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National Instruments Corporation
7
NI 5450 Calibration Procedure
Note
The delay times indicated in this procedure apply specifically to the Fluke 9500B/
Wavetek 9500 calibrator. If you use a different instrument, 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 specifications 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, NI-SCOPE automatically
loads with the operating system and enables the device. The warm-up
time ensures that the measurement circuitry of the digitizer is at a
stable operating temperature.
For PXI digitizers
:
•
Ensure that the PXI chassis fan speed is set to HIGH, that the fan filters
are clean, and that the empty slots contain filler panels. For more
information, refer to the
Maintain Forced Air Cooling Note to Users
,
which is available at
ni.com/manuals
.
•
Plug the PXI chassis and the calibrator into the same power strip to
avoid ground loops.
BNC Power
Splitter
Mini-Circuits Power Splitter
ZSC 2-1+
Trigger
Accuracy
Insertion Loss:
< 4 dB at 10 MHz
Amplitude Imbalance:
0.2 dB
BNC
Feedthrough
Terminator
Pomona 4119 BNC Feedthrough
Terminator
Trigger
Accuracy
50
Ω
Frequency Range:
DC to 10.1 MHz
VSWR: 1.1 at 10 MHz
Table 2.
Required Equipment Specifications for NI 5152/5153/5154 External Calibration (Continued)
Required
Equipment
Recommended
Equipment
Parameter
Measured
Specification