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Probe Cal
TDS 620A, 640A & 644A User Manual
3Ć99
TableĂ3Ć5:ăProbe Cal Status (Cont.)
Probe Type Probe Connected
2
User
Cal'd?
1
Complex Interface
4
Simple Interface
3
Action
Yes Disconnect
Probe
Initialized Initialized
Yes Connect
Probe
Can not detect different probe: Display ReĆuse
Probe Calibration Data menu
Different probe: Initialized
Cal'd Probe: Pass
Different probe: Initialized
1
Refers to a channel input that was successfully compensated at the time Probe Cal was last executed for the input channel.
2
If no probe is connected, the probe status in the vertical main menu is always initialized.
3
A 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.
4
A 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.