- Deskews to +/– 20 ps typical accuracy
- Differential and single-ended drive
- 75 ps edge for precise deskewing
- Calibrates gain, offset and skew at same probing point
- Accounts for risetime variations
- Accounts for common-mode voltage variations
- DC gain calibration accounts for probe loading effects
- Integrated operation with scope for fully automatic calibration
Probe Deskew and Calibration
The TF-DSQ fixture provides industry leading probe deskew and calibration capability. High-end scopes and probes are used to make important measurements where extreme precision is required.
Probes present unique problems when utilized for high-speed measurements. The most important problem is that of differences in delay through the probe cable. When multiple probes are utilized for high-speed timing measurements, differences in the delay through the probe cable must be accounted for and calibrated out. Similarly, the gain and offset must be calibrated for proper measurement results. Nothing is more frustrating than spending the time and effort connecting a set of probes to a circuit and realizing that the probes have not been properly calibrated. For this reason, the TF-DSQ fixture and software are designed in a manner that requires one connection of the probe to the fixture and one button press producing probe calibration results that are valid for the duration that the probe is connected to the circuit.
TF-DSQ provides an extremely fast edge with 75 ps risetime.When a probe is connected to the fixture and deskewed, this fast risetime provides a typical edge timing accuracy of +/– 20 ps. Risetime correction is provided by entering the measured risetime of the signals being measured.The scope software makes adjustments to the measured deskew amounts to account for risetime variations.
Probe Gain and Offset Calibration
TF-DSQ provides DC levels to a probe to calibrate the probe for gain and offset over all voltage ranges.To account for probe loading, the TF-DSQ fixture measures the voltage applied to the probe tips to calibrate out any probe loading effects and to improve DC measurement accuracy.
Calibrates Single-ended and Differential Probes
TF-DSQ calibrates single-ended and differential probes in the exact configuration that they are used. Single-ended probes are calibrated using a ground reference and differential probes are calibrated differentially. When probing accessories are utilized for connection to the circuit, such as solder-in adapters, the soldered leads are connected to the fixture via a clamp that fixes the leads to the calibration point. In the case of differential probe calibration, a common mode voltage can be specified so that the differential gain and offset is calibrated with the common mode component for increased probing accuracy.