Functional Check
16 P6249 4 GHz 5X Active Probe Instruction Manual
Probe Calibration Errors
If you get the message “Probe Cal Failed”, or other calibration
anomalies occur, you may be using an oscilloscope that is not fully
compatible with the P6249 probe, or you may have a hardware
problem.
Check Compatibility
Before suspecting a problem with your probe, compare your
oscilloscope firmware version with those listed in Table 1.
Table 1: TDS 500, 600, or 700 series oscilloscopes fully compatible
with the P6249 probe
Model number Firmware version required
TDS 520D greater than FV:6.3e
TDS 540D greater than FV:6.3e
TDS 580D greater than FV:6.3e
TDS 654C FV:5.1e or above
TDS 680C FV:5.1e or above
TDS 684C FV:5.1e or above
TDS 694C all versions compatible
TDS 724D greater than FV:6.3e
TDS 754D greater than FV:6.3e
TDS 784D greater than FV:6.3e
TDS 794D greater than FV:6.3e
NOTE. You can take P6249 probe measurements with any TDS 500,
600, or 700 series oscilloscope, regardless of firmware version. The
fully compatible oscilloscopes listed in Table 1 give you enhanced
accuracy after successfully passing the probe calibration function.