Cal Test Electronics CT4028 User Manual Download Page 2

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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.

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 

Summary of Contents for CT4028

Page 1: ...CT4028 User Manual ...

Page 2: ...ategory 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 Do not apply to the input any potential that exceeds the maximum rating of the probe For your own safety inspect the probes ...

Page 3: ... liquid being spilled on the instrument z z In air temperatures exceeding the specified operating temperatures z 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 specifications if the instrument is used in non office type environments Such envi...

Page 4: ...s 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 ...

Page 5: ...028 is a 39 kV High Voltage divider probe for use with both digital and analog oscilloscopes Features z Measures up to 39 kV DC ACpk or 27 kVrms AC z DC to 220 MHz bandwidth z Voltage dividing of 1000 1 z Frequency compensation Probe Accessories Figure 1 CT4028 Probe Accessories ...

Page 6: ...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 A...

Page 7: ...nd 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 wav...

Page 8: ... a flat topped square wave Figure 4 Figure 3 Frequency Compensation Trimmer 200 kHz and Bandwidth Adjustments 4 CAUTION 200 kHz and bandwidth adjustments should only be made by a qualified engineer Remove the plastic cover to access these trimmers 5 Change the square wave output to 200 kHz or to the frequency you will be using in your testing 6 Turn the 200 kHz Trimmer for a flat topped square wav...

Page 9: ...2 1028 caltestelectronics com 4 Figure 4 shows how over and under compensated pulse responses will look Figure 4 Over Under Compensation Figure 5 shows a perfectly compensated probe Figure 5 Good Compensation ...

Page 10: ...stance 900 MΩ Input Capacitance 2 0 pF Rise Time 1 6 ns Signal Noise 60 dB 1 KHz 50 dB 1 MHz Accuracy DC Volts 3 0 to 35 kV Accuracy AC Volts 3 at 1 kHz Cable Length 6 6 ft 2 m Designed for Use in Pollution Degree 2 Operating Environment 14ºF to 131ºF 10ºC to 55ºC Storage Temperature 4ºF to 158ºF 20ºC to 70ºC Humidity 85 relative humidity at 95ºF 35ºC Dimensions 3 1 x 3 1 x 12 6 in 8 x 8 x 32 cm W...

Page 11: ...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 ...

Page 12: ...ersons will not be covered by this warranty Cal Test Electronics 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 employ...

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Page 16: ... 2018 Cal Test Electronics 450895 001 Rev A ...

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