AC Probes Datasheet T_CT1 T CT1
TEK_CT2 TEK_CT2
User Manual: T_CT1
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AC Current Probes CT1 • CT2 • CT6 Datasheet Applications Data Storage Read Channel Design Silicon Characterization High-frequency Analog Design ESD Testing Signal Injection Differential Current Measurements Single-shot Low Rep-rate Pulse Measurements Propagation Delay Measurement CT6 Current Probe The CT6 is the newest addition to the Tektronix portfolio of high-frequency current probes. It is designed to meet the needs of high-speed circuit design and test applications which require ultra-high bandwidth, low inductance, and extremely small form factor. The CT6 provides up to 2 GHz bandwidth when used with high-bandwidth oscilloscopes such as the Tektronix TDS694C, TDS794D, and TDS7000 Series oscilloscopes or with other compatible 50 Ω input measuring instruments. Low inductance (<3 nH) assures that the loading effect of the CT6 on the circuit-under-test will be negligible, which is especially important for today's low-amplitude, high-speed circuit designs such as disk drive read/write preamplifiers. The probe is a closed-circuit design which will accept uninsulated wire sized up to 20 gauge. This product is exempt from CE mark by virtue of its 30 V voltage limit. CT6. Current Probe Features & Benefits High Bandwidth Ultra-low Inductance Very Small Form Factor Characterize Current Waveforms up to <200 ps Rise Times Very Low Loading of Circuit Under Test Fits Into Dense, Closely-spaced Circuit Designs CT1/CT2 Current Probes The CT1 and CT2 Current Probes are designed for permanent or semi-permanent in-circuit installation. Each probe consists of a current transformer and an interconnecting cable. The current transformers have a small hole through which a current carrying conductor is passed during circuit assembly. The P6041 Probe Cable provides the connection between the CT1 and CT2 Current Transformers and a BNC oscilloscope input. A 50 Ω termination is required to terminate the cable when connected to a high-impedance (1 MΩ) oscilloscope input. One probe cable can be used to monitor several current transformers that have been wired into a circuit. Datasheet conjunction with compatible high-bandwidth oscilloscopes and other instruments to observe and/or record high-frequency current waveforms. The CT1, CT2, and CT6 normally operate directly into 50 Ω scopes and other measuring device inputs. The CT1 or CT2 can be used with 1 MΩ input systems; use the P6041 probe cable and terminate the output with a 50 Ω feed-through termination (see Optional Accessories). In all cases, the CT1, CT2, and CT6 must work into 50 Ωs to obtain specified performance and sensitivity. Typical Measurement Applications CT1/CT2. Current Probes with P6041 BNC Probe Cable. Miniature Construction The CT1 and CT2 detachable cable design enables one or more probes to be located on circuit boards or in other limited space areas. The CT6 offers the smallest form factor available, for measurement on ever-shrinking circuit boards and components. It is designed for temporary installation and does not incorporate removable cables, as the CT1 and CT2 do. Extendible Probe Length Specified rise time and bandwidth are obtained when using the probe cables provided: The P6041 cable used with the CT1 and CT2 is 42 inches nominal. If additional length is required, the cables can be extended by using high-quality 50 Ω cable and suitable interface connectors. (Also see Special Probe Cables, Optional Accessories.) Long cables may degrade high-frequency response. High Sensitivity The CT1 and CT6 provide an output of 5 mV for each milliamp of input current when terminated in 50 Ω. The CT2 provides 1 mV per milliamp when terminated in 50 Ω. Typical Systems The CT1, CT2, and CT6 high-frequency current transformers are dynamic (i.e., non-DC) current measuring devices. They are typically used in 2 www.tektronix.com Differential Current Measurements Most true-differential voltage amplifiers have a maximum bandwidth of about 100 MHz. The CT1 or CT6 can make differential current measurements to 1 GHz and 2 GHz, respectively, by passing two wires carrying opposing currents through the same core. The displayed result is the difference current. The CT2 can perform the same function to 200 MHz. In all cases, Derating with Frequency and Amp-second Product (Current-time Product) guidelines should not be exceeded. (See Characteristics.) Single-shot and Low Rep-rate Pulse Measurements These common measurements are easy to make with the CT1, CT2, or CT6 provided that your signal fits within the Max Pulse Current and Amp-second Product (Current-time Product) guidelines for the specific current probe characteristics. For example, the CT2 is rated at 36 A peak, with an Amp-second Product of 50 × 10-6 seconds (50 Amp-microseconds), therefore the CT2 can safely handle a 36 A peak pulse with a maximum width of 1.39 microseconds or lower amplitude pulses for longer pulse widths. The CT1, CT2, and CT6 all have low-frequency roll-off characteristics. Low-frequency "droop" will exhibit itself when the pulse width approaches the L/R time constant of the specific transformer. Propagation Delay Measurements Two CT1 or CT2 Current Transformers with matching probe cables can be used to measure propagation delay (transit time) between the input and output currents of high-frequency devices. The probe outputs are connected to the inputs of dual-channel real-time or sampling scopes. Verification of any Probe/Cable/Scope System mismatch can be obtained by passing the same signal current through both probes and observing total system delay difference, if any. AC Current Probes — CT1 • CT2 • CT6 CT6 Typical Frequency Response. Characteristics CT1 Typical Frequency Response. CT2 Typical Frequency Response. CT1, CT2, and CT6 Characteristics Characteristic CT1 CT2 CT6 Bandwidth (typical) 25 kHz to 1 GHz 1.2 kHz to 200 MHz 250 kHz to 2 GHz Rise Time 350 ps 500 ps 200 ps Sensitivity 5 mV/mA 1 mV/mA 5 mV/mA (into 50 Ω) Accuracy ±3% ±3% ±3% Magnetizing 6 μH 7 μH 1 μH Inductance Leakage 2.4 nH 1 nH 1.5 nH Inductance Insertion Impedance: at 10 MHz <1 Ω 0.1 Ω 1.1 Ω at 100 MHz 2Ω 0.5 Ω 1.3 Ω at 1 GHz 11.9 Ω Max. Bare Wire #14 wire #16 wire #20 wire Size 1.78 mm (0.070 in.) 1.32 mm (0.052 in.) 0.8 mm (0.032 in.) Max. Bare Wire Voltage: RMS 175 VRMS CAT I 175 VRMS CAT I 30 VRMS CAT I Peak 30 V 1000 V*1 1000 V*1 175 V 175 V 30 V DC Max. Peak Pulse 12 A 36 A 6A Current 450 mA 2.5 A 120 mA Max. Continuous Current (RMS) Amp-second 50 × 10-6 A*Sec 0.25 × 10-6 A*Sec 1 × 10-6 A*Sec Product >6.35 μs >160 μs 0.4 μs L/R Time Constant (droop) Propagation Delay 5.4 ns 6.1 ns 5.2 ns NA UL3111-2-032, UL3111-2-032, Safety CSA1010.2.032, CSA1010.2.032, EN61010-2-032, EN61010-2-032, IEC61010-2-032 IEC61010-2-032 *1 (<3.25% Duty Factor). www.tektronix.com 3 Datasheet Contact Tektronix: ASEAN / Australasia (65) 6356 3900 Austria 00800 2255 4835* Balkans, Israel, South Africa and other ISE Countries +41 52 675 3777 Ordering Information Belgium 00800 2255 4835* Brazil +55 (11) 3759 7627 CT1 Canada 1 800 833 9200 High-frequency Current Probe. Includes: Manual and P6041 Interconnect Cable. Central East Europe and the Baltics +41 52 675 3777 Central Europe & Greece +41 52 675 3777 CT2 Denmark +45 80 88 1401 High-frequency Current Probe. Includes: Manual and P6041 Interconnect Cable. Finland +41 52 675 3777 France 00800 2255 4835* CT6 Germany 00800 2255 4835* High-frequency Current Probe. Hong Kong 400 820 5835 India 000 800 650 1835 Service Opt. Opt. Opt. Opt. Opt. Opt. Opt. Opt. Italy 00800 2255 4835* C3 – Calibration Service 3 Years C5 – Calibration Service 5 Years D1 – Calibration Data Report (CT6 only) D3 – Calibration Data Report 3 Years (with Opt. C3) D5 – Calibration Data Report 5 Years (with Opt. C5) R3 – Repair Service 3 Years R5 – Repair Service 5 Years SILV400 – Standard Warranty Extended to 5 Years (CT6 Only). Japan 81 (3) 6714 3010 Luxembourg +41 52 675 3777 Mexico, Central/South America & Caribbean 52 (55) 56 04 50 90 Middle East, Asia, and North Africa +41 52 675 3777 The Netherlands 00800 2255 4835* Norway 800 16098 People’s Republic of China 400 820 5835 Poland +41 52 675 3777 CT1 or CT2 Recommended Accessories Portugal 80 08 12370 Feed-through 50 Ω Termination – Order 011-0049-02. Republic of Korea 001 800 8255 2835 Russia & CIS +7 (495) 7484900 CT6 Standard Accessories South Africa +41 52 675 3777 SMA to BNC Adapter – Order 015-0572-xx. User Manual – Order 071-0453-xx. Color Cable Marker Bands – Probe Holder – Order 015-0682-xx. Certificate of Traceable Calibration – Warranty – One Year. Spain 00800 2255 4835* Sweden 00800 2255 4835* Switzerland 00800 2255 4835* Taiwan 886 (2) 2722 9622 United Kingdom & Ireland 00800 2255 4835* Tektronix is registered to ISO 9001 and ISO 14001 by SRI Quality System Registrar. USA 1 800 833 9200 * European toll-free number. If not accessible, call: +41 52 675 3777 Updated 10 February 2011 For Further Information. Tektronix maintains a comprehensive, constantly expanding collection of application notes, technical briefs and other resources to help engineers working on the cutting edge of technology. Please visit 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 supersedes that in all previously published material. Specification and price change privileges reserved. TEKTRONIX and TEK are registered trademarks of Tektronix, Inc. All other trade names referenced are the service marks, trademarks, or registered trademarks of their respective companies. 06 Dec 2013 www.tektronix.com 60W-12572-4
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