Tektronix 067-2431-xx Deskew Fixture Primary User

067-2431-xx
Deskew Fixtur

ZZZ

Instructions

Internal circui
between –1.5 and +4 volts, with a rise time of
40 ps. The fixture
ports of the oscilloscope.

Connectors on the fixture accept the coax
adapters and solder tips that are available for the

e

P7600 Series probes.

NOTE. You cannot deskew probes with coax
connectors to probes with solder tips; only
coax-to-coax or tip-to-tip probes can be
deskewed together.

CAUTION. The deskew fixture is ESD
sensitive. To avoid damaging the fixture,
only use it at an antistatic workstation and
observe proper ESD practices.

Standard Accessories

The following
deskew fixture:

try conditions the input signal to

is powered by one of the USB

accessories are included with the

Deskew Procedur

compensates for signal delays that occur between
probes due to dif
The oscilloscope deskew feature applies deskew
values after it
deskew values do not affect logic triggering.
Deskew has no af
formats.

e. The deskew function

ferent tips or cable lengths.

completes each acquisition. The

fect on XY and XYZ display

*P071302900*

071-3029-00

Deskew Fixture

The probe deskew fixture provides an edge
source to time-align (deskew) signals at the
inputs of P7600 Series probes. It allows you
to deskew the probes when you are using
P76CA-xxx probe adapters with coax cables or
the P76TA solder tip adapter with P7500 Series
TriMode Probe solder tips.

The edge signal input voltage is internally
adjustable to accommodate different logic levels,
and is provided by the oscilloscope FAST EDGE
output or by an external source. The edge signal
input voltage must be between –2 and +5 volts,
with a 1 ns or faster rise time.

Accessory

USB cable, A to B, 6 ft

SMA cable, male-to-male, 36 in

Adjustment tool 003-1890-xx

Instructions 071-3029-xx

Overview

For best performance, you should do the DC
Calibrati
Deskew procedure. Refer to your probe manual
for detail
Probe Calibration Procedure.

You should also check the calibration status of the
probes that you intend to use prior to performing
the deskew procedure. Use the procedure below.

Check the Calibration Status.

1. Select Probe Cal... from the Vertical menu.

2. Select the channel to which the probe is

If the te
problem; do not continue with the deskew
procedu

on procedure before performing the

ed instructions for performing the DC

attached and then check the Probe Status
readout:

Initialized. The probe has not been

ed on the selected channel; perform

calibrat
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.

st continues to fail, troubleshoot the

re.

Tektronix
part number

174-5194-xx

174-5631-xx

1. Connect the deskew fixture to a USB power
source. The power LED lights and the
solder tip retainer clips illuminate.

2. Connect the probes to the oscilloscope.

3. Connect th

connectors that match your probe. Leave
the 50 Ω ter
connectors.

NOTE. If y
solder tips, use the same solder tips with
the desk
measurements.

NOTE. You cannot deskew probes with coax
connect
coax-to-coax or tip-to-tip probes can be
deskewe

e probes to the fixture, using the

minations on any unused SMA

Connect the P76CA–292 or

P76CA–292C coax adapters to
the SMA connectors on the fixture.

Connect the P76CA–SM P coax

adapters to SMP-to-SMA adapters, and
then to the SMA connectors on the
fixture.

Attach the P76TA probe solder tip

adapter w
Probe solder tips beneath the
spring-l
LEDs with adjustable brightness help
you align
fixture contacts. See figure below.

ith P7500 Series TriMode

oaded retainers on the fixture.

the probe tip leads to the

ou are deskewing probes with

ew fixture that you will use to take

ors to probes with solder tips; only

d together.

4. Connect th

e edge signal input to the fixture.
Use either the FAST EDGE output on the
oscillosc

ope, or connect an external source.
The external signal source voltage must be
between –2

and+5volts,witha1nsor

faster rise time.

CAUTION. D

o not exceed the input voltage
limits of the fixture. Damage to the fixture
and probes

may result.

7. Select a referen

ce channel with which all
other channels will be deskewed. This is
typically Chann

el 1, but can vary depending

on your setup.

8. Select Deskew from the Vertical menu.

9. Select Channel 1 and set the Deskew to

0.0 s.

10. Display all channels to deskew, including
the reference c

hannel.

11. Set the Display Persistence to Infinite
Persistence mode.

12. Set the Record View Palette to Temperature
Grading.

13. Adjust the trigger level to get a stable
trigger.

14. Adjust the vertical SCALE, POSITION,
and OFFSET for each channel so that the
signals overlap and are centered on screen.
Make sure all channels being deskewed are
at the same volts/div setting. Deskew the
channels at the same level as your planned
signal measurement.

15. Adjust the horizontal POSITION so that
a triggered rising edge of the reference
channel is at center screen.

16. Adjust the horizontal SCALE so the
differences

in the channel delays are clearly

visible.

17. Adjust the horizontal POSITION again so
that the first rising edge of the reference
channel is at center screen.

18. Select Deskew from the Vertical menu.

19. Select one of

the channels to match to the

reference channel.

Equipment Recyc

complies with the European Union’s
requirements according to Directive
2002/96/EC on waste electrical and
electronic equipment (WEEE). For
more information about recycling
options, check
section of the Tektronix Web site
(www.tektronix.com).

ling. This product

the Support/Service

Contacting Tektronix

Web site: www.tektronix.com

Phone: [phone]

Address: Tektronix, Inc.

Email:

Department or name (if known)
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077 USA

[e-mail]

Warranty Information

For warranty information, go to
www.tektronix.com/warranty.

5. Connect a DMM or oscilloscope to the
threshold level monitor pins.

6. Using an insulated tool, adjust the threshold
level on the fixture to the appropriate logic
level (for example, 1.4 V for TTL circuits).

NOTE. Do the n

ext step at a signal amplitude
within the same attenuator range (vertical scale)
as your plan

ned signal measurements. A ny
change to the vertical scale after the deskew is
complete ca

n change the attenuator setting and
give a slightly different signal path. This signal
path differ

ence can cause as high as 100 ps

variation in timing skew between channels.

20. Adjust the d

eskew time for that channel
so that its signal a ligns with that of the
reference c

hannel.

21. Repeat steps 19 and 20 for each additional
channel that you want to deskew.

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