Tektronix CT-2 User's Manual
Contents
1. CAT 1000 V DC peak AC lt 3 25 duty factor Signal Delay with P6041 Probe Cable Effect of Direct Current see Figures 6 and 7 Amp x Second Rating Pulse Current Rating RMS Current Rating Output Connector Approximately 2 8 ns measured from 50 points on leading edge of the current step and output voltage CT 1 Transformer only 0 4 ns Approximately 0 3 Apc increases decay by a factor of 2 1 amp usec When this product is exceeded the core saturates and the CT 1 output drops to zero 12 amps 0 5 amperes maximum Amphenol Sub Minax 27 3 Approximately 5 8 ns measured from 50 points on leading edge of the current step and output voltage CT 2 Transformer only 0 3 ns Approximately 0 3 Apc increases decay by a factor of 2 50 amp psec When this product is exceeded the core saturates and the CT 2 output drops to zero 36 amps 2 5 amperes maximum Amphenol Sub Minax 27 3 CT 1 CT 2 Current Transformer Specifications Table 2 General specifications CT 1 and CT 2 Environmental Meets all Class IV instrument specifications Operating Temperature Nonoperating Temperature Mechanical Dimensions 0 C to 55 62 C to 82 C Hole size CT 1 1 78 mm 0 070 in CT 2 1 32 mm 0 052 in 6 32 AR mm mounting O Connector 59 in stud 8 fee A 10 3 mm 0 406 in P6041 Probe cable length 106 68 mm 42 in Weight Certifications and com2. 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 a ae General Safety Summary To Avoid Fire or Personal Injury Symbols and Terms ZA ZA CT 1 CT 2 Current Transformer 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 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 Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service personnel Ground the Product To avoid electric shock the mounting stud must be connected to earth ground Do Not Operate in Wet Damp Conditions Do Not Operate in an Explosive Atmosphere Keep Product Surfaces Clean and Dry 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 t
3. 1972 Mfr Code to Manufacturer table titled Manufacturers Cross Index shows codes names and addresses Cross Index of manufacturers or vendors of components listed in the parts list 10 CT 1 CT 2 Current Transformer Replaceable Parts List Figure 8 CT 1 and CT 2 accessories Replaceable parts list Fig amp index Tektronix Serial no Serial no number number effective discont d 8 1 8 2 8 3 103 0028 00 8 4 011 0049 01 070 7957 XX Manufacturers cross index Mfr code Manufacturer 24931 BERG ELECTRONICS INC 80009 TEKTRONIX INC TK2548 XEROX CORPORATION CT 1 CT 2 Current Transformer Qty amp description n Recommended accessories Mfr code Mfr part number CURRENT TRANSFORMER CT 1 OR CT 2 WITH CT 1 OR CT 2 P6041 OPION 09 W O P6041 1 P6041 80009 P6041 1 ADAPTER CONN BNC FEMALE TO 24931 28A100 2 FEMALE 1 3L GOLD NICKEL 1 TERMN COAXIAL 50 OHM 2W BNC 80009 011 0049 01 1 MANUAL TECH CT1 CT2 PROBE DP TK2548 PER TEK DOCUMENTATION Address City state zip code BERG ELECTRONICS RF COAXIAL DIV FRANKLIN IN 46131 2100 EARLYWOOD DR PO BOX 547 14150 SW KARL BRAUN DR BEAVERTON OR 97077 0001 PO BOX 500 14181 SW MILLIKAN WAY BEAVERTON OR 97005 11 Replaceable Parts List 12 CT 1 CT 2 Current Transformer
4. Instructions Tektronix CT 1 CT 2 Current Transformer 070 7957 01 ce 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 Printed in the U S A Tektronix Inc Box 1000 Wilsonville OR 97070 1000 TEKTRONIX and TEK are registered trademarks of Tektronix Inc WARRANTY Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of one 1 year from the date of shipment If a 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 Tektronix will provide such service at Customer s site without charge during the warranty period if the service is performed within the normal on site service area Tektronix will provide on site service outside the normal on site service area only upon prior agreement and subject to payment of all travel expenses by Customer When or where on si
5. cuit Figure 4 shows a simplified circuit of the CT 1 and CT 2 Input circuit Ik 500 Figure 4 CT 1 and CT 2 simplified circuit CT 1 CT 2 Current Transformer 3 Specifications Table 1 Electrical characteristics Specification Sensitivity see Figures 2 and 3 Pulse Response Table 1 lists the electrical characteristics of the CT 1 and CT 2 Transformers when they are connected to the P6041 Probe cable The environmental and physical characteristics follow Tables 1 and 2 CT 1 with P6041 Probe 5 mV mA 3 into a 50 Q load Rise time lt 0 35 ns 10 to 90 Aberrations lt 5 as seen by a 1 GHz system CT 2 with P6041 Probe 1 mV mA 3 into a 50 Q load Rise time lt 0 5 ns 10 to 90 Aberrations 4 8 as seen by a 200 MHz system L R time constant Approximately 5 us Approximately 125 jus Insertion Impedance 50 Q termination 1 Q shunted by approxi mately 5 mH Unterminated 2 Q shunted by approximately 5 mH 50 Q termination 0 04 Q shunted by approximately 5 uH Unterminated 0 08 Q shunted by approxi mately 5 uH Frequency Response 25 kHz to 1 GHz 1 2 kHz to 200 MHz Turns Ratio 15 1 25 Capacitive Loading 14 bare wire typically 1 5 pF 16 bare wire typically 1 8 pF 20 bare wire typically 0 6 pF 22 bare wire typically 0 7 pF Maximum Bare Wire Voltage uninsulated 175 CAT 1000 V DC peak AC lt 3 25 duty factor 175 Vams
6. o this product or other property Symbols on the Product The following symbols may appear on the product A A m WARNING Protective Ground CAUTION Double High Voltage Earth Terminal Refer to Manual Insulated General Safety Summary ii CT 1 CT 2 Current Transformer Introduction CT 1 CT 2 Current Transformer The CT 1 and CT 2 are high frequency bidirectional current probes The CT 1 is a I GHz current probe and the CT 2 is a 200 MHz current probe Each current probe comes with a P6041 probe cable to allow you to connect directly to an oscilloscope to make measurements Tek CT 1 CURRENT TRANS Earth ground gt O P6041 Probe mounting stud connection 5mV mA INTO 500 Figure 1 CT 1 current probe The CT 1 and CT 2 are available as separately purchased units Option 09 See the Replaceable Parts List at the end of this manual for ordering information This manual provides information on four subjects m Description m Operation m Specifications m Replaceable Parts List PAS A Description The CF 1 1 GHz and CT 2 200 MHz are current probes designed for either permanent or temporary installation in the device under test DUT These probes are particularly useful for measuring high frequency currents in solid state circuitry with minimum circuit loading Due to bidirectional compatibility the CT 1 and CT 2 can be used to inject a signal or as an interstage transfo
7. ope input is not 50 Q use a suitable matching terminator see recommended accessories in the Replaceable Parts List Figure 5 shows the output of the CT 1 compared with the input pulse from a 250 ps fast rise pulse generator and the output of the CT 2 as seen by a 100 MHz oscilloscope system If the CT 1 or CT 2 is connected so that the positive label side faces the signal source the input current and output voltage will be in phase This is the preferred connection For pulses with a risetime slower than 1 ns the CT 1 or CT 2 may be connected in either polarity Ground and the voltage ratings do not apply when installed on a fully insulated conductor The 175 V rating is based on long term applications that may degrade the insulation The voltage on bare signal wire must be limited to the 175 Vgys and the 1000 V DC peak AC ratings Input current Output voltage Output voltage 100 mV div 20 ns div 100 mV div 2 ns div CT 1 output waveform CT 2 output waveform Figure 5 CT 1 and CT 2 output waveform 6 CT 1 CT 2 Current Transformer Operation Low Frequency Response CT 1 CT 2 Current Transformer The low frequency response of the current transformer is proportional to the inductance of the transformer windings A DC component in the current being measured tends to reduce this inductance Figures 2 and 3 show
8. ormer core from saturating When saturation occurs the output voltage falls to zero Probe Handling Only normal handling considerations are necessary with the CT 1 and CT 2 transformers They are sealed units and are not designed to be disassembled If the transformer or cable is damaged return it to Tektronix for replacement CAUTION Dropping the CT 1 or CT 2 transformer may break the probe Do not pull or stretch the P6041 cable or place objects on the cable This may damage the probe cable 8 CT 1 CT 2 Current Transformer A EE Replaceable Parts List This section contains a list of the replaceable parts for the CT 1 and CT 2 Use this list to identify and order replacement parts Parts Ordering Information Using the Replaceable CT 1 CT 2 Current Transformer Replacement parts are available through your local Tektronix field office or representative Changes to Tektronix products are sometimes made to accommodate improved components as they become available and to give you the benefit of the latest improvements Therefore when ordering parts it is important to include the following information in your order m Part number m Instrument type or model number m Instrument serial number m Instrument modification number if applicable If you order a part that has been replaced with a different or improved part your local Tektronix field office or representative will contact you concerning any change in part numbe
9. pliances EC Declaration of Conformity Low Voltage Installation Category Descriptions 15 gm 0 525 oz without P 6041 47 gm 1 655 oz with P6041 Compliance was demonstrated to the following specification as listed in the Official J ournal of the European Communities Low Voltage Directive 73 23 EEC as amended by 93 68 EEC EN 61010 1 1993 Safety requirements for electrical equipment for measurement control and laboratory use Terminals on this product may have different installation category designations The installation categories are CAT III Distribution level mains usually permanently connected Equipment at this level is typically in a fixed industrial location CAT Il Local level mains wall sockets Equipment at this level includes appliances portable tools and similar products Equipment is usually cord connected CATI Secondary signal level or battery operated circuits of electronic equipment CT 1 CT 2 Current Transformer NS A Operation This section describes how to install the CT 1 or CT 2 discusses low frequency probing and provides information on safety and product care Installing the CT 1 or CT 2 The CT 1 or CT 2 transformers can be attached to the chassis or circuit board to measure current in transistors diodes or other components Any number of transformers can be used When observing the output of a CT 1 or CT 2 transformer ensure it is terminated into 50 Q If the oscillosc
10. r Change information if any is located at the rear of this manual Parts List The tabular information in the Replaceable Parts List is arranged for quick retrieval Understanding the structure and features of the list will help you find all of the information you need for ordering replacement parts The following table describes the content of each column in the parts list Replaceable Parts List Parts list column descriptions 1 Figure amp index number Items in this section are referenced by figure and index numbers to the exploded view illustrations that follow 2 Tektronix part number Use this part number when ordering replacement parts from Tektronix 3and4 Serial number Column three indicates the serial number at which the part was first effective Column four indicates the serial number at which the part was discontinued No entries indicates the partis good for all serial numbers 5 This indicates the quantity of parts used 6 Name amp description An item name is separated from the description by a colon Because of space limitations an item name may sometimes appear as incomplete Use the U S Federal Catalog handbook H6 1 for further item name identification 7 Mfr code This indicates the code of the actual manufacturer of the part 8 Mfr part number This indicates the actual manufacturer s or vendor s part number Abbreviations Abbreviations conform to American National Standard ANSI Y1 1
11. rmer The probes inductively measure current through a conductor and develop a voltage proportional to the current For each mA of input current they output 5 mv 1 mv for CT 2 of signal when properly terminated Since the CT 1 and the CT 2 are dynamic current probes non DC the presence of DC current affects their performance Figures 2 and 3 show the influence of DC current on frequency response 0Apc 0 5 1 Apc 100 90 80 10 10k 100k 1M 10M 100M 1G Frequency Hz This response was obtained with the side of the CT 1 facing the signal source preferred connection above 800 MHz Figure 2 CT 1 frequency response vs DC current 2 CT 1 CT 2 Current Transformer Description 0Apc 0 5 1Apc 100 90 80 10 60 1k 10 k 100 k 1 10M 100 M Frequency Hz This response was obtained with the side of the CT 2 facing the signal source preferred connection Figure 3 CT 2 frequency response vs DC current The CT 1 and CT 2 consist of a current transformer and a flexible probe cable that attaches between the transformer and the oscilloscope In addition the CT 1 and CT 2 have an internal termination resistor that reduces reflections that allows the transformer to be disconnected from the probe cable and left in the cir
12. te service is not available 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 c to repair any damage or malfunction caused by the use of non Tektronix supplies or d 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 IN LIEU OF ANY OTHER WARRANTIES EXPRESS 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
13. this effect in the frequency domain This effect is also seen in the time domain Figure 6 shows that the pulse tilt is increased in the presence of significant DC current The DC current required to increase the tilt by a factor of two is about 0 3 A Pulse currents that start at zero and remain unidirectional have a DC component that the user should consider When droop is present at low frequencies the apparent overall peak to peak height from top to bottom is not the true current The height of a flat top pulse still can be measured accurately by observing the transition edge of the pulse In Figure 7 the 50 mA pulse is faithfully reproduced at the high to low transition at the center of the screen Pulse width tilt and the lower 3 dB frequency are related by the formula Percent tilt 2007 Tp f Where Tp pulse width f lower 3 dB frequency 10 mA div 20 us div i Output Input current voltage 0 3 Apc 1 Apc Figure 6 CT 1 decay characteristics referenced to front corner Operation 10 mA div 5 us div 0 ADC 0 4 Apc Input current Output voltage 0 4 Apc Figure 7 CT 2 decay characteristics referenced to transition Additional consideration needs to be given to the amp second rating of the transformer The product of the pulse current and the pulse duration should be less than the amp second rating to keep the transf
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