Basic measurement refers to the eight types of  
measurements assigned to the upper row keys on the front 
panel. 
Advanced measurement (page 55) mainly refers to the 
operation using the result obtained from one or more of the 
basic measurements. 
Refresh rate defines how frequently the GDM-8261A 
captures and updates measurement data. A faster refresh 
rate yields a lower accuracy and resolution. A slower 
refresh rate yields a higher accuracy and resolution. 
Consider these tradeoffs when selecting the refresh rate.   
For DC measurements, the frequency of  the refresh rate 
depends on the rate settings (S, M, F) and the ADC speed 
settings (Accurate, Quick) (page 92 ). 
For AC measurements, the refresh rate (S, M, F) is 
directly tied to the AC bandwidth settings (page 86).     
For further details, please see the specifications.