Keysight x-series User Manual

3 Spectrum Analyzer Mode
3.10 TOI Measurement
Normally, the lower base frequency is set by choosing the lower in frequency of the
two highest peaks on the trace. When in Manual mode, the measurement frequency
is fixed.
When zero-span measurement is turned on, a frequency count is required to
accurately calculate the needed intermodulation frequencies. Thus, the
measurement will be slightly faster if you switch the lower base frequency to
manual.
Remote
Command
[:SENSe]:TOI:FREQuency:BASE:LOWer <freq>
[:SENSe]:TOI:FREQuency:BASE:LOWer?
Example
:TOI:FREQ:BASE:LOW 13.2500000 GHz
Notes Forces measurement restart
Couplings In Auto mode, after each sweep the lower frequency base is set to the lower in frequency of the two
highest peaks within the span. If there is no peak or only one peak within the span, the lower frequency
base is set to NaN
If you set Lower Frequency Tone >= Upper Frequency Tone, the Upper Frequency Tone changes to 1 Hz
greater than Lower Frequency Tone
If in Auto when Zero-Span measurement is on, a frequency count is run at the lower frequency base so
that we can more accurately calculate the intermod frequency. This is necessary since the Resolution
Bandwidth of the intermod measurement will likely be significantly lower than the main sweep RBW
Affected by "Freq Offset" on page 1826
When the lower frequency tone auto is changed, the upper frequency tone auto is set to the same value
Preset Determined by trace data
Min 10 Hz
Max The maximum value for this parameter is the maximum frequency of the instrument minus 1 kHz
Auto Function
Remote
Command
[:SENSe]:TOI:FREQuency:BASE:LOWer:AUTO OFF | ON | 0 | 1
[:SENSe]:TOI:FREQuency:BASE:LOWer:AUTO?
Example
:TOI:FREQ:BASE:LOW:AUTO ON
Preset
ON
Upper Tone
Sets the upper of the two base frequencies for TOI measurement.
Normally, the upper base frequency is set by choosing the higher in frequency of the
two highest peaks on the trace. When in Manual mode, the measurement frequency
is fixed.
When zero-span measurement is turned on, a frequency count is required to
accurately calculate the needed intermodulation frequencies. Thus, the
1824 Spectrum Analyzer Mode User's &Programmer's Reference

Keysight x-series Specifications

General

Analysis Bandwidth	Up to 1 GHz (depending on model)
Real-Time Bandwidth	Up to 1 GHz (depending on model)
Form Factor	Benchtop
Connectivity	LAN, USB, GPIB
Resolution Bandwidth	1 Hz to 10 MHz (depending on model)