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Theory of Operation

32

P6249 4 GHz 5X Active Probe Instruction Manual

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Содержание P6249

Страница 1: ...Instruction Manual P6249 4 GHz 5X Active Probe 071 0538 05 www tektronix com...

Страница 2: ...cation supercedes that in all previously published material Specifications and price change privileges reserved Tektronix Inc P O Box 500 Beaverton OR 97077 TEKTRONIX and TEK are registered trademarks...

Страница 3: ...tions This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this...

Страница 4: ......

Страница 5: ...cessories Features and Standard Accessories 3 Optional Accessories 8 Configuration Probe Offset 9 Functional Check Deskew Fixture 13 Probe Calibration Errors 14 Check Compatibility 14 Check for Hardwa...

Страница 6: ...equired 33 Equipment Setup 34 Output Zero 35 DC Attenuation Accuracy 36 Rise Time 38 Adjustments Adjustment Locations 43 Offset Zero 44 Offset Range 45 Maintenance Replacing TEKPROBE Interface Pins 47...

Страница 7: ...diagram 29 Figure 10 TEKPROBE interface 31 Figure 11 Setup for output zero and DC attenuation accuracy 35 Figure 12 Test system rise time setup 38 Figure 13 Test system and probe rise time setup 39 F...

Страница 8: ...Table of Contents iv P6249 4 GHz 5X Active Probe Instruction Manual...

Страница 9: ...and the probe ground from the circuit under test before disconnecting the probe from the measure ment instrument Observe All Terminal Ratings To avoid fire or shock hazard observe all ratings and mark...

Страница 10: ...tatements identify conditions or practices that could result in damage to this product or other property Terms on the Product These terms may appear on the product DANGER indicates an injury hazard im...

Страница 11: ...uld perform service procedures Read this Service Safety Summary and the General Safety Summary before performing any service procedures Do Not Service Alone Do not perform internal service or adjustme...

Страница 12: ...w tektronix com Sales support 1 800 833 9200 select option 1 Service support 1 800 833 9200 select option 2 Technical support Email techsupport tektronix com 1 800 833 9200 select option 3 6 00 a m 5...

Страница 13: ...of circuit architectures The P6249 is powered through a TEKPROBE interface between the probe compensation box and the oscilloscope The P6249 can be used with non TEKPROBE oscilloscopes and instruments...

Страница 14: ...llowing accessories are available for the P6249 probe H SureFoot adapter probe tips H SMK4 Micro KlipChip adapters H Deskew fixture H Probe tip to SMA adapter H 1103 Probe Power Supply H Compensation...

Страница 15: ...ance Its small size makes it easy to handle in tight areas The probe tip socket is sized to easily press onto 0 025 inch pins for direct access The ground socket provides a short ground path for high...

Страница 16: ...probe tip To remove the tip gently grab the tip with small pliers and pull the tip out SureToe probe tip The SureToe tip is a pointed probe tip useful for probing in dense circuitry Attach the SureTo...

Страница 17: ...ground pogo pin to substantially reduce ground lead inductance Because the pogo pin simply touches the ground reference you can easily move the probe to different points on the circuit under test To...

Страница 18: ...way as the push in probe tip and can be easily removed by hand KlipChip Y lead adapter SMT KlipChip Use the SMT KlipChip test clips to access fragile dense circuitry KlipChip test clips can be connect...

Страница 19: ...lead adapter gently press the lead pins into the probe head tip and ground receptacles Using the black lead for ground is recommended Color marker bands Color marker bands Attach matching pairs of th...

Страница 20: ...ee probing of fine pitch SMD packages Attach SureFoot adapters the same way as the push in probe tips They can be used with any of the socketed accessory leads The orange 0 050 inch SureFoot tip is co...

Страница 21: ...the optional Tektronix 1103 Probe Power Supply If the P6249 is used with the Tektronix 1103 Probe Power Supply be sure to have a 50 termination at the oscilloscope Also set the oscilloscope channel co...

Страница 22: ...ge the volts division setting to the desired range adjusting the offset to keep the trace on the zero reference level NOTE The P6249 has a 5 0 V offset range The linear operating range is 2 0 V See Fi...

Страница 23: ...check may be performed using the PROBE COMPENSATION connections on the front panel of the oscilloscope Use the optional deskew fixture for optimum connections See Figure 2 Deskew fixture A B Figure 2...

Страница 24: ...lloscopes will return a Probe Cal Failed message If this occurs refer to Probe Calibration Errors on page 14 7 Disconnect the probe from the deskew fixture or SIGNAL terminal and ground the probe tip...

Страница 25: ...the calibration signal for deskewing The deskew fixture is configured to allow you to connect different probe models to the system Refer to Figure 3 to see how two P6249 probes are connected Ground Si...

Страница 26: ...scopes fully compatible with the P6249 probe Model number Firmware version required TDS 520D greater than FV 6 3e TDS 540D greater than FV 6 3e TDS 580D greater than FV 6 3e TDS 654C FV 5 1e or above...

Страница 27: ...ait for it to complete 2 Rerun the calibration routine on the P6249 probe 3 If the oscilloscope returns the failure message again initialize the probe calibration and check probe offset zero H If offs...

Страница 28: ...Functional Check 16 P6249 4 GHz 5X Active Probe Instruction Manual...

Страница 29: ...protected against static voltage however applying voltages above its design limits may damage the probe tip amplifier Please refer to Specifications on page 23 for the maximum operating voltage and f...

Страница 30: ...e C of your probe and ground lead path A portion of the ground lead path is uncontrollable since it is hard wired on the circuit board under test Calculate the approximate resonant frequency f0 at whi...

Страница 31: ...g a ground plane on top of a package being probed can minimize ground lead length and inductance See Figure 4 Figure 4 Low inductance grounding Attach a small piece of copper clad on top of the packag...

Страница 32: ...gth and distortion SureFoot Grounding If you cannot use the recommended low inductance grounding method you may ground the probe to the package under test using a SureFoot adapter Refer to Figure 5 Fi...

Страница 33: ...robe head onto the tip to make a measurement and then pull the probe head off when you are done The probe tip may be removed and reused by desoldering it from the circuit and soldering it into another...

Страница 34: ...Helpful Hints 22 P6249 4 GHz 5X Active Probe Instruction Manual...

Страница 35: ...esult Table 4 Warranted electrical specifications DC Attenuation Accuracy probe only 0 2 2 excludes offset error Output Zero 10 mV or less at output of probe Rise Time probe only 120 ps Table 5 Typica...

Страница 36: ...ed on screen with TEKPROBE interface DC Offset Scale Accuracy 2 of 5X actual probe gain Delay Time 5 05 ns 0 2 ns System Noise 300 V rms or less at output of probe with probe tip grounded 90 50 30 70...

Страница 37: ...le Length 1 3 meters 10 Frequency 10 MHz 1 MHz 100 MHz 10 GHz 12 14 16 18 20 22 24 26 28 1 GHz Gain 20 Log VOUT VIN Gain dB Figure 8 Typical bandwidth Table 7 Environmental characteristics Operating T...

Страница 38: ...Rev B Class 5 Altitude Operating 15 000 ft Non Operating 50 000 ft Pollution Degree Pollution Degree 2 Pollution Degree A measure of the contaminates that could occur in the environment around and wi...

Страница 39: ...re for use only by qualified personnel To avoid injury do not perform any servicing other than that stated in the operating instructions unless you are qualified to do so Refer to all Safety Summaries...

Страница 40: ......

Страница 41: ...in isolating failures to either the probe or the host oscilloscope Refer to Figure 9 for the simplified schematic Offset gain Offset zero Offset ampifier EEPROM Offset to probe Probe tip amplifier Sig...

Страница 42: ...lator Offset Amplifier The offset amplifier is used to offset the input signal DC component so that it stays at the optimal point of the probe linear dynamic range For more information on the linear d...

Страница 43: ...between the probe and the oscilloscope Contact pins provide power signal offset and data transfer for the probe identification EEPROM VCC 7 V Regulator The 15 V input is regulated to 7 V to supply the...

Страница 44: ...Theory of Operation 32 P6249 4 GHz 5X Active Probe Instruction Manual...

Страница 45: ...DC attenuation accuracy H Rise time Equipment Required Refer to Table 8 for a list of the equipment required to verify the performance of your probe Table 8 Equipment required for performance verifica...

Страница 46: ...Dual Banana 103 0090 00 Adapter Y lead adapter 196 3457 00 Adapters 2 Klip Chip adapter 206 0364 00 Equipment Setup Use this procedure to set up the equipment to test the probe 1 Connect the probe to...

Страница 47: ...ly 3 Ground the probe tip by connecting the probe tip to the probe ground socket Connecting two KlipChip adapters together is recommended 4 Set the 1103 offset VAR 0V to 0V 5 Observe the multimeter di...

Страница 48: ...dapters 6 Allow 30 minutes for the equipment to warm up Record the results of steps 7 through 10 separately Use the results to calculate the DC accuracy of the probe in step 11 7 Set the power supply...

Страница 49: ...1 Determine the percent error by using the formula below Error M1 M2 0 4 1 100 The calculated error should be 2 12 Record the results on the test record NOTE An unaccceptable error value may result if...

Страница 50: ...le to 50 mV div 4 Set the oscilloscope horizontal scale to 100 ps div 5 Adjust the oscilloscope horizontal and vertical position controls to display a signal similar to that shown in Figure 12 11801 1...

Страница 51: ...g ring to connect the probe to the 1103 power supply channel 1 input Disable the offset control on channel 1 of the 1103 power supply 9 Connect the probe tip adapter to the calibration step generator...

Страница 52: ...nts Measurement accuracy is degraded when the probe tip adapter is handled 12 Use the oscilloscope measurement capability to display rise time Rise time is determined from the 10 and 90 amplitude poin...

Страница 53: ...rial Number Certificate Number Temperature RH Date of Calibration Technician Performance test Minimum Incoming Outgoing Maximum Output zero voltage at probe output 10 mV 20_ C to 30_ C 10 mV ________...

Страница 54: ...Performance Verification 42 P6249 4 GHz 5X Active Probe Instruction Manual...

Страница 55: ...al check has been performed on the oscilloscope In order to make adjustments to the probe the compensation box top cover needs to be removed with the optional release tool Refer to page 48 Use the opt...

Страница 56: ...e calibration constants at this time If the offset zero is adjusted perform a functional check of the offset range before closing the compensation box 1 Ground the probe tip by connecting the probe ti...

Страница 57: ...offset range of the probe is approximately 3 5 to 3 5 volts 1 Power on the 1103 power supply and turn on the offset 2 Using a DMM adjust the 1103 offset voltage to 0 5 V Refer to Figure 15 for the loc...

Страница 58: ...6249 offset range setup 4 Set the DC power supply using the DMM to 2 5 VDC 5 Observe the DC value on the DMM 6 Adjust Offset Range for a DMM reading of 0 V 5 mV Refer to Figure 14 on page 43 for the l...

Страница 59: ...t of the interface If any pin fails to move freely and fully extend replace the pin To remove a TEKPROBE interface pin firmly grasp the pointed tip with pliers and pull the pin out of the connector Se...

Страница 60: ...lease tool pins into the compensation box cover catches and gently lift the cover off a small distance Refer to Figure 18 2 Hold the open edge apart and use the tool to open the other side of the comp...

Страница 61: ...eps 1 Align the tabs with the notches on the cover halves Refer to Figure 19 2 Press the cover tabs in so that the cover can be lowered 3 Slide the tabs into the notches 4 Firmly press the pieces toge...

Страница 62: ...interface collar off To replace the interface collar first note the pin configuration on the compensation box and their holes in the interface collar The group of three pins fit through the smaller of...

Страница 63: ...or a list of customer replaceable parts Due to the sophisticated design of the P6249 there are no user replaceable parts within the probe Preparation for Shipment If the original packaging is unfit fo...

Страница 64: ...Maintenance 52 P6249 4 GHz 5X Active Probe Instruction Manual...

Страница 65: ...leshoot the P6249 the probe must be attached to an operating TEKPROBE interface oscilloscope with the top cover of the compensation box removed Refer to page 48 for instructions on opening the compens...

Страница 66: ...ble 9 Troubleshooting guide Symptom Checks Result Action No Signal Out Check known signal Go to Probe Power No signal Probe power OK Continue checks Replace probe Distorted or nonlinear signal Is the...

Страница 67: ...ary between 1 V and 1 V Offset input OK Offset input bad Replace probe Check TEKPROBE interface pins on the compensation box See page 47 Check TEKPROBE interface on host instrument Try an adjacent cha...

Страница 68: ...Troubleshooting 56 P6249 4 GHz 5X Active Probe Instruction Manual...

Страница 69: ...ts are sometimes made to accommo date improved components as they become available and to give you the benefit of the latest circuit improvements Therefore when ordering parts it is important to inclu...

Страница 70: ...This parts list is indented to show the relationship between items The following example is of the indentation system used in the Description column 1 2 3 4 5 Name Description Assembly and or Compone...

Страница 71: ...erial no Effective Dscont Qty 12345 name description Mfr code Mfr part no 22 1 010 0622 00 1 PROBE FET ACT 4 GHZ 5X 1PF TDS SERIES 80009 010 0622 00 2 205 0191 XX 1 SHELL ELEC CONN BNC ABS DOVE GRAY 8...

Страница 72: ...Replaceable Parts P6249 4 GHz 5X Active Probe Instruction Manual 60 2 3 5 6 7 8 9 1 4 Figure 23 P6249 standard accessories...

Страница 73: ...16 1772 10 1 ACCESSORY KIT POGO PIN PKG OF 10 80009 016 1772 10 4 016 1773 10 1 ACCESSORY KIT GND PIN LENGTH ADAPTER PKG OF 10 80009 016 1773 10 5 016 1774 00 1 ACCESSORY KIT ADAPTER SPRING PKG OF 10...

Страница 74: ...Replaceable Parts P6249 4 GHz 5X Active Probe Instruction Manual 62 1 2 3 4 5 6 7 8 Figure 24 P6249 optional accessories...

Страница 75: ...SF501 1 ADPTR SUREFOOT 50 MIL JEDEC PKG OF 12 80009 SF501 4 SMK4 1 TIP PROBE MICROCKT TEST PKG OF 4 80009 SMK4 5 003 1433 02 1 ADJUSTMENT TOOL 80009 003 1433 02 6 003 1383 00 1 RLSE TOOL COVER COMP B...

Страница 76: ...249 4 GHz 5X Active Probe Instruction Manual 64 CROSS INDEX MFR CODE NUMBER TO MANUFACTURER Mfr Code Manufacturer Address City State Zip Code 80009 TEKTRONIX INC 14150 SW KARL BRAUN DR PO BOX 500 BEAV...

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