To measure a wideband spectrum
You must sometimes survey all frequencies within the analyzer’s measurement range
to locate the signal components you want to examine more closely. A two-channel
Agilent 35670A, can measure all frequencies between 0 and 102.4 kHz when one
channel is active; it can measure between 0 and 51.2 kHz when two channels are
active. A four-channel Agilent 35670A can measure all frequencies between 0 and
51.2 kHz when one or two channels are active; it can measure between 0 and 25.6 kHz
when four channels are active.
1 Initialize the analyzer.
Press [
Preset
][
DO PRESET
].
Press [
Inst Mode
][
FFT ANALYSIS
].
Press [
CHANNELS 1 2
] (or [
CHANNELS 1 2 4
]) to highlight the number of channels you
want activated.
Press [
Active Trace
], then press [
A
] if you are measuring one signal, [
AB
] if you are
measuringtwo,or[
ABCD
] if you are measuring three or four.
Press [
Meas Data
][
ALL CHANNELS
][
PWR SPEC CHANNEL *
].
2 Connect your test signals to the input connectors (as shown below).
3 Specify the measurement parameters.
Press [
Freq
][
FULL SPAN
].
Press [
Window
][
FLAT TOP
].
If the signals include large dc components, press [
Input
][
ALL CHANNELS
]
[
FRONT END CH* SETUP
], then press [
COUPLING AC DC
] to highlight AC.
Option AY6
Agilent 35670A
Measuring Spectra and Networks Operator's Guide
4-2