Teledyne LabMaster 10 Zi Series Operator's Manual page 146

Math functions are categorized into Basic and Special.
Optionally, make any other settings on the Function (Fx) dialog you
wish:

Change the source waveform on which math is performed in
Source 1.

Touch the dual function button to chain functions.
LM10Zi-GSM-E Rev A
Getting Started Guide
139