Cal Test Electronics CT4024 User Manual

CT4024

User Manual

Safety Summary

WARNING CAUTION

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 instrument.

Only qualied personnel should use this probe. This high 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.

This instrument is intended for usage within Measurement Category I (CAT I) only.

Do not exceed 60 seconds of contact with high voltage. When

making contact between this probe and any circuit with voltages ≥8 kV DC, ≥5 kVrms AC, or ≥15 kVpk-pk AC, wait for 5 minutes between such

measurements.

Do not work alone when working with high voltages.

Do not apply to the input any potential that exceeds the maximum rating of the probe.

For your own safety, inspect the probes for cracks and frayed or broken

leads before each use. If defects are noted, DO NOT USE the probe.

Hands, shoes, oor and work bench must be dry.

Avoid making measurements under humidity, dampness or other

environmental conditions that might affect safety.

Turn the high voltage source off before connecting or disconnecting the probe whenever possible.

The probe body should be kept clean and free of any conductive contamination.

Do not remove the probe casing. Removal of the probe’s casing may

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expose you to electric shock.

Keep ngers behind the probe’s nger guard during use.

Always properly ground the probe with the lead before contacting high

voltage circuits with the probe tip. Always disconnect the probe tip from

high voltage circuits before disconnecting the ground lead. Do not connect the probe ground lead to any point which is at a potential other than earth ground.

Use only on test instruments where the chassis or return lead is properly grounded.

Use only in ofce-type indoor setting

z The instrument is designed to be used in office-type indoor

environments. Do not operate the instrument:

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

gases, vapors, chemicals, or finely-divided particulates.

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

spilled on the instrument.

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.

Use in an indoor Pollution Degree 2 environment. Measurements made

by this instrument may be outside specications if the instrument is used in non-ofce-type environments. Such environments may include rapid

temperature or humidity changes, sunlight, vibration and/or mechanical

shocks, acoustic noise, electrical noise, strong electric elds, or strong magnetic elds.

Not for critical applications. This instrument is not authorized for use in contact with the human body or for use as a component in a life-support

device or system.

Hazardous voltages may be present in unexpected locations in circuitry being tested when a fault condition in the circuit exists.

Do not substitute parts that are not approved by Cal Test Electronics or modify this instrument. Return the instrument to Cal Test Electronics

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for service and repair to ensure that safety and performance features are maintained.

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.

CAUTION statement calls attention to an operating procedure, practice,

A

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

Compliance Statements

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.

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1 Introduction

Overview

The Elditest CT4024 is an 8 kV High Voltage divider probe for use with

both digital and analog oscilloscopes.

Features

z Measures up to: 8 kV (DC + ACpk) or 6 kVrms AC z 40 MHz bandwidth z Voltage dividing of 1000:1 z Frequency compensation

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2 Using the Probe

1. Connect the probe to the BNC input of the oscilloscope.

2. Select the desired volts/division range on your oscilloscope.

3. If possible, always turn the high voltage source off before connecting or disconnecting the probe.

4. Connect the divider probe ground lead (alligator clip) to a good earth ground or reliable chassis ground.

5. Before turning on the high voltage source, be certain the operator is not touching any part of the device under test.

6. Turn on the high voltage source.

7. You will now be able to analyze the voltage waveform on your oscilloscope.

8. Turn off the high voltage source.

9. Disconnect the High Voltage Probe from the high voltage source

BEFORE disconnecting the ground clip lead.

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3 Frequency Compensation

Proper compensation of the probe is required to assure amplitude

accuracy of the waveform being measured by matching the probe to the oscilloscope’s input capacitance. Compensation should be adjusted whenever the probe is connected to, or transferred between, oscilloscopes.

The procedure is the same as for a x10 passive probe.

z Connect the probe to the oscilloscope. z Connect probe tip to square-wave generator. z Adjust the square wave generator for 10 V amplitude. z Adjust the oscilloscope for a time base of 500 µs/div. z Turn trimmer (Figure 1) to adjust the compensation on the probe

making a flat pulse top.

Frequency Compensation Trimmer

Figure 1: Trimmer on BNC

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Figure 2 shows how over- and under-compensated pulse responses

will look.

Figure 2: Over/Under Compensation

Figure 3 shows a perfectly compensated probe.

Figure 3: Good Compensation

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4 Specications

All specications apply to the unit after a temperature stabilization time of 15 minutes over an ambient temperature range of 25 °C ± 5 °C.

CT4024

8 kV High Voltage Probe

Operating Parameters

Maximum Input Voltage

(CAT I)

Division Ratio 1000:1

Bandwidth 40 MHz (-3 dB)

Compensation Range 5 pF to 50 pF

Temperature Coefcient ≤200 ppm/ºC

Input Resistance 100 MΩ ± 5%

Rise Time ≤9 ns

Accuracy

DC Volts ±3% (below 8 kV)

AC Volts

General

Cable Length

Designed for Use in

Operating Environment

Storage Temperature

Humidity

Dimensions

Weight

Warranty

≤80% relative humidity at 104ºF (40ºC)

8 kV (DC + ACpk)

6 kVrms AC

±3% at 1 kHz

±3 dB 0 to 40 MHz

6.6 ft (2 m)

Pollution Degree 2

32ºF to 122ºF (0ºC to 50ºC)

-4ºF to 158ºF (-20ºC to 70ºC)

8.3 in (21 cm)

0.40 lbs (180 g)

One-year warranty

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: caltestelectronics.com.

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5 Voltage Derating Curve

WARNING

When measuring higher frequency signals, be sure to comply with the

Voltage vs Frequency Derating Curve.

Figure 4: Voltage Derating Curve

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6 Cleaning

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

WARNING

Dry the probe thoroughly before attempting to make voltage measurements.

CAUTION Do not subject the probe to solvents or solvent fumes as

these can cause deterioration of the probe body and cables.

7 Service & Warranty Information

Limited One-Year Warranty

Cal Test Electronics warrants this product 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.

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