Tektronix P6250, P6251 Combined User/Service

xx

P6250 & P6251
500 MHz and 1 GHz High Voltage Differential Probes

ZZZ

Technical Reference

www.tektronix.com

071-2432-00

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are
protected by na

tional copyright laws and international treaty provisions.

Tektronix prod
previously published material. Specifications and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

TekProbe is a trademark of Tektronix, Inc.

ucts are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all

Contacting Tektronix

Tektronix, Inc.
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA

For product information, sales, service, and technical support:

In North America, call 1-800-833-9200.
Worldwide, visit www.tektronix.com to find contacts in your area.

Table of Contents

General Safety Summary ............ . . . . . . . . . . . . . . . . ............. . . . . . . . . . . . . . . . . . .............. . . . . . . . . . . . . . . . . .............. . . . . . .. iii

Service Safet

Preface................................................................................................................................. v

Specifications .......................................................................................................................... 1

Warranted Char

Typical Characteristics ................................................................................................................ 3

Nominal Characteristics ............................................................................................................... 8

Probe Tip Adapt

Performance Verification ............................................................................................................. 15

Required Equipment ...... . . . . . . . . . . . . . . . .............. . . . . . . . . . . . . . . ............. . . . . . . . . . . . . . . . ................ . . . . . . . . . . . . . . . 16

Special Adapte

Preparation .. . . . . . . . . . . . . ................ . . . . . . . . . . . . . . . . . .................. . . . . . . . . . . . . . . . . . . ................ . . . . . . . . . . . . . . . . . .. 19

DC Attenuation Accuracy .. . . . . . . . . . . . . . ................... . . . . . . . . . . . . . . . . . . . .................... . . . . . . . . . . . . . . . . . . . ........... 20

Differential S

Analog Bandwidth........... . . . . . . . . . . . . . . . ............... . . . . . . . . . . . . . . . ............... . . . . . . . . . . . . . . . . .............. . . . . . . . . . . 24

Common Mode Rejection Ratio ................................................................................................ 27

Rise Time........................................................................................................................28

High Voltage Rise Time Check (Optional) . . .............. . . . . . . . . . . . . . ............. . . . . . . . . . . . . . . ............. . . . . . . . . . . . . . . .. 32

Alternate Verification Procedures.. . . . . . . . . . . . . . . ............... . . . . . . . . . . . . . . ................. . . . . . . . . . . . . . . ............... . . . . 37

Adjustment Proc

Equipment Required for Adjustment Procedure .. . . . . . . . . . . . . . . . .................... . . . . . . . . . . . . . . . . . . ................. . . . . . . . 43

Offset (Preliminary) .............................................................................................................44

Gain.............................................................................................................................. 45

Offset (Final)..................................................................................................................... 46

DC CMRR ....................................................................................................................... 46

AC CMRR ....................................................................................................................... 48

Maintenance .......................................................................................................................... 49

Inspection and Cleaning . . . . . . . . . . . . . . . . . . ............. . . . . . . . . . . . . . . . . . .............. . . . . . . . . . . . . . . . . ............... . . . . . . . . . . . 49

Replacement Part

Preparation for Shipment ... . . . . . . . . . . . . . . . . .............. . . . . . . . . . . . . . . ................. . . . . . . . . . . . . . . . .............. . . . . . . . . . . 49

y Summary .............................................................................................................. iv

acteristics............................................................................................................. 2

er Specifications ..................................................................................................... 9

rs ................................................................................................................ 17

ignal Range . . . . . . . ............ . . . . . . . . . . . . . ............. . . . . . . . . . . . . ............. . . . . . . . . . . . . . .............. . . . . . . 22

edures . . . .......... . . . . . . . . . . . . ............ . . . . . . . . . . . .............. . . . . . . . . . . . . ........... . . . . . . . . . . . . ............ . 42

s.............................................................................................................. 49

Table of Content

s

P6250 & P6251 Technical Reference i

Table of Content

s

ii P6250 & P6251 Technical Reference

General Safety S

ummary

General Safet

Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it.

To avoid potential hazards, use this product only as specified.

Only qualified personnel should perform service procedures.

While using this product, you may need to access other parts of a larger system. Read the safety sections of the other
component manuals for warnings and cautions related to operating the system.

To Avoid Fire or Personal Injury

Connect and Disconnect Properly. Do not connect or disconnect probes or test leads while they are connected

to a voltage s

Ground the Pro

To avoid electric shock, the grounding conductor must be connected to earth ground. Before making connections to the input
or output terminals of the product, ensure that the product is properly grounded.

Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings and markings on the product. Consult

the product m

Connect the p

Do not apply a

ource.

anual for further ratings information before making connections to the product.

robe reference lead to earth ground only.

potential to any terminal, including the common terminal, that exceeds the maximum rating of that terminal.

y Summary

duct.

This product is indirectly grounded through the grounding conductor of the mainframe power cord.

Do Not Operat

Do Not Operat

qualified service personnel.

e Without Covers.

e With Suspected Failures.

Do not operate this product with covers or panels removed.

If you suspect that there is damage to this product, have it inspected by

Avoid Exposed Circuitry. Do not touch exposed connections and components when power is present.

Do Not Operate in Wet/Damp Conditions.

Do Not Operate in an Explosive Atmosphere.

Keep Product Surfaces Clean and Dry.

P6250 & P6251 Technical Reference iii

Service Safety S

TermsinthisManual

These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that could result in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property.

Symbols and Terms on the Product

These terms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you read the marking.

WARNING indicates an injury hazard not immediately accessible as you read the marking.

CAUTION indicates a hazard to property including the product.

The following symbol(s) may appear on the product:

ummary

Service Safety Summary

Only qualified personnel should perform service procedures. Read this Service Safety Summary and the General Safety
Summary before performing any service procedures.

Do Not Service Alone. Do not perform internal service or adjustments of this product unless another person capable of

rendering first a id and resuscitation is present.

Disconnect Power. To a v o

mains power.

Use Care When Servicing With Power On. Dangerous voltages or currents may exist in this product. Disconnect

power, remove battery (if applicable), and disconnect test leads before removing protective panels, soldering, or replacing
components.

To avoid electric shock, do not touch exposed connections.

id electric shock, switch off the instrument power, then disconnect the power cord from the

iv P6250 & P6251 Technical Reference

Preface

This is the Technical Reference for the P6250 & P6251 differential probes. This manual provides specifications and
performance verification procedures for the probes.

Preface

P6250 & P6251 Technical Reference v

Preface

vi P6250 & P6251 Technical Reference

Specifications

Specification

The specifications in the following Tables apply to a P6250 or P6251 differential probe installed on a Tektronix TDS5000B
oscilloscope. When the probe is used with another oscilloscope, the oscilloscope must have an input impedance of 50 Ω
and a bandwidth of 1 GHz. The probe must have a warm-up period of at least 20 minutes and be in an environment that
does not exceed the limits described. (See Table 1.) The probe calibration should be run on the host instrument before
verifying the warranted probe specifications. Specifications for the P6250 and P6251 differential probes fall into three
categories: warranted, typical, and nominal characteristics.

s

P6250 & P6251 Technical Reference 1

Warranted Chara

cteristics

Warranted Cha

Warranted characteristics describe guaranteed performance within tolerance limits or certain type-tested requirements. (See
Table 1.) Warranted characteristics that have checks in the Performance Verification section are marked with the

Table 1: Warranted electrical characteristics

Specification P6250 P6251

Differential signal range (DC coupled)

Common-mode signal range (DC coupled)

Maximum nondestructive input voltage
between signal and common of the same
channel

DC attenuatio

Bandwidth (4.25 V range (÷ 5), probe

only)

Rise time, 4.25 V range (÷ 5), probe

only (10–90%,

Common-mode rejection ratio

Temperature

Humidity

1

See warning that follows.

n accuracy

+20°Cto+30°C)

racteristics

±4.25 V

±42 V

±35V

±100 V

(DC + peak AC)

(DC + peak AC)

(DC + peak AC)

(DC + peak AC)

;3V

;30V

;25V

RMS

RMS

RMS

±4.25 V

±42 V

±35V

±100 V

(DC + peak AC)

(DC + peak AC)

(DC + peak AC)

(DC + peak AC)

;3V

;30V

;25V

RMS

RMS

RMS

±5% of input (both ranges) ±5% of input (both ranges)

DC to ≥500 MHz DC to ≥1GHz

≤700 ps ≤350 ps

42 V range (÷ 5

>55 dB at 30 kHz

>50dBat1MHz

>18 dB at 250 MH

Operating: 0

0):

z

to +40 °C (32 °F to +104 °F)

42 V range (÷ 5

>55dBat30kHz

>50 dB at 1 MHz

>18 dB at 250 MH

Nonoperating: –55 to +75 °C (–67 °F to –167 °F)

1

0):

z

Operating: 0-90% RH, tested at + 30 to +40 °C

Nonoperating: 0-90% RH, tested at +30 to +60 °C

symbol.

WARNING. To avoid a burn hazard at high ambient temperatures, do not touch the probe with bare hands at nonoperating

temperatures above + 50 °C .

2 P6250 & P6251 Technical Reference

Typical Charact

eristics

Typical Chara

Typical characteristics (Tables 2 and 3) describe typical but not guaranteed performance for both probes.

Table 2: Typical electrical characteristics

Differential input resistance, DC coupled 1 MΩ

Common mode input resistance 500 kΩ

Differential input capacitance

Common-mode input capacitance

Harmonic distortion

Offset accuracy ±10 mV ±2% of offset setting at 20 to +30 ° C (68 °F to

Differential offset range ±4.25 V (÷ 5), ±42 V (÷ 50)

Common mode rejection ratio (See Figure 5 on page 5.) (See Figure 6 on page 6.)

System noise

Referred to probe output

Input impedance

Bandwidth limit ≥ –3 dB at 5 MHz

Propagation delay

cteristics

<1.0 pF at 1 MHz

<2.0 pF per side at 1 MHz

≤1.5% measured using 495 mV
100 MHz

+86 °F)

<2.0 mV
(÷ 50))

(See Figure 7 on page 6.)

6.5 ns from probe tip to output

(4.25 V range (÷ 5)), <1.0 mV

RMS

RMS

(or 1.4 V

RMS

) output at

P-P

(42 V range

1: Typical bandwidth (P6250)

Figure

P6250 & P6251 Technical Reference 3

Typical Charact

Figure 2: Typical bandwidth (P6251)

eristics

Figure 3: Typical rise time (P6250)

4 P6250 & P6251 Technical Reference

Typical Charact

eristics

Figure 4: Typical rise time (P6251)

Figure 5: Typical Common-Mode Rejection Ratio (P6250)

P6250 & P6251 Technical Reference 5

Typical Charact

Figure 6: Typical Common-Mode Rejection Ratio (P6251)

eristics

Figure 7: Typical input impedance versus frequency

6 P6250 & P6251 Technical Reference

Table 3: Typical mechanical characteristics

Typical Charact

eristics

Dimensions, input connection

Dimensions, control box

Dimensions, probe head

Dimensions, output cable

Unit weight (p

robe only)

0.63 mm (0.025 i

82 mm × 41 mm × 26

86 mm × 11 mm × 6.

1.22 m (48 in)

163 g (5.24 oz)

n) square pin on 2.54 mm (0.100 in) centers

mm (3.2 in × 1.6 in × 1 .0 in)

3mm(3.4in×0.45in×0.25in)

P6250 & P6251 Technical Reference 7

Nominal Charact

eristics

Nominal Chara

Nominal characteristics (Table 4) describe guaranteed traits, but the traits do not have tolerance limits.

Table 4: Nominal electrical characteristics

Input configuration Differential (two inputs, + and - ), with case ground

Output coupling DC coupling

Voltage ranges 4.25 V and 42 V

Termination

cteristics

Terminate output into 50 Ω

8 P6250 & P6251 Technical Reference

Probe Tip Adapte

r Specifications

Probe Tip Adap

This section describes the characteristics of the adapters that are included in your accessory kit. The adapters are listed
in order of performance, beginning with the fastest. You will obtain the best probe performance by connecting the probe
directly to square pins on your circuit. However, as test points are not always as convenient, these adapters m ake taking
measurements easier while maintaining the best signal fidelity.

NOTE. All adapter specifications are typical unless otherwise indicated.

Straight Pins

Tektr o nix p a

Bandwidth: >

10/90 Rise ti

Best overall

rt number: 016-1891-xx

1.0 GHz

me: <350 ps

signal fidelity of the available adapters.

ter Specifications

P6250 & P6251 Technical Reference 9

Probe Tip Adapte

Longhorn Adapter

Tektronix part number: 016-1780-xx

Bandwidth: >1.0 GHz

10/90 Rise time: <350 ps

This adapter has sharp, adjustable pins that can span up to 0.35 inch apart. They are useful for probing small circuit
board features such as vias and narrow traces.

rSpecifications

10 P6250 & P6251 Technical Reference