Keysight Technologies N8480 Series, Operating And Service Manual

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1 Introduction
8 N8480 Series Power Sensors Operating and Service Guide
Modulation Effect
When measuring RF or microwave sources that are modulated at the
chopper frequency (nominally 440 Hz), at the first or second harmonic or
submultiples of the chopper frequency, beat notes may occur. Unless these
beat notes are exactly the chopper frequency, they can usually be
eliminated by averaging (filtering) since the amplitudes are plus and
minus the actual power. These frequencies may also be avoided by
changing the modulation frequency slightly, if possible.
Refer to the respective power meter’s User’s Guide for information on
setting the averaging (filtering).
Torque
Table 1- 2 shows the connector type (for connection to DUT) for the power
sensor models. A torque wrench must be used to tighten these connectors.
Only use a wrench set to the correct torque value.
1
Balldriver is used to tighten the screws, instead of the connector.
Table 1-2 RF connector type, wrench size, and torque values
Model Option RF Connector Wrench Size Torque Value
N8481A
N8481A-100 Type-N (male)
3/4 inch open end 12 lb-in
N8481A-200 APC-7
N8482A N8482A-100
Type-N (male)
N8481B N8481B-100
N8482B N8482B-100
N8481H N8481H-100
N8482H N8482H-100
N8485A N8485A-100 3.5 mm (male)
3/4 inch or 20 mm
open end
8 lb-in
N8487A N8487A-100 2.4 mm (male) 5/16 inch open end 8 lb-in
N8488A N8488A-100 1.85 mm (male) 4/5 inch open end 8 lb-in
N8486AQ N8486AQ-100
Waveguide Flange
UG-383/U
3/32 inch
Balldriver-Hex
1
3.75 lb-in
N8486AR N8486AR-100
Waveguide flange
UG-599/U
3/32 inch
Balldriver-Hex
1
3.75 lb-in