Tektronix TDS 620A, TDS 640A, TDS 644A - page 174

Probe Cal
TDS 620A, 640A & 644A User Manual 3Ć99
TableĂ3Ć5:ăProbeCal Status (Cont.)
Probe TypeProbe Connected2
User
Cal'd?1Complex Interface4 Simple Interface3 Action
 
  
 
           
  
  
  
1Refers to a channel input that was  compensated at the time Probe Cal was last executed for the input channel.
2If no probe is connected, the probe status in the vertical main menu is always 
3A probe with a simple interface is a probe that can convey very limited information to the oscilloscope. Most passive probes (such as
the standard accessory P6139A) have simple interfaces.
4A probe with a complex interface is a probe that can convey additional information. For instance, it might automatically set the
oscilloscope input channel impedance to match the probe, send the oscilloscope a unique probe identification number,etc. Some
optical probes and most active probes (including the optional P6205) have complex interfaces.