Agilent Technologies 35670A User Manual

To measure noise power (PSD)
1 Complete the one of the previous tasks: “To measure a wideband spectrum” or “To
measure a narrowband spectrum.”
2 Activate the trace you want to measure.
3 If the marker is not already turned on, press [
Marker
], then press [
MARKER ON OFF
]to
highlight ON.
4 Turn the knob to place the marker on the noise floor.
5 Press [
Trace Coord
][
Y UNITS
][
V^2/Hz (PSD)
].
6 Read the power spectral density (PSD) value from the marker readout.
When you select PSD units from the Y Units menu, amplitude values—including
those in the marker readout—are normalized to a 1 Hz bandwidth. Use the following
guidelines for accurate results:
• The noise you are measuring should be random.
• A fairly large number of measurements—100 or more—should be averaged
together using rms averaging.
• The marker should not be placed on any discrete component.
PSD readout.
For PSD measurements, move the marker to a typical
spot on the noise floor—do not place the marker on a
discrete component.
Agilent 35670A
Measuring Spectra and Networks Operator's Guide
4-6

Agilent Technologies 35670A Specifications

General

Brand	Agilent Technologies
Model	35670A
Category	Measuring Instruments
Language	English