Tektronix P6248 Instructions Manual
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Tektronix P6248 Instructions Manual

Tektronix P6248 Instructions Manual

1.7 ghz (typical) differential probe
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Instructions
P6248
1.7 GHz (Typical)
Differential Probe
071-0566-03

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  • Page 1 Instructions P6248 1.7 GHz (Typical) Differential Probe 071-0566-03...
  • Page 2 Copyright © Tektronix, Inc. All rights reserved. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved. Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077 TEKTRONIX, TEK, and TEKPROBE are registered trademarks of Tektronix, Inc.
  • Page 3 Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.

  • Page 5: Table Of Contents

    ......... Instruments with the TEKPROBE Interface (Tektronix TDS 400, 500, 600, and 700 Series Oscilloscopes) .
  • Page 6 ........Figure 10: Probe head and compensation box dimensions P6248 1.7 GHz Differential Probe Instructions...

  • Page 7: General Safety Summary

    Keep Product Surfaces Clean and Dry. Safety Terms and Symbols Terms in This Manual. These terms may appear in this manual: WARNING. Warning statements identify conditions or practices that could result in injury or loss of life. P6248 1.7 GHz Differential Probe Instructions...
  • Page 8 WARNING indicates an injury hazard not immediately accessible as you read the marking. CAUTION indicates a hazard to property including the product. Symbols on the Product. These symbols may appear on the product: Protective Ground CAUTION (Earth) Terminal Refer to Manual P6248 1.7 GHz Differential Probe Instructions...

  • Page 9: Preface

    This manual contains instructions and specifications for using the P6248 differential probe. Related Manuals For performance verification procedures, adjustment procedures, a list of replaceable parts, and other service information, refer to the P6248 Service Manual (071-0573-XX). P6248 1.7 GHz Differential Probe Instructions...

  • Page 10: Contacting Tektronix

    This phone number is toll free in North America. After office hours, please leave a voice mail message. Outside North America, contact a Tektronix sales office or distributor; see the Tektronix web site for a list of offices. P6248 1.7 GHz Differential Probe Instructions...

  • Page 11: Getting Started

    Getting Started The P6248 is a high-bandwidth differential probe with the TEK- PROBE interface. The P6248 probe has a bandwidth of 1.5 GHz (1.7 GHz typical). The probe has low circuit loading, high common- mode rejection, and comes with accessories that accommodate a wide variety of applications.
  • Page 12 Getting Started Table 1: P6248 features and standard accessories (Cont.) Feature/Accessory Description Input connections. The (+), (--), and ground connections of the Ground probe head accept the standard and optional probe accessories. You can also plug the head directly onto a pair of 0.025-inch square pins that have the standard spacing of 0.100-inch on...
  • Page 13 Getting Started Table 1: P6248 features and standard accessories (Cont.) Feature/Accessory Description Service manual. Provides procedures for verifying the performance, adjusting, and maintaining the P6248 differential probe. Replacement part number: 071-0573-XX Probe tip accessory kit. This kit contains the accessories listed below, in a plastic case.
  • Page 14 Getting Started Table 2 describes the contents of the probe tip accessory kit. Table 2: P6248 Probe tip accessory kit contents Accessory Description Color marker bands Color marker bands . Attach matching pairs of the color marker bands onto the cable at the head and compensation box of each probe.
  • Page 15 Getting Started Table 2: P6248 Probe tip accessory kit contents (Cont.) Accessory Description TwinTip adapter. This accessory provides two adjustable tips for probing connections that are close to each other. Replacement part number: 016-1786-00 (package of 4) Longhorn via adapter. This accessory is similar to the TwinTip adapter, but it has finer pins for probing smaller holes.
  • Page 16 Getting Started Table 2: P6248 Probe tip accessory kit contents (Cont.) Accessory Description Tip saver. Use the tip saver to prolong the life of your probe tip contacts. The tip saver connects to the probe and accepts the probe tip accessories, bearing the wear of repeated connections of different probe tips.
  • Page 17 55 Ω signal path and can be used in both single-ended and differential modes. Replacement part number: 679-5027-00 Micro KlipChip adapters. Use the adapters to probe the leads on integrated circuits that are surface-mounted. Replacement part number: SMK4 (package of 4) P6248 1.7 GHz Differential Probe Instructions...

  • Page 18: Installation

    Installation Before you connect the output of the P6248 differential probe, determine whether or not your oscilloscope has a TEKPROBE interface. See Figure 1. Figure 1: Input connector of TEKPROBE interface...

  • Page 19: Instruments With The Tekprobe Interface (Tektronix Tds 400, 500, 600, And 700 Series Oscilloscopes)

    NOTE. TDS 400 and TDS 400A series oscilloscopes do not interpret the scale factor coding of the P6248 differential probe. This problem is only apparent when the probe is in the ÷1 position. To correct for this problem, divide the measurement (or scale factor) by 10 when you use the probe in the ÷1 position.
  • Page 20 Getting Started P6248 1.7 GHz Differential Probe Instructions...

  • Page 21: Operating Basics

    CAUTION. To avoid damaging the inputs of the P6248 differential probe, do not apply more than ± 25 V (DC + peak AC) between each input and ground.

  • Page 22: Differential-Mode Signal Range

    In most applications, however, the common-mode impedance to ground is greater than the differential impedance. Hence, adding the probe ground lead does not improve the high-frequency performance of the measurement. P6248 1.7 GHz Differential Probe Instructions...

  • Page 23: Figure 2: Using The Short Ground Contact

    Figure 2 shows how to use the short ground contact. Figure 4 on page 15 shows the spring-loaded ground pin. Figure 2: Using the short ground contact P6248 1.7 GHz Differential Probe Instructions...

  • Page 24: Input Impedance And Probe Loading

    When you connect the probe inputs to a circuit, you are introducing a new resistance, capacitance, and inductance into the circuit. Each input of the P6248 differential probe has a characteristic input impedance of 100 kΩ to ground in parallel with less than 1 pF. See Figure 3.

  • Page 25: Common-Mode Rejection

    Common-Mode Rejection The common-mode rejection ratio (CMRR) is the specified ability of a P6248 differential probe to reject signals that are common to both inputs. More precisely, CMRR is the ratio of the differential gain to the common-mode gain. The higher the ratio, the greater the ability to reject common-mode signals.

  • Page 26: Figure 5: Using The Twinfoot Adapter

    Operating Basics IC pads being probed Conductive side Insulated side of probe tip of probe tip Figure 5: Using the TwinFoot adapter P6248 1.7 GHz Differential Probe Instructions...

  • Page 27: Reference

    Voltage that is common to both inputs is often referred to as the Common-Mode Voltage (V ) and voltage that is different as the Differential-Mode Voltage (V P6248 1.7 GHz Differential Probe Instructions...

  • Page 28: Common-Mode Rejection Ratio

    CMRR generally is highest (best) at DC and degrades with increasing frequency. Assessing CMRR Error Figure 8 on page 26 shows the CMRR of the P6248 differential probe. This derating chart assumes a common-mode signal that is sinusoidal. P6248 1.7 GHz Differential Probe Instructions...

  • Page 29: Input Impedance Effects On Cmrr

    CAUTION. To avoid damaging the input connectors, do not insert anything larger than a 0.025-inch square pin into the inputs. Use the tip saver accessory to preserve the integrity of the input connectors. P6248 1.7 GHz Differential Probe Instructions...

  • Page 30: Extending The Ground Lead

    50 Ω. If the measurement instrument does not support 50 Ω input termination, connect a 50 Ω coaxial terminator on the input. P6248 1.7 GHz Differential Probe Instructions...

  • Page 31: Effect Of Extending The Output Cable

    As the frequency of a signal increases, current flow concentrates at the outer edges of the conductor, effectively increasing the impedance. This effect is known as skin loss. The P6248 probe contains circuitry to compensate for skin loss. The compensation provides flat response with the probe cable.
  • Page 32 Reference P6248 1.7 GHz Differential Probe Instructions...

  • Page 33: Specifications

    Specifications The specifications in Tables 4 through 7 apply to a P6248 probe installed on a Tektronix TDS 694C oscilloscope. When the probe is used with another oscilloscope, the oscilloscope must have an input impedance of 50 Ω. 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 in Table 4.
  • Page 34 WARNING. To avoid a burn hazard at high ambient temperatures, do not touch the probe with bare hands at operating temperatures above + 50_ C or at nonoperating temperatures above + 70_ C. Allow sufficient time for the probe to cool before handling P6248 1.7 GHz Differential Probe Instructions...

  • Page 35: Typical Characteristics

    DC to ≥ 1.85 GHz (-- 3dB) @ ≤27_ C (÷10) Random noise < 50 nV Hz at 100 MHz Input impedance See Figure 9 ≤ ± 0.25 dB to the 3 dB bandwidth (devi- Pass band ripple ation from a nominal slope) P6248 1.7 GHz Differential Probe Instructions...

  • Page 36: Figure 8: Typical Common-Mode Rejection Ratio (B1 And B10 Attenuation)

    1 .25 G 1 .50 G 1 .75 G Frequency (Hz) Figure 9: Typical differential input impedance versus frequency The graph in Figure 9 represents simulation results of a first order model of the probe input. P6248 1.7 GHz Differential Probe Instructions...

  • Page 37: Figure 10: Probe Head And Compensation Box Dimensions

    Dimensions, output cable 1.2 m (47 in) Unit weight (probe only) 160 g (5.4 oz) 1.6 in .47 in 3.0 in .36 in 1.0 in 4.2 in Figure 10: Probe head and compensation box dimensions P6248 1.7 GHz Differential Probe Instructions...

  • Page 38: Nominal Characteristics

    Table 7: Nominal electrical characteristics Input configuration Differential (two inputs, + and -- ), with case ground Output coupling ÷1 and ÷10 Attenuation settings Terminate output into 50 Ω Termination P6248 1.7 GHz Differential Probe Instructions...

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