Calibrations And Custom Test Standards - Fluke DSP-4100 User Manual

Calibrating the Permanent Link Adapters
The optional DSP-PLCAL automated calibration kit lets you calibrate your
permanent link adapters to meet enhanced accuracy specifications. Calibration
compensates for physical changes that occur over time to the adapter's cable and
other components. Regular calibration helps eliminate false fail results and helps
ensure that test results represent the link's actual performance.
Fluke Networks recommends that you use the DSP-PLCAL kit to calibrate your
adapters after the first 40 hours of use. Thereafter, calibrate the adapters at least
every 6 months.
Contact Fluke Networks for more information on the DSP-PLCAL kit.
NVP Calibration
The Determine Cable NVP function allows you to determine the NVP (nominal
velocity of propagation) for a known length of cable and save the value for
additional measurements of unknown lengths of the same type of cable. The
calibrated NVP value applies only to the selected test standard. You can also enter
a known NVP value or use the Set to Default softkey to set the NVP to
the default value, which is the NVP for a typical sample of the selected cable type.
To determine a cable's NVP value, proceed as follows:
To determine a cable's NVP, you should use a cable at least 15 m
(50 ft) long. The recommended length is 30 m (100 ft).
NVP is determined for the cable pair with the shortest electrical
delay.
1. Attach a channel link interface interface adapter to the main unit.
2. Turn the rotary switch to SPECIAL FUNCTIONS.
3. Use D to highlight Determine Cable NVP.
4. Press E.
5. As prompted by the display, connect a known length of the appropriate cable
to the test tool. Use the RJ45 to BNC adapter, if necessary.
6. Verify that no cables are connected to the DB9 connector on the test tool.
7. Press T.
8. Use D or U to change the displayed length to the known length of the
attached cable. As you adjust the length measurement, the NVP value changes
automatically. The range for NVP values is 50.0 % to 99.9 %.

Calibrations and Custom Test Standards

Calibrating the Permanent Link Adapters
Notes
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