AC Current Probes
CT1 • CT2 • CT6
CT6. Current Probe.
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.
Features & Benefits
High Bandwidth
Ultra-low Inductance
Very Small Form Factor
Characterize Current Waveforms up to <200 pSec Rise Times
Very Low Loading of Circuit
Under Test
Fits Into Dense, Closely-spaced
Circuit Designs
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
AC Current Probes
CT1 • CT2 • CT6
CT1/CT2. Current Probes with P6041 BNC Probe Cable.
Extendible Probe Length
Specified rise time and bandwidth are
obtained when using the probe cables
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 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
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 same function
with Frequency and (Current-time
not be Characteristics.)
Rep-rate
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 Amps peak, with an Amp-Second Product of 50 x 10-6 Seconds (50 Ampmicroseconds), therefore the CT2 can safely handle a 36 Amp 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 rolloff 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.
2 Current Probes • www.tektronix.com/accessories
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