Cal Test CT2700A User Manual

CT2700A
40 kV High-Voltage DMM Probe

User Manual

Notices

Copywrite © 2023 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

451-103-001

Available in electronic format only

Published by:

Cal Test Electronics, Inc.
22820 Savi Ranch Parkway
Yorba Linda, CA 92887 USA

Warranty

LIMITED ONE-YEAR WARRANTY

Cal Test Electronics, Inc 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, 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 specifications, 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.

2 CT2700A 40 kV High-Voltage DMM Probe User Manual

Contents

Notices ........................................................2

User Manual Part Number .........................................2

Warranty .......................................................2

Contents ......................................................3

Compliance Information ...........................................4

Safety .........................................................4

Environmental ...................................................4

Terms & Symbols ................................................5

Terms .........................................................5

Symbols .......................................................5

Safety Information ...............................................6

Usage Precautions ...............................................6

IEC Measurement Category & Pollution Degree Definitons ................7

EC Declaration of Conformity - Low Voltage .........................4

Restriction of Hazardous Substances (RoHS 2) ......................4

Introduction ....................................................8

Overview .......................................................8

Supplied Accessories ............................................8

Using Accessories ...............................................9

Round Tip & Hook Tip ...........................................9

Flat Bar Tip ...................................................9

Measurement Instructions .........................................10

Steps .........................................................10

Specifications ..................................................11

Cleaning .......................................................12

China RoHS 2 ..................................................13

Hazardous Substances Disclosure Table .............................13

3CT2700A 40 kV High-Voltage DMM Probe User Manual

Compliance Information

Safety

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: 2014/35/EU.

EN 61010-031:2015 Ed 2.0. Safety requirements for electrical equipment for measure-

ment, 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 modification
and addendum to said Directive.

EN ISO 63000:2018 Technical documentation for the assessment of electrical and elec-

tronic 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 13.

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.

4 CT2700A 40 kV High-Voltage DMM Probe User Manual

Terms & Symbols

The following terms, symbols, and definitions, 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,

CAUTION

A warning statement calls attention to an operating procedure, practice, or condition,

WARNING

NOTE

Symbols

CAUTION – Statements or instructions that must be consulted in order to find

out the nature of the potential hazard and any actions which must be taken.

which, if not followed correctly, could result in damage to or destruction of parts or the
entire product.

which, if not followed correctly, could result in injury or death to personnel.

A note statement calls attention to an operating procedure, practice, or condition, which,
should be noted before proceeding.

WARNING - HIGH VOLTAGE - possibility of electric shock.

The Conformitè Europëenne (CE) Mark is the European Union’s (EU) mandatory

conformity marking for regulating the goods sold within the European Economic
Area (EEA).

5CT2700A 40 kV High-Voltage DMM Probe User Manual

Safety Information

Usage Precautions

The high-voltage probe is designed to prevent accidental shock to the operator when

WARNING

properly used. This operating note must be read and understood prior to using the
probe. Improper procedure or incorrect analysis of the measurement situation can result
in serious shock.

WARNING

WARNING

WARNING

WARNING

WARNING

WARNING

WARNING

This high-voltage probe must only be used by personnel who are trained, experienced,
or otherwise qualified to recognize hazardous situations and who are trained to the safe­ty precautions that are necessary to avoid possible injury when using such a device.

This high-voltage probe is designed for use with Measurement Category other than II, III
and IV only (formally CAT I). Do not use the probe for measurements performed on cir­cuits defined by any other measurement category or transient overvoltages of more than
1500 V. Refer to IEC Measurement Category Definitions on page 7 for a definition of
measurement categories.

The ground lead is critical to the safe operation of the probe. Failure to make this
connection when making high-voltage measurements may result in personal injury or
damage to the probe or oscilloscope. This connection must always be made BEFORE
the probe tip comes in contact with the high voltage and must not be removed until the
probe tip has been removed from the high-voltage source.

Hands, shoes, floor, and work bench must be dry. Avoid making measurements under
humidity, dampness, or other environmental conditions that might affect safety.

To avoid injury, remove jewelry such as rings, watches, and other metallic objects. Do
not touch exposed connections and components when power is present.

Do not work alone when working with high-Voltage Circuits.

The probe is designed to be used in office-type indoor environments.

• Do not operate in the presence of noxious, corrosive, flammable fumes, gases, vapors,
chemicals, or finely-divided particulates.

• Hands, shoes, floor, and workbench must be dry. Avoid making measurements under
humid, damp, or other environmental conditions that might effect the safety of the
measurement situation.

• The probe body should be kept clean and free of any conductive contamination. Refer
to the section on cleaning.

To reduce the risk of shock or fire:

WARNING

• Connect the probe to the oscilloscope before connecting probe to the circuit under
test. Disconnect the probe input from the circuit before disconnecting the probe from
the oscilloscope.

• Do not exceed the voltage rating category rating of the probe. Use only accessories
provided with probe.

6 CT2700A 40 kV High-Voltage DMM Probe User Manual

• Keep finger behind the finger guard of the probe body.

• For your own safety, inspect the probe for cracks and frayed or broken leads before
each use. If defects are noted, DO NOT use the probe.

• Keep the probe’s output cables away from the circuit under test, as they are not
intended to be in contact with these circuits.

It is advisable to turn the high-voltage source off before connecting or disconnecting the

WARNING

probe.

WARNING

Do not connect the ground clip to the high voltage source or the probe tip to the ground

WARNING

Do not attempt to take measurements where the source and the test instrument chassis
or return lead is not properly grounded.

for any reason.

IEC Measurement Category & Pollution Degree Definitons

Measurment Category (CAT) - classification of testing and measuring circuits according to the types of
mains circuits to which they are intended to be connected.

Measurment Category other than II, III, or IV: circuits that are not directly connected to

the mains supply.

Measurment Category II (CAT II): test and measuring circuits connected directly to ultilz-

ation points (socket outlets and similar prints) of the low-voltage mains installation..

Measurment Category III (CAT III): test and measuring circuits connected to the distribu-

tion part of a building’s low-voltage mains installation.

Measurment Category IV (CAT IV): test and measuring circuits connected at the source

of the building’s 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 (P2)- only non-conductive pollution occurs except that occasionally a

temporary conductivity caused by condensation is expected.

7CT2700A 40 kV High-Voltage DMM Probe User Manual

Introduction

Overview

The Cal Test CT2700A 40 kV High-Voltage Digitial Multimeter (DMM) probe can be used with anlalog or
digital multimeters (DMMs) which accept 4 mm sheathed banana plugs and have an input resistance of
10 MΩ (±1%). The CT2700A is a 1000:1 divider which extends the voltage meansurement capability to 28
kV ACrms.

Features of the probe:

• Up to 40 kV (DC + ACpeak) or 28 kV ACrms

• 300 Hz bandwidth (-3dB)

• ±3% accuracy (20 kV to 40 kV)

• IEC/EN 61010-031

4 mm Sheathed Banana
Plug Input Leads, Black
& Red

Round Tip

Hook Tip

Alligator Clip Ground

M5 Threaded
Stud

Flat Bar Tip

Figure 1 Probe and Supplied Accessories

Lead (Fixed)

Supplied Accessories

Table 1 CT4432 Accessory Replacements

Accessory Model No. Quantity

Round Tip CT2960A 1

Hook Tip CT2961A 1

Flat Bar Tip CT2962A 1

8 CT2700A 40 kV High-Voltage DMM Probe User Manual

Using Accessories

Round Tip & Hook Tip

Thread either the Round Tip or the Hook Tip onto the probe’s M5 tip stud and securely hand-tighten.

Figure 2 Attaching the Round and Hook Tips

Flat Bar Tip

The end of the Flat Bar Tip can be clamped to the device-under-test (DUT). To secure the Flat Bar Tip to
the probe, use the supplied M5 flange nut (8 mm wrench or nut driver) as show in Figure 3.

Figure 3 Attaching the Flat Bar Tip

9CT2700A 40 kV High-Voltage DMM Probe User Manual

Measurement Instructions

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 6.

Steps

1. Whenever possible, turn off the high-voltage source before making any connections.

2. Connect the alligator ground clip lead to a good earth ground or reliable chassis ground.

3. Connect the probe’s 4 mm sheathed banana plugs to the DMM’s input jacks; Red to voltage jack and
Black to COM jack.

4. On the DMM, select the voltage range.

CAUTION

Do not use autoranging.

Before turning on the high voltage source, make sure that no part of the person holding

WARNING

the probe is touching the device under test.

5. After confirming that the probe operator is not touching the device under test, turn on the high-volt­age source.

6. Measure the voltage readout on the DMM.

Remember the actual voltage is 1000 times greater than the DMM reading.

WARNING

7. Turn off the high voltage source.

8. Disconnect the probe tip from the high-voltage source.

9. Disconnect the probe’s ground clip lead.

Disconnect the probe tip from the high voltage source BEFORE disconnecting the alliga-

WARNING

tor ground clip lead.

10 CT2700A 40 kV High-Voltage DMM Probe User Manual

Specifications

All specifications apply to the probe after a temperature stabilization time of 15 minutes over an ambient
temperature range of 25°C ±5°C.

All entries included in the following tables are characteristics unless otherwise stated.s

NOTE

Table 2 Safety Specifications

Parameter Condition

IEC/EN 61010-031:2015 Measurement Category other than II, III, or IV (formally CAT I)

Table 3 Electrical Specifications (Not Warranted)

Parameter Characteristic

Maximum Input Voltage

Maximum Loading Current ≤40 µA (at 40 kV DC)

Division Ratio 1000:1

Bandwidth DC to 300 Hz (-3 dB)

Input Resistance 1000 MΩ

VDC Accuracy

VAC Accuracy 5% at 60 Hz (1 to 28 kV)

Temperature Coefficient ≤200 ppm/°C

Maximum Loading Power ≤1.6 W

Source Impedance 10 MΩ

Table 4 Mechanical Specifications

Parameter Characteristic

Cable & Lead Lengths 1 m (39”)

40 kV (DC + AC peak)
28 kV ACrms

±1% (<20 kV)
±3% (20 kV to 40 kV)
≤0.5% (with 10 MΩ input impedance DMM only)

Operating Temperature 0°C to 50°C (32°F to 122°F)

Storage Temperature -20°C to 70°C (-4°F to 158°F)

Humidity ≤ 80% RH @ 40°C (104°F)

Dimensions 340 mm length x 80 mm diameter

Weight 300 g (0.66 lb)

Pollution Pollution Degree 2 (P2)

11CT2700A 40 kV High-Voltage DMM Probe User Manual

Cleaning

Clean only the exterior probe body and cables. Use a soft cotton cloth light moistened with a mild solu­tion of detergent and water. Do not allow any portion of the probe to be submerged at any time.

Dry the probe thoroughly before attempting to make voltage measurements.

WARNING

Do not subject the probe to solvents or solvent fumes as these can cause deterioration

CAUTION

of the probe body and cables.

12 CT2700A 40 kV High-Voltage DMM Probe User Manual

China RoHS 2

Hazardous Substances Disclosure Table

China RoHS 2 refers to the Ministry of Industry and Information Technology Order No.

中國 RoHS 2 指工業和信息化部令第 32 號，自 2015 年 7 月 1 日起生效，題為《電氣電子產品有害物質限制使用管
理辦法》。為符合中國 RoHS 2，我們根據電子電氣產品有害物質限制使用標誌 SJT 11364 將本產品的環保使用期限
(EPUP) 確定為 25 年。

Part Name

零件名稱

32, effective July 1, 2015, titled Management Methods for the Restriction of the Use
of Hazardous Substances in Electrical and Electronic Products. To comply with China
RoHS 2, we determined this product’s Environmental Protection Use Period (EPUP) to
be 25 years in accordance with the Marking for the Restricted Use of Hazardous Sub­stances in Electronic and Electrical Products, SJT 11364.

Hazardous Substance 有害物質

Lead

(Pb)

鉛

Mercury

(Hg)

汞

Cadmium

(Cd)

鎘

Hexavalent

Chromium

(Cr (VI))

六價鉻

Polybrominated

biphenyls (PBB)

多溴聯苯

Polybrominated
diphenyl ethers

(PBDE)

多溴二苯醚

Printed Circuit Board Assemblies

印刷電路板組件

Electrical Components

電氣元件

Metal Components

金屬部件

Plastic Components

塑料部件

This table is made per guidance of SJ/T 11364.

該表是根據 SJ/T 11364 的指南製作的。

O: Indicates that this hazardous substance contained in all of the homogeneous materials for the part is below the

limit requirement in GB/T 26572.

O: 表示該有害物質在該部件的所有均質材料中的含量低於 GB/T 26572 中的限量要求。

X: Indicates that this hazardous substance contained in at least one of the homogeneous materials used for this part

is above the limit requirement in GB/T 26572.

X: 表示該有害物質在用於該部件的至少一種均質材料中的含量高於 GB/T 26572 中的限量要求。

x o o o o o

x o o o o o

x o o o o o

o o o o o o

13CT2700A 40 kV High-Voltage DMM Probe User Manual

© Cal Test Electronics, Inc.

Electronic Format Only

Manual Part Number: 451-103-001

Revision: A