©
National Instruments Corporation
11
NI 5421/5441 Calibration Procedure
External Calibration Requirements
This section describes the test equipment and test conditions required for
calibration.
Test Equipment
External calibration requires different equipment for each applicable
specification. Refer to Table 2 for a list of equipment.
Test Conditions
Follow these guidelines to optimize the connections and the environment
during calibration:
•
Keep connections to the NI 5421/5441 short.
•
Keep relative humidity below 80%.
•
Maintain a temperature between 18
°
C and 28
°
C.
•
Observe the 15-minute warm-up time.
Table 2.
Equipment Required for Calibrating the NI 5421/5441
Instrument
Applicable
Specification
Minimum
Specifications
Recommended
Instrument
Digital multimeter
(DMM)
DC gain and offset
DC accuracy
≤
±50 ppm
Resolution
≤
1
µ
V
NI PXI-4070
Agilent/HP 34401A
Keithley 2000
Male banana to
female BNC adapter
—
—
Male BNC to
female SMB cable
50
Ω,
RG-223
—
Spectrum analyzer or
frequency meter
Frequency accuracy
Ability to measure
10 MHz or higher
sine waves
Frequency accuracy
to ±500 ppb
NI PXI-5660
Agilent/HP 8560E
Agilent/HP 53131A
or HP 53132A
with timebase option
001, 010, or 012
Male BNC to
female SMB cable
50
Ω,
RG-223
—
