Cal Test Electronics CT4447 Series User manual

User Manual
CT4447 Series
30 MHz High-Voltage Differential
Probes, cTUVus Listed

2CT4447 Series High-Voltage Differential Probes User Manual
Notices
Copywrite © 2022 Cal Test Electronics, Inc. All rights reserved.
Unauthorized duplication of this documentation material is strictly prohibited. Users are permitted to
duplicate and distribute this documentation for internal educational purposes only. Cal Test Electronics
is governed by United States and international copywrite laws.
Made in Taiwan
User Manual Part Number
451-043-001 Rev. C
Available in electronic format only
Published by:
Cal Test Electronics, Inc.
22820 Savi Ranch Parkway
Yorba Linda, CA 92887 USA
Warranty
LIMITED TWO-YEAR WARRANTY
Cal Test Electronics, Inc warrants these products to be free from defective material or workmanship for
a period of 2 years from the date of original purchase. Under this warranty, Cal Test Electronics, Inc
is limited to repairing this product when returned to the factory, shipping charges prepaid, within the
warranty period.
Units returned to Cal Test Electronics, Inc 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, Inc, or that have been repaired by unauthorized persons, will not be covered by this
warranty.
Cal Test Electronics, Inc 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, INC IS
AUTHORIZED TO ASSUME ANY OTHER OBLIGATION IN CONNECTION WITH THE SALE AND
PURCHASE OF THIS DEVICE.

3CT4447 Series High-Voltage Differential Probes User Manual
Contents
Notices......................................................2
User Manual Part Number .......................................2
Warranty.....................................................2
Contents ....................................................3
Compliance Information .........................................5
EMC ........................................................5
EC Declaration of Conformity - EMC..............................5
Safety .......................................................5
EC Declaration of Conformity - Low Voltage........................5
U.S. and Canadian Recognized Agency Certication.................5
Environmental ................................................5
Restriction of Hazardous Substances (RoHS 2) .....................5
Product End-of-Life Handling ...................................6
Terms & Symbols..............................................7
Terms .......................................................7
Symbols .....................................................7
Safety Information .............................................8
Safety Notices ................................................8
IEC Measurement Category & Pollution Degree Denitions .............11
Introduction ..................................................12
Overview ....................................................12
Supplied Accessories...........................................14
Setting Up and Using the Probe...................................15
Setting Up....................................................15
Using .......................................................15
Specications & Characteristics...................................17
Performance Plots .............................................19
Performance Verication ........................................22
Required Equipment............................................22
Test Procedures...............................................23
Test Setup..................................................23
Gain Accuracy...............................................24
Rise Time ..................................................25

4CT4447 Series High-Voltage Differential Probes User Manual
Cleaning.....................................................26
China RoHS 2 ................................................27
Hazardous Substances Disclosure Table ...........................27

5CT4447 Series High-Voltage Differential Probes User Manual
Compliance Information
EMC
EC Declaration of Conformity - EMC
Compliance was demonstrated to the following specications listed in the Ofcial Journal of the
European Communities: EMC Directive 2014/30/EU.
EN 61326-1:2013. Electrical equipment for measurement, control and laboratory use-
EMC requirements Part 1: General requirements.
Safety
EC Declaration of Conformity - Low Voltage
Compliance was demonstrated to the following specication as listed in the Ofcial Journal of the
European Communities: Low Voltage Directive: 2014/35/EU.
EN 61010-1:2010/AMD:2016. Safety requirements for electrical equipment for
measurement, control and laboratory use - Part 031: General requirements
EN 61010-031:2015 Ed 2.0. Safety requirements for electrical equipment for
measurement, control and laboratory use - Part 031: Safety requirements for hand-
held probe assemblies for electrical measurement and test.
U.S. and Canadian Recognized Agency Certication
The probe is has been certied by TUV Rheinland Taiwan Ltd. (TUV) to conform to the following safety
standard and bears the cTUVus mark.
IEC 61010-031:2015 Ed. 2.0. Safety requirements for electrical equipment for
measurement, control and laboratory use - Part 031: Safety requirements for hand-
held probe assemblies for electrical measurement and test.
Environmental
Restriction of Hazardous Substances (RoHS 2)
The product and its accessories conform to the Directive 2011/65/EU (RoHS 2) on the restriction of the
use of certain hazardous substances in electrical and electronic equipment, inclusive of any modication
and addendum to said Directive.
EN ISO 63000:2018 Technical documentation for the assessment of electrical and
electronic products with respect to the restriction of hazardous substances.
China RoHS 2 refers to the Ministry of Industry and Information Technology Order No.
32, effective July 1, 2015. See “Hazardous Substances Disclosure Table” on page
27.

6CT4447 Series High-Voltage Differential Probes User Manual
Product End-of-Life Handling
The equipment may 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 to an
appropriate system that will ensure that most of the materials are reused or recycled appropriately.
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.

7CT4447 Series High-Voltage Differential Probes User Manual
Terms & Symbols
The following terms, symbols, and de nitions, individually or combination may appear on the product or
in this user manual.
Terms
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.
Une mise en garde attire l’attention sur une procédure, une pratique ou une condition
d’utilisation qui, si elles ne sont pas suivies correctement, pourraient endommager ou
détruire une partie du produit ou le produit entier.
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.
Un avertissement attire l’attention sur une procédure, pratique ou condition de
fonctionnement qui, si elles ne sont pas suivies correctement, pourraient entraîner des
blessures, voire la mort de l’utilisateur.
A note statement calls attention to an operating procedure, practice, or condition,
which, should be noted before proceeding.
Un énoncé de note attire l’attention sur une procédure, une pratique ou une condition
d’exploitation, qui doit être notée avant de continuer.
Symbols
CAUTION – Statements or instructions that must be consulted in order to  nd
out the nature of the potential hazard and any actions which must be taken.
WARNING - HIGH VOLTAGE - possibility of electric shock.
Earth (ground) TERMINAL - Refer to the instructions accompanying this sym-
bol in this manual.
The Conformitè Europëenne (CE) mark is the European Union’s (EU) man-
datory conformity marking for regulating the goods sold within the European
Economic Area (EEA).
The cTUVus mark certi es that a product complies with North American electri-
cal and safety standards, including those written by Underwriters Laboratories
and the CSA Group (CSA).
CAUTION
MISE EN GARDE
WARNING
AVERTISSEMENT
NOTE
REMARQUE
Earth (ground) TERMINAL - Refer to the instructions accompanying this sym-

8 CT4447 Series High-Voltage Differential Probes User Manual
Safety Information
Safety Notices
These test probes have been designed and tested in accordance with accepted industry and has
been supplied is a safe condition. Before applying power, verify that the correct safety precautions are
taken (see the following warnings). In addition, note the external markings on the instrument that are
described under “Symbols” on page 7.
Throughout this manual and speci cally in this section, there are warnings, cautions, and notes that you
must follow to ensure safe operation and to maintain the probe in a safe condition.
To avoid personal injury and to prevent  re or damage to the probe and the products
connected to it, review and comply with the following safety Warning and Cautions.
Pour éviter les blessures corporelles et éviter un incendie ou des dommages à la
sonde et aux produits qui y sont connectés, lisez et respectez les avertissements et
mises en garde de sécurité suivants.
Do not use your probe in a manner not speci ed by the manufacturer. Be aware, that
if used in a manner not speci ed by the manufacturer, the protection provided by the
probe assembly may be impaired.
N’utilisez pas votre sonde d’une manière non spéci ée par le fabricant. Sachez que
s’il est utilisé d’une manière non spéci ée par le fabricant, la protection fournie par
l’ensemble de sonde peut être altérée.
The Probe Must be Grounded.
Before making connections to the input leads of the probe, ensure that the output
BNC connector is attached to the BNC input channel of the oscilloscope AND the
oscilloscope is properly grounded.
La sonde doit être mise à la terre.
Avant d’effectuer les connexions aux  ls d’entrée de la sonde, assurez-vous que le
connecteur BNC de sortie est connecté au canal d’entrée BNC de l’oscilloscope ET
que l’oscilloscope est correctement mis à la terre.
Connect and Disconnect the Probe Properly.
Connect the probe to the oscilloscope before connecting the probe inputs to the circuit
under test. Disconnect the probe inputs from the circuit under test before disconnecting
the probe from the oscilloscope.
Connectez et déconnectez correctement la sonde.
Connectez la sonde à l’oscilloscope avant de connecter les entrées de la sonde
au circuit à tester. Déconnectez les entrées de la sonde du circuit à tester avant de
déconnecter la sonde de l’oscilloscope.
Observe Maximum Working Voltages.
To avoid injury, do not use the probes above 1000 Vrms in a CAT III environment
between each input lead and earth or between the two input leads.
Do not operate the CT4447-2 probe above 1000 Vrms mains isolated (200x
WARNING
AVERTISSEMENT
WARNING
AVERTISSEMENT
WARNING
AVERTISSEMENT
WARNING
AVERTISSEMENT
WARNING

9CT4447 Series High-Voltage Differential Probes User Manual
attenuation) between the two input leads and above 1000 Vrms mains isolated (both
20x and 200x attenuation) between each input lead and earth.
Respecter les tensions de fonctionnement maximales.
Pour éviter les blessures, n’utilisez pas les sondes au-dessus de 1000 Vrms dans
un environnement CAT III entre chaque l d’entrée et la terre ou entre les deux ls
d’entrée.
Ne pas faire fonctionner la sonde CT4447-2 au-dessus de 1000 Vrms isolé du secteur
(200x atténuation) entre les deux câbles d’entrée et au-dessus de 1000 Vrms isolé du
secteur (à la fois 20x et 200x atténuation) entre chaque câble d’entrée et la terre.
Do not attempt internal service or adjustment.
Do not install substitute parts or perform unauthorized modications to the probe.
Service should be carried out by Cal Test authorized service personnel. For any
service needs, contact Cal Test Electronics.
Ne tentez pas d’entretien ou de réglage interne.
N’installez pas de pièces de rechange et n’effectuez pas de modications non
autorisées sur la sonde. Le service doit être effectué par le personnel de service
autorisé par Cal Test. Pour tout besoin de service, contactez Cal Test Electronics.
Do Not Operate Without Covers. To avoid electrical shock, or re hazard, do not
operate these probes with cover removed.
Ne pas utiliser sans couvercles. Pour éviter les chocs électriques ou les risques
d’incendie, n’utilisez pas ces sondes avec le couvercle retiré.
Avoid Exposed Circuit. To avoid injury, remove jewelry such as rings, watches, and
other metallic objects. Do not touch exposed connections and components when
power is present.
Évitez les circuits exposés. Pour éviter les blessures, retirez les bijoux tels que
bagues, montres et autres objets métalliques. Ne touchez pas les connexions et les
composants exposés lorsque l’alimentation est présente.
Use Proper Power Source. To ensure these probes function well, use either four fresh
AA batteries or the supplied USB power cord.
Utilisez une source d’alimentation appropriée. Pour garantir le bon fonctionnement
de ces sondes, utilisez soit quatre piles AA neuves, soit le cordon d’alimentation USB
fourni.
For Indoor Use Only. To avoid electric shock, injury, or re hazard, do not operate this
probe in wet or damp conditions or in an explosive atmosphere.
Pour une utilisation en intérieur uniquement. Pour éviter les chocs électriques, les
blessures ou les risques d’incendie, n’utilisez pas cette sonde dans des conditions
humides ou humides ou dans une atmosphère explosive.
AVERTISSEMENT
WARNING
AVERTISSEMENT
WARNING
AVERTISSEMENT
WARNING
AVERTISSEMENT
WARNING
AVERTISSEMENT
WARNING
AVERTISSEMENT

10 CT4447 Series High-Voltage Differential Probes User Manual
Periodically inspect your probe and probe wires to check for any damage. Do Not
Operate with Visible or Suspected Failures. If you suspect there is damage, have it
inspected by Cal Test authorized service personnel.
Inspectez périodiquement votre sonde et ses ls pour vérier qu’ils ne sont pas
endommagés. Ne pas utiliser avec des défaillances visibles ou suspectées. Si vous
pensez qu’il y a des dommages, faites-le inspecter par le personnel de service autorisé
de Cal Test.
When it is likely that the ground protection is impaired, you must make the instrument
inoperative and secure it against any unintended operation.
Lorsqu’il est probable que la protection au sol soit altérée, vous devez rendre
l’instrument inopérant et le sécuriser contre tout fonctionnement intempestif.
The probe and its cables are sensitive parts and therefore, you should be careful not
to damage them though excessive bending or pulling. Avoid any mechanical shocks to
the probe to guarantee accurate performance and protection.
La sonde et ses câbles sont des pièces sensibles et, par conséquent, vous devez faire
attention à ne pas les endommager en les pliant ou en tirant excessivement. Évitez
tout choc mécanique sur la sonde pour garantir des performances et une protection
précises.
WARNING
AVERTISSEMENT
WARNING
AVERTISSEMENT
CAUTION
MISE EN GARDE

11CT4447 Series High-Voltage Differential Probes User Manual
IEC Measurement Category & Pollution Degree Denitions
Measurement Category (CAT) - classication of testing and measuring circuits according to the types of
mains circuits to which they are intended to be connected.
Measurement Category other than II, III, or IV: circuits that are not directly connected
to the mains supply.
Measurement Category II (CAT II): test and measuring circuits connected directly
to ultilzation points (socket outlets and similar prints) of the low-voltage mains
installation..
Measurement Category III (CAT III): test and measuring circuits connected to the
distribution part of a building’s low-voltage mains installation.
Measurement Category IV (CAT IV): test and measuring circuits connected at the
source of the building’s low-voltage mains installation.
Mains Isolated: is for measurements performed on circuits not directly connected to a
mains supply.
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 (P2) - only non-conductive pollution occurs except that occasionally
a temporary conductivity caused by condensation is expected.

12 CT4447 Series High-Voltage Differential Probes User Manual
Introduction
Overview
The Cal Test CT4447 Series High-Voltage Differential probes allow conventional earth-grounded
oscilloscopes to be used for oating signal measurements - up to 700 V differential or common mode
voltage (CT4447-1) and up to 1400 V differential or common mode voltage (CT4447-2).
Each model offers user selectable attenuation setting of 10x & 100x (CT4447-1) and 20x & 200x
(CT4447-2), making both probes highly versatile and usable for a broad range of applications including
power supply measurements and moter controls.
Both probes are compatible with any oscilloscope with a 1 MΩ BNC female input and feature up to 30
MHz of bandwidth. The probes can be powered by any oscilloscope USB port, internal batteries (4 AA
batteries included with the probe), or included mains power adapter.
The gure below show some key features of the CT4447 series probe.
Attenuation Selection
Button & LED Indicators
Protective
Rubber Boot
(Removable)
Figure 1 Probe and Supplied Accessories
Power Button
Insulated BNC Male
Output Connector
Power and Over
Range Indicator
LED
4mm Sheathed
Banana Plug
Connectors
USB-C Input
Power Port
(on side of probe)
Input leads
Output Cable

13CT4447 Series High-Voltage Differential Probes User Manual
Table 1 Key Features
Features Description
Attenuation Selection
Button & LED Indicators
Press the Attenuation selection button to switch between the two
ranges. LED indicator will light green for attenuation selected.
Power Button Press to turn unit on.
Press and hold for 5 seconds to turn unit off.
Power and Overload
indicator LED
LED will turn green when the unit is on.
LED will turn red when the unit is in voltage overload condiction.
(Dimming of LED may indicate low batteries.)
4 mm Sheathed Banana
Plug Connectors
Connects the probe to the DUT using probe hook pair provided wih the
probe.
Insulated BNC Male Output
Connector
The probe’s output connect is full insulated and connects directly to an
oscilloscope’s BNC female input channel connector.
USB-C Input Power Port
(on side of probe)
Use USB-C Power Port to connect with USB cable when powering from
mains adapter or oscilloscope’s USB port.

14 CT4447 Series High-Voltage Differential Probes User Manual
Supplied Accessories
Table 2 CT4447 Accessories
Accessory Model No. Quantity
Probe Hook, Pair
(black & red) CT4386 1
Protective Rubber Boot, Black CT4470-0 1
USB Power Cord (1 m)
(USB-A to USB-C) CT4473-100 1
Power Adapter, N.A. Plugs -
USB Jack
Input: 100-240 Vac, 50/60 Hz
Output: 5 Vdc, 1 A
UL Listed
CT4471 1
EU Plug Converter
(NA to EU Plugs) CT4472 1
Batteries, AA – 4

15CT4447 Series High-Voltage Differential Probes User Manual
Setting Up and Using the Probe
Before connecting the probe for your measurement, read all the warnings in this
section and all of the warnings in the section “Safety Information” on page 8.
Avant de connecter la sonde pour votre mesure, lisez tous les avertissements de cette
section et tous les avertissements de la section « Informations de sécurité » à la page
8.
Setting Up
1. To use this probe,  rst insert the four AA batteries into the probe...
2. OR, connect the USB power cord to the probe (see Figure 1 for the location of the input jack on the
probe) and a USB port on the oscilloscope or to the Power Adapter plugged into a mains circuit.
Using
3. Connect the Insulated BNC male output connector to an input channel of the oscilloscope.
The Probe Must be Grounded.
Before making connections to the input leads of the probe, ensure that the output
BNC connector is attached to the BNC input channel of the oscilloscope AND the
oscilloscope is properly grounded.
La sonde doit être mise à la terre.
Avant d’effectuer les connexions aux  ls d’entrée de la sonde, assurez-vous que le
connecteur BNC de sortie est connecté au canal d’entrée BNC de l’oscilloscope ET
que l’oscilloscope est correctement mis à la terre.
4. Select the desired attenuation ratio, 10x or 100x (CT4447-1); 20x or 200x (CT4447-2), via the
attenuation selection button.
5. Turn off the high voltage source.
6. Press the probe hooks on its matching color 4 mm sheathed banana plug input lead.
7. Connect the probe hooks to the circuit under test.
To protect against electric shock, use only the probe hooks supplied with this probe.
Pour vous protéger contre les chocs électriques, utilisez uniquement les crochets de
sonde fournis avec cette sonde.
WARNING
AVERTISSEMENT
WARNING
AVERTISSEMENT
WARNING
AVERTISSEMENT
Remove protective
rubber boot to access
battery cover
Remove battery
cover screw
Slide battery cover
off to access
compartment

16 CT4447 Series High-Voltage Differential Probes User Manual
8. After conrming that the probe operator is not touching the device under test, turn on the high-volt-
age source.
9. Measure the voltage under test and observe the waveform on the oscilloscope.
Remember the actual voltage is the attenuation factor greater than the oscilloscope
waveform.
N’oubliez pas que la tension réelle est le facteur d’atténuation supérieur à la forme
d’onde de l’oscilloscope.
10. Turn off high voltage source.
11. Disconnect the probe inputs from the high-voltage source.
WARNING
AVERTISSEMENT

17CT4447 Series High-Voltage Differential Probes User Manual
Specications & Characteristics
The probe and oscilloscope should be warmed up for at least 20 minutes before any testing and the
environmental conditions should not exceed the probe’s specied limits.
All entries included in the following tables are characteristics unless otherwise stated.
Toutes les entrées incluses dans les tableaux suivants sont des caractéristiques, sauf
indication contraire.
Table 3 Safety Specications
Parameter Condition
IEC/EN 61010-031:2015 Measurement Category III
Table 4 Electrical Specications (Not Warranted)
Parameter CT4447-1 CT4447-2
Bandwidth (-3 dB) 30 MHz 30 MHz
Gain Accuracy ±2% ±2%
Attenuation Ratio 10x / 100x 20x / 200x
Rise Time 14 ns 14 ns
Absolute Maximum Rated Input
Voltage (each side to ground) 1000 V CAT III 1000 V CAT III
Maximum Differential Input
Voltage (DC + Peak AC)
±70 V at 10x
±700 V at 100x
±140 V at 20x
±1400 V at 200x
Maximum Common Mode Input
Voltage (DC + Peak AC)
±70 V at 10x
±700 V at 100x
±140 V at 20x
±1400 V at 200x
Input Impedance 5 MΩ, 2 pF (each side to
ground)
5 MΩ, 2 pF (each side to
ground)
Output Voltage ±7 V (driving 1 MΩ load) ±7 V (driving 1 MΩ load)
Offset (typical) ±20 mV ±20 mV
Noise (typical) 0.7 mVrms 0.7 mVrms
CMRR (typical)
50 Hz: -72 dB
20 kHz: -66 dB
200 kHz: -56 dB
50 Hz: -72 dB
20 kHz: -66 dB
200 kHz: -56 dB
Power Requirements 4 x AA batteries or
USB-C cable
4 x AA batteries or
USB-C cable
Mains Adapter (N.A. Plugs) Input:100-240 V AC, 0.35 A
Output: 5 V DC, 1 A
Input:100-240 V AC, 0.35 A
Output: 5 V DC, 1 A
NOTE
REMARQUE

18 CT4447 Series High-Voltage Differential Probes User Manual
Table 5 Mechanical Specications (same for both versions)
Parameter Characteristic
Input Leads Length (each) 55 cm ±3 cm
BNC Cable Length 95 cm ±3 cm
Dimension (L x W x H) 220 mm, 68 mm, 28 mm (with protective rubber boot)
Weight 488 g (1.08 lb) (with batteries and protective rubber boot)
USB Type C Cable Length 100 cm ±3 cm
Table 6 Environmental Specications (same for both versions)
Parameter Characteristic
Operating Temperature -10°C to 40°C (14°F to 104°F)
Storage Temperature -30°C to 70°C (-22°F to 158°F)
Humidity ≤ 80% RH @ 25°C to 35°C (77°F to 95°F)
Altitude Operating: 2000 m
Non-operating: 15000 m
Pollution Degree P2

19CT4447 Series High-Voltage Differential Probes User Manual
Performance Plots
Figure 3 Rise Time
10x attenuation, 10%-90%
Figure 4 Rise Time
100x attenuation, 10%-90%

20 CT4447 Series High-Voltage Differential Probes User Manual
Figure 5 Rise Time
20x attenuation, 10%-90%
Figure 6 Rise Time
200x attenuation, 10%-90%
TEK_SCOPE 10 Jan 2022 13:17:33
TEK_SCOPE 10 Jan 2022 13:20:17