Cal Test Electronics CT4197 User manual

CT4197
CT4198
User Manual
INPUT
4 kV
4 kV
CAT III
EXT.SUPPLY
OUTPUT
4 kV
CAT III
±
±
9V
200 mA MAX
8V
INTO
1 MΩ
≤
Dierential Mode
DC+AC peak
Common Mode
±4 kV @ 1000x
±4 kV±400 V @ 100x
±40 V @ 10x
1000x 100x
10xOFF
ON
MHz High Voltage Dierential Probe

1caltestelectronics.com 450889-001 Rev. A
Cal Test Electronics
CT4197 and CT4198 Differential Probes User’s Manual
© 2018 Cal Test Electronics. All rights reserved.
Unauthorized duplication of Cal Test Electronics documentation
materials is strictly prohibited. Customers are permitted to duplicate
and distribute Cal Test Electronics documentation for internal
educational purposes.

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Cal Test Electronics
Safety Summary
To avoid personal injury and/or product damage, review and comply with
the following safety precautions. These precautions apply to both operating
and maintenance personnel and must be followed during all phases of
operation, service, and repair of this probe.
A WARNING statement calls attention to an operating procedure,
practice, or condition, which, if not followed correctly, could result
in injury or death to personnel.
A CAUTION statement calls attention to an operating procedure,
practice, or condition, which, if not followed correctly, could result
in damage to or destruction of parts or the entire product.
Do Not Work Alone
Do not work alone when working with high voltages.
Inspect the Probe
Inspect the probe and accessories for cracks and frayed or broken leads
before each use. If defects or damages are noted, DO NOT USE the
probe.
Dry Conditions
Hands, shoes, oor, and work bench must be dry. Avoid making
measurements under humidity, dampness, or other environmental
conditions that might affect safety.
Do Not Remove the Probe’s Casing
Removal of the probe’s casing may expose you to electric shock. If
necessary, disconnect the inputs and outputs of the probe before opening
the case.
Hazardous Contact
To avoid injury, remove jewelry such as rings, watches, and other metallic
objects. Do not touch exposed connections and components when power
is present.
Unexpected Charges
Hazardous voltages may be present in unexpected locations in circuitry
being tested when a fault condition in the circuit exists.

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Capacitors inside the instrument may retain a charge even if the instrument
is disconnected from its source of supply.
Use Only in Ofce-Type Indoor Setting
The probe is designed to be used in ofce-type indoor environments. Do
not operate the probe:
zIn the presence of noxious, corrosive, flammable fumes, gases,
vapors, chemicals, or finely-divided particulates.
zIn environments where there is a danger of any liquid being
spilled on the probe.
zIn air temperatures exceeding the specified operating
temperatures.
zIn atmospheric pressures outside the specified altitude limits or
where the surrounding gas is not air.
Not for Critical Applications
This probe is not authorized for use in contact with the human body or for
use as a component in a life-support device or system.
Do Not Substitute Parts
Do not install substitute parts or perform any unauthorized modication to
the instrument.
Only Qualied Personnel
Only qualied personnel should use this probe. This differential voltage
probe is designed to be used by personnel who are trained, experienced,
or otherwise qualied to recognize hazardous situations and who are
trained in the safety precautions necessary to avoid possible injury when
using such a device.
Observe Maximum Working Voltage
Do not use any probe above its maximum working voltage ranges. See
“Electronic Characteristics” on page 11.
Use Proper Power Source
Do not operate this probe from a power source that applies more than the
voltage specied.

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Cal Test Electronics
Must be Grounded
This probe is grounded by the shell of the BNC connector through the
grounding conductor of the power cord of the measurement instrument.
Before making connections to the input leads of this probe, ensure
that the output BNC connector is attached to the BNC connector of the
measurement instrument, and that the measurement instrument is properly
grounded. Whenever it is likely that the ground protection is impaired,
you must make the instrument inoperative and secure it against any
unintended operation.
CE Compliance
This product meets the essential requirements of the applicable European
Directives as follows:
z2014/30/EU: Electromagnetic Directive (EMC)
z2014/35/EU: Low-Voltage Directive (safety)
z2011/65/EU: Restriction of Hazardous Substances Directive
(RoHS)
Electromagnetic Compatibility
This product meets the follow standard(s) of safety for electrical equipment
for measurement, control and laboratory use:
zIEC/EN 61326-1
zIEC/EN 55011
Safety
This product meets the follow standard(s) of safety for electrical equipment
for measurement, control and laboratory use:
zIEC/EN 61010-1

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Disposal of Old Electrical & Electronic Equipment
(Applicable in the European Union and other European
countries with separate collection systems). This product is
subject to Directive 2012/19/EU of the European Parliament
and the Council of the European Union on waste electrical
and electronic equipment (WEEE), and in jurisdictions
adopting that Directive, is marked as being put on the market
after August 13, 2005, and should not be disposed of as
unsorted municipal waste. Please utilize your local WEEE
collection facilities in the disposition of this product and
otherwise observe all applicable requirements.
This probe is in compliance with IEC-61010-1 CAT II, Pollution Degree 2.
Terms and Symbols
The following symbols may appear on the product or in its documentation:
Direct current
Both direct and alternating current
Caution, possibility of electric shock
Caution, see documentation for details
Double insulation
Earth Ground

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Cal Test Electronics
Denitions
MEASUREMENT CATEGORY - classication of testing and measuring
circuits according to the types of mains circuits to which they are intended
to be connected.
MEASUREMENT CATEGORY II (CAT II) - measuring circuits
connected directly to utilization points of the low-voltage mains
installation
POLLUTION - addition of foreign matter, solid, liquid, or gaseous (ionized
gases) that may produce a reduction of dielectric strength or surface
resistivity.
POLLUTION DEGREE 2 - only non-conductive pollution occurs except
that occasionally a temporary conductivity caused by condensation is
expected.
Working CAT rating is equal to that of the lowest rated element
within the test set-up.

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Introduction
Overview
The CT4197 and CT4198 differential probes allows safe, accurate
measurement between two voltage points where neither point is
referenced to ground. Both probes offer a 100 MHz bandwidth. Both
are compatible with oscilloscopes from all major manufacturers. The
probes are exclusively powered by the included 9 V power adapter.
Features
zMeets IEC 61010-1 safety standard
zSelectable attenuation settings of 10x, 100x, and 1000x (CT4197)
and 20x, 200x, and 2000x (CT4198)
z100 MHz bandwidth
zUp to ±4 kV (DC + AC peak) common mode (CT4197)
and ±8 kV (DC + AC peak) common mode (CT4198)
zHigh accuracy (±2%)
zPower indicator LED
zOver range indicator LED
Initial Inspection
This unit is tested prior to shipment but an initial physical inspection
should be made to ensure that no damage has been sustained during
shipment. After the inspection, verify the contents of the shipment. The
included items for this product are:
zDifferential probe
z(2) High voltage hook probes, black & red
z(2) Alligator clips, black & red
z(2) Retractable sheathed 4 mm banana plug test leads, silicone
jacketed, black and red
zInsulated BNC cable, 100 cm
z9 V power adapter
zUser manual

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Cal Test Electronics
Product Overview
Probe Description
INPUT
4 kV
4 kV
CAT III
EXT.SUPPLY
OUTPUT
4 kV
CAT III
±
±9V
200 mA MAX
8V
INTO 1 MΩ
≤
Dierential Mode
DC+AC peak
Common Mode
±4 kV @ 1000x
±4 kV±400 V @ 100x
±40 V @ 10x
1000x 100x
10xOFF
ON
MHz High Voltage Dierential Probe
Figure 1 Front Panel Features
Test Leads,
black and red
Insulated BNC
Cable
High Voltage Hook
Probes,
black and red
Alligator Clips,
black and red
Power and Over
Range Indicators
(Red)
Attenuation
Selector Switch
External Power
Connection

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Using the Probe
WARNING At the time of powering on the probe, the input
leads must not be connected to an item to be tested. Never
operate the probe with the case open.
CAUTION This probe is used to carry out differential mea-
surements between two points on the circuit under test. This
probe is not designed for electrically insulating the circuit
under test or the measuring instrument.
Getting Started
1. Connect the BNC output connector to the vertical input of a
general purposed oscilloscope. The oscilloscope must have a
ground referenced.
2. Connect power adapter.
3. Select the proper attenuation ratio. See Electrical
Characteristics on page 11.
4. The power indicator LED should turn on.
5. Plug the hook probes or alligator clips onto the test leads and
connect the circuit to be tested.
Vertical Scale on Oscilloscope
The actual vertical scale of the oscilloscope is equal to the attenuation
factor multiplied by the range of vertical scale selected on the
oscilloscope. For example, with the probe on factor 200x and the
oscilloscope on 0.5 V/div, the real vertical scale is 200x 0.5 = 100 V/
div. With the probe on 20x, the real vertical scale is 20 x 0.5 = 10 V/
div. These values apply when the oscilloscope is set to the typical 1
MΩ impedance input. When the scope is set to 50 Ω input, the actual
vertical scale will be doubled: 200 V/div for the 200x setting and 20 V/
div for the 20x setting. See the chart below.

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Cal Test Electronics
Vertical Scale on Oscilloscope
Scope Input
Impedance
Probe
Attenuation
Setting
Actual
Attenuation
Setting
Vertical Scale
Reading on the
Oscilloscope
Actual Vertical
Scale of the
Oscilloscope
1 MΩ 20x 20x 0.5 V/div 10 V/div
1 MΩ 200x 200x 0.5 V/div 100 V/div
1 MΩ 2000x 2000x 0.5 V/div 1000 V/div
50 Ω 20x 40x 0.5 V/div 20 V/div
50 Ω 200x 400x 0.5 V/div 200 V/div
50 Ω 2000x 4000x 0.5 V/div 2000 V/div
Table 1 Oscilloscope Readings
Cleaning
This probe does not require any particular cleaning. If necessary, clean
the case with a soft cloth.
WARNING Dry the probe thoroughly before attempting to
make voltage measurements.
CAUTION Avoid immersing or using abrasive cleaners or
solvents containing Benzene (or similar solvents) on the probe
as these can cause deterioration of the probe body and
cables.

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Specications
All specications apply to the unit after a temperature stabilization time
of 20 minutes over an ambient range of 25°C ± 5°C.
Electrical Characteristics
Probe CT4197 CT4198
Bandwidth 100 MHz
Rise Time 3.5 ns
Attenuation 10x, 100x, 1000x 20x, 200x, 2000x
Accuracy ±2%*
AC CMRR
80 dB @ 60 Hz
60 dB @ 100 Hz
50 dB @ 1 MHz
Maximum Differential Input
Voltages
(DC + AC peak)
±40 V @ 10x ±80 V @ 20x
±400 V @ 100x ±800 V @ 200x
±4000 V @ 1000x ±8000 V @ 2000x
Absolute Maximum Rated
Input Voltage (each side to
ground)
4000 Vrms 8000 Vrms
Input Impedance
(Differential) 20 MΩ // 2 pF 30 MΩ // 1.5 pF
Input Impedance (each side
to ground) 10 MΩ // 4 pF 15 MΩ // 3 pF
Output Voltage Swing ±8 Vpp (driving 1 MΩ oscilloscope input)
Offset (typical) ±5 mV
Noise (typical) 2 mVrms
Source Impedance 50 Ω
Power Supply 9 V power adapter (included)
* Accuracy based on DMM with 10 MΩ input impedance.

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Cal Test Electronics
Environmental Characteristics
Operating Temp/Humidity 0°C to 50°C / 10% to 85% RH
Storage Temp/Humidity -30°C to 70°C / 10% to 90% RH
Pollution Degree Pollution Degree 2
Safety Specications
IEC 61010-1 CAT II
Mechanical Characteristics
Weight 390 g
Dimensions 218 x 83 x 30 mm
BNC Cable Length 100 cm
Input Leads Length 55 cm each
Specications are subject to change without notice. To ensure the most current version of this
manual, please download the current version from our website: caltesetlectronics.com.

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Voltage Derating Curve
The derating curve of the absolute maximum input voltage in common
mode is shown as follows:
Figure 2 CT4197: Derating Curve
1KHz 1MHz 10MHz10KHz 100KHz 100MHz
Frequency
5 kV
500 V
50 V
Volgage (DC+ACpeak)
CT4197 Maximum Input Voltage Derating Curve
4,000
1,500
1,000
500
250
50
1KHz 1MHz 10MHz10KHz 100KHz 100MHz
Frequency
10 kV
1 kV
100 V
Volgage (DC+ACpeak)
CT4198 Maximum Input Voltage Derating Curve
8,000
3,000
2,000
1000
500
100
Figure 3 CT4198: Derating Curve

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Cal Test Electronics
Service & Warranty Information
Limited One-Year Warranty
Cal Test Electronics warrants these products to be free from defective
material or workmanship for a period of 1 year from the date of original
purchase. Under this warranty, Cal Test Electronics is limited to
repairing the defective device when returned to the factory, shipping
charges prepaid, within the warranty period.
Units returned to Cal Test Electronics that have been subject to abuse,
misuse, damage, or accident, or have been connected, installed, or
adjusted contrary to the instructions furnished by Cal Test Electronics,
or that have been repaired by unauthorized persons, will not be
covered by this warranty.
Cal Test Electronics reserves the right to discontinue models, change
specications, price, or design of this device at any time without notice
and without incurring any obligation whatsoever.
The purchaser agrees to assume all liabilities for any damages and/or
bodily injury which may result from the use or misuse of this device by
the purchaser, his employees, or agents.
This warranty is in lieu of all other representations or warranties
expressed or implied and no agent or representative of Cal Test
Electronics is authorized to assume any other obligation in connection
with the sale and purchase of this device.
Service
If you have a need for calibration or repair services, technical, or sales
support, please contact us:
22820 Savi Ranch Parkway
Yorba Linda, CA 92887
800-572-1028 or 714-221-9330
caltestelectronics.com

450889-001 Rev. A