Keysight N9918A - All about Trace Math; How to perform Trace Math

Data Analysis Features
All about Trace Math
466 Keysight N9927-90001 User’s Guide
All about Trace Math
Trace Math is available in CAT (excluding DTF measurements), NA Mode, and FOPS (under USB
Power Meter mode).
A trace is a series of measurement data points that are connected to form a line. This ‘live’ data
trace is updated as data points are measured.
A memory trace is a live trace that has been stored in the FieldFox volatile memory. It then becomes
static, meaning it is not updated with measurements. It can be displayed on the screen by itself, or
with a data trace for comparison purposes.
— In NA mode, memory traces are the same color as data).
— In CAT mode and FOPS, the data trace is displayed in yellow and the memory trace is displayed
in blue.
How to display data and memory traces
—Press Trace 6.
—Press Math and Memory
then Data->Mem to store the current live trace into memory. A ‘beep’
sounds to confirm the data trace has been saved to memory. There is no display annotation that
indicates that the memory trace has been stored.
—Press Data
to view only the data trace.
—Press Memory
to view only the memory trace.
—Press Data & Memory
to view both the live trace and the stored memory trace.
How to perform Trace Math
Trace math is performed between a live trace and a memory trace. When one of the following math
operations are selected, the yellow data trace displays the current measurement with the selected
trace math applied. The math operation symbol indicated below in [brackets] is displayed on the
lower left corner of the screen.
—Press Trace 6
.
— If not already stored, press Data->Mem
to store the current live trace into memory.
— Then Data Math
.
— Then choose one of the following:
— Data + Mem
[D+M] Current measurement data is added to the data in memory.
— Data – Mem
D-M] Current measurement data is subtracted from the data in memory.
Noise Figure (NF—Opt. 356) does not have trace math, but does have the
ability to display data and memory traces. Refer to “How to display data
and memory traces”.