Keysight Technologies 85054B, User'S And Service Manual

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3- 20 85054B
Use, Maintenance, and Care of the Devices
Using the Sliding Load
Using the Sliding Load
When performing a sliding load calibration, it is recommended that the sliding ring be set at the
marked positions (rings) along the sliding load body. Using the set marks ensures that a broad
distribution of phase angles is selected, thereby optimizing the calibration.
The set marks function as detents so that the internal center of the sliding ring can mate with
them. Because of this, the set mark being used cannot be seen but is felt as the sliding ring is
moved from mark to mark during a calibration. Moving the sliding ring with only the index
fingers of both hands will increase your ability to detect the sliding ring detent at each position.
NOTE The sliding load uses a plastic bead to support its center conductor when it is
stored. Remove this support bead from the sliding load before you connect the
load for use. Reinsert this support bead when you are finished using the sliding
load.
Preferred Method:
1. Move the sliding ring forward as far as possible toward the connector end of the load.
2. Move the sliding ring back until you feel it detent at the first set mark.
3. Follow the network analyzer instructions to measure the sliding load at each detent position.
NOTE After a calibration has begun, always move the sliding ring toward the center
conductor pullback end of the sliding load. If you slightly overshoot the desired
mark by less than 0.5 mm (0.02 inch), do not move the sliding ring, but continue
with the calibration as if the sliding ring is set to the proper position. If the sliding
ring is moved toward the connector end of the load during the calibration
sequence, the calibration may be unstable and poor measurements may result. If
the desired position is overshot by more than 0.5 mm (0.02 inch), restart the
calibration sequence from step 1. 

It does not matter if you start with the slide at the front and move it backwards, or
start at the back and move it forward. To minimize stability errors, it is important to
start at one end and move it in the same direction for each of the measurement
steps.
This manual contains limited information about a sliding load calibration. For detailed
information on this calibration using a VNA, ENA or PNA series network analyzer, refer to the
appropriate user guide or online Help.
• To view the ENA or PNA online Help, press the Help key on the front panel of the network
analyzer.
• To view an online VNA user guide, use the following steps:
1. Go to www.keysight.com .
2. Enter your VNA model number (Ex: N5242A) in the Search box and click
Search
.