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Probing Principles

AC and DC Coupling

You can couple the signal input to the oscilloscope with either DC or AC coupling. DC coupling shows both the DC and AC
measurement components. AC coupling removes the DC component from the displayed signal.

1.

This low-frequency square wave is
displayed using AC coupling. The signal
exhibits low-frequency rolloff.

2.

Press the DC Coupling button to display
the waveform as truly square.

CAUTION.

When you use AC coupling, make

sure that the input DC current does not exceed
the probe speci

fi

cations.

34

TCP0030A Current Probe Instruction Manual

Summary of Contents for TCP0030A

Page 1: ...TCP0030A 120 MHz 30 Amp AC DC Current Probe ZZZ Instruction Manual xx www tek com 071 3006 01...

Page 2: ...ued and pending Information in this publication supersedes that in all previously published material Specifications and price change privileges reserved TEKTRONIX and TEK are registered trademarks of...

Page 3: ...taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and...

Page 4: ......

Page 5: ...xiii Preface xiv Documentation xiv Conventions Used in this Manual xiv Returning the Probe for Servicing xv Key Features 1 Installation 2 Degauss the Probe 3 Controls and Indicators 5 Probe Slider and...

Page 6: ...Magnetic Field Errors 33 AC and DC Coupling 34 Maximum Current Limits 35 Accessories and Options 39 Optional Accessories 41 Options 44 Specifications 45 Warranted Characteristics 45 Typical Characteri...

Page 7: ...Contents Adjustments 64 Equipment Required 64 Equipment Setup 64 DC Gain Accuracy 65 High Frequency Response 67 Maintenance 68 Troubleshooting 68 Cleaning 70 Index TCP0030A Current Probe Instruction M...

Page 8: ...Table of Contents iv TCP0030A Current Probe Instruction Manual...

Page 9: ...nect the probe reference lead to the circuit under test before connecting the probe input Disconnect the probe input and the probe reference lead from the circuit under test before disconnecting the p...

Page 10: ...y or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property Symbols and terms on the product These terms may appear on t...

Page 11: ...General safety summary The following symbol s may appear on the product TCP0030A Current Probe Instruction Manual vii...

Page 12: ...ble of rendering first aid and resuscitation is present Disconnect power To avoid electric shock switch off the instrument power then disconnect the power cord from the mains power Use care when servi...

Page 13: ...ow Voltage Directive 2006 95 EC EN 61010 1 2001 Safety requirements for electrical equipment for measurement control and laboratory use EN 61010 2 032 2002 Particular requirements for handheld current...

Page 14: ...lectrical measurement and test equipment Additional Compliances IEC 61010 1 2001 Safety requirements for electrical equipment for measurement control and laboratory use IEC 61010 031 2002 Particular r...

Page 15: ...e expected This location is a typical office home environment Temporary condensation occurs only when the product is out of service Pollution Degree 3 Conductive pollution or dry nonconductive polluti...

Page 16: ...formed in the building installation Measurement Category II For measurements performed on circuits directly connected to the low voltage installation Measurement Category I For measurements performed...

Page 17: ...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 in an appropriate system that...

Page 18: ...Operation Functional Check Operating Basics Specifications Performance Verification Read this Instruction Manual In depth oscilloscope operation user interface help GPIB commands Access the online he...

Page 19: ...carton having inside dimensions at least one inch greater than the probe dimensions The box should have a carton test strength of at least 200 pounds 2 Put the probe into an antistatic bag or wrap it...

Page 20: ...Preface xvi TCP0030A Current Probe Instruction Manual...

Page 21: ...DC Measurement capability 50 A peak pulse current pulse widths 10 s 5 A and 30 A range settings 1 mA sensitivity on TekVPI oscilloscopes that support the 1 mV div setting 1 DC Accuracy typical One bu...

Page 22: ...be jaw Damage to the probe may result Connect to the Host Instrument 1 Slide the probe into the TekVPI receptacle The probe snaps in when fully engaged 2 To disconnect press the latch button and pull...

Page 23: ...red 2 To degauss the probe first verify that the probe jaw is closed and then press the Degauss AutoZero button on the probe or in the Degauss window on the host instrument NOTE The DC gain and offset...

Page 24: ...ases After you turn on the measurement system and allow a 20 minute warm up period Before you connect the probe to a conductor Whenever a current or thermal overload condition occurs Whenever you subj...

Page 25: ...robe and take measurements 2 Move the slider to the unlocked position to insert and remove conductors to and from the conductor jaw 3 The jaw can accept a 5 mm 0 2 in diameter maximum conductor size W...

Page 26: ...cess the area beyond the safe handling zone indicated by the shaded area when you take measurements WARNING To prevent probe damage do not drop the probe or subject it to impact WARNING Do not connect...

Page 27: ...ve EMI rejection at high frequencies 1 Clip the ground lead to the ground post at the bottom of the probe head 2 Connect the alligator end of the clip to the circuit ground 3 Clamp the probe around th...

Page 28: ...ugged in all of the indicator LEDs light briefly and then the Degauss AutoZero LED flashes to alert you to degauss the probe One of the Range LEDs remains lit to indicate the current range selected NO...

Page 29: ...ows the probe slider is unlocked 2 Close the probe slider to accurately measure current or to degauss the probe CAUTION Do not measure conductors larger than 5 0 mm 0 20 in diameter Damage to the prob...

Page 30: ...ing temperature of the probe has been exceeded Flashes red and orange both the maximum input continuous current limit and the safe operating temperature of the probe have been exceeded CAUTION Do not...

Page 31: ...Press the Range button to select between the 5 A and 30 A current range settings The green LEDs indicate the range selected The range and units are also displayed on the oscilloscope screen TCP0030A...

Page 32: ...uaranteed when this LED flashes orange The Degauss AutoZero function also clears AutoZeroes any DC offset in the probe To degauss the probe do the following 1 Disconnect the probe from the current sou...

Page 33: ...this example 1 Press the Menu button on the probe The lower bezel menu appears at the bottom of the screen above the lower bezel buttons 2 Press the More button on the oscilloscope to scroll through t...

Page 34: ...tween the fixed 1 2 5 scales on many oscilloscopes For example to display a 320 mA signal over exactly 8 vertical divisions 40 mA div first set the fixed scale to 50 mA div Next select Fine Scale from...

Page 35: ...Probe Setup menu displays probe settings and functional buttons Use the side bezel buttons to initiate routines such as Degauss and Deskew The buttons also display the degauss status of the probe TCP0...

Page 36: ...al deskew fixture See page 43 Deskew Calibration Fixture The deskew procedure measures the channel to channel delay time including the probes and provides manual and automatic steps to align the delay...

Page 37: ...insert conductors larger than 5 mm 0 20 in diameter into the probe jaw Damage to the probe may result To check that your probe functions correctly do the following 1 Connect the probe to any channel...

Page 38: ...to the Maintenance section of this manual for information on how to properly clean the probe head transformer surfaces 1 Check the oscilloscope display before connecting the probe to a conductor If th...

Page 39: ...ments connect the probe ground lead to the probe ground connector and attach the alligator clip directly to RF ground to improve EMI rejection In some cases it may be helpful to move the ground lead o...

Page 40: ...ion Examples Application Examples This section explains ways to use your probe in common troubleshooting tasks and how to extend the use of your measurement system 20 TCP0030A Current Probe Instructio...

Page 41: ...ely low output impedance connected to an inductor that has low resistance 1 Connect the inductor across the output terminals of the pulse generator 2 Maintain a constant voltage across the inductor 3...

Page 42: ...ned by the slope of the current ramp shown here 5 Calculate the inductance using the following formula where L is the inductance in henries E is the voltage of the pulse generator dt is the change in...

Page 43: ...y the time constant of the charge curve The current ramp shows how the values for the inductance formula are obtained Use this formula to calculate the inductance based on the current measurement wher...

Page 44: ...ent limited source as shown 2 Measure the input current on one of the inductor leads 3 Clamp the current probe around the inductor and note the current value The number of turns is equal to the ratio...

Page 45: ...e test coil into the current probe so that the currents oppose each other as shown You must observe the polarity of coil current to determine whether the test coil has less or more turns than the refe...

Page 46: ...he conductor in the probe jaws is completely unpowered Any current flowing through the conductor will cause a residual offset in the current probe and may cause an inaccurate measurement or an error c...

Page 47: ...e two conductors in one current probe WARNING Do not force the slide closed Damage to the probe may result If you cannot close the slide around the conductor s either reduce the number of conductors y...

Page 48: ...onductors Be careful not to pinch a conductor in the probe jaws 3 Measure the current Conventional current flows from positive to negative A waveform above the baseline indicates that the conductor wi...

Page 49: ...NING To avoid personal injury or equipment damage do not exceed the specified electrical limits of the probe or any applicable accessories When using multiple conductors do not exceed current limits o...

Page 50: ...e probe jaw with the conductor under test 2 Orient the second conductor so that the bucking current flows in the opposite direction of the DC flow in the conductor under test 3 To determine measuremen...

Page 51: ...cking current is equal to the current flowing in the conductor multiplied by the number of turns wound around the probe For example if the second conductor has a current of 100 mA DC and is wrapped ar...

Page 52: ...l is multiplied by the number of turns around the probe 2 To obtain the actual current value divide the displayed amplitude by the number of turns For example if a conductor is wrapped around the prob...

Page 53: ...at high frequencies and strong magnetic fields on the supply side of your circuit can cause measurement errors To avoid this 1 Measure on the low or ground side of your circuit 2 Orient the probe to m...

Page 54: ...ling removes the DC component from the displayed signal 1 This low frequency square wave is displayed using AC coupling The signal exhibits low frequency rolloff 2 Press the DC Coupling button to disp...

Page 55: ...robe See Table 2 on page 46 Maximum Pulsed Current ImaxP is the maximum peak value of pulsed current the probe can accurately measure regardless of how short within bandwidth limitations the pulse dur...

Page 56: ...your measurement exceeds the Ampere second product you must first determine the maximum allowable pulse width or maximum allowable pulse amplitude as described in the following section NOTE Always deg...

Page 57: ...mpere second or Ampere microsecond specification for the range setting of the TCP0030A probe by the measured peak current of the pulse The quotient is the maximum allowable pulse width PWmax 3 Check t...

Page 58: ...of the TCP0030A probe by the pulse width The quotient is the maximum allowable pulse amplitude the peak amplitude of the measured pulse must be less than this value For example the TCP0030A probe has...

Page 59: ...fications are provided where appropriate so that you can choose the accessory that best fits your needs Probe Ground Lead 1 Fasten the small clip to the ground stub on the probe body 2 Clip the alliga...

Page 60: ...nce instructions Reorder Tektronix part number 071 3006 xx Manuals in the languages listed below are available for this product Other languages may also be available check the Tektronix Web site at ww...

Page 61: ...rent Loop Use the 1 turn 50 current loop for the performance verification procedures The BNC connector allows for easy connections to current sources To use the current loop follow the procedure for t...

Page 62: ...cedures on the probe It provides power to the probe and routes the probe output signal out through an SMA connector on the back of the fixture The signal can then be measured with another instrument s...

Page 63: ...probe calibration or deskew procedures The deskew procedures compensate for gain errors and timing differences between current and voltage probes Refer to your oscilloscope manual or fixture documenta...

Page 64: ...ibration Service 3 years Option C5 Calibration Service 5 years Option D1 Calibration Data Report Option D3 Calibration Data Report 3 years with Option C3 Option D5 Calibration Data Report 5 years with...

Page 65: ...e Table 1 Specifications for the TCP0030A current probe fall into three categories warranted typical and nominal characteristics Warranted Characteristics Warranted characteristics describe guaranteed...

Page 66: ...y 5 A Range 5 A RMS 30 A Range 30 A RMS 42 4 A peak See Figure 3 on page 49 Maximum peak current 50 A maximum peak pulse See Figure 3 on page 49 Displayed RMS noise 75 A RMS Limit measurement bandwidt...

Page 67: ...Specifications Figure 1 Frequency derating peak current versus frequency TCP0030A Current Probe Instruction Manual 47...

Page 68: ...Specifications Figure 2 Typical input impedance versus frequency 48 TCP0030A Current Probe Instruction Manual...

Page 69: ...Specifications Figure 3 Maximum peak pulse versus pulse width TCP0030A Current Probe Instruction Manual 49...

Page 70: ...at 30 C to 75 C 86 F to 167 F Altitude Operating Up to 3000 meters 10 000 feet Nonoperating Up to 12 192 meters 40 000 feet Table 4 Typical mechanical characteristics Characteristic Description Dimen...

Page 71: ...Specifications TCP0030A Current Probe Instruction Manual 51...

Page 72: ...traits do not have tolerance limits Table 5 Nominal electrical characteristics Characteristic Description Input coupling DC Current ranges 5 A and 30 A Termination Terminate output into 1 M Compatibil...

Page 73: ...t follow verify the warranted specifications of the probe listed below The recommended calibration interval is one year DC gain accuracy Rise time Bandwidth Perform the following verification procedur...

Page 74: ...accuracy 0 to 1 5 V square wave output ACA 0 25 accuracy 0 to 6 A square wave output Fluke 9100 DMM 2 volt range 1 accuracy Keithley 2700 TekVPI Calibration Verification adapter TekVPI interface 067...

Page 75: ...ximately 3 inches in diameter 1 Wind exactly 5 turns of 18 coated wire around the form 2 Scrape about a half inch of coating off of the ends of the wire NOTE Ensure that the current loop has exactly 5...

Page 76: ...to any channel 1 4 of the oscilloscope 3 Close the probe slider and then press the Degauss AutoZero button 4 Set the oscilloscope coupling to DC 5 Power on the current source and the pulse generator 6...

Page 77: ...C F adapter to the SMA output of the TekVPI Calibration Verification adapter 3 Connect the BNC cable between the BNC adapter on the TekVPI Calibration Verification adapter and the BNC adapter attached...

Page 78: ...tion 7 Degauss the probe by pressing the Degauss AutoZero button 8 Connect the 5 turn current loop to the current source and then clamp the current probe around the current loop as shown The arrow ind...

Page 79: ...he output of the current source 13 Record the exact measurement of the DMM as M1 14 Set the current source output to 0 50 A 15 Record the exact measurement of the DMM as M2 16 Compute the Error using...

Page 80: ...rrent source output to 3 00 A 21 Record the exact measurement of the DMM as M2 22 Compute the Error using the measured amplitude values and the formula shown 23 Record the computed Error values in the...

Page 81: ...any channel 1 4 2 Connect the BNC cable to the output of the pulse generator using a BNC to SMA adapter if necessary 3 Connect the other end of the BNC cable to the HF current loop 4 Set the pulse ge...

Page 82: ...NOTE If the measured rise time is out of tolerance you may be able to readjust it See page 64 Adjustments 10 Calculate the probe bandwidth using the measured rise time in the following formula 11 Reco...

Page 83: ...cian Performance test Range Test Current Expected output Minimum Incoming Outgoing Maximum 5 A 2 5 A 2 50 V 3 3 DC Gain Accuracy 30 A 15 A 1 50 V 3 3 5 A 1 A 2 92 ns NA 2 92 ns Rise time 30 A 1 A 2 92...

Page 84: ...cation procedure for the equipment required You also need an insulated flat bladed adjustment tool The tool is available from Tektronix order part number 003 1433 00 Equipment Setup Refer to the Perfo...

Page 85: ...er Adjust the 5 A Range 1 Complete the DC Gain Accuracy test in the Performance Verification procedure See page 57 DC Gain Accuracy If the measurements fall outside the test limits proceed to the next...

Page 86: ...be range to 30 A 5 Set the calibrator output to 3 0 A 6 Adjust the 30 A DC gain control in the probe compensation box to display 1 50 V 0 045 V on the DMM 7 Disconnect the probe from the current sourc...

Page 87: ...e the final adjustment between the two characteristics 1 Complete the Rise Time and Bandwidth test in the Performance Verification procedure If the measurements fall outside the test limits proceed to...

Page 88: ...se LEDs on the probe flash or remain on Jaw Open Continuous red The conductor jaw is unlocked Move the slider forward to lock the jaw closed Overload Flashing An intermittent repetitive overload is pr...

Page 89: ...illoscope the contacts on the input channel that exhibits the problem may need to be cleaned Refer to your oscilloscope manual for the proper cleaning procedure If the probe does not work on another c...

Page 90: ...void using chemicals that contain benzine benzene toluene xylene acetone or similar solvents Clean the exterior surfaces of the probe with a dry lint free cloth or a soft bristle brush If dirt remains...

Page 91: ...ling 34 gain accuracy adjustment 65 gain accuracy check 57 Degaussing 3 while connected to a conductor 26 Deskew menu 16 Differential current 27 Documentation xiv E Equipment required performance veri...

Page 92: ...menu 14 Options 44 P Performance verification 53 Position menu 14 Probe controls and indicators 8 coupling 34 extending the current range 29 increasing the current limit 29 maximum current limits 35 s...

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