calibrate the module.
1
If high-voltage, high-frequency signals are present during self-calibration, the calibration results
may be adversely affected or the calibration may fail with an error.
PXIe-5160/5162 Getting Started Guide
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© National Instruments
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