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
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.
CT1/CT2. Current Probes
with P6041 BNC Probe Cable.
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.
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 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 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.
Ordering Information
CT1
High-frequency
Current Probe.
Includes: Manual and P6041 Interconnect
Cable.
CT2
High-frequency Current Probe.
Includes: Manual and P6041 Interconnect Cable.
CT6
High-frequency Current Probe.
CT1 or CT2 Recommended
Accessories
Feed-through 50 Ω Termination - Order
011-0049-02.
Service
Opt. C3 - Calibration
Service 3 Years
Opt. C5 - Calibration Service 5 Years
Opt. D1 - Calibration Data Report (CT6 only)
Opt. D3 - Calibration Data Report 3 Years (with Opt. C3)
Opt. D5 - Calibration Data Report 5 Years (with Opt. C5)
Opt. R3 - Repair Service 3 Years
Opt. R5 - Repair Service 5 Years
CT6 Standard Accessories
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.
