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P77DESKEW Fixture Instructions

The P77DESKEW probe deskew

fi

xture provides an edge source to time-align

(deskew) signals at the inputs of P7700 Series probes. The

fi

xture provides a

means to deskew two probes at the same time. The probe and the

fi

xture are

powered by one of the USB ports of the oscilloscope; a USB cable (Tektronix part
number, 174-6919-xx) is included with the

fi

xture.

For performing the deskew procedure, Tektronix recommends using a
DPO/MSO70000C/70000DX series oscilloscope.

Connectors on the

fi

xture accept solder tips that are available for the P7700 Series

probes. The

fi

xture can also be used to deskew probes with browser accessories.

CAUTION.

The probes used with the deskew

fi

xture are ESD sensitive. To avoid

damaging the probes, perform these procedures at an antistatic workstation, with
an anti-static wrist strap while observing proper ESD practices. Refer to your
probe user manual for the anti-static information.

For best performance, you should check the calibration status of the oscilloscope
before performing the deskew procedure. If the oscilloscope requires calibration
or the probe requires compensation, perform these steps before deskewing the
probes. Refer to your oscilloscope manual for instructions on performing the
oscilloscope calibration procedures.

Check the calibration

status

To check the calibration status of the probe, perform the following steps:

1.

Select Probe Cal... from the Vertical menu.

2.

Select the channel to which the probe is attached and then check the Probe
Status readout. There are three possible values for the status:

Initialized

. The probe has not been calibrated on the selected channel;

perform the DC probe calibration procedure.

Compensated

. The probe has been calibrated on the selected channel.

Fail

. The probe has not been calibrated; repeat the procedure.

If the test continues to fail, troubleshoot the problem; do not continue with the
deskew procedure.

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Copyright © Tektronix

*P077126300*

077-1263-00

Summary of Contents for P77DESKEW

Page 1: ...your probe user manual for the anti static information For best performance you should check the calibration status of the oscilloscope before performing the deskew procedure If the oscilloscope requi...

Page 2: ...ey will be used 3 Connect the TekFlex tips to the ends of the main probe cables 4 For single ended inputs connect an SMA cable from a single source such as the FAST EDGE output connector on the oscill...

Page 3: ...under both probe tips are on If not double check your connections 7 For P77BRWSR browser accessory there are several pads on the deskew fixture that can be contacted by the browser tips Using these pa...

Page 4: ...on the B Port4 side of fixture board edge located between the Port1 and Port2 clamps Press the second tip against one of the ground pads on the right side of the row Figure 3 Connection points for the...

Page 5: ...l to use as the reference channel Channel 1 works well for this purpose 9 Select Deskew from the Vertical menu 10 Select the reference channel button and set the Deskew to 0 0 s 11 Set the acquisition...

Page 6: ...Select the button for the second channel that will be matched in time to the reference channel NOTE Do the next step at a signal amplitude within the same attenuator range vertical scale as your plann...

Page 7: ...its signal aligns with that of the reference channel When the signals are aligned they should look similar to the following figure Figure 6 Aligned signals no delay 19 Repeat the preceding steps for...

Page 8: ...ignal output at the solder tip clamps There is a 5 7 ps time difference between the first row of pads and the second row Environmental information Equipment Recycling This product complies with the Eu...

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