NI 5122/5124/5142 Calibration Procedure
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© National Instruments
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3
Calibration Interval
National Instruments recommends a minimum calibration interval of two years
for the
NI 5122/5124/5142. You should adjust the recommended calibration interval based on the
measurement accuracy demands of your application.
Test Equipment
National Instruments recommends that you use the equipment in Table 2 for calibrating the
NI 5122/5124/5142.
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 adjust these delay
times.
Test Conditions
Follow these guidelines to optimize the equipment and the environment during calibration:
•
Always connect the calibrator test head directly to the input BNC of the digitizer, or use a
short 50
Ω
BNC coaxial cable if necessary. Long cables and wires act as antennae, picking
up extra noise that can affect measurements.
•
Verify that all connections to the device, including front panel connections, are secure.
•
Maintain an ambient temperature of 23 ±5 °C. The device temperature will be greater than
the ambient temperature.
•
Keep relative humidity below 80%.
Table 2.
Test Equipment
Equipment
Recommended
Model
Parameter
Measured
Requirements
Signal generator
Fluke 9500B
oscilloscope
calibrator
OR
Wavetek 9500 with
high-stability
reference option
Fluke 9510 test
head
DC Accuracy
DC ±(0.025% + 25
μ
V)
into 1 M
Ω
or 50
Ω
Bandwidth, trigger
sensitivity
±2% output amplitude
flatness for leveled sine
wave up to 150 MHz
relative to 50 kHz into
1 M
Ω
or 50
Ω
Timing Accuracy
±2 ppm frequency
accuracy
BNC cable
—
—
50
Ω
