NI 5122/5124 Calibration Procedure
12
ni.com
External Calibration Requirements
Test Equipment
Table 2 lists the equipment required for externally calibrating the
NI 5122/5124. 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 adjust these delay times.
Test Conditions
Follow these guidelines to optimize the connections 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.
•
Keep relative humidity between 10 and 90% non-condensing, or
consult the digitizer hardware documentation for the optimum relative
humidity.
•
Maintain an ambient temperature of 23 ±5 °C.
•
Allow a warm-up time of at least 15 minutes after the NI-SCOPE
driver is loaded. Unless manually disabled, the NI-SCOPE driver
automatically loads with the operating system and enables the device.
The warm-up time ensures that the measurement circuitry of the
NI 5122/5124 is at a stable operating temperature.
Table 2.
Required Equipment Specifications for NI 5122/5124 External Calibration
Required
Equipment
Recommended
Equipment
Parameter
Measured
Specification
Signal Generator
Fluke 9500B
oscilloscope
calibrator
(Wavetek 9500
with high-stability
reference option)
9510 Test Head
Vertical Gain
DC ±(0.025% + 25
µ
V) into 1 M
Ω
or 50
Ω
Bandwidth
±1.5% output amplitude flatness
for leveled sine wave up to
100 MHz relative to 50 kHz into
1 M
Ω
or 50
Ω
Timing
2 ppm frequency accuracy
BNC cable
—
—
50
Ω
