Elditest CT4028 Manual de usuario
CT4028
User Manual
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© 2015 All rights reserved.
Elditest is a trademark of Sefram Instruments and
Systems.
Elditest products are covered by US and foreign
patents, issued and pending. Information is this
publication supersedes all earlier versions.
Specifications subject to change without notice.
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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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 qualified personnel should use this
probe. This high voltage probe is designed
to be used by personnel who are trained,
experienced, or otherwise qualified 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
between the probe and circuit-under-test
when measuring voltages ≥30kV (DC +
ACpk) or 20kV (ACrms). It is recommended
to wait an interval of 5 minutes between
such measurements.
Do not work alone when working with high
voltages.
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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, floor 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 expose
you to electric shock.
Keep fingers behind the probe’s finger
guard during use.
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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 office-type indoor setting
The instrument is designed to be used in
office-type indoor environments. Do not
operate the instrument:
•In the presence of noxious, corrosive,
or flammable fumes, gases, vapors,
chemicals, or finely-divided
particulates.
•In environments where there is a
danger of any liquid being spilled on
the instrument.
•In air temperatures exceeding the
specified operating temperatures.
•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 specifications if
the instrument is used in non-office-type
environments. Such environments may
include rapid temperature or humidity
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changes, sunlight, vibration and/or
mechanical shocks, acoustic noise,
electrical noise, strong electric fields, or
strong magnetic fields.
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.
AWARNING 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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Table of Contents
1General Information 6
1.1 Product Overview 6
1.2 Features 6
1.3 Accessories 7
2Using the Probe 8
3Frequency Compensation 9
3.1 200 Hz Adjustment 10
3.2 200 kHz and Bandwidth Adjustments 10
4Specifications 12
5Voltage Derating Curve 13
6Cleaning 13
7Service & Warranty Information 14
7.1 Limited One-Year Warranty 14
7.2 Calibration and Repair 15
1 General Information
1.1 Product Overview
The Elditest CT4028 is a 39 kV High
Voltage divider probe for use with both
digital and analog oscilloscopes.
1.2 Features
•Measuresup to: 39 kV (DC + ACpk)or
27 kVrms AC
•DC to 220 MHz bandwidth
•Voltage dividing of 1000:1
•Frequency compensation
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1.3 Accessories
1. Grounding Alligator Clip
2. High Voltage Isolation Head (for use
with ≥25 kV)
3. Trimmer Tool
4. Grounding Lead Extension Cable
5. Frequency Compensation Trimmers
6. BNC Cable
7. Main Grounding Lead
8. Hands-Free Bolt-On Probe Tip
9. Standard Probe tip
10. Hands-Free Hook Probe Tip
Figure 1: CT4028 Probe Accessories
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2 Using the Probe
1. Connect the probe to the BNC input of
the oscilloscope.
2. On the oscilloscope, select the desired
volts/division range. Whenever
available, set the probe attenuation
ratio setting to 1000:1.
3. WARNING If possible, always turn the
high voltage source off before
connecting or disconnecting the probe.
4. WARNING Connect the probe
grounding lead (via alligator clip) to a
good earth ground or reliable chassis
ground.
5. For the best frequency response,
when measuring frequencies > 40
MHz use only the Main Grounding
Lead plus the Grounding Alligator Clip.
(Figure 1). For frequencies < 40 MHz
the Grounding Lead Extension Cable
may be used and will give you better
reach with the probe.
6. WARNING Before turning on the high
voltage source, be certain the operator
is not touching any part of the device
under test.
7. Turn on the high voltage source.
8. You will now be able to analyze the
voltage waveform on your
oscilloscope.
9. WARNING Always attach the High-
Voltage Isolation Head to the probe
when working with voltages ≥25 kV.
Gently turn the head clockwise to
screw onto the tip of the probe. See
Figure 2.
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10. CAUTION Do not exceed 60 seconds
of contact between the probe and
circuit-under-test when measuring
voltages ≥30 kV (DC + ACpk) or ≥20
kV (ACrms). It is recommended to wait
an interval of 5 minutes between such
measurements.
11. Turn off the high voltage source.
12. WARNING Disconnect the probe from
the high voltage source BEFORE
disconnecting the ground clip lead.
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.
Figure 2: High Voltage Isolation Head
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