Elditest CT4076 Manual de usuario
CT4076
User Manual
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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
instrument.
Only qualied personnel should use this probe. This differential
voltage probe is designed to be used by personnel who are
trained, experienced, or otherwise qualied 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 work alone when working with high voltages.
For your own safety, inspect the probe and accessories 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.
The probe should be kept clean and free of any conductive
contamination.
Do not remove the probe casing. Removal of the probe’s casing
may expose you to electric shock.
Do not use the probe with its case open.
Disconnect the inputs and outputs of the probe before opening
the case.
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Use only in ofce-type indoor setting
The instrument is designed to be used in ofce-type indoor
environments. Do not operate the instrument:
zIn the presence of noxious, corrosive, or flammable
fumes, gases, vapors, chemicals, or finely-divided
particulates.
zIn environments where there is a danger of any liquid
being spilled on the instrument.
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 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 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.
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.
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800-572-1028 caltestelectronics.com 3
© 2015 All rights reserved.
ELDITEST is a trademark of Sefram Instruments and Systems
and is licensed for use by Cal Test Electronics.
ELDITEST products are covered by US and foreign patents,
issued and pending. Information is this publication supersedes all
earlier versions. Specications subject to change without notice.
For product information, sales, service, and technical support:
Call: 1-800-572-1028 or visit: caltestelectronics.com
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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Table of Contents Page
1 Introduction .............................................................5
1. Overview ...................................................................................5
2. Features ....................................................................................5
3. Initial Inspection ........................................................................5
2 Product Description..................................................6
1. Front Panel ................................................................................6
3 Using the Probe........................................................6
1. Getting Started ..........................................................................6
2. Vertical Scale on Oscilloscope......................................................7
3. External Power Source................................................................7
4. Using a DMM .............................................................................7
4 Specications ...........................................................8
5 Cleaning ...................................................................9
6 VoltageDeratingCurve ............................................9
7 Service&WarrantyInformation............................10
1. Limited One-Year Warranty .......................................................10
2. Calibration and Repair ..............................................................10
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1 Introduction
1. Overview
Use the CT4076 35-MHz differential probe to make safe and
accurate oating measurements with an oscilloscope. The
CT4076 differential probe allows conventional earth-grounded
oscilloscopes to be used for oating signal measurements of up
to ±7.5 kV for both differential and common mode voltage.
2. Features
z35 MHz bandwidth
zSelectable attenuation settings of 100x or 1000x
zUp to ±7.5 kV differential and common mode voltage
zCompatible with most oscilloscopes
zPowered by included 9 VDC mains adapter
3. Initial Inspection
This unit is tested prior to shipment. It is therefore ready for
immediate use upon receipt. 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 accessories for this product are:
zTwo fully insulated pincer style clips (black & red)
zTwo fully insulated alligator clips (black & red)
zTwo 60 cm input leads (black & red)
zOne 100 cm insulated BNC output cable
zOne 9 V mains adapter
zUser manual
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2 Product Description
1. Front Panel
Figure 1. Front Panel
3 Using the Probe
1. Getting Started
1. Connect the leads to the inputs on the probe.
2. Connect the clips to the leads.
3. Connect the probe to the oscilloscope with the BNC
cable.
4. Connect the probe to the mains adapter.
5. Switch the probe from “OFF” to the desired attenuation
44 mm Input
Safety Banana
Jacks Overload Indicator (Red)
Power On/Off Indicator
(Green)
External Power
Connection
Output BNC Connection
Attenuation Function Switch
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ratio. The power light should come on.
6. Connect the clips to the circuit to be tested.
2. 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 100x, the oscilloscope on 0.5 V/div, the real vertical scale
is 100 x 0.5 = 50 V/div. With the probe on 1000x, the real vertical
scale is 1000 x 0.5 = 500 V/div. These values apply when the
oscilloscope is set to 50 Ω input. When the oscilloscope is set to
1 MΩ input, the actual vertical scale will be halved: 25 V/div for
the 100x probe setting and 250 V/div for the 1000x probe setting.
See the chart below.
Vertical Scale on Oscilloscope
Probe
Output
Impedance
Scope Input
Impedance Probe
Attenuation
Setting
Vertical Scale
Reading on the
Oscilloscope
Actual Vertical Scale
of the Oscilloscope
50 Ω 50 Ω 100x 0.5 V/div 50 V/div
50 Ω 50 Ω 1000x 0.5 V/div 500 V/div
50 Ω 1 MΩ 100x 0.5 V/div 25 V/div
50 Ω 1 MΩ 1000x 0.5 V/div 250 V/div
3. External Power Source
Power consumption of the probe is about 200 mA, thus it is
not suited for battery usage. Use the supplied adapter only.
CAUTION: The probe may be damaged when the input power
exceeds 12 VDC.
4. Using a DMM
Using a DMM rather than an oscilloscope can signicantly
increase your accuracy. Use the CT2944-50 plus the CT3956
converter to use the probe with a DMM.
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4 Specications
All specications apply to the unit after a temperature stabilization time of 15 minutes over an
ambient temperature range of 25 °C ± 5 °C.
CT4076 Specications
Operating Parameters
Bandwidth 35 MHz
Rise Time 10 ns
Attenuation 100x / 1000x
Accuracy ±2%
AC CMRR -80 dB @ 60 Hz
-60 dB @ 100 Hz
-50 dB @ 1 MHz
Input Impedance Between inputs: 50 MΩ // 1.3 pF
Each input to ground: 25 MΩ // 2.6 pF
Input Voltage
Differential Voltage (DC+ACpk) ±750 V / ±7.5 kV
Common-Mode Voltage (DC+ACpk) ±7.5 kV or 5.5 kVrms
Absolute Max Voltage (DC+ACpk) ±7.5 kV or 5.5 kVrms
Output Voltage
Swing ±8 V (±4 V into 50 Ω load)
Source Impedance 50 Ω
General
Power Supply External 9 VDC power supply
Power Consumption 200 mA about (9 VDC)
Operating Temperature/Humidity 0°C to 50°C / 10% to 85% RH
Storage Temperature/Humidity -30°C to 70°C / 10% to 90% RH
Cable Length 100 cm
Input Leads Length 60 cm each
Weight 350 g
Dimensions 220 x 85 x 30 mm
Specications 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 Cleaning
This probe does not require any particular cleaning. If necessary,
clean the case with a cloth slightly moistened with soapy water
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.
6 Voltage Derating Curve
The derating curve of the absolute maximum input voltage in
common mode is show as follows:
Figure 2. CT4076 Derating Curve
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