TEK P6021 Manual

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Instruction Manual

P6021 60 MHz Current Probe 070-0947-05

Warning The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to all safety summaries prior to performing service.

www.tektronix.com

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 and TEK are registered trademarks of Tektronix, Inc. LUBRIPLATE is a registered trademark of the Fiske Brothers Refining Co. POSIDRIV is a registered trademark of the Philips Screw Co.

WARRANTYTektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product. In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for packaging and shipping the defective product to the service center designated by 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. This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair damage resulting from improper use or connection to incompatible equipment; or c) to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product. THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

Table of ContentsGeneral Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Contacting Tektronix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operator Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

iii v vi 11 1 4

Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Warranted Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Typical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjustment Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

77 10 12 14 16 26

Replaceable Electrical Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Parts Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Using the Replaceable Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3131 31

Replaceable Mechanical Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Parts Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Using the Replaceable Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . .

3737 37

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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P6021 Instruction Manual

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Table of Contents

List of FiguresFigure 1: The P6021 Probe and Termination . . . . . . . . . . . . . . . . . . . . Figure 2: Insertion Impedance of the P6021 . . . . . . . . . . . . . . . . . . . . . Figure 3: Probe and Termination Input Current vs. Frequency Derating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 4: Typical P6021 Phase Response . . . . . . . . . . . . . . . . . . . . . . . Figure 5: P6021 Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 6: Connecting the Probe to the Calibration Fixture . . . . . . . . Figure 7: Location of Probe Adjustments . . . . . . . . . . . . . . . . . . . . . . . Figure 8: Location of Termination Adjustments . . . . . . . . . . . . . . . . . Figure 9: Disassembling the Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 10: P6021 Probe Component Location . . . . . . . . . . . . . . . . . . . Figure 11: P6021 Termination Component Location . . . . . . . . . . . . . . Figure 12: P6021 Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 5 9 11 13 18 19 20 27 35 35 41

List of TablesTable 1: Warranted Electrical Characteristics . . . . . . . . . . . . . . . . . . Table 2: Warranted Environmental Characteristics . . . . . . . . . . . . . . Table 3: Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 4: Certifications and Compliances . . . . . . . . . . . . . . . . . . . . . . . Table 5: Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 6: Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 7: Equipment List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 8 8 9 10 11 15

ii


General Safety SummaryReview 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.

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 source. Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings and markings on the product. Consult the product manual for further ratings information before making connections to the product. Connect the ground lead of the probe to earth ground only. Do not apply a potential to any terminal, including the common terminal, that exceeds the maximum rating of that terminal. Do Not Operate Without Covers. Do not operate this product with covers or panels removed. Avoid Exposed Circuitry. Do not touch exposed connections and components when power is present. Do Not Operate With Suspected Failures. If you suspect there is damage to this product, have it inspected by qualified service personnel. Do Not Operate in Wet/Damp Conditions. Do Not Operate in an Explosive Atmosphere. Keep Product Surfaces Clean and Dry.


iii

General Safety Summary

Symbols and Terms

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.

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

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. Symbols on the Product. The following symbols may appear on the product:

CAUTION Refer to Manual

Double Insulated

Protective Ground (Earth) Terminal

iv


Service Safety SummaryOnly 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 aid and resuscitation is present. To avoid electric shock, do not touch exposed connections.


v

Contacting Tektronix

Contacting TektronixPhone Address 1-800-833-9200* Tektronix, Inc. Department or name (if known) 14200 SW Karl Braun Drive P.O. Box 500 Beaverton, OR 97077 USA www.tektronix.com 1-800-833-9200, select option 1* 1-800-833-9200, select option 2* Email: [email protected] 1-800-833-9200, select option 3* 1-503-627-2400 6:00 a.m. 5:00 p.m. Pacific time * 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.

Web site Sales support Service support Technical support

vi


Operator InformationThank you for choosing a Tektronix current probe. This manual describes the P6021 current probe with passive termination and provides information about making measurements with the probe.

DescriptionThe P6021 current probe converts an alternating current waveform to a voltage that can be displayed and measured on an oscilloscope display. The probe provides accurate current measurements over a wide range of frequencies and allows you to measure current without breaking the circuit. The P6021 probe is compatible with general purpose oscilloscopes having a 1 MW input impedance. The P6021 probe comes with a passive termination that matches oscilloscope and probe impedance, optimizes the probe performance, and provides two sensitivity settings. In the standard configuration, the P6021 probe comes with a 5-foot cable and termination. The following option is also available. Option 03. 9-foot cable with termination

InstallationThis section describes both attaching the probe to an oscilloscope and using the standard accessories with the probe. To ensure the best performance from your probe and oscilloscope measurement system, check that the probe and oscilloscope are appropriately matched. The oscilloscope inputs should use BNC connectors and have an impedance of 1 MW. Figure 1 shows the probe and various parts referred to in this manual.


1

Operator Information

P6021 Probe

Termination

6" Ground Lead

Figure 1: The P6021 Probe and termination

Attaching the Probe and Termination to an Oscilloscope

Attach the probe to the termination as shown in Figure 1. An alligator-style ground clip is supplied to improve EMI rejection at high frequencies (2 MHz and above). Snap the ground lead to the probe transformer post and attach the alligator clip directly to RF ground. This will reduce ringing and help bypass capacitively-coupled RF currents that can flow into the probe cable. WARNING. To avoid injury or equipment damage, remove power from an uninsulated wire before clamping the current probe around it. When the probe slides are open, the exposed ferrite core pieces are not insulated. Also, never disconnect the probe from the termination when the probe is connected to a live conductor. To avoid damaging the probe, do not disconnect the probe termination and leave the P6021 clamped around the conductor when measuring high currents. Leaving the probe cable unterminated can cause a high voltage to develop in the secondary winding, which may damage the current probe transformer.

2



Using the Standard Accessories

Your P6021 is shipped with the following accessories:

H This instruction manual Read these instructions to familiarize yourselfwith the features, specifications, and operation of the P6021 current probe.

H 6-inch ground lead Use the 6-inch ground lead to ground the shieldaround the probe transformer at the probe end of the cable. This allows you to move the ground connection closer to the circuit that you are measuring, thereby improving high frequency response. The ground lead clips onto the ground connector on the bottom of the probe as shown. Please refer to the parts list in the section entitled Replaceable Mechanical Parts for part numbers.

Optional Accessories

Your P6021 may be used with the following optional accessory:

H CT-4 Current Probe The CT-4 is a robust clip-on transformer thatextends the current range of the P6021 up to 1000 amps (provided the amp-second rating is not exceeded). The CT-4 has receptacles for current probes in either 20:1 or 1000:1 step-down ratios.


3


Operating ConsiderationsThe information in this section will help you make effective use of your P6021 probe.

Features and Controls

H Sensitivity Control The P6021 termination has a control that allows youto select probe sensitivity. The switch has two positions: 2 mA/mV and 10 mA/mV. When the control is in the 2 mA/mV position, the oscilloscope displays 1 mV for every 2 mA of current in the circuit under test. When the control is in the 10 mA/mV position, the oscilloscope displays 1 mV for every 10 mA of current in the circuit under test.

Sensitivity control

You can set vertical scale on the oscilloscope to any scale factor, as determined by the signal amplitude. To calculate the overall vertical scale factor for the oscilloscope, probe, and termination, multiply the termination sensitivity control setting by the vertical scale factor of the oscilloscope. For example, if the termination control is set to the 10 mA/mV position and the oscilloscope to a vertical scale of 20 mV/division, the overall scale factor is 10 X 20, or 200 mA/division.

Open Closed Locked Probe slide switch Ridge

H Probe Slide Switch The slide switch on the probe has three positions:open, closed, and locked. Use your thumb to move the probe slide switch. The switch is spring loaded so that it automatically moves from the open to closed positions. To Use the Probe: a. Pull the slide switch toward you, and hold the switch in position. b. Place the conductor-under-test inside the exposed transformer core. The arrow on the transformer end of the probe indicates conventional current flow. If you place the probe on the conductor so that the arrow on the probe matches conventional current flow through the conductor, orientation of the displayed waveform will be correct. c. Release the switch, allowing the probe to close. d. Lock the slide switch. To lock the switch, push it firmly toward the transformer (the switch will move only about 1/8th inch). Locking the switch assures maximum contact between the two halves of the transformer secondary. The conductor now becomes the primary of the transformer. (When measuring current, always check that the probe slide switch is moved completely forward into the locked position.) WARNING. To prevent shock when measuring uninsulated conductors, keep your hands and fingers behind the ridge on the probe head.

4



Insertion Impedance

When you insert a conductor into the probe, you add impedance to the circuit you are measuring. This additional impedance affects signals; this is particularly important if you are measuring fast rise times. Figure 2 illustrates the equivalent circuit with the additional impedance introduced by the P6021.2.8

m

H

1.7 nH

.004

W

Figure 2: Insertion Impedance of the P6021

Minimizing Loading Effect

To minimize the loading effect of the probe, clamp it at the low or ground end of a component lead when possible. This method also minimizes noise or stray signal interference. You can increase the current sensitivity of the probe by increasing the number of times a conductor passes through it. For example, if the conductor loops through the probe twice (a two-turn primary winding), the secondary current is doubled. For example, suppose you set the termination sensitivity to 2 mA/mV and the oscilloscope vertical scale to 10 mV/division. Ordinarily, this would result in the equivalent of 2 X 10, or 20 mA/division. However, if the conductor is looped through the probe twice, the vertical scale is divided by two, resulting in the equivalent of 10 mA/division. Looping the conductor twice effectively doubles vertical sensitivity; however, impedance from the probe winding is also reflected into the circuit being measured. This impedance is proportional to the square of the number of loops. This additional impedance affects signals; this impedance is particularly important when you are measuring high-frequency current waveforms or waveforms with fast rise times.

Increasing Probe Sensitivity


5


Probe Shielding

The P6021 is shielded to minimize the effect of external magnetic fields. However, strong fields can interfere with the current signal being measured. If you suspect that an external field is interfering with your measurement, remove the probe from the conductor, but keep it in the same location as when you made the suspect measurement. If a signal still appears on the oscilloscope, try to measure the conductor current at a point farther from the location of the magnetic field. If you must measure current in the presence of a strong magnetic field, you can minimize its interference by using two current probes and a differential-input oscilloscope. To do so, follow these steps. 1. Connect the probes (with termination) to the positive and negative inputs of the oscilloscope. 2. Clamp one probe around the conductor whose current you want to measure. 3. Place the other probe as close as possible to the first. Ensure that its slide switch is completely closed, without a conductor inside it. 4. Set the oscilloscope to subtract the component of the signal that is common to both probes. 5. Adjust the positions of the probes for best results. It may be difficult to eliminate the undesirable signal completely, due to differences between the probes or their terminations.

Droop

The flat-top response of any AC current probe displays a certain amount of droop. This is caused by probe inductance loading the source impedance, causing an L/R exponential decay. For short pulse widths, the response looks nearly flat. The amount of droop can be calculated from the following relationship: % Droop = 200 (p) T f where: T=pulse duration in microseconds f=lower 3 dB frequency of probe in Hertz For example, to calculate the percent droop of a 100 ms pulse measured with a P6021 probe: In the 10 mA/mV position, f=120 Hz % Droop = 200 (p) T f = 200 (p) (100*106) (120) = 0.075%

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Service InformationWarranted CharacteristicsThis section lists the various warranted characteristics that describe the P6021 Current Probe. Included are warranted electrical and environmental characteristics. Warranted characteristics are described in terms of quantifiable performance limits which are warranted. The electrical characteristics listed in Table 1 apply under the following conditions:

H The probe and instrument must be in an environment whose limits aredescribed in Table 2. Table 1: Warranted electrical characteristicsCharacteristic Sensitivity Midband Accuracy System Bandwidth (with BW>200 MHz oscilloscope) 2 mA/mV 10 mA/mV Probe Rise Time Step Response 450 Hz to 60 MHz 120 Hz to 60 MHz 5.8 ns Because the oscilloscope input capacitance becomes a part of the termination network, the step response will vary with different oscilloscopes 10% peak-to-peak within 50 ns of step; 2% peak-to-peak thereafter Information 2 mA or 10 mA for each mV at oscilloscope input, selected by termination sensitivity control 3% at 10 kHz to 30 kHz

Aberrations (probe and termination at either sensitivity setting.)


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Service Information

Table 2: Warranted environmental characteristicsCharacteristic Temperature range Operating Nonoperating Altitude Operating Nonoperating To 2,000 m (6,561 ft),

TEK P6021 Manual

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