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Tektronix TCP0150, Instruction Manual

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Tektronix TCP0150 Instruction Manual Download Page 35

Application Examples

Inductance Measurements

You can use the current probe to measure the inductance of coils that have either a low-impedance or high-impedance pulse
source of a known value.

Low-Impedance Pulse Sources

This

fi

gure shows a constant-voltage pulse

generator of extremely 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.

Clamp the current probe over one of the
source leads.

NOTE.

If the probe impedance is a signi

fi

cant

part of the total circuit inductance, measurement
accuracy will be affected. Refer to the probe
speci

fi

cations for probe insertion impedance.

TCP0150 Current Probe Instruction Manual

19

Summary of Contents for TCP0150

Page 1: ...TCP0150 20 MHz 150 A AC DC Current Probe Instruction Manual www tektronix com 071 2251 00...

Page 2: ...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...

Page 3: ...duties 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 maintena...

Page 4: ......

Page 5: ...s Manual xi Returning the Probe for Servicing xii Key Features 1 Installation 2 Using the Probe Head 3 Degaussing the Probe 4 Connecting to the Circuit 6 Probe Controls and Indicators 8 Functional Che...

Page 6: ...rent Range 33 Increasing Sensitivity 36 Common Mode Noise Magnetic Field Errors 37 AC and DC Coupling 38 Maximum Current Limits 39 Specifications 43 Warranted Characteristics 44 Typical Characteristic...

Page 7: ...in Accuracy 61 Rise Time and Bandwidth 64 Test Record 66 Adjustments 67 Equipment Required 67 Equipment Setup 67 DC Gain Accuracy 68 Repair 70 Repairing the Probe 70 Probe Disassembly 71 Reassembly 79...

Page 8: ...Table of Contents iv TCP0150 Current Probe Instruction Manual...

Page 9: ...the probe input and the probe reference lead from the circuit under test before disconnecting the probe from the measurement instrument Ground the Product This product is indirectly grounded through...

Page 10: ...ive Atmosphere Keep Product Surfaces Clean and Dry Provide Proper Ventilation Refer to the manual s installation instructions for details on installing the product so it has proper ventilation Terms i...

Page 11: ...es an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to property includin...

Page 12: ...able 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 Serv...

Page 13: ...operly handled at the product s end of life In order 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...

Page 14: ...utside the scope of the 2002 95 EC RoHS Directive This product complies with the RoHS Directive requirements except for the presence of hexavalent chromium in the surface coating of the aluminum chass...

Page 15: ...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 16: ...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 17: ...7 5 ns rise time AC DC Measurement capability 500 A peak pulse current PW 30 s 25 A and 150 A range settings 5 mA sensitivity on TekVPI oscilloscopes that support the 1 mV div setting 1 DC Accuracy ty...

Page 18: ...t briefly for a quick visual check 2 To disconnect press the latch button and pull the probe away from the instrument NOTE Your TekVPI instrument may require a firmware upgrade to support full functio...

Page 19: ...power before you connect or disconnect the probe 2 The trigger at the rear of the probe opens and closes the sliding bar over the jaw and the conductor under test 3 Keep your hands behind the tactile...

Page 20: ...The DC gain and offset are not guaranteed when this LED flashes red 2 With no conductor in the jaw lock the probe slide 3 Press the Degauss AutoZero button on the probe or in the Degauss window on th...

Page 21: ...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 22: ...ot drop the probe or subject it to physical shock strain or sudden changes in ambient conditions 1 Press the lock switch down to unlock the slide 2 Squeeze the trigger handle to open the jaw 3 Place t...

Page 23: ...ide WARNING To prevent risk of electric shock use protective equipment gloves for example if you use the probe on accessible uninsulated wires or bus bar WARNING Do not exceed the bare wire voltage ra...

Page 24: ...of the indicator LEDs light briefly and then at least two LEDs remain lighted to indicate The current range selected The Degauss AutoZero status NOTE On some host instruments the probe retains the ra...

Page 25: ...nstallation Jaw Open LED 1 If the Jaw Open LED glows the probe slide is unlocked 2 Lock the probe slide to accurately measure current or to degauss the probe TCP0150 Current Probe Instruction Manual 9...

Page 26: ...robe has been exceeded Flashing red and orange Both the maximum continuous input current limit and the safe operating temperature of the probe have been exceeded NOTE The probe will shut down if you e...

Page 27: ...Press the Range button to select between the 25 A and 150 A current range settings The green LEDs indicate the selected range The range and units are also displayed on the oscilloscope screen TCP0150...

Page 28: ...e not guaranteed 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 curr...

Page 29: ...screen displays and shows your probe settings the screen differs by oscilloscope model See page 14 Optional Probe Screens Use the screen buttons to change the settings or to access other probe informa...

Page 30: ...model The Probe Controls screen may be accessed from the probe Menu button or other probe screens It contains buttons for common probe functions and for access to other probe screens such as Probe Set...

Page 31: ...Installation Click the Properties button to display the Probe Properties screen TCP0150 Current Probe Instruction Manual 15...

Page 32: ...ation procedures See page 57 1 Connect the probe to any channel 1 4 of the oscilloscope 2 Press the Degauss AutoZero button 3 When the Degauss AutoZero LED glows green connect the probe to your circui...

Page 33: ...correct polarity reading connect the probe so that the positive to negative current flow is aligned with the arrow on the probe jaw Close and lock the probe jaw over the conductor 3 Read the measurem...

Page 34: ...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 18 TCP0150 Current Probe Instruction...

Page 35: ...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 36: ...ined 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 37: ...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 whe...

Page 38: ...n 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 of coil current to input c...

Page 39: ...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 fewer or more turns than the refe...

Page 40: ...ts your needs Standard Accessories Protective Cover At your workbench put the probe in the padded protective cover to prevent accidental damage to the probe 1 Insert the probe into the protective cove...

Page 41: ...ction Manual The instruction manual provides operating and maintenance instructions Reorder Tektronix part number 071 2251 XX English 071 2252 XX Japanese 071 2253 XX Simplified Chinese TCP0150 Curren...

Page 42: ...or the performance verification procedures The BNC connector allows for easy connections to current sources WARNING To reduce the risk of shock do not use this accessory on voltages above 30 Vrms 42 V...

Page 43: ...g differences between current and voltage probes Refer to your oscilloscope manual or fixture documentation for instructions WARNING To reduce the risk of shock do not use this accessory on voltages a...

Page 44: ...box Refer to the compensation box replacement procedures for instructions for using the tool Reorder Tektronix part number 003 1892 00 Adjustment Tool Use this tool to access the adjustment controls...

Page 45: ...on 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 Service 3 years Option R5 Repair Service 5 years Manua...

Page 46: ...that the 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 e...

Page 47: ...e closed Damage to the probe may result If you cannot close the slide around the conductor s either reduce the number of conductors you are measuring or if possible take your measurement on a smaller...

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: ...rating of the connected probe you can extend the AC and DC current ranges without exceeding specified limits by using the following methods WARNING To avoid personal injury or equipment damage do not...

Page 50: ...component of known value in the 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...

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: ...al 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 pro...

Page 53: ...equencies 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 measure con...

Page 54: ...omponent 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 t...

Page 55: ...probe See Table 2 on page 45 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 du...

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 de...

Page 57: ...Ampere second or Ampere microsecond specification for the range setting of the TCP0150 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 TCP0150 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 TCP0150 probe has a...

Page 59: ...C The probe is connected to a host instrument with an input impedance of 1 M The probe must have a warm up period of at least 20 minutes and be in an environment that does not exceed the limits descri...

Page 60: ...ed requirements Warranted characteristics that have checks in the Performance Verification section are marked with the symbol Table 1 Warranted electrical characteristics Characteristic Description DC...

Page 61: ...25 A RMS 150 A Range 150 A RMS Control box derated to 100 A RMS above 40 C Maximum peak current See Figure 3 500 A maximum peak pulse Displayed RMS Noise 500 A RMS Limit measurement bandwidth to 20 M...

Page 62: ...Specifications Figure 1 Frequency derating peak current versus frequency 46 TCP0150 Current Probe Instruction Manual TCP0150...

Page 63: ...Specifications Figure 2 Typical differential input impedance versus frequency TCP0150 Current Probe Instruction Manual 47...

Page 64: ...Specifications Figure 3 Maximum peak pulse versus pulse width 48 TCP0150 Current Probe Instruction Manual...

Page 65: ...at 30 C to 75 C 86 F to 167 F Altitude Operating Up to 2000 meters 6 560 feet Nonoperating Up to 12 192 meters 40 000 feet Table 4 Typical mechanical characteristics Characteristic Description Dimens...

Page 66: ...Specifications Figure 4 Probe dimensions 50 TCP0150 Current Probe Instruction Manual...

Page 67: ...pped with the TekVPI interface Certifications and Compliances EC Declaration of Conformity Low Voltage Compliance was demonstrated to the following specification as listed in the Official Journal of t...

Page 68: ...Particular requirements for electrical equipment for measurement control and laboratory use Part 1 CAN CSA C22 2 No 1010 2 032 96 Particular Requirements for Hand Held Current Clamps for Electrical Me...

Page 69: ...d or located in clean rooms Polution Degree 2 Normally only dry nonconductive pollution occurs Occasionally a temporary conductivity that is caused by condensation must be expected This location is a...

Page 70: ...ory IV For measurements performed at the source of low voltage installation Measurement Category III For measurements performed in the building installation Measurement Category II For measurements pe...

Page 71: ...that enhance the performance and capabilities of your Tektronix instruments Troubleshooting The LEDs on the probe alert you to error or status conditions affecting the probe If you have the latest fi...

Page 72: ...be Do not use 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 rema...

Page 73: ...the operating instructions unless you are qualified to do so Refer to all safety summaries before performing any service The procedures that follow verify the warranted specifications of the probe lis...

Page 74: ...rator DCA 0 25 accuracy 0 to 10 A ACA 0 25 accuracy 0 to 7 5 A square wave output Fluke Wavetek 9100 w Options 100 and 250 or 600 Digital Multimeter DMM DCV 0 2 accuracy Keithley 2700 TekVPI Calibrati...

Page 75: ...oximately 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...

Page 76: ...oscilloscope 2 Connect the probe to any channel 1 4 of the oscilloscope 3 Press the Degauss AutoZero button 4 Power on the DMM current source and the pulse generator 5 Allow 20 minutes for the equipm...

Page 77: ...e DMM input 2 Connect the SMA M to BNC 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...

Page 78: ...proceeding The routine is complete when the indicator light turns green 8 Clamp the current probe around the 5 turn current loop as shown Maintain proper polarity the arrow shaped indicator on the pr...

Page 79: ...t current 10 0 A Expected output voltage Ve 1 0 V 15 Compute the Error using the measured amplitude values and the formula shown For example you might measure values of 2 475 V for M1 and 2 495 V for...

Page 80: ...cable 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 4 Set the oscilloscope as follow...

Page 81: ...e Test Record NOTE If you measure higher rise times than expected check your oscilloscope firmware version See page 55 Oscilloscope Firmware Early versions of oscilloscope firmware may engage the band...

Page 82: ...chnician Performance test Range Test Current Calibrator output Expected output Mini mum Incom ing Outgo ing Maxi mum 25 A 12 5 A 2 50 A 2 5 V 3 3 DC Gain Accuracy 150 A 50 0 A 10 0 A 1 0 V 3 3 Rise ti...

Page 83: ...erformance Verification procedure for the equipment required You also need an insulated adjustment tool See page 28 Adjustment Tool Equipment Setup Refer to the Performance Verification procedure for...

Page 84: ...lete steps 1 8 of the DC Gain Accuracy Test in the Performance Verification procedure See page 61 DC Gain Accuracy 2 Set the probe range to 25 A 3 Set the current source to 40 Hz square wave 1 0 Amp A...

Page 85: ...ge 6 Set the probe range to 150 A 7 Set the calibrator output to 7 5 A 8 Adjust the 150 A gain on the probe to display 750 mV 3 mV on the DMM 9 Disconnect the probe from the current source TCP0150 Cur...

Page 86: ...acement procedures are on the following pages Replaceable component Procedures to use Transformer Probe Head Disassembly Transformer Replacement Circuit Board Assembly Probe Head Disassembly Cable Cir...

Page 87: ...umber 003 1892 00 See page 28 Compensation Box Tool 1 Required for cable switch panel and compensation box replacement procedures Probe Disassembly The following procedures explain how to disassemble...

Page 88: ...e 2 Place the probe on a flat surface with the screw heads facing up 3 Using a 3 32 inch Allen wrench remove the eight retaining screws from the case 4 Separate the case halves and remove the slide 72...

Page 89: ...the squeeze handle is under tension and can pop out 1 Lift the cable out of the probe handle and insert a pair of pliers in the handle as shown 2 While maintaining a firm grip on the pliers carefully...

Page 90: ...Repair Transformer 1 To remove the current transformer lift the assembly out of the probe as shown 2 Disconnect the transformer from the circuit board 74 TCP0150 Current Probe Instruction Manual...

Page 91: ...cedure 2 To remove the circuit board cut the cable tie that secures the cable to the board 3 Disconnect the cable from the board When reassembling the probe do not tighten the new cable tie until you...

Page 92: ...e after replacing the cable perform steps 1 through 3 of this procedure in reverse See the following Caution statement CAUTION To avoid damaging the wires inside the probe carefully dress the wires in...

Page 93: ...sation box from the main section 2 Grasp the tool and front section together with one hand Hold the main section with the other hand and gently pull the two sections apart 3 Use the separator tool tab...

Page 94: ...e panel cable replace it and then reassemble the compensation box 7 If you are replacing the cable or compensation box disconnect the cable connector 8 Install the new cable or compensation box by per...

Page 95: ...sparingly to the parts 2 Reassemble the probe body by following steps 1 and 2 of the probe head disassembly procedure in reverse See page 71 Probe Disassembly CAUTION To avoid damaging the wires insid...

Page 96: ...or representative Changes to Tektronix instruments are sometimes made to accommodate improved components as they become available and to give you the benefit of the latest circuit improvements Therefo...

Page 97: ...umber when ordering replacement parts from Tektronix 3 and 4 Serial Number Column three indicates the serial number at which the part was first effective Column four indicates the serial number at whi...

Page 98: ...Repair Figure 5 Replaceable Parts 82 TCP0150 Current Probe Instruction Manual...

Page 99: ...CREW CAP 4 40 X 0 75 SCH STL CD PL HEX REC 7 348 0023 00 4 PLUG HOLE U W0 14 DIA HOLE WHT PLSTC 8 211 0183 00 2 SCREW CAP 4 40 X 0 5 SCH STL CD PL HEX REC 9 343 0149 00 1 STRAP TIEDOWN E 6 75L PLASTIC...

Page 100: ...Repair 84 TCP0150 Current Probe Instruction Manual...

Page 101: ...ussing 4 while connected to a conductor 30 Differential current 31 Documentation xi E Equipment required performance verification 58 Equipment setup 60 Extending the current range of the probe 33 F Fe...

Page 102: ...t 2 controls and indicators 8 coupling 38 disassembly 71 extending the current range 33 increasing the current limit 33 maximum current limits 39 reassembly 79 repairing 70 saturation 39 R Record test...

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