Cal Test CT4197 User Manual

4 kV

CAT III

INPUT

4 kV

±

Common Mode

4 kV

CAT III

±4 kV±400 V @ 100x

±40 V @ 10x

DC+AC peak

1000x 100x

10xOFF

200 mA MAX

EXT.SUPPLY

±

OUTPUT

≤

INTO

9V

8V

1 MΩ

MHz High Voltage Dierential Probe

Dierential Mode

±4 kV @ 1000x

ON

CT4197
CT4198

User Manual

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.

1 caltestelectronics.com 450889-001 Rev. A

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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Cal Test Electronics

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:

z In the presence of noxious, corrosive, flammable fumes, gases,

vapors, chemicals, or finely-divided particulates.

z In environments where there is a danger of any liquid being

spilled on the probe.

z In air temperatures exceeding the specified operating

temperatures.

z In 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:

z 2014/30/EU: Electromagnetic Directive (EMC)
z 2014/35/EU: Low-Voltage Directive (safety)
z 2011/65/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:

z IEC/EN 61326-1
z IEC/EN 55011

Safety

This product meets the follow standard(s) of safety for electrical equipment
for measurement, control and laboratory use:

z IEC/EN 61010-1

450889-001 Rev. A caltestelectronics.com 4

Cal Test Electronics

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:

5 caltestelectronics.com 450889-001 Rev. A

Direct current

Both direct and alternating current

Caution, possibility of electric shock

Caution, see documentation for details

Double insulation

Earth Ground

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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Cal Test Electronics

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

z Meets IEC 61010-1 safety standard
z Selectable attenuation settings of 10x, 100x, and 1000x (CT4197)

and 20x, 200x, and 2000x (CT4198)

z 100 MHz bandwidth
z Up to ±4 kV (DC + AC peak) common mode (CT4197)

and ±8 kV (DC + AC peak) common mode (CT4198)

z High accuracy (±2%)
z Power indicator LED
z Over 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:

z Differential 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

z Insulated BNC cable, 100 cm
z 9 V power adapter
z User manual

7 caltestelectronics.com 450889-001 Rev. A

Product Overview

Probe Description

Test Leads,

black and red

4 kV

CAT III

INPUT

4 kV

±

Common Mode

Dierential Mode

±4 kV @ 1000x

±40 V @ 10x

ON

Power and Over

Range Indicators

(Red)

4 kV

CAT III

±4 kV±400 V @ 100x

DC+AC peak

Cal Test Electronics

High Voltage Hook

Probes,

black and red

Alligator Clips,

black and red

10xOFF

1000x 100x

External Power

Connection

MHz High Voltage Dierential Probe

±

OUTPUT

≤

INTO

200 mA MAX

EXT.SUPPLY

9V

8V

1 MΩ

Attenuation

Selector Switch

Insulated BNC

Cable

Figure 1 Front Panel Features

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Cal Test Electronics

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.

9 caltestelectronics.com 450889-001 Rev. A

Cal Test Electronics

Vertical Scale on Oscilloscope

Scope Input

Impedance

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

Probe

Attenuation

Setting

Actual

Attenuation

Setting

Vertical Scale

Reading on the

Oscilloscope

Actual Vertical

Scale of the

Oscilloscope

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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Cal Test Electronics

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

Bandwidth

Rise Time

Attenuation

Accuracy ±2%*

AC CMRR

Maximum Differential Input

Absolute Maximum Rated

Input Voltage (each side to

Input Impedance (each side

Voltages

(DC + AC peak)

ground)

Input Impedance

(Differential)

to ground)

Output Voltage Swing

Offset (typical)

Noise (typical)

Source Impedance

Power Supply

* Accuracy based on DMM with 10 MΩ input impedance.

CT4197 CT4198

10x, 100x, 1000x 20x, 200x, 2000x

±40 V @ 10x ±80 V @ 20x

±400 V @ 100x ±800 V @ 200x

±4000 V @ 1000x ±8000 V @ 2000x

4000 Vrms 8000 Vrms

20 MΩ // 2 pF 30 MΩ // 1.5 pF

10 MΩ // 4 pF 15 MΩ // 3 pF

±8 Vpp (driving 1 MΩ oscilloscope input)

100 MHz

3.5 ns

80 dB @ 60 Hz

60 dB @ 100 Hz

50 dB @ 1 MHz

±5 mV

2 mVrms

50 Ω

9 V power adapter (included)

11 caltestelectronics.com 450889-001 Rev. A

Cal Test Electronics

Mechanical Characteristics

Weight 390 g

Dimensions 218 x 83 x 30 mm

BNC Cable Length 100 cm

Input Leads Length 55 cm each

Environmental Characteristics

Operating Temp/Humidity

Storage Temp/Humidity

Pollution Degree Pollution Degree 2

0°C to 50°C / 10% to 85% RH

-30°C to 70°C / 10% to 90% RH

Safety Specications

IEC 61010-1 CAT II

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.

450889-001 Rev. A caltestelectronics.com 12

Cal Test Electronics

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

Volgage (DC+ACpeak)

Voltage Derating Curve

The derating curve of the absolute maximum input voltage in common
mode is shown as follows:

Figure 2 CT4197: Derating Curve

CT4198 Maximum Input Voltage Derating Curve

10 kV

8,000

3,000

2,000

1 kV

100 V

1KHz 1MHz 10MHz10KHz 100KHz 100MHz

Figure 3 CT4198: Derating Curve

13 caltestelectronics.com 450889-001 Rev. A

Frequency

1000

500

100

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

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