NI 5922 Calibration Procedure
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© National Instruments
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9
External Calibration Requirements
Test Equipment
Table 2 lists the equipment required for externally calibrating the NI 5922. If you do not have
the recommended instruments, use these specifications to select a substitute calibration standard.
Note
The delay times indicated in this procedure apply specifically to the
Fluke 9500B calibrator. If you use a different calibrator, you may need to increase
these delay times. This increase varies between calibrator models.
Test Conditions
Follow these guidelines to optimize the connections and the environment during calibration:
•
Always connect the scope calibrator to the input BNC of the oscilloscope, or use a short
50
Ω
BNC coaxial cable if necessary. Long cables and wires act as antennas, picking up
extra noise that can affect measurements.
•
Keep relative humidity between 10 and 90%, non-condensing.
•
Maintain an ambient temperature of 23 ±5 °C.
•
Allow a warm-up time of at least 15 minutes after NI-SCOPE loads. Unless manually
disabled, NI-SCOPE automatically loads with the operating system and enables the device.
The warm-up time ensures that the measurement circuitry of the NI 5922 is at a stable
operating temperature.
•
Ensure that the PXI chassis fan speed is set to HI, that the fan filters are clean, and that the
empty slots contain filler panels.
•
Plug the PXI chassis or PC and the calibrator into the same power strip to avoid ground
loops.
Table 2.
Required Equipment for NI 5922 External Calibration
Required
Equipment
Recommended
Equipment
Parameter
Measured
Specification
Signal Generator
Fluke 9500B
oscilloscope
calibrator
9510 Test Head
(or Wavetek 9500
with
high-stability
reference option)
Timing
2 ppm frequency
accuracy
DC Source
Fluke 5700
Vertical Gain
DC ±50 ppm into 1 M
BNC cable
—
—
50
Ω
