x
TCP0030A
120 MHz, 30 Amp AC/DC Current Probe
ZZZ
Instruction Manual
*P071300600*
071-3006-00
xx
TCP0030A
120 MHz, 30 Amp AC/DC Current Probe
ZZZ
Instruction Manual
www.tektronix.com
071-3006-00
Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are protected by
national copyright laws and international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all previously
published material. Specifications and price change privileges reserved.
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
Contacting Tektronix
Tektronix, Inc.
14150 SW Karl Braun Drive
P.O . B o x 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
In North America, call 1-800-833-9200.
Worldwide, visit www.tektronix.com to find contacts in your area.
Warranty
Tektronix 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. Parts, modules and replacement products used by Tektronix for
warranty work may be new or reconditioned to like new performance. All replaced parts, modules and products become the property of Tektronix.
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; 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 WITH RESPECT TO THE PRODUCT 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 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.
[W2 – 15AUG04]
Table of Contents
General safety summary .................................................................................................................... v
Service safety summary................................................................................................................... viii
Compliance Information .................................................................................................................... ix
Safety Compliance.................................................................................................................... ix
Environmental Considerations....................................................................................................... xiii
Preface..................................................................................................................................... xiv
Documentation....................................................................................................................... xiv
Conventions Used in this Manual ................................................................................................... xiv
Returning the Probe for Servicing ...................................................................................................xv
Key Features ............................................................................................................................... 1
Installation .................................................................................................................................. 2
Degauss the Probe ................................................................................................................... 3
Controls and Indicators..................................................................................................................... 5
Probe Slider and Conductor Jaw ..................................................................................................... 5
Control Box............................................................................................................................ 8
Functional Check . ......................................................................................................................... 17
Basic Operation............................................................................................................................ 18
Table of Contents
Application Examples...................................................................................................................... 20
Inductance Measurements . . ........................................................................................................ 21
TCP0030A Current Probe Instruction Manual i
Table of Contents
Probing Principles ......................................................................................................................... 26
Accessories and Options.................................................................................................................. 39
Specifications.............................................................................................................................. 45
Performance Verification .................................................................................................................. 53
Measuring Inductor Turns Count .................................................................................................... 24
Degaussing a Probe with an Unpowered Conductor in the Jaws .................................................................. 26
Measuring Differential Current....................................................................................................... 27
Extending Current Range. ........................................................................................................... 29
Increasing Sensitivity ................................................................................................................ 32
Common Mode Noise/Magnetic Field Errors........................................................................................ 33
AC and DC Coupling.................................................................................................................34
Maximum Current Limits............................................................................................................. 35
Optional Accessories ................................................................................................................ 41
Options............................................................................................................................... 44
Warranted Characteristics ........................................................................................................... 45
Typical Characteristics............................................................................................................... 46
Nominal Characteristics ............................................................................................................. 52
Equipment Required................................................................................................................. 54
Making the DC Current Loop ........................................................................................................ 55
Equipment Setup..................................................................................................................... 56
DC Gain Accuracy ................................................................................................................... 57
Rise Time and Bandwidth ........................................................................................................... 61
TestRecord .......................................................................................................................... 63
ii TCP0030A Current Probe Instruction Manual
Table of Contents
Adjustments................................................................................................................................ 64
Equipment Required ................................................................................................................. 64
Equipment Setup..................................................................................................................... 64
DC Gain Accuracy ................................................................................................................... 65
High Frequency Response .. ........................................................................................................ 67
Maintenance . . . ............................................................................................................................ 68
Troubleshooting...................................................................................................................... 68
Cleaning.............................................................................................................................. 70
Index
TCP0030A Current Probe Instruction Manual iii
Table of Contents
iv TCP0030A Current Probe Instruction Manual
General safety summary
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.
Only qualified personnel should perform service procedures.
To avoid fire or personal injury
General safety summary
Connect and disconnect properly.
source.
Connect and disconnect properly.
Connect and disconnect properly.
circuit under test. Connect the probe reference lead to the circuit under test before connecting the probe input. Disconnect the probe
input and the probe reference lead from the circuit under test before disconnecting the probe from the measurement instrument.
Observe all terminal ratings.
manual for further ratings information before making connections to the product.
Do not connect a current probe to any wire that carries voltages above the current probe voltage rating.
Do not operate without covers.
Do not operate with suspected failures.
service personnel.
Avoid exposed circuitry.
TCP0030A Current Probe Instruction Manual v
Do not touch exposed connections and components when power is present.
Do not connect or disconnect probes or test leads while they are connected to a voltage
De-energize the circuit under test before connecting or disconnecting the current probe.
Connect the probe output to the measurement instrument before connecting the probe to the
To avoid fire or shock hazard, observe all ratings and markings on the product. Consult the product
Do not operate this product with covers or panels removed.
If you suspect that there is damage to this product, have it inspected by qualified
General safety summary
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.
CAUTION.
Warning statements identify conditions or practices that could result in injury or loss of life.
Caution statements identify conditions or practices that could result in damage to this product or other property.
Symbols and 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.
vi TCP0030A Current Probe Instruction Manual
The following symbol(s) may appear on the product:
General safety summary
TCP0030A Current Probe Instruction Manual vii
Service safety summary
Servicesafetysummary
Only qualified personnel should perform service procedures. Read this
before performing any service procedures.
Do not service alone.
first aid and resuscitation is present.
Disconnect power.
power.
Use care when servicing with power on.
battery (if applicable), and disconnect test leads before removing protective panels, soldering, or replacing components.
To avoid electric shock, do not touch exposed connections.
Do not perform internal service or adjustments of this product unless another person capable of rendering
To avoid electric shock, switch off the instrument power, then disconnect the power cord from the mains
Dangerous voltages or currents may exist in this product. Disconnect power, remove
Service safety summary
General safety summary
and the
viii TCP0030A Current Probe Instruction Manual
Compliance Information
This section lists the EMC (electromagnetic compliance), safety, and environmental standards with which the instrument complies.
Safety Compliance
EC Declaration of Conformity – Low Voltage
Compliance was demonstrated to the following specification as listed in the Official Journal of the European Communities:
Low Voltage Directive 2006/95/EC.
EN 61010-1: 2001. Safety requirements for electrical equipment for measurement control and laboratory use.
EN 61010-2-032: 2002. Particular requirements for handheld current clamps for electrical measurement and test equipment.
U.S. Nationally Recognized Testing Laboratory Listing
UL 61010-1:2004, 2ndEdition. Standard for electrical measuring and test equipment.
IEC 61010-2-032:2002. Particular requirements for handheld current clamps for electrical measurement and test equipment.
Compliance Information
TCP0030A Current Probe Instruction Manual ix
Compliance Information
Canadian Certification
CAN/CSA-C22.2 No. 61010-1:2004. Safety requirements for electrical equipment for measurement, control, and laboratory
use. Part 1.
CAN/CSA-C22.2 No. 61010-2-032-04, 2ndEdition. Particular requirements for handheld and hand-manipulated current
sensors for electrical measurement and test equipment.
Additional Compliances
IEC 61010-1: 2001. Safety requirements for electrical equipment for measurement, control, and laboratory use.
IEC 61010-031: 2002. Particular requirements for handheld probe assemblies for electrical measurement and test equipment.
IEC 61010-2-032: 2002. Particular requirements for handheld current clamps for electrical measurement and test equipment.
Equipment Type
Test and measuring equipment.
x TCP0030A Current Probe Instruction Manual
Compliance Information
Pollution Degree Description
A measure of the contaminants that could occur in the environment around and within a product. Typically the internal environment
inside a product is considered to be the same as the external. Products should be used only in the environment for which they
are rated.
Pollution Degree 1. No pollution or only dry, nonconductive pollution occurs. Products in this category are generally
encapsulated, hermetically sealed, or located in clean rooms.
Pollution Degree 2. Normally only dry, nonconductive pollution occurs. Occasionally a temporary conductivity that is caused by
condensation must be expected. This location is a typical office/home environment. Temporary condensation occurs only
when the product is out of service.
Pollution Degree 3. Conductive pollution, or dry, nonconductive pollution that becomes conductive due to condensation. These
are sheltered locations where neither temperature nor humidity is controlled. The area is protected from direct sunshine,
rain, or direct wind.
Pollution Degree 4. Pollution that generates persistent conductivity through conductive dust, rain, or snow. Typical outdoor
locations.
Pollution Degree
Pollution Degree 2 (as defined in IEC 61010-1). Note: Rated for indoor use only.
Installation (Overvoltage) Category Descriptions
Terminals on this product may have different installation (overvoltage) category designations. The installation categories are:
TCP0030A Current Probe Instruction Manual xi
Compliance Information
Measurement Category IV. For measurements performed at the source of low-voltage installation.
Measurement Category III. For measurements performed in the building installation.
Measurement Category II. For measurements performed on circuits directly connected to the low-voltage installation.
Measurement Category I. For measurements performed on circuits not directly connected to MAINS.
Overvoltage Category
Overvoltage Category II (as defined in IEC 61010-1)
xii TCP0030A Current Probe Instruction Manual
Environmental Considerations
This section provides information about the environmental impact of the product.
Product End-of-Life Handling
Observe the following guidelines when recycling an instrument or component:
Compliance Information
Equipment recycling.
contain substances that could be harmful to the environment or human health if improperly handled at the product’s end of life. To
avoid release of such substances into the environment and to reduce the use of natural resources, we encourage you to recycle this
product in an appropriate system that will ensure that most of the materials are reused or recycled appropriately.
This symbol indicates that this product complies with the applicable European Union requirements according to
Directives 2002/96/EC and 2006/66/EC on waste electrical and electronic equipment (WEEE) and batteries.
For information about recycling options, check the Support/Service section of the Tektronix Web site
(www.tektronix.com).
TCP0030A Current Probe Instruction Manual xiii
Production of this equipment required the extraction and use of natural resources. The equipment may
Preface
Preface
This manual describes the installation and operation of the TCP0030A current probe. Basic probe operations and concepts are
presented in this manual. You can also access the Tektronix Web site for this document and other related information.
Documentation
To read about Use these documents
TCP0030A Probe: First Time Operation, Functional Check,
Operating Basics, Specifications, Performance Verification
In-depth oscilloscope operation, user interface help, GPIB
commands
*
To access the documentation that is installed on your instrument, click
Read this Instruction Manual.
Access the online help from the Help menu on the host
instrument.
in the taskbar and select
Start
*
Programs > TekApplications
.
Conventions Used in this Manual
The following icon is used throughout this manual to indicate a step sequence.
xiv TCP0030A Current Probe Instruction Manual
Returning the Probe for Servicing
If your probe requires servicing, you must return the probe to Tektronix. If the original packaging is unfit for use or not available, use
the following packaging guidelines:
Preparation for Shipment
Use a corrugated cardboard shipping
1.
carton having inside dimensions at
least one inch greater than the probe
dimensions. The box should have a carton
test strength of at least 200 pounds.
Put the probe into an antistatic bag or wrap
2.
it to protect it from dampness.
Place the probe into the box and stabilize it
3.
with light packing material.
Seal the carton with shipping tape.
4.
Preface
Refer to
5.
beginning of this manual for the shipping
address.
TCP0030A Current Probe Instruction Manual xv
Contacting Tektronix
at the
Preface
xvi TCP0030A Current Probe Instruction Manual
Key Features
You can use the TCP0030A current probe to make accurate measurements from DC to 120 MHz. The probe combines proven
Hall-effect technology with the Tektronix TekVPI oscilloscope interface. Key features include:
>120 MHz bandwidth, <2.92 ns rise time
AC/DC Measurement capability
50 A peak pulse current (pulse widths
<10 μs)
5 A and 30 A range settings
1 mA sensitivity (on TekVPI oscilloscopes
that support the 1 mV/div setting)
1% DC Accuracy (typical)
One-button degauss/autozeroing
Probe control through the TekVPI
oscilloscope menus or remotely through
the oscilloscope
Direct scaling and unit readout on host
instruments
Key Features
AC coupling (on TekVPI oscilloscopes that
support AC coupling)
TCP0030A Current Probe Instruction Manual 1
Installation
Installation
CAUTION.
changes in ambient conditions. Do not insert conductors larger than 5.0 mm (0.20 in) diameter into the probe jaw. Damage to
the probe may result.
The probe head is a precision assembly. Do not drop the probe or subject it to physical shock, strain, or sudden
Connect to the Host Instrument
Slide the probe into the TekVPI receptacle.
1.
The probe snaps in when fully engaged.
To disconnect, press the latch button and
2.
pull the probe away from the instrument.
When the probe is connected, the host
instrument reads information from the probe
and identifies the device. All of the probe LEDs
light briefly for a quick visual check.
2 TCP0030A Current Probe Instruction Manual
Degauss the Probe
After the probe is identified by the host
1.
instrument, the screen display prompts you
to run a degauss routine.
The multicolor Degauss/AutoZero status
LED on the probe also indicates that a
degauss is needed, by flashing red.
To degauss the probe, firstverifythatthe
2.
probe jaw is closed, and then press the
Degauss/AutoZero
or in the Degauss window on the host
instrument.
The DC gain and offset errors are not
NOTE.
guaranteed when this LED flashes red.
The multicolor Degauss/AutoZero status
3.
LED glows green to indicate a successful
degauss routine was run, and that the
probe is in normal operating mode.
Installation
button on the probe
TCP0030A Current Probe Instruction Manual 3
Installation
Quick Tip
To maintain measurement accuracy, degauss
your probe in each of these cases:
After you turn on the measurement system
and allow a 20-minute warm-up period
Before you connect the probe to a
conductor
Whenever a current or thermal overload
condition occurs
Whenever you subject the probe to a
strong external magnetic field
4 TCP0030A Current Probe Instruction Manual
Controls and Indicators
Probe Slider and Conductor Jaw
When the slider is in the locked position,
1.
you can degauss the probe and take
measurements.
Move the slider to the unlocked position to
2.
insert and remove conductors to and from
the conductor jaw.
The jaw can accept a 5 mm (0.2 in)
3.
diameter maximum conductor size.
WARNING.
force conductors larger than 5 mm (0.2 in)
diameter into the jaw.
To prevent probe damage, do not
Controls and Indicators
TCP0030A Current Probe Instruction Manual 5
Controls and Indicators
Safe handling zone – keep fingers behind
4.
demarcations when taking measurements.
WARNING.
access the area beyond the safe handling zone
(indicated by the shaded area) when you take
measurements.
To avoid electrical shock, do not
WARNING.
To prevent probe damage, do not
drop the probe or subject it to impact.
WARNING.
Do not connect the current probe
to any wire that carries voltages or currents that
exceed the rating of the probes.
6 TCP0030A Current Probe Instruction Manual
Ground Lead
Use the ground lead to improve EMI rejection at high frequencies.
Clip the ground lead to the ground post at
1.
the bottom of the probe head.
Connect the alligator end of the clip to the
2.
circuit ground.
Clamp the probe around the circuit
3.
conductor.
Controls and Indicators
TCP0030A Current Probe Instruction Manual 7
Controls and Indicators
Control Box
The probe function buttons and LED status
indicators are located on the top of the control
box, and are described in the following pages.
When the probe is first plugged in, all of
the indicator LEDs light briefly, and then the
Degauss/AutoZero LED flashes to alert you to
degauss the probe.
One of the Range LEDs remains lit to indicate
the current range selected.
Theprobewillretaintherangestate
NOTE.
and will restore it when it is power cycled.
The Jaw Open LED will also remain lit if the
probe slider is unlocked.
8 TCP0030A Current Probe Instruction Manual
Jaw Open LED
If the Jaw Open LED glows, the probe
1.
slider is unlocked.
Close the probe slider to accurately
2.
measure current or to degauss the probe.
CAUTION.
than 5.0 mm (0.20 in) diameter. Damage to the
probe jaws may result.
Do not measure conductors larger
Controls and Indicators
TCP0030A Current Probe Instruction Manual 9
Controls and Indicators
Overload LED
The multicolor Overload LED alerts you that
the probe specifications are being exceeded.
When the LED:
Glows red, the maximum input continuous
current limit has been exceeded
Glows orange, the safe operating
temperature of the probe has been
exceeded
Flashes red and orange, both the maximum
input continuous current limit and the safe
operating temperature of the probe have
been exceeded
CAUTION.
conditions that cause the Overload LED to light
for extended periods.
Quick Tip
An input current overload can magnetize
the probe. Always degauss the probe after
an overload.
Do not subject the probe to
10 TCP0030A Current Probe Instruction Manual
Range Button
Controls and Indicators
Press the
5 A and 30 A current range settings.
The green LEDs indicate the range selected.
The range and units are also displayed on the
oscilloscope screen.
button to select between the
Range
TCP0030A Current Probe Instruction Manual 11
Controls and Indicators
Degauss/AutoZero
When the multicolor Degauss/AutoZero status
LED flashes red, you must degauss the probe.
If the LED flashes orange, you should degauss
the probe. The DC gain and offset errors are
not guaranteed when this LED flashes orange.
The Degauss/AutoZero function also clears
(AutoZeroes) any DC offset in the probe.
To degauss the probe, do the following:
Disconnect the probe from the current
1.
source and then close the slider.
Press the
2.
initiate the degauss routine.
The LED glows green after successfully
completing the Degauss/AutoZero routine.
12 TCP0030A Current Probe Instruction Manual
Degauss/AutoZero
button to
Menu Button
Press the Menu button on the TCP0030A probe
to access additional probe functions, such as
probe offset and deskew.
The following menus may appear on the
oscilloscope screen, depending on the model.
An MSO/DPO4000 series oscilloscope is used
in this example.
Controls and Indicators
Press the
1.
The lower-bezel menu appears at
the bottom of the screen, above the
lower-bezel buttons.
Press the
2.
to scroll through the lower-bezel menu.
As each lower-bezel menu item is
3.
highlighted, a side-bezel menu appears
for that function, next to the right-bezel
buttons. The Probe Setup menu is shown
here.
Press the probe
4.
close the menu.
TCP0030A Current Probe Instruction Manual 13
button on the probe.
Menu
button on the oscilloscope
More
button again to
Menu
Controls and Indicators
Menu-Driven Probe Functions
The following probe functions are available through menu screens on many Tektronix oscilloscopes. An MSO/DPO4000 series
oscilloscope is used in these examples.
Fine Scale.
adjust the vertical mA/div setting to a custom
scale that is between the fixed 1–2–5 scales
on many oscilloscopes.
For example, to display a 320 mA signal over
exactly 8 vertical divisions (40 mA/div), first
set the fixed scale to 50 mA/div. Next, select
Fine Scale from the lower-bezel menu and
then use the Multipurpose knob to adjust the
Fine Scale down to 40 mA/div, as displayed
on-screen.
Offset and Position.
selections allow you to adjust that parameter
and to return the value to zero by pressing
a side-bezel button.
14 TCP0030A Current Probe Instruction Manual
This feature allows you to
Each of these
Controls and Indicators
Probe Setup.
displays probe settings and functional buttons.
Use the side-bezel buttons to initiate routines
such as Degauss and Deskew. The buttons
also display the degauss status of the probe.
The Probe Setup menu
TCP0030A Current Probe Instruction Manual 15
Controls and Indicators
Deskew.
other probes, select this function and connect
the probes to the optional deskew fixture. (See
page 43,
The deskew procedure measures the
channel-to-channel delay time, including the
probes, and provides manual and automatic
steps to align the delay (skew). Refer to
your oscilloscope manual or deskew fixture
documentation for instructions.
To deskew the TCP0030A probe to
Deskew/Calibration Fixture
.)
16 TCP0030A Current Probe Instruction Manual
Functional Check
The following procedure checks that your probe is functioning properly. To verify that your probe meets the warranted specifications,
refer to the
Performance Verification
Functional Check
procedures. (See page 53.)
CAUTION.
conductors larger than 5 mm (0.20 in) diameter into the probe jaw. Damage to the probe may result.
To check that your probe functions correctly,
do the following:
1.
2.
3.
4.
5.
TCP0030A Current Probe Instruction Manual 17
The probe jaw opening accommodates insulated conductors with a diameter of 5 mm (0.20 in) or less. Do not insert
Connect the probe to any channel of the
oscilloscope.
Set the oscilloscope to display the probe
channel.
Press the Degauss/AutoZero button.
Clamp the probe to your circuit.
Adjust the oscilloscope or use the Autoset
function to display a stable waveform.
When you see a stable waveform, your
probe is functioning correctly.
Basic Operation
Basic Operation
CAUTION.
The mating surfaces of the probe head transformer are precision-polished and should be handled with care. Measurements may
be degraded by dirt on the mating surfaces of the probe head transformer. Refer to the Maintenance section of this manual for
information on how to properly clean the probe head transformer surfaces.
1.
2.
3.
Do not force conductors larger than 5.0 mm (0.20 in) diameter into the probe jaws. Damage to the probe may result.
Check the oscilloscope display before
connecting the probe to a conductor.
If there is a DC offset, degauss the probe.
(See page 3,
Close and lock the probe jaw over the
conductor.
For correct polarity reading, connect the
probe so that the current flow, from positive
to negative, is aligned with the arrow on
the probe jaw.
Read the measurement on the oscilloscope
display.
Degauss the Probe
.)
18 TCP0030A Current Probe Instruction Manual
Basic Operation
Grounding the Probe
The 6-inch ground lead grounds the shield around the probe transformer at the probe end of the cable. This allows you to move the
ground connection closer to the circuit you are measuring, thereby improving high frequency response.
When you take high frequency measurements,
connect the probe ground lead to the probe
ground connector and attach the alligator clip
directly to RF ground to improve EMI rejection.
In some cases, it may be helpful to move the
ground lead or reposition the probe away from
noise sources in the circuit under test.
Clip the ground lead to the ground post at
1.
the bottom of the probe head.
Connect the alligator end of the clip to the
2.
circuit ground.
Clamp the probe around the circuit
3.
conductor.
TCP0030A Current Probe Instruction Manual 19
Application Examples
Application Examples
This section explains ways to use your probe in common troubleshooting tasks and how to extend the use of your measurement
system.
20 TCP0030A Current Probe Instruction Manual
Inductance Measurements
You can use the current probe to measure the inductance of coils that have either a low-impedance or high-impedance pulse
source of a known value.
Low-Impedance Pulse Sources
This figure shows a constant-voltage pulse
generator of extremely low output impedance
connected to an inductor that has low
resistance.
Connect the inductor across the output
1.
terminals of the pulse generator.
Maintain a constant voltage across the
2.
inductor.
Clamp the current probe over one of the
3.
source leads.
If the probe impedance is a significant
NOTE.
part of the total circuit inductance, measurement
accuracy will be affected. Refer to the probe
specifications for probe insertion impedance.
Application Examples
TCP0030A Current Probe Instruction Manual 21
Application Examples
Measure the current ramp. The inductance
4.
is effectively defined by the slope of the
current ramp shown here.
Calculate the inductance using the
5.
following formula:
where:
L
is the inductance in henries,
E
is the voltage of the pulse generator,
dt
is the change in time, and
di
is the change in current.
22 TCP0030A Current Probe Instruction Manual
High-Impedance Pulse Sources
If the pulse source has a higher impedance of
known resistance, such that the output voltage
drops as the current increases, the inductance
of a coil can be calculated by the time constant
of the charge curve.
The current ramp shows how the values for the
inductance formula are obtained.
Use this formula to calculate the inductance
based on the current measurement:
where:
L
is the inductance in henries,
τ
is the time required for the current to rise
or fall 63.2% of the total current value, and
R
is the source resistance of the pulse
generator.
Application Examples
TCP0030A Current Probe Instruction Manual 23
Application Examples
Measuring Inductor Turns Count
To obtain an approximate turns count of an
inductor, do the following:
Connect the inductor to a current limited
1.
source, as shown.
Measure the input current on one of the
2.
inductor leads.
Clamp the current probe around the
3.
inductor and note the current value.
The number of turns is equal to the ratio of coil
current to input current.
The accuracy of this method is limited by the
current measurement accuracy.
24 TCP0030A Current Probe Instruction Manual
For a more precise turns count, you need a
coil with a known number of turns to use as a
reference. Do the following:
Repeat steps 1 and 2 above and make the
1.
following changes:
Insert the reference coil into the current
2.
probe.
Insert the test coil into the current probe
3.
so that the currents oppose each other
as shown. You must observe the polarity
of coil current to determine whether the
test coil has less or more turns than the
reference coil. The turns are calculated by
using the formula:
where:
N
is the number of turns in the test coil,
2
N
is the number of turns in the reference
1
coil,
I
is the measured coil current, and
m
I
is the input current.
1
Application Examples
TCP0030A Current Probe Instruction Manual 25
Probing Principles
Probing Principles
The following information is provided to help you use the full potential of your current probe.
Degaussing a Probe with an Unpowered Conductor in the Jaws
You can degauss your current probe while a conductor of an unpowered circuit is clamped in the jaws. The advantage of
degaussing with an unpowered circuit is that any offset from stray DC magnetic fields is compensated. Degaussing with the
conductor in the probe jaws eliminates the need to manually remove the probe.
Be certain that the conductor in the probe jaws is completely unpowered. Any current flowing through the conductor will
NOTE.
cause a residual offset in the current probe and may cause an inaccurate measurement or an error condition.
The impedance of your circuit must be higher than 10 mΩ for the degauss procedure to work. (The probe core will not saturate with
a circuit impedance of less than 10 mΩ). While degauss occurs, the probe will induce approximately 50 mVp-p, into 50 Ω with a
frequency of 190 Hz. Your circuit must be able to absorb this induced voltage. With low impedance circuits, several amperes may
be induced in the circuit being measured. This may be of concern when you are using very small conductors.
26 TCP0030A Current Probe Instruction Manual
Measuring Differential Current
To simplify your differential or null current
measurements, you can place two conductors
in one current probe.
Probing Principles
WARNING.
either reduce the number of conductors you are measuring, or , if possible, take your measurement on a smaller conductor.
TCP0030A Current Probe Instruction Manual 27
Do not force the slide closed. Damage to the probe may result. If you cannot close the slide around the conductor(s),
Probing Principles
Orient the two conductors under test so
1.
that the polarities (+ and –) oppose each
other.
Clamp the current probe around the two
2.
conductors. Be careful not to pinch a
conductor in the probe jaws.
Measure the current.
3.
Conventional current flows from positive to
negative. A waveform above the baseline
indicates that the conductor with the
conventional current flow in the direction
of the probe arrow is carrying the greater
current.
28 TCP0030A Current Probe Instruction Manual
To adjust for a current null, adjust the
4.
current in one of the conductors until the
displayed measurement is zero.
Extending Current Range
If your measurement exceeds the maximum current rating of the connected probe, you can extend the AC and DC current ranges
without exceeding specified limits by using the following methods.
Probing Principles
WARNING.
applicable accessories. When using multiple conductors, do not exceed current limits on either conductor.
To avoid personal injury or equipment damage, do not exceed the specified electrical limits of the probe or any
Extending DC Range
If you want to measure a low-amplitude AC component that is superimposed on an extremely large steady-state DC component
(such as in a power supply), or if you want to extend the DC current range of your probe, you can add offset (bucking) current with
a second conductor.
TCP0030A Current Probe Instruction Manual 29
Probing Principles
WARNING.
Do not put more than one uninsulated conductor at a time in the probe jaws. An uninsulated conductor is any
conductor without insulation or without insulation rated for the voltage present on the conductor under test.
To supply additional bucking current:
Place a second conductor that has a pure
1.
DC component of known value in the probe
jaw with the conductor under test.
Orient the second conductor so that the
2.
bucking current flows in the opposite
direction of the DC flow in the conductor
under test.
To determine measurement values, add
3.
the value of the bucking current to the
displayed measurement.
Adding a second conductor to the probe increases the insertion impedance and reduces the upper bandwidth limit of the
NOTE.
probe. Winding multiple turns further increases the insertion impedance, further reducing the upper bandwidth limit.
30 TCP0030A Current Probe Instruction Manual
To increase the value of the bucking current:
Wind multiple turns of the second
1.
conductor around the probe.
The bucking current is equal to the current
flowing in the conductor, multiplied by the
number of turns wound around the probe.
For example, if the second conductor has a
current of 100 mA DC and is wrapped around
the probe five times, the DC bucking current is
100 mA multiplied by 5, or 500 mA DC.
Probing Principles
TCP0030A Current Probe Instruction Manual 31
Probing Principles
Increasing Sensitivity
If you are measuring DC or low-frequency
AC signals of very small amplitudes, you can
increase measurement sensitivity of your
current probe by doing the following:
Wind several turns of the conductor under
1.
test around the probe as shown. The
signal is multiplied by the number of turns
around the probe.
To obtain the actual current value, divide
2.
the displayed amplitude by the number of
turns.
For example, if a conductor is wrapped around
the probe three times and the oscilloscope
shows a reading of 3 mA DC, the actual current
flow is 3 mA divided by 3, or 1 mA DC.
Winding more turns around the probe increases the insertion impedance and reduces the upper bandwidth limit of the probe.
NOTE.
32 TCP0030A Current Probe Instruction Manual
Common Mode Noise/Magnetic Field Errors
Common-mode noise at high frequencies and
strong magnetic fields on the supply side of
your circuit can cause measurement errors. To
avoid this:
Measure on the low or ground side of your
1.
circuit.
Orient the probe to measure conventional
2.
current flow.
Probing Principles
TCP0030A Current Probe Instruction Manual 33
Probing Principles
AC and DC Coupling
You can couple the signal input to the oscilloscope with either DC or AC coupling. DC coupling shows both the DC and AC
measurement components. AC coupling removes the DC component from the displayed signal.
This low-frequency square wave is
1.
displayed using AC coupling. The signal
exhibits low-frequency rolloff.
Press the DC Coupling button to display
2.
the waveform as truly square.
CAUTION.
sure that the input DC current does not exceed
the probe specifications.
When you use AC coupling, make
34 TCP0030A Current Probe Instruction Manual
Maximum Current Limits
Current probes have three maximum current ratings: pulsed, continuous, and Ampere-second product. Exceeding any of these
ratings can saturate the probe core, which magnetizes the core and causes measurement errors. Refer to the specifications for the
maximum current ratings of the probe. (See Table 2 on page 46.)
Probing Principles
Maximum Pulsed Current (I
maxP
)isthe
maximum peak value of pulsed current the
probe can accurately measure, regardless
of how short (within bandwidth limitations)
the pulse duration is.
Maximum Continuous Current (I
maxC
)isthe
maximum current that can be continuously
measured at DC or at a specified AC
frequency. The maximum continuous
current value is derated with frequency;
as the frequency increases, the maximum
continuous current rating decreases.
TCP0030A Current Probe Instruction Manual 35
Probing Principles
Ampere-Second Product is the maximum
width of pulsed current that you can
measure when the pulse amplitude is
between the maximum continuous and
maximum pulsed current specifications.
The maximum continuous specification
varies by frequency.
To determine if your measurement exceeds
the Ampere-second product, you must first
determine the maximum allowable pulse width
or maximum allowable pulse amplitude, as
described in the following section.
NOTE.
current, or Ampere-second product rating of the probe. Exceeding these ratings can magnetize the probe and cause measurement
errors.
Always degauss the probe after measuring a current that exceeds the maximum continuous current, maximum pulsed
36 TCP0030A Current Probe Instruction Manual
Maximum Allowable Pulse Width
To determine the maximum allowable pulse
width do the following:
Measure the peak current of the pulse.
1.
Divide the Ampere-second (or
2.
Ampere-microsecond) specification
for the range setting of the TCP0030A
probe by the measured peak current of the
pulse:
The quotient is the maximum allowable
pulse width (PW
Check that the pulse width at the 50% point
3.
of the measured signal is less than the
calculated maximum allowable pulse width
).
(PW
max
max
).
Probing Principles
TCP0030A Current Probe Instruction Manual 37
Probing Principles
Maximum Allowable Pulse Amplitude
To determine the maximum allowable pulse
amplitude do the following:
Measure the pulse width at the 50% points.
1.
Divide the Ampere-second (or
2.
Ampere-microsecond) specification
for the range setting of the TCP0030A
probe by the pulse width.
The quotient is the maximum allowable
pulse amplitude; the peak amplitude of the
measured pulse must be less than this
value.
For example, the TCP0030A probe has a
maximum Ampere-second product of 500 A-μs
in the 30 A range setting. If a pulse measured
with the probe has a width of 11 μs, the
maximum allowable peak current would be
500 A-μs divided by 11 μs, or 45.5 A.
38 TCP0030A Current Probe Instruction Manual
Accessories and Options
This section lists the standard accessories and provides information on how to use the accessories. Specifications are provided
where appropriate so that you can choose the accessory that best fits your needs.
Probe Ground Lead
Fasten the small clip to the ground stub on
1.
the probe body.
Clip the alligator clip to your circuit.
2.
Attach the probe to your circuit.
3.
Reorder Tektronix part number 196-3521-xx,
qty. 1.
Accessories and Options
TCP0030A Current Probe Instruction Manual 39
Accessories and Options
Instruction Manual
The instruction manual provides operating and
maintenance instructions.
Reorder Tektronix part number: 071-3006-xx
Manuals in the languages listed below are
available for this product. Other languages may
also be available; check the Tektronix Web site
at www.tektronix.com/manuals.
Japanese
Simplified Chinese
40 TCP0030A Current Probe Instruction Manual
Optional Accessories
This section lists the optional accessories that are available for the probe.
Current Loop
Use the 1-turn, 50 Ω current loop for the
performance verification procedures. The
BNC connector allows for easy connections to
current sources.
To use the current loop, follow the procedure
for the specific task that you are performing.
Order Tektronix part number: 067-2396-xx
Accessories and Options
TCP0030A Current Probe Instruction Manual 41
Accessories and Options
TekVPI Calibration Fixture
This calibration fixture is required to complete
a performance verification and gain accuracy
adjustment procedures on the probe. It
provides power to the probe and routes the
probe output signal out through an SMA
connector on the back of the fixture. The signal
can then be measured with another instrument,
such as a precision DMM, to check and adjust
the gain accuracy of the probe.
Order Tektronix part number 067-1701-xx.
42 TCP0030A Current Probe Instruction Manual
Deskew/Calibration Fixture
Connect this fixture to host instruments that
support the probe calibration or deskew
procedures. The deskew procedures
compensate for gain errors and timing
differences between current and voltage
probes. Refer to your oscilloscope manual or
fixture documentation for instructions.
Reorder Tektronix part number: 067-1686-xx
Accessories and Options
TCP0030A Current Probe Instruction Manual 43
Accessories and Options
Options
Service Options
Option CA1.
Option C3.
Option C5.
Option D1.
Option D3.
Option D5.
Option R3.
Option R5.
44 TCP0030A Current Probe Instruction Manual
Provides coverage for a single Calibration Event
Calibration Service 3 years
Calibration Service 5 years
Calibration Data Report
Calibration Data Report, 3 years (with Option C3)
Calibration Data Report, 5 years (with Option C5)
Repair Service 3 years
Repair Service 5 years
Specifications
The specifications in the tables in this section are valid under the following conditions:
The probe has been calibrated at an ambient temperature of 23 °C ±5 °C.
The probe is connected to a host instrument with an input impedance of 1 MΩ.
The probe must have a warm-up period of at least 20 minutes and be in an environment that does not exceed the limits
described. (See Table 1).
Specifications for the TCP0030A current probe fall into three categories: warranted, typical, and nominal characteristics.
Warranted Characteristics
Warranted characteristics describe guaranteed performance within tolerance limits or certain type-tested requirements. Warranted
characteristics that have checks in the
Table 1: Warranted electrical characteristics
Characteristic Description
DC gain accuracy
Rise time (10% to 90%)
Bandwidth
Performance Verification
<3% (typical <1% at +23 °C, ±5 °C)
≤2.92 ns
DC to 120 MHz
section are marked with the
Specifications
symbol.
TCP0030A Current Probe Instruction Manual 45
Specifications
Typical Characteristics
Typical characteristics describe typical but not guaranteed performance.
Table 2: Typical electrical characteristics
Characteristic Description
Maximum continuous current – DC and
low frequency
Maximum peak current
Displayed RMS noise ≤75 μA RMS. (Limit measurement bandwidth to 20 MHz)
Insertion impedance
Signal delay
Maximum voltage on bare wire
Maximum Amp·Second product
5 A Range: 5 A RMS
30 A Range: 30 A RMS (42.4 A peak) (See Figure 3 on page 49.)
50 A maximum peak pulse (See Figure 3 on page 49.)
(See Figure 2 on page 48.)
~14.5 ns
150 V CAT II
5 A range: 50 A·μs
30 A range: 500 A·μs
46 TCP0030A Current Probe Instruction Manual
Figure 1: Frequency derating (peak current versus frequency)
Specifications
TCP0030A Current Probe Instruction Manual 47
Specifications
Figure 2: Typical input impedance versus frequency
48 TCP0030A Current Probe Instruction Manual
Figure 3: Maximum peak pulse versus pulse width
Specifications
TCP0030A Current Probe Instruction Manual 49
Specifications
Table 3: Environmental characteristics
Characteristic Description
Temperature
Humidity
Altitude
Table 4: Typical mechanical characteristics
Characteristic Description
Dimensions, compensation box
Dimensions, probe head
Dimensions, cable length
Unit weight
Operating: 0 to +50 °C (+32 to +122 °F)
Nonoperating: -40 to +75 °C (-40 to +167 °F)
Operating: 5-95% RH, tested up to +30 °C (+86 °F)
5-85% RH, tested at +30 °C to +50 °C (+86 °F to +122 °F)
Nonoperating: 5-95% RH, tested up to +30 °C (+86 °F)
5-85% RH, tested at +30 °C to +75 °C (+86 °F to +167 °F)
Operating: Up to 3000 meters (10,000 feet)
Nonoperating: Up to 12,192 meters (40,000 feet)
107 mm × 30.5 mm × 41 mm (4.2 in × 1.2 in × 1.6 in)
148.3 mm × 15.2 mm × 30.5 mm (5.8 in × 0.6 in × 1.2 in)
2 m (79 in) (from the probe head to the compensation box)
700 g (1.5 lbs) (probe, accessories, and packaging)
50 TCP0030A Current Probe Instruction Manual
Specifications
TCP0030A Current Probe Instruction Manual 51
Specifications
Nominal Characteristics
Nominal characteristics describe guaranteed traits, but the traits do not have tolerance limits.
Table 5: Nominal electrical characteristics
Characteristic Description
Input coupling
Current ranges
Termination
Compatibility Oscilloscopes equipped with the TekVPI interface
DC
5 A and 30 A
Terminate output into 1 MΩ
52 TCP0030A Current Probe Instruction Manual
Performance Verification
The procedures that follow verify the warranted specifications of the probe, listed below. The recommended calibration interval is
one year.
DC gain accuracy
Rise time
Bandwidth
Perform the following verification procedures in the order listed.
Performance Verification
TCP0030A Current Probe Instruction Manual 53
Performance Verification
Equipment Required
The equipment required for the performance verification procedure is listed below. (See Table 6.)
Table 6: Test equipment
Description and quantity Performance requirement Recommended example
Oscilloscope TekVPI interface, 500 MHz or greater bandwidth Tektronix DPO4000
High amplitude pulse generator Risetime <500 ps, pulse width >100 ns, amplitude
Calibrator DCV: 0.2% accuracy, 0 to ±1.5 V, square wave output
DMM
TekVPI Calibration/Verification
adapter
DC current loop 5 turns 18 AWG coated wire on 3 inch form See instructions that follow
HF current loop
Adapter
Adapter
BNC cable 50 Ω, 0.76 m (30 in) length
Test leads (2)
1
Nine-digit part numbers (xxx-xxxx-xx) are Tektronix part numbers.
Picosecond Labs 2600C
>10 Vpp into 50 Ω
Fluke 9100
ACA: 0.25% accuracy, 0 to ±6 A, square wave output
≥2 volt range, ≥1% accuracy
Keithley 2700
TekVPI interface 067-1701-xx (See page 42.)
50 Ω ±0.5%, BNC male
BNC-to-dual banana
SMA male-to-BNC female
067-2396-xx
103-0090-xx
015-1018-xx
012-0117-xx
Banana plug to clip leads Keithley 1681
1
54 TCP0030A Current Probe Instruction Manual
Making the DC Current Loop
Construct the loop using #18 coated wire and a cylindrical form approximately 3 inches in diameter:
exactly
Wind
1.
around the form.
Scrape about a half-inch of coating off of
2.
the ends of the wire.
5 turns of #18 coated wire
Performance Verification
Ensure that the current loop has exactly 5 turns. A significant error will result for each turn variance from 5 turns.
NOTE.
TCP0030A Current Probe Instruction Manual 55
Performance Verification
Equipment Setup
Use the following procedure to set up and warm up the equipment to test the probe.
Turn on the oscilloscope.
1.
Connect the probe to any channel (1–4) of
2.
the oscilloscope.
Close the probe slider and then press the
3.
Degauss/AutoZero button.
Set the oscilloscope coupling to DC.
4.
Power on the current source and the pulse
5.
generator.
Allow 20 minutes for the equipment to
6.
warm up.
Photocopy the test record and use it to
7.
record the test results. (See page 63.)
56 TCP0030A Current Probe Instruction Manual
DC Gain Accuracy
This test checks the DC gain accuracy of the probe. If the measurements are out of the specified limits in the test record, refer to
Adjustments
the
Connect a BNC-to-Dual Banana adapter to
1.
the digital multimeter (DMM) input.
Connect the SMA M-to-BNC F adapter
2.
to the SMA output of the TekVPI
Calibration/Verification adapter.
Connect the BNC cable between
3.
the BNC adapter on the TekVPI
Calibration/Verification adapter and the
BNC adapter attached to the DMM.
Connect the TekVPI Calibration/Verification
4.
adapter to any channel (1–4) of the
oscilloscope.
Connect the probe to the TekVPI
5.
Calibration/Verification adapter.
The adapter is only used to supply
NOTE.
power to the probe; measurements are taken
on the DMM.
section. (See page 64.)
Performance Verification
TCP0030A Current Probe Instruction Manual 57
Performance Verification
Do not clamp the current probe around any
6.
conductor, but make sure the jaw is in the
locked position.
Degauss the probe by pressing the
7.
Degauss/AutoZero button.
Connect the 5-turn current loop to the
8.
current source, and then clamp the current
probe around the current loop as shown.
The arrow indicator on the probe should
point away from the (+) terminal of the
current source.
58 TCP0030A Current Probe Instruction Manual
5 A Range Test
Set the current source output to +0.50 A
9.
DC.
Set the DMM to measure DC volts, on
10.
≥2 volt range (or use Autoset).
Set the probe to the 5 A range.
11.
Enable the output of the current source.
12.
Performance Verification
Test current = ±2.500 A (±0.50 A source output x 5 coil turns)
Expected output voltage (Ve) = 2.50 V
Record the exact measurement of the
13.
DMM as M1.
Set the current source output to -0.50 A.
14.
Record the exact measurement of the
15.
DMM as M2.
Compute the % Error using the measured
16.
amplitude values and the formula shown.
TCP0030A Current Probe Instruction Manual 59
Example:
Performance Verification
30 A Range Test
Set the current source output to +3.00 A.
17.
Set the probe to the 30 A range.
18.
Record the exact measurement of the
19.
DMM as M1.
Set the current source output to -3.00 A.
20.
Record the exact measurement of the
21.
DMM as M2.
Compute the % Error using the measured
22.
amplitude values and the formula shown.
Record the computed %Error values in the
23.
Test Re c or d .
Disable the calibrator output.
24.
Test current = ±15.00 A (±3.00 A source output x 5 coil turns)
Expected output voltage (Ve) = 1.50 V
60 TCP0030A Current Probe Instruction Manual
Rise Time and Bandwidth
This procedure verifies that the probe meets the rise time specification on both of the current ranges. The bandwidth of the
probe is then calculated using the measured probe rise time.
Connect the probe to any channel (1–4).
1.
Connect the BNC cable to the output of
2.
the pulse generator, using a BNC-to-SMA
adapter if necessary.
Connect the other end of the BNC cable to
3.
the HF current loop.
Set the pulse generator output and pulse
4.
width to maximum (0 dB, 100 ns duration).
Set the oscilloscope:
5.
Vertical sensitivity to 200 mA/div
Horizontal to 2 ns/div
Trigger at 50%
Averaging on (32)
Coupling to DC
Performance Verification
To measure Rise Time
TCP0030A Current Probe Instruction Manual 61
Performance Verification
Set the probe range to the 5 A setting.
6.
Degauss the probe.
7.
Clamp the current probe around the HF
8.
current loop. Verify that the arrow-shaped
indicator on the probe points away from the
pulse generator.
Record the rise time measurement in the
9.
Test Re c or d .
If the measured rise time is out of
NOTE.
tolerance, you may be able to readjust it. (See
page 64, Adjustments.)
Calculate the probe bandwidth using the
10.
measured rise time in the following formula:
Record the calculated bandwidth value in
11.
the test record.
Set the probe range to the 30 A setting and
12.
set the vertical sensitivity to 200 mA/div.
Remove the probe from the current loop
13.
and then repeat steps 7 through 11.
End of procedures.
62 TCP0030A Current Probe Instruction Manual
Test Record
Performance Verification
Probe Model/Serial Number:
Temperature:
Date of Calibration:
Performance
test
DC Gain
Accuracy
Range Test
5 A ±2.5 A ±2.50 V
30 A ±15 A ±1.50 V
5 A ~1 A <2.92 ns NA 2.92 nsRise time
30 A ~1 A <2.92 ns NA 2.92 ns
5 A NA >120 MHz 120 MHz NABandwidth
30 A NA >120 MHz 120 MHz NA
Current
Expected
output
Certificate Number:
RH %:
Technician:
Minimum Incoming
-3% +3%
-3% +3%
Outgoing
Maximum
TCP0030A Current Probe Instruction Manual 63
Adjustments
Adjustments
The procedures that follow describe adjustments to the probe to bring the performance within the warranted specifications.
DC gain accuracy
Rise time/aberrations
Equipment Required
Refer to the
tool. The tool is available from Tektronix; order part number 003-1433-00.
Performance Verification
procedure for the equipment required. You also need an insulated, flat-bladed adjustment
Equipment Setup
Refer to the
CAUTION.
handling the probe
64 TCP0030A Current Probe Instruction Manual
Performance Verification
To avoid ESD damage to the probe, use an antistatic wrist strap and work at a static-approved workstation when
procedure for the equipment setup.
DC Gain Accuracy
This procedure describes the DC gain accuracy adjustments for the probe. You must first adjust the 5 A range, and then adjust 30 A
range, in that order.
Adjustthe5ARange
Adjustments
Complete the
1.
Performance Verification
DC Gain Accuracy
the test limits, proceed to the next step.
Set the calibrator output to 0.5 A.
2.
Adjust the 5 A DC gain control in the probe head to
3.
display 2.50 V, ±0.075 V on the DMM.
TCP0030A Current Probe Instruction Manual 65
DC Gain Accuracy
procedure. (See page 57,
.) If the measurements fall outside
test in the
Adjustments
Adjust the 30 A Range
Set the probe range to 30 A.
4.
Set the calibrator output to 3.0 A.
5.
Adjust the 30 A DC gain control in the probe
6.
compensation box to display 1.50 V, ±0.045 V on the
DMM.
Disconnect the probe from the current source.
7.
66 TCP0030A Current Probe Instruction Manual
High Frequency Response
Use this procedure to bring the rise time of the probe to within the warranted specifications. This adjustment also affects the
aberrations on the probe output waveform, so for each current range, you may need to optimize the final adjustment between the
two characteristics.
Adjustments
Complete the
1.
test in the
procedure. If the measurements fall
outside the test limits, proceed to the next
step.
Set the Range to 5 A.
2.
Adjust the H.F. control to optimize the rise
3.
time and aberrations.
Set the Range to 30 A and repeat step 3.
4.
Check that the probe response is optimized
5.
for both ranges.
TCP0030A Current Probe Instruction Manual 67
Rise Time and Bandwidth
Performance Verification
Maintenance
Maintenance
This section contains maintenance information for your probe.
Troubleshooting
The TCP0030A current probe is designed to work with all TekVPI-interface oscilloscopes and adapters. The LEDs on the probe
alert you to error or status conditions affecting the probe. If the probe LEDs do not light as expected, or if some of the probe
features do not work properly, an error condition may exist. See the following table.
Table 7: Probe troubleshooting
Symptom
LEDs on the probe flash or remain on:
Jaw Open Continuous red: The conductor jaw is unlocked. Move the slider forward to lock
Overload
Degauss/AutoZero
68 TCP0030A Current Probe Instruction Manual
Possible cause
the jaw closed.
Flashing: An intermittent, repetitive overload is present on the probe. Remove the
probe from the current source. (See page 29,
Continuous red: The measured current exceeds the limit of the probe. Remove the
probe from the current source. (See page 29,
Flashing red: The probe requires degaussing. Degauss the probe.
Flashing red/green: The probe is performing the degauss routine.
Continuous green: The probe is degaussed and ready for use.
Extending Current Range
Extending Current Range
.)
.)
Table 7: Probe troubleshooting (cont.)
Maintenance
Symptom
LEDs on the probe do not light The oscilloscope channel may be bad: Try another channel or another oscilloscope.
An error message displays on the
oscilloscope
Possible cause
All LEDs should light briefly and then the Degauss/AutoZero LED should flash.
If the probe functions correctly on another channel or oscilloscope, the contacts on
the input channel that exhibits the problem may need to be cleaned. Refer to your
oscilloscope manual for the proper cleaning procedure.
If the probe does not work on another channel or oscilloscope, the probe is
defective, and must be returned to Tektronix for repair.
The message will describe the cause and solution. For example, if the
degauss needed
message appears, perform the degauss procedure.
Probe
TCP0030A Current Probe Instruction Manual 69
Maintenance
Cleaning
Protect the probe from adverse weather conditions. The probe is not waterproof.
CAUTION.
the probe during exterior cleaning.
Do not use chemical cleaning agents; they may damage the probe. Avoid using chemicals that contain benzine, benzene,
toluene, xylene, acetone, or similar solvents.
Clean the exterior surfaces of the probe with a dry, lint-free cloth or a soft-bristle brush. If dirt remains, use a soft cloth or swab
dampened with a 75% isopropyl alcohol solution and rinse with deionized water. A swab is useful for cleaning narrow spaces on the
probe, use only enough solution to dampen the swab or cloth. Do not use abrasive compounds on any part of the probe.
70 TCP0030A Current Probe Instruction Manual
To prevent damage to the probe, do not expose it to sprays, liquids, or solvents. Avoid getting moisture inside
Index
Index
A
AC coupling, 34
Accessories
optional, 41
standard, 39
Adjustments, 64
Amp-second product, 36
B
Bucking current, 29
Button
menu, 13
C
Cleaning, 70
Common mode noise, 33
Connect the probe, 2
Coupling modes, 34
Current limitations
amp-second product, 36
maximum continuous, 35
maximum pulsed, 35
Current loop, 55
D
Damage
ESD, 2
DC
coupling, 34
gain accuracy adjustment, 65
gain accuracy check, 57
Degaussing, 3
while connected to a
conductor, 26
Deskew
menu, 16
Differential current, 27
Documentation, xiv
E
Equipment required
performance verification, 54
Equipment setup, 56
ESD damage, 2
Extending the current range of the
probes, 29
F
Features, 1
Fine Scale
menu, 14
Frequency derating, 35
G
Grounding the probe, 19
I
Increasing bucking current, 29
Increasing probe sensitivity, 32
Indicators, 8
J
Jaw, 5
Jaw damage, 17
L
LEDs, flashing, 68
TCP0030A Current Probe Instruction Manual 71
Index
M
Magnetic field errors, 33
Maintenance, 68
Maximum
allowable pulse amplitude, 38
allowable pulse width, 37
continuous current rating, 35
pulsed current rating, 35
Measuring current
current nulls, 27
differential current, 27
Menu button, 13
Menu-driven probe functions, 14
N
Null current, 27
O
Offset
menu, 14
Options, 44
P
Performance verification, 53
Position
menu, 14
Probe
controls and indicators, 8
coupling, 34
extending the current range, 29
increasing the current limit, 29
maximum current limits, 35
saturation, 35
setup menu, 15
R
Record, test, 63
Related documentation, xiv
Rise time check, 61
S
Safety Summary, v
Service options, 44
Slider and conductor jaw, 5
Specifications, 45
nominal, 52
typical, 46
warranted, 45
T
TekVPI, 2
Test record, 63
Troubleshooting, 68
72 TCP0030A Current Probe Instruction Manual
Loading...