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Probing Principles

Increasing Sensitivity

If you are measuring DC or low-frequency
AC signals of very small amplitudes, you can
increase measurement sensitivity of your
Current Probe by doing the following:

Wind several turns of the conductor under
test around the probe as shown. The
signal is multiplied by the number of turns
around the probe.

To obtain the actual current value, divide
the displayed amplitude by the number of
turns.

For example, if a conductor is wrapped around
the probe three times and the oscilloscope
shows a reading of 3 mA DC, the actual current

ow is 3 mA divided by 3, or 1 mA DC.

NOTE.

Winding more turns around the probe increases the insertion impedance and reduces the upper bandwidth limit of the probe.

20 A Current Probes Instruction Manual

Содержание TCP0020

Страница 1: ...x TCP0020 TCP2020 50 MHz 20 Amp AC DC Current Probes ZZZ Instruction Manual P071300200 071 3002 00...

Страница 2: ......

Страница 3: ...TCP0020 TCP2020 50 MHz 20 Amp AC DC Current Probes ZZZ Instruction Manual xx Revision A www tektronix com 071 3002 00...

Страница 4: ...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 Tek...

Страница 5: ...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...

Страница 6: ......

Страница 7: ...cations and Compliances xii Environmental Considerations xv Preface xvii Documentation xvii Conventions Used in This Manual xvii Returning the Probe for Servicing xviii Key Features 1 Installation 3 D...

Страница 8: ...he Jaws 34 Measuring Differential Current 35 Extending Current Range 37 Increasing Sensitivity 40 Common Mode Noise Magnetic Field Errors 41 AC and DC Coupling 42 Maximum Current Limits 43 Application...

Страница 9: ...d 62 Making the DC Current Loop 63 Equipment Setup 64 DC Gain Accuracy 65 Rise Time and Bandwidth 69 Test Record 71 Adjustments 72 Prerequisites 72 DC Gain Accuracy 73 Maintenance 74 Troubleshooting 7...

Страница 10: ...Table of Contents iv 20 A Current Probes Instruction Manual...

Страница 11: ...under test before connecting or disconnecting the current probe Connect and disconnect properly Connect the probe output to the measurement instrument before connecting the probe to the circuit under...

Страница 12: ...ot operate this product with covers or panels removed Do not operate with suspected failures If you suspect that there is damage to this product have it inspected by qualified service personnel Avoid...

Страница 13: ...ditions or practices that could result in damage to this product or other property Symbols and terms on the product These terms may appear on the product DANGER indicates an injury hazard immediately...

Страница 14: ...General safety summary The following symbol s may appear on the product viii 20 A Current Probes Instruction Manual...

Страница 15: ...apable 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 se...

Страница 16: ...ities EN 61326 1 2006 EMC requirements for electrical equipment for measurement control and laboratory use 1 2 3 CISPR 11 2003 Radiated and conducted emissions Group 1 Class A IEC 61000 4 2 2001 Elect...

Страница 17: ...ct 3 For compliance with the EMC standards listed here high quality shielded interface cables should be used 4 Performance Criterion C applied at the 70 25 cycle Voltage Dip and the 0 250 cycle Voltag...

Страница 18: ...ment and test equipment U S Nationally Recognized Testing Laboratory Listing UL 6010B 2 032 2003 Particular requirements for handheld current clamps for electrical measurement and test equipment UL 61...

Страница 19: ...al environment inside a product is considered to be the same as the external Products should be used only in the environment for which they are rated Polution Degree 1 No pollution or only dry noncond...

Страница 20: ...either temperature nor humidity is controlled The area is protected from direct sunshine rain or direct wind Polution Degree 4 Pollution that generates persistent conductivity through conductive dust...

Страница 21: ...nvironment and to reduce the use of natural resources we encourage you to recycle this product in an appropriate system that will ensure that most of the materials are reused or recycled appropriately...

Страница 22: ...Compliance Information xvi 20 A Current Probes Instruction Manual...

Страница 23: ...irst Time Operation Functional Check Operating Basics Specifications Performance Verification Read this Instruction Manual In depth oscilloscope operation user interface help GPIB commands Access the...

Страница 24: ...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...

Страница 25: ...TCP0020 Current Probe AC coupling on TekVPI oscilloscopes that support AC coupling 10 mA sensitivity on TekVPI oscilloscopes that support the 1 mV div setting 100 A peak pulse current pulse widths 10...

Страница 26: ...20 A RMS continuous rating de rated with frequency 100 A peak pulse current pulse widths 10 s 1 DC accuracy typical One button degauss 150V CAT II Bare wire 300V CAT II Insulated wire External power s...

Страница 27: ...l check and then the Degauss LED flashes red to indicate a degauss is required The 50 Term LED glows green until the degauss is run when the probe senses and adjusts per the host attenuation setting 2...

Страница 28: ...connect it to the probe NOTE The AC adapter can also be connected to the probe before connecting the probe to the oscilloscope When the probe is connected to the oscilloscope and the AC adapter the p...

Страница 29: ...cilloscope screen display may also prompt you to degauss the probe The TCP2020 probe does not indicate that a degauss is needed but you should always degauss a current probe after connecting it to the...

Страница 30: ...ermination is set for proper current measurements NOTE The DC gain and offset errors are not guaranteed when the multicolor Degauss AutoZero status LED flashes red 4 The multicolor Degauss AutoZero st...

Страница 31: ...cases 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 sub...

Страница 32: ...follow Probe Head Slider and Conductor Jaw 1 When the slider is in the locked position you can degauss the probe and take measurements 2 Move the slider to the unlocked position to insert and remove c...

Страница 33: ...access 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 conne...

Страница 34: ...Power On Indication When the TCP0020 probe is powered on all of the indicator LEDs light briefly and then the Degauss AutoZero LED on the probe flashes red to indicate that a degauss is required Afte...

Страница 35: ...obe slider forward to lock it and to turn off the LED In the locked position you can degauss the probe or when connected to a conductor accurately measure current CAUTION Do not measure conductors lar...

Страница 36: ...ED glows red the maximum input continuous current limit has been exceeded CAUTION Do not subject the probe to conditions that cause the Overload LED to light for extended periods Quick Tip An input cu...

Страница 37: ...o degauss the probe do the following 1 Disconnect the probe from any conductors and then close and lock the slider 2 Press the Degauss AutoZero button to initiate the degauss routine After successfull...

Страница 38: ...robe The Degauss AutoZero function also nulls any DC offset in the probe If the LED flashes orange you should degauss the probe The DC gain and offset errors are not guaranteed when this LED flashes o...

Страница 39: ...termination while the probe is connected to the oscilloscope When you connect the probe to a 1M input host the 50 Term LED lights after you degauss the probe When the probe is connected to a 50 input...

Страница 40: ...e is used in 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 to scroll through the lowe...

Страница 41: ...etween 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 fro...

Страница 42: ...lays the current range and attenuation 20 amperes and 10X for the TCP0020 and TCP2020 probes Side bezel buttons allow you to run the Degauss and AutoZero routines The buttons also display the degauss...

Страница 43: ...optional deskew fixture See page 30 Deskew Calibration Fixture The deskew procedure measures the channel to channel delay time including the probes and provides manual and automatic steps to align th...

Страница 44: ...e is powered by an external DC power supply that is included with the probe NOTE The probe will pass through AC signals without the external power supply connected but the performance is not guarantee...

Страница 45: ...be To degauss the probe do the following 1 Disconnect the probe from the current source 2 Close and lock the slider 3 Press the Degauss button to initiate the degauss routine A decaying oscillation ap...

Страница 46: ...obe slider forward to lock it and to turn off the LED In the locked position you can degauss the probe or when connected to a conductor accurately measure current CAUTION Do not measure conductors lar...

Страница 47: ...mA div or the most sensitive setting on the instrument 5 Open and close the probe slider 6 Adjust the Balance control to zero the displayed signal NOTE If you cannot set the DC offset to zero with th...

Страница 48: ...ess Do not insert conductors larger than 5 0 mm 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 chan...

Страница 49: ...the standard and optional accessories available for the probe and provides information on how to use the accessories Specifications are provided where appropriate so that you can choose the accessory...

Страница 50: ...e Ground Lead 1 Fasten the small clip to the ground stub on the probe body 2 Clip the alligator clip to your circuit ground 3 Attach the probe to your circuit Reorder Tektronix part number 196 3521 xx...

Страница 51: ...e accessories and manual in the carrying case 2 Close the carrying case to transport the accessories to another location or for storage Reorder Tektronix part number 016 1952 xx DC Power Supply TCP202...

Страница 52: ...nance instructions Reorder Tektronix part number 071 3002 xx Manuals in the languages listed below are available for this product Other languages may also be available check the Tektronix Web site at...

Страница 53: ...e performance verification procedures The BNC connector allows for easy connections to current sources and the conductor bar inside the fixture fits in the jaw of the current probe To use the current...

Страница 54: ...he 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 docume...

Страница 55: ...on 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 Option C5 Option R3 Repair S...

Страница 56: ...how to properly clean the probe head transformer surfaces 1 Check the oscilloscope display before connecting the probe to a conductor If there is a DC offset degauss the probe See page 5 Degaussing th...

Страница 57: ...the ground lead to improve 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 20...

Страница 58: ...ctor 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 condition...

Страница 59: ...or Do not exceed the 300 V CAT II voltage rating on any insulated conductor An insulated conductor is any conductor that is surrounded by an insulating material that is capable of isolating the voltag...

Страница 60: ...conductors 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 w...

Страница 61: ...methods WARNING 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 curr...

Страница 62: ...he 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 measureme...

Страница 63: ...bucking 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...

Страница 64: ...nal 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 pr...

Страница 65: ...ide 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 measure conventional current flow from positive to negative NOT...

Страница 66: ...ent from the displayed signal Use your oscilloscope controls to change the coupling 1 This low frequency square wave is displayed using AC coupling The signal exhibits low frequency rolloff 2 Press th...

Страница 67: ...probe See Table 2 on page 54 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 d...

Страница 68: ...f 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 d...

Страница 69: ...e 2 Divide the Ampere second or Ampere microsecond specification for the probe by the measured peak current of the pulse The quotient is the maximum allowable pulse width PWmax 3 Check that the pulse...

Страница 70: ...ange setting of the 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 TCP0020 and TCP...

Страница 71: ...tion 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 A Current Probes Instruction Man...

Страница 72: ...mely 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...

Страница 73: ...fined 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 i...

Страница 74: ...by 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 wh...

Страница 75: ...rrent 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 rati...

Страница 76: ...he 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 ref...

Страница 77: ...not exceed the limits described See Table 1 The probe has been degaussed successfully Specifications for the TCP0020 TCP2020 current probes fall into three categories warranted typical and nominal ch...

Страница 78: ...50 oscilloscope termination 50 A maximum peak pulse pulse width 20 s TCP0020 TCP2020 with 1 M oscilloscope termination 100 A maximum peak pulse pulse width 10 s Displayed RMS noise 1 0 mA RMS limit me...

Страница 79: ...Specifications Figure 1 Frequency derating continuous peak current versus frequency 20 A Current Probes Instruction Manual 55...

Страница 80: ...Specifications Figure 2 Typical insertion impedance versus frequency 56 20 A Current Probes Instruction Manual...

Страница 81: ...Specifications Figure 3 Maximum peak pulse versus pulse width 20 A Current Probes Instruction Manual 57...

Страница 82: ...feet Nonoperating Up to 12 192 meters 40 000 feet Table 4 Typical mechanical characteristics Characteristic TCP0020 TCP2020 Compensation box See Figure 4 on page 59 77 mm 30 5 mm 40 6 mm 4 2 in 1 6 i...

Страница 83: ...Specifications Figure 4 Mechanical dimensions 20 A Current Probes Instruction Manual 59...

Страница 84: ...upling DC Current range 20 A Power requirement TCP0020 TCP2020 Supplied by host instrument External 12 VDC 300 mA 100 240 VAC 50 60 Hz 0 5 A input Termination TCP0020 TCP2020 Terminate output into 50...

Страница 85: ...hat 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 proced...

Страница 86: ...cy 0 to 1 5 V square wave output ACA 0 25 accuracy 0 to 6 A square wave output Fluke 9100 TekVPI Calibration Verification adapter 2 TekVPI interface 067 1701 xx Digital multimeter DMM 2 volt range 1 a...

Страница 87: ...roximately 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...

Страница 88: ...channel of the oscilloscope If you are testing a TCP2020 probe connect the external DC power supply to the probe 3 Degauss the probe 4 Set the oscilloscope coupling to DC 5 Power on the remaining test...

Страница 89: ...test record refer to the Adjustments section See page 72 TCP2020 Setup 1 Connect a BNC to Dual Banana adapter to the digital multimeter DMM input 2 Connect the TCP2020 probe output to the BNC adapter...

Страница 90: ...ct the BNC cable between the BNC adapter on the TekVPI Calibration Verification adapter and the BNC adapter attached to the DMM 4 Connect the TekVPI Calibration Verification adapter to any channel 1 4...

Страница 91: ...on 8 Connect the 5 turn current loop to the current source and then clamp the current probe around the 5 turn current loop as shown The arrow indicator on the probe should point away from the terminal...

Страница 92: ...ge Ve 1 00 V 1 mV 10 mA 15 Compute the Error using the measured amplitude values and the formula shown For example you might measure values of 0 975 V for M1 and 0 995 V for M2 With an expected output...

Страница 93: ...e to the output of the pulse generator 2 Connect the other end of the BNC cable to the HF current loop 3 Set the pulse generator output and pulse width to maximum 50 Vp p positive pulse 100 ns duratio...

Страница 94: ...be points away from the pulse generator 8 The rise time is displayed on the oscilloscope Record the rise time measurement in the Test Record 9 Calculate the probe bandwidth using the measured rise tim...

Страница 95: ...e Date of Calibration Certificate Number RH Technician Performance test Test current Expected output Minimum Incoming Outgoing Maximum DC gain accuracy 10 0 A 1 000 V 3 3 Rise time 1 A 7 0 ns NA 7 0 n...

Страница 96: ...acy Prerequisites Complete the DC Gain Accuracy Test in the Performance Verification procedure See page 65 DC Gain Accuracy Keep the test setup intact for the adjustment procedure CAUTION To avoid ESD...

Страница 97: ...setup intact to perform the adjustment 1 Set the calibrator output to 2 0 A 2 Set the digital multimeter DMM to measure DC volts 2 0 V range 3 Measure the output amplitude on the DMM 4 Access the DC...

Страница 98: ...k properly an error condition may exist See the following table Table 7 Probe troubleshooting Symptom Possible cause LEDs on the probe flash or remain on Jaw Open NOTE This LED is common to both probe...

Страница 99: ...the probe do not light The oscilloscope channel may be bad Try another channel or another oscilloscope All LEDs should light briefly and then the Degauss AutoZero LED should flash If the probe functio...

Страница 100: ...Avoid 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 remai...

Страница 101: ...42 Current limitations amp second product 44 maximum continuous 43 maximum pulsed 43 D DC coupling 42 DC current loop 5 turn 63 DC gain accuracy adjustment 73 DC gain accuracy check 65 Degauss AutoZe...

Страница 102: ...ous current rating 43 pulsed current rating 43 Measuring current nulls 35 differential current 35 inductance 48 inductor turns count 51 Menu button TCP0020 16 Menu driven probe functions 17 N Null cur...

Страница 103: ...x Service options 31 returning the probe xviii Slider and conductor jaw 8 Specifications 53 nominal 60 typical 54 warranted 53 T Test record 71 Troubleshooting 74 20 A Current Probes Instruction Manua...

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