A6312 100 MHz AC/DC Current Probe Instructions
Contents
1. 32 Figure 14 Removing the probe slide eeeeeee 32 Figure 15 Removing the current transformer 33 Figure 16 A6312 exploded view ccc cece e cece ceees 37 ii A6312 Instructions Table of Contents List of Tables Table 1 Warranted A6312 specifications eee e eens 7 Table 2 Electrical characteristics 0c cece cece ween eee 7 Table 3 Mechanical characteristics c eee e eee evens 9 Table 4 Environmental characteristics eese 10 Table 5 Certifications and compliances eee 10 Table 6 Required test equipment cece cece newer eee 12 Table 7 Equipment settings for bandwidth 14 Table 8 Equipment settings for rise time esee 17 Table 9 Equipment settings for DC gain accuracy 20 Table 10 DC gain accuracy test for A6312 0 eee 21 Table 11 DC gain accuracy test work sheet for A6312 23 Table 12 Required test equipment eee 24 Table 13 AM503B AM 5030 settings for DC offset adjustment 25 Table 14 AM 503B AM 5030 error codes requiring DC offset adjustment eeeeeeeeeen nnn 26 Table 15 AM503A settings for DC offset adjustment 27 Table 16 AM503A error codes requiring DC offset adjustment 28 Table 17 AM 503 settings for DC offset adjustment 29 A6312 Instructi2. 12 To perform the acceptance tests in this section you will need the test equipment listed in Table 6 The test equipment must meet or exceed the specifications listed The test procedures may need to be modified if the recommended equipment is not used Table 6 Required test equipment Recommended Description Equipment Qty 1 Oscilloscope 500 MHz bandwidth TDS520B 1 Current probe AM503 series Select the amplifier amplifier as noted on page 13 1 Leveled sine wave 3 MHz to 100 MHz 4 flatness Wavetek 9100 with generator Option 250 or SG503 equivalent 1 Calibration generator 1 MHz square wave rise time lt 1 ns Wavetek 9100 with 1 Vp p into 50 Q Option 250 or PG506A equivalent 1 Digital multimeter 0 25 31 digit resolution at 50 mV DM2510 G or Fluke 850x 884x 1 Current source 0 3 accuracy 0 to 2 A Fluke 5700A or Wavetek 9100 with Option 250 1 Calibration fixture 50 BNC Connector 015 0601 50 1 Current loop 20 turns 27 AWG coated wire Refer to page 19 1 Termination 50 0 1 0 5 W 011 0129 00 1 BNC BNC cabe 50 Q 1 05 m S00 1 05m 42in iong in long 012 0057 01 1 exe ee to Dual 103 0090 00 Banana Adapter A6312 Instructions Performance Verification A6312 Instructions Performance and interchangeability of the A6312 probe depends upon the type of amplifier you select to verify the probe When selecting one of the AM503 series amplifiers please note the following m If you
3. Lock the probe slide closed see Figure 2 4 Press the amplifier PROBE DEGAUSS AUTOBALANCE button Getting Started NOTE The degauss procedure will fail if the amplifier is not properly connected to a 50 Q termination impedance After you have completed the oscilloscope adjustments and the degauss autoba lance procedure your system is ready to measure current Maximum Current Limits Procedure A Current probes have three maximum current ratings continuous pulsed and Ampere second product Exceeding any of these ratings can saturate the probe core and cause measurement errors The section titled Specifications on page 7 lists the maximum current ratings of the probe Maximum Continuous Current refers to the maximum current that can be continuously measured at DC or at a specified AC frequency The maximum continuous current value is derated with frequency as the frequency increases the maximum continuous current rating decreases m Maximum Pulsed Current refers to the maximum peak value of pulsed current the probe can accurately measure regardless of how short within bandwidth limitations the pulse duration Wm Ampere Second Product defines the maximum width of pulsed current that you can measure when the pulse amplitude is between the maximum continuous and maximum pulsed current specifications The maximum continuous specification itself varies by frequency NOTE Always degauss the probe after measurin
4. 1 2 3 4 or 5 years Country Instrument model and serial number Phone Instrument purchase date ENSE AEN Table of Contents A6312 Instructions General Safety Summary cc cece cece cece ence ences v Preface ee hase ek ap n a uds EET TAa E ea i vii Contacting Tektronix leeseeeeee eee eee tenn r Vili Getting Started ses 5 acess 6 eh nereda toi ker 4m Ene mh Wave ene Bia 1 Probe Installation toy ees m n ee aee o he ea AS t s 1 Operating the Current Probe Slide 00 0 cece eee eee eee ee eee 2 Degaussing and Autobalancing the Current Probe 04 3 Maximum Current Limits saou eee cece eee eens 4 Specifications iav yea eae e a Tec eee T VI en 7 Performance Verification ccc cece eee cere enne 11 Test Procedure Conditions 0 0 0c cece eee en eens 11 Equipment Preparation essel 11 Required Test Equipment 0 0 cece eee e 12 Bandwidthins 1 eR na eR Re OS haa ag RD RICH 14 Rise Diei woes nz tec ui b eee os Ced s ic be ug SA QU RC 16 DC Gain Accuracy cune E eet as wad LC RAD ce CR RR 19 Probe Trim Adjust for Gain Accuracy AM503B and AM5030 Only 22 DC Offset Adjustment leeren nnne 24 Required Test Equipment 00 eee eee eee eee eens 24 Equipment Connections 0 cece eee eee een e een eens 25 AMS03B or AM5030 1 0 eee ete n 25 AMIGA 154 teh psp vlt s gh o tat ate ash are let D uer Aa 27 AMIO t not eR Ot
5. 5 1 2 5 10 20 50 100 Frequency MHz Figure 6 A6312 insertion impedance curve Table 3 Mechanical characteristics Probe dimensions Length 20 cm 7 77 inches Width 1 6 cm 0 625 inches Height 3 2 cm 1 25 inches Cable length 2 m 6 6 feet Weight 255 g 0 56 Ibs Maximum Wire Size 3 8 mm 0 15 in 11 0 470i 18 9 mm 0 745 in E y l Figure 7 A6312 Probe jaw dimensions nominal A6312 Instructions 9 Specifications Table 4 Environmental characteristics Operating temperature Storage temperature Humidity Nonoperating Operating Transportation Mechanical shock Vibration Random vibration Operating 0 C to 50 C 40 C to 75 C 30 C to 60 C at 90 to 95 RH 30 C to 50 C at 90 to 95 RH Qualifies under National Safe Transit Procedure 1A category Il 36 in drop 500 g Half sine Three shocks on three axes of the probe for 1 ms duration Total of 9 shocks 0 025 in pk pk displacement 10 50 Hz in 1min cycles Hold 9 min at any major resonance or if none at 55 Hz Total time 54 min 0 31 grms 5 to 500 Hz 10 minutes on each axis Tektronix Std 062 2858 00 Rev B Class 3 Table 5 lists the product certifications and compliances Table 5 Certifications and compliances EC Declaration of Conformity Certifications Overvoltage category Pollution degree 2 10 Meets intent of Low Voltage Directive 73 23 EEC for Product Safety
6. A6312 DP Mfr Code 80009 91260 80009 TK2565 80009 3M099 80009 80009 80009 TK1947 80009 05469 80009 80009 Mfr Part Number 204 0288 03 ORDER BY DESCRIPTION 214 0849 00 352 0106 00 650 3496 00 ORDER BY DESCRIPTION 334 8976 00 204 0714 06 120 1988 00 214 0854 00 351 0121 01 ORDER BY DESCRIPTION 020 0167 01 070 9603 XX A6312 Instructions Replaceable Parts Manufacturers cross index Mfr Code 05469 3M099 80009 91260 TK1947 TK2565 Manufacturer BEARINGS INC PORTLAND SCREW COMPANY TEKTRONIX INC CONNOR FORMED METAL PRODUCTS NORTHWEST ETCH TECHNOLOGY VISION PLASTICS INC A6312 Instructions Address 3634 EUCLID PO BOX 6925 6520 N BASIN AVE 14150 SW KARL BRAUN DR PO BOX 500 1729 JUNCTION AVENUE 2601 S HOOD ST PO BOX 110610 26000 SW PARKWAY CENTER DRIVE City State Zip Code CLEVELAND OH 44101 PORTLAND OR 97217 BEAVERTON OR 97077 0001 SAN JOSE CA 95112 TACOMA WA 98411 0610 WILSONVILLE OR 97070 39 Replaceable Parts 40 A6312 Instructions
7. Compliance was demonstrated to the following specification as listed in the Official Journal of the European Communities Low Voltage Directive 73 23 EEC as amended by 93 68 EEC EN 61010 1 Safety requirements for electrical equipment for measurement control and laboratory use EN 61010 2 032 1994 Particular requirements for hand held current clamps for electrical measurement and test Underwriters Laboratories certified to Standard UL3111 1 and CSA CAN C22 2 No 1010 1 for Electrical and Electronic Measuring and Testing Equipment Underwriters Laboratories certified to Standard IEC1010 2 032 Particular requirements for hand held current clamps for electrical measurement and test Category Examples of Products in this Category CAT Ill Distribution level mains fixed installation CAT Il Local level mains appliances portable equipment CAT Signal levels in special equipment or parts of equipment telecommunications electronics Do not operate in environments where conductive pollutants may be present A6312 Instructions _ I 2a Performance Verification The Performance Verification tests allow you to demonstrate that the A6312 current probe meets its specified levels of performance Tolerances that are specified in these procedures apply to the AM503 series current probe amplifiers and the A6312 current probe and do not include test equipment error The recommended calibration interval is one year Test Procedure Cond
8. Table 2 Electrical characteristics Frequency derating 2 A at 20 MHz Maximum bare wire working voltage 300 Vnus Maximum continuous current 20 A DC peak AC Maximum pulsed current 50A Amp second product 1 x 104A s 100 A us Insertion impedance 0 1 2 at 1 MHz 0 5 Q at 50 MHz 1 Q at 100 MHz A6312 Instructions 7 Specifications Maximum peak pulse 50 A Amp second product limit 100 A us Maximum continuous input lt 20 A Amperes peak 1 2 3 4 5 Allowable pulse width microseconds Figure 4 A6312 specified operating area 200 100 50 10 Maximum input current amperes peak 1 kHz 10 kHz 100 kHz 1MHz 10 MHz 100 MHz Frequency Figure 5 A6312 frequency derating curve for maximum input current 8 A6312 Instructions Specifications 1 0 7a 7 0 5 Typical impedance Pdl i mpedance deviation b 4 a m g L Paj 0 2 ye Pd T st Z rT a Pd 2 o 01 Pall s 4 st Be 4 o ere EB 05 7 7 S 4 4 7 7 2 7 d 02 01 0 1 0 2 0
9. coarse offset adjustment Unable to complete negative coarse offset adjustment Unable to complete positive fine offset adjustment Unable to complete negative fine offset adjustment Press and hold the 20 MHz BW LIMIT button and while holding it press the PROBE DEGAUSS AUTOBALANCE button This sets the front panel display to 00 and puts the AM503A into an internal test mode Rotate the CURRENT DIVISION knob until the front panel display reads 21 Press and release the 20 MHz BW LIMIT button This sets the AM503A internal offsets to zero Adjust the A6312 DC Offset control so that the oscilloscope trace is on the center graticule line zero offset 2 divisions Press and release the 20MHz BW LIMIT button then press and release the DC COUPLING button This exits the AM503A test mode A6312 Instructions DC Offset Adjustment AM503 Equipment Settings Procedure A6312 Instructions Use the following procedure to adjust the DC offset of the A6312 current probe when using an AM503 current probe amplifier Make or verify the equipment settings in Table 17 Table 17 AM 503 settings for DC offset adjustment AM503 Coupling CAL DC LEVEL BW limit On 5 MHz bandwidth limit Current division 10 mA division Oscilloscope Vertical gain 10 mV division Time base Auto triggered 1 ms division Input coupling Ground 1 Move the oscilloscope trace to the center horizontal graticule line using the vertical p
10. may be performed Probe trim adjust is a multiplicative factor that you can use to adjust the gain of the current amplifier system You can set this multiplier in increments of 0 001 from 0 750 through 1 250 Probe trim adjust is used for an optional calibration of some current probes If you are not performing such an adjustment leave probe trim adjust to the factory default of unity gain 1 000 To set probe trim adjust press and hold the 20MHz BW LIMIT button while pressing and releasing the COUPLING button Use the and amp buttons to adjust the setting that is displayed in the CURRENT DIVISION display When finished press either the 20MHz BW LIMIT or COUPLING button to restore normal operation The display shows the last three significant digits of the display adjust setting the leading 0 or 1 are omitted If the first digit displayed is 7 8 or 9 then the leading digit must be 0 If the first digit displayed is 0 1 or 2 then the leading digit must be 1 A6312 Instructions Performance Verification Table 11 DC gain accuracy test work sheet for A6312 Turns of current Current probe a ae loop passing amplifier Current source d current through probe current division output Error 20 Um aaa ome 20 am laom mm 20 sm lasm m 20 oma lsm mm T mm sm mm 20 om lasm foma J hom jum ita T mom 95m A 20 wma asma isa S S
11. on page 23 to record the results of your measurements Set the current source for the correct negative test current using Table 10 Table 10 DC gain accuracy test for A6312 Turns of current Current probe loop passing amplifier Current source Test current through probe current division output h 20 10 mA 20 20 mA 20 50 mA 20 100 mA f Record the digital multimeter reading as M2 g Calculate the measured current Im using the following formula A6312 Instructions _ M M In 0 01 X current division 21 Performance Verification For example you might have obtained values of 50 mV for M and 48 mV for M If you are using an amplifier setting of 10 mA division you can compute J as 7 80 0107 48x10 Wr 0 01 X 10x10 98 mA h Verify that the measured current In is within 3 of the test current I by computing Error as follows I I Error x 100 t For example using a test current J of 100 mA and a measured current J of 98 mA the Error would be 98 100 Error 100 x 100 2 Probe Trim Adjust for Gain Accuracy AM503B and AM5030 Only 22 After the PROBE DEGAUSS AUTOBALANCE routine has been run the probe and amplifier system will meet all published specifications however if you want to improve the tolerance of the system gain accuracy or to intentionally offset the gain accuracy to make up for total system errors the probe trim adjust routine
12. with the next higher indentation Attaching parts must be purchased separately unless otherwise specified Abbreviations Abbreviations conform to American National Standards Institute ANSI standard Y1 1 36 A6312 Instructions Replaceable Parts CN Uc ee KSA OSA cam y KS aS SS Ss Ca 95 Figure 16 A6312 exploded view 37 A6312 Instructions Replaceable Parts Replaceable parts list Fig amp Index Tektronix Serial No Serial No Number PartNumber Effective Discont d 16 0 1 204 0288 03 2 214 0835 00 3 214 0849 00 4 352 0106 00 5 650 3496 00 6 213 0087 00 7 334 8976 00 8 204 0714 06 9 120 1988 00 10 214 0854 00 11 351 0121 01 12 214 0997 00 020 0167 01 070 9603 XX 38 Qty Name amp Description 1 1 PROBE CURRENT A6312 BODY HALF PROBE UPPER BODY HALF BLACK POLY A6302 SPRING HLCPS 0 127 OD X 2 65 L SST RTNR RETURN SPR BRS CD PL P6042 HOLDER SPR RTNR DELRIN P6042 CABLE W BD ASSY CABLE W A6312 PROBE CIRCUIT BOARD A6312 SCREW TPG TC 2 32 X 0 5 TYPE BT PANHEAD STEEL CADIUM PLATED POZIDRIVE MARKER IDENT PROBE IDENT LABEL A6312 BODY HALF LOWER BODY HALF W CONTACTS A6302 XFMR SUBASSY UPPER amp LOWER TRANSFORMER SUBASSY A6312 CONTACT ELEC UPPER SHELF CU BE CONT ASSY ELEC PROBE SLIDE ASSY A6302 BALL BEARING 0 094 SST Standard Accessories ACCESSORY PKG ACCESSORY PACKAGE P6021 MANUAL TECH INSTRUCTIONS
13. Instructions Tektronix A6312 100 MHz AC DC Current Probe 070 9603 02 Warning The servicing instructions are for use by qualified personnel only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to all safety summaries prior to performing service www tektronix com Copyright Tektronix Inc All rights reserved Tektronix products are covered by U S and foreign patents issued and pending Information in this publication 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 of Tektronix Inc WARRANTY Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of one 1 year from the date of shipment If a product proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix with shipp
14. L OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES Service Assurance If you have not already purchased Service Assurance for this product you may do so at any time during the product s warranty period Service Assurance provides Repair Protection and Calibration Services to meet your needs Repair Protection extends priority repair services beyond the product s warranty period you may purchase up to three years of Repair Protection Calibration Services provide annual calibration of your product standards compliance and required audit documentation recall assurance and reminder notification of scheduled calibration Coverage begins upon registration you may purchase up to five years of Calibration Services Service Assurance Advantages m Priced well below the cost of a single repair or calibration W Avoid delays for service by eliminating the need for separate purchase authorizations from your company m Eliminates unexpected service expenses For Information and Ordering For more information or to order Service Assurance contact your Tektronix representative and provide the information below Service Assurance may not be available in locations outside the United States of America Name VISA or Master Card number and expiration Company date or purchase order number Address Repair Protection 1 2 or 3 years City State Postal code Calibration Services
15. SC aa umm m SC 20 ma sem oa SC 20 hA faan oa 1 1 oo 1 Mi M ee In 0 01 X current division I E I Error X 100 L A6312 Instructions 23 DENEN OSEE DC Offset Adjustment The following adjustment procedures describe how to adjust the DC offset of the A6312 using the AM503 AM503A AM503B or AM5030 amplifiers Toler ances that are specified in these procedures apply to the current probes and do not include test equipment error Refer to Figure 11 for the location of the DC offset adjustment DC offset Hop OO Figure 11 A6312 DC offset adjustment location Required Test Equipment To perform the adjustment procedures in this section you will need the test equipment listed in Table 12 The test equipment must meet or exceed the specifications listed The test procedure may need to be changed if the recom mended equipment is not used Table 12 Required test equipment Recommended Description equipment Oscilloscope 150 MHz bandwidth TDS460 Termination 50 Q BNC connector 011 0049 01 feedthrough BNCcabe BNCcabe 50 Q 1 05 m 42 in long 012 0057 01 Provided as a standard accessory with the AM503 series amplifiers 24 A6312 Instructions DC Offset Adjustment Equipment Connections AM503B or AM5030 Equipment Settings Procedure A6312 Instructions 1 Connect the amplifier output to a 50 Q osci
16. auss autobalance routine completes Verify that the oscilloscope input is 50 and set to DC coupling If necessary use a 50 Q termination at the oscilloscope input 5 If no error codes are displayed after the degauss autobalance routine completes no offset adjustment is necessary If any of the error codes listed in Table 14 are displayed continue with the procedure Table 14 AM 503B AM 5030 error codes requiring DC offset adjustment Error code Meaning 580 Unable to complete negative offset adjustment 581 Unable to complete positive offset adjustment 6 Press and hold the 20 MHz BW LIMIT button and while holding it press the PROBE DEGAUSS AUTOBALANCE button This sets the front panel display to 00 and puts the AM503B and AM5030 into an internal test mode 7 Press the CURRENT DIVISION button until the front panel display reads 52 8 Press and release the 20 MHz BW LIMIT button The amplifier degausses itself Wait until the DEGAUSS light goes out 9 Adjust the DC Offset control so that the oscilloscope trace is on the center graticule line zero offset 2 divisions 10 Press and release the 20 MHz BW LIMIT button then press and release the COUPLING button This exits the AM503B and AM5030 test mode A6312 Instructions DC Offset Adjustment AM503A Equipment Settings Procedure A6312 Instructions Use the following procedure to adjust the DC offset of the A6312 current probe when using an AM503A
17. cation number if applicable If a part you order has been replaced with a different or improved part your local Tektronix service center or representative will contact you concerning any change in the part number Using the Replaceable Parts List Item Names A6312 Instructions The tabular information in the Replaceable Parts List is arranged for quick retrieval Understanding the structure and features of the list will help you find all the information you need for ordering replacement parts In the Replaceable Parts List an Item Name is separated from the description by a colon Because of space limitations an Item Name may sometimes appear as incomplete For further Item Name identification U S Federal Cataloging Handbook H6 1 can be used where possible 35 Replaceable Parts Indentation System 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 amp Description Assembly and or Component Attaching parts for Assembly and or Component END ATTACHING PARTS Detail Part of Assembly and or Component Attaching parts for Detail Part END ATTACHING PARTS Parts of Detail Part Attaching parts for Parts of Detail Part END ATTACHING PARTS Attaching parts always appear at the same indentation as the item it mounts while the detail parts are indented to the right Indented items are part of and included
18. current probe amplifier Make or verify the equipment settings in Table 15 Table 15 AM503A settings for DC offset adjustment AM503A Coupling DC BW limit On 20 MHz bandwidth limit Current division 10 mA division Oscilloscope Vertical gain 10 mV division Time base Auto triggered 1 ms division Input coupling Ground 1 Move the oscilloscope trace to the center horizontal graticule line using the vertical position control 2 Setthe oscilloscope input coupling to DC 3 Do not clamp the current probe around a conductor but make sure the jaws are locked shut 4 Press the AM503A PROBE DEGAUSS AUTOBALANCE button Wait for the degauss autobalance routine to complete before proceeding The routine is complete when the indicator light turns off NOTE If the AM503A is not properly terminated into 50 Q the AM503A front panel displays error code 54 after the degauss autobalance routine completes Verify that the oscilloscope input is 50 Q and set to DC coupling If necessary use a 50 Q termination at the oscilloscope input 5 If no error codes are displayed after the degauss autobalance routine completes no offset adjustment is necessary If any of the error codes in Table 16 are displayed continue with the rest of this procedure 27 DC Offset Adjustment 28 Table 16 AM503A error codes requiring DC offset adjustment Error code Meaning 46 47 48 49 10 Unable to complete positive
19. ded solvent Do not use chemicals containing benzine benzene toluene xylene acetone or similar solvents Do not use a petroleum based lubricant on the plastic If the plastic slide assembly requires lubrication use a silicone based grease sparingly Do not immerse the probe in liquids or use abrasive cleaners Disassembly Instructions 30 A WARNING Probe disassembly should only be performed by qualified service personnel 1 Remove the two screws from the bottom of the probe and pull the strain relief boot back as shown in Figure 12 A6312 Instructions Maintenance A6312 Instructions Strain relief boot Screws Figure 12 Removing the strain relief boot 2 Move the probe slide assembly to the open position NOTE The probe slide contains a tiny metal ball In step 3 be careful not to lose the ball by accidentally letting it fall out 3 Hold the probe in a top up horizontal position and slide the top half of the probe body off as shown in Figure 13 4 Remove the metal ball 5 Turn the probe upside down push the slide back slightly and remove the slide see Figure 14 31 Maintenance 32 Be careful to keep this tiny metal ball from falling out S xs 1 Hold the bottom 2 Grasp the top half of half ofthe probe the probe body here body in one hand with your other hand then a pivot the back end up and b slide the top forward off
20. e de UP ptt uidi der odere auf ets E oS 29 Maintenance 5 235 erbe er rales P ehe TOC Preis od deoa 30 enm E 30 Disassembly Instructions 0 cece eee ee 30 Obtaining Replacement Parts 0 eee eee eee e 34 Preparation for Shipment 0 eee cece eee ee eens 34 Replaceable Parts 0 cece cece cece cece cece e ehh hte 35 Parts Ordering Information 0 0 eee cee eee ee eee eee 35 Using the Replaceable Parts List 0 0 eee cee cee een 35 l Table of Contents List of Figures Figure 1 Connecting a current probe to the current probe amplifier soseen ere ccc ccc ce ccc ce ree eee e hens 2 Figure 2 Operating the probe slide 0 cece cee ceees 3 Figure 3 Applying the amp second product rule 5 Figure 4 A6312 specified operating area ee eeeee 8 Figure 5 A6312 frequency derating curve for maximum input curret seess estere ke ke RR e e ee EO eS 8 Figure 6 A6312 insertion impedance curve eese 9 Figure 7 A6312 Probe jaw dimensions nominal 9 Figure 8 Bandwidth test setup for the A6312 current probe 14 Figure 9 Rise time test setup for A6312 eee 17 Figure 10 DC gain accuracy test setup for A6312 20 Figure 11 A6312 DC offset adjustment location 24 Figure 12 Removing the strain relief boot 31 Figure 13 Removing the top half of the probe
21. efore clamping the current probe around it Also never disconnect the probe from the amplifier when the probe is connected to a live conductor WARNING When the probe slides are open the exposed ferrite core pieces are 2 A6312 Instructions Getting Started Figure 2 illustrates the slide operation of the probe To open the probe pull the slide back until the jaw is open To lock the probe push the slide forward until the detent snaps into place Probe open Probe locked S o oe N Figure 2 Operating the probe slide Degaussing and Autobalancing the Current Probe A6312 Instructions Degaussing the probe removes any residual magnetization from the probe core Such residual magnetization can induce measurement error Autobalancing removes unwanted DC offsets in the amplifier circuitry Failure to degauss the probe is a leading cause of measurement errors To maintain measurement accuracy degauss your probe in each of these cases m After turning on the amplifier and allowing a 20 minute warm up period m Before connecting the probe to a conductor or changing conductors under test m Whenever an overload condition occurs m Whenever the probe is subjected to a strong external magnetic field m Periodically during normal use Degauss and autobalance the current probe as follows 1 Verify that the current probe is connected to the amplifier 2 Remove the current probe from the conductor under test 3
22. ers in the following manuals AM503 Instruction Manual 070 2052 XX AM503S AM503A User Manual 070 8170 XX AM503S AM503A Service Manual 070 8174 XX AM503B amp AM5030 Instruction Manual 070 8766 XX vii Preface Contacting Tektronix viii Phone 1 800 833 9200 Address Tektronix Inc Department or name if known 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA Web site www 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 00 p m Pacific time This phone number is toll free in North America After office hours please leave a voice mail message Outside North America contact a Tektronix sales office or distributor see the Tektronix web site for a list of offices A6312 Instructions Getting Started Probe Installation A6312 Instructions A The A6312 is a DC to 100 MHz current probe designed for use with the AM503 series current probe amplifiers With the AM503A amplifier you can measure frequencies up to 80 MHz With the AM503 AM503B and AM5030 amplifiers you can measure frequencies up to 100 MHz The A6312 current probe can measure currents to 20 A DC peak AC and up to 50 A peak current while not exceeding the amp second rating This section explains how to install and operate the A6312 current probe To c
23. g a current that exceeds the maximum continuous current maximum pulsed current or Ampere second product rating of the probe Exceeding these ratings can magnetize the probe and cause measurement errors To determine if your measurement exceeds the Ampere second product perform either Procedure A or Procedure B To determine the maximum allowable pulse width measure the peak current of the pulse see Figure 3a Divide the Ampere second or Ampere microsecond specification of your probe by the measured peak current of the pulse The quotient is the maximum allowable pulse width the pulse width at the 50 point of the measured signal must be less than this value For example the A6312 current probe has a maximum Ampere second product of 100 A us If a pulse measured with an A6312 has a peak current of 40 A the maximum allowable pulse width would be 100 A us divided by 40 A or 2 5 us A6312 Instructions Getting Started Maximum jute Do not exceed pulsed current Pulse width at 50 Pulse width a at 50 50 Maximum P continuous current 0A a Maximum allowable pulse width b Maximum allowable pulse amplitude Figure 3 Applying the amp second product rule A6312 Instructions Getting Started Procedure B To determine the maximum allowable pulse amplitude measure the pulse width at the 50 points see Figure 3b Divide the Ampere second or Ampere microsecond specification
24. ing charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located Customer shall be responsible for paying all shipping charges 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 maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper use or connection to incompatible equipment c to repair any damage or malfunction caused by the use of non Tektronix supplies or d to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES EXPRESS OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTA
25. ition mode Average Number of waveforms to average 32 Measurement type Rise time Calibration generator Period 1 us Output Fast rise Amplitude Maximum Current probe amplifier Coupling DC BW Limit Off full bandwidth Current division 5 mA division 1 Do not clamp the current probe around any conductor but make sure the jaws are locked shut 2 Press the amplifier PROBE DEGAUSS AUTOBALANCE button Wait for the degauss autobalance routine to complete before proceeding The routine is complete when the indicator light turns off 3 Clamp the current probe around the calibration fixture Verify that the arrow shaped indicator on the probe points away from the pulse source 4 Using the measurement capability of the oscilloscope measure the rise time of the displayed pulse from 10 to 90 amplitude 5 Calculate the rise time of the probe t probe using the formula below t probe t measured t system The measured rise time t measured is the value calculated in step 4 The system rise time f system is the rise time of the displayed signal when output of the pulse generator is connected directly to the oscilloscope input The current probe and amplifier are excluded A6312 Instructions Performance Verification 6 Verify that the probe rise time is less than the warranted specification Refer to Table 1 on page 7 NOTE When using the A6312 on an AM503 you can optimize the pulse response by adju
26. itions These procedures are valid only under the following conditions m The system has been calibrated at an ambient temperature of 23 5 C m The system is operating in an environment whose limits are described in Table 4 on page 10 m The system including probe has had a warm up period of at least 20 minutes m The probe degauss autobalance routine has been performed after the 20 minute warm up period Before starting these procedures read completely through each procedure to ensure proper completion Equipment Preparation Before performing the verification tests install all plug in units into the power module and turn the power on Turn any remaining equipment on and allow the entire system including the attached probe to warm up for a minimum of 20 minutes A6312 Instructions 11 Performance Verification NOTE Before performing any verification procedure properly degauss the probe Remove the probe from any current carrying conductor lock the probe and press the amplifier PROBE DEGAUSS AUTOBALANCE button The degauss autobalance routine is complete when the indicator light turns off The amplifier front panel displays an error code 266 during the degauss autobalance routine if the amplifier is not properly terminated into 50 Q Verify that the oscilloscope input is 50 Q and set to DC coupling Use a 50 Q feedthrough termination attached at the oscilloscope input if necessary Required Test Equipment
27. lloscope input using a 50 Q BNC cable If the input impedance of your oscilloscope is 1 MQ first connect a 50 Q feedthrough termination to the oscilloscope input Do not connect the termination at the amplifier output 2 Connect the current probe to the amplifier input connector 3 Do not clamp the current probe around a conductor but make sure the jaws are locked shut Use the following procedure to adjust the DC offset of the A6312 current probe when using an AM503B or AM5030 current probe amplifier Make or verify the equipment settings in Table 13 Table 13 AM503B AM 5030 settings for DC offset adjustment AM503B and AM5030 Coupling DC BW Limit On 20 MHz bandwidth limit Current division 10 mA division Oscilloscope Vertical Gain 10 mV division Time Base Auto triggered 1 ms division Input Coupling Ground 1 Move the oscilloscope trace to the center horizontal graticule line using the vertical position control 2 Set the oscilloscope input coupling to DC 3 Do not clamp the current probe around a conductor but make sure the jaws are locked shut 4 Press the amplifier PROBE DEGAUSS AUTOBALANCE button Wait for the degauss autobalance routine to complete before proceeding The routine is complete when the indicator light turns off 25 DC Offset Adjustment 26 NOTE If the amplifier is not properly terminated into 50 Q the amplifier front panel displays error code 266 after the deg
28. ns General Safety Summary Symbols and Terms A A Certifications and Compliances vi Terms in this Manual These terms may appear in this manual WARNING Warning statements identify conditions or practices that could result in injury or loss of life CAUTION Caution statements 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 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 including the product Symbols on the Product The following symbols may appear on the product A A a CAUTION WARNING Double Protective Ground Do not connect to or Refer to Manual High Voltage Insulated Earth Terminal remove from an uninsulated conductor that c is HAZARDOUS LIVE Breakable Do not drop Use only on an insulated wire Refer to the specifications section for a listing of certifications and compliances that apply to this product A6312 Instructions Preface A6312 Instructions This instruction manual supports the operation and maintenance of the A6312 Current Probe with any of the AM503 series current probe amplifiers You can find additional documentation supporting the operation and maintenance of the AM 503 series amplifi
29. of your probe by the pulse width The quotient is the maximum allowable current the peak amplitude of the measured pulse must be less than this value For example the A6312 current probe has a maximum Ampere second product of 100 A us If a pulse measured with an A6312 probe has a width of 3 us the maximum allowable peak current would be 100 A us divided by 3 us or 33 3 A 6 A6312 Instructions REE aE Specifications This section lists the specifications characteristics certifications and com pliances for the A6312 current probe Warranted specifications Table 1 are guaranteed performance specifications unless specifically designated as typical or nominal Table 1 Warranted A6312 specifications Installed amplifier Bandwidth DC to 100 MHz 3 dB Rise time 10 to 90 zx 3 5 ns DC gain accuracy lt 3 lt 1 5 typical System noise typical 250 uAnys 1 You can optimize the pulse response by adjusting R364 HF COMP located inside the AM503 amplifier Refer to the AM503 Instruction Manual 070 2052 XX for instructions on how to access this adjustment On the AM503B and AM5030 the DC gain accuracy is correctable to lt 0 2 when using the AM503B and AM5030 probe trim procedure described on page 22 3 The bandwidth of the measurement instrument must be lt 500 MHz Mechanical electrical and environmental characteristics for the A6312 current probe are listed in Tables 2 through 4 and Figures 4 through 7
30. on Equipment Connections Equipment Settings A6312 Instructions Amplifier in TM Test oscilloscope Series Power Module 50 2 input Figure 9 Rise time test setup for A6312 Calibration generator Current probe Fast rise output Calibration fixture 1 Using a 50 BNC cable connect the amplifier output to a 50 Q oscillo scope input If the input impedance of your oscilloscope is 1 MQ connect a 50 Q feedthrough termination at the oscilloscope input Do not connect the termination at the amplifier output 2 Connect the current probe to the amplifier input 3 Connect the current loop calibration fixture to the calibration generator 50 Q fast rise output NOTE If your oscilloscope cannot trigger on the pulse use another BNC cable to connect the trigger output of the pulse generator to the trigger input of the oscilloscope Configure the oscilloscope for an external trigger Make or verify the equipment settings in Table 8 Table 8 Equipment settings for rise time Oscilloscope Vertical input impedance 50 Q Vertical gain 10 mV division Time base 2 ns division Record length 500 Coupling DC Offset 0 V mid scale Trigger type Edge Trigger mode Auto 17 Performance Verification Procedure 18 Table 8 Equipment settings for rise time Cont Oscilloscope Trigger position 5096 Acquis
31. onnect the current probe to the amplifier input connector align the tab of the probe connector with the slot in the amplifier input connector as shown in Figure 1 a Align the dot on the probe connector with the groove opening of the input connector as shown in Figure 1 b Push the probe connector in while twisting the barrel clockwise to lock the connector CAUTION Handle the current probe with care Do not drop the probe or subject it to impact or the core may crack Do not connect or disconnect the current probe while the probe is clamped around a live conductor or while the amplifier is powered on or the probe may suffer electrical damage Getting Started 2 Amplifier Push connector in and twist to lock Current probe connector ia f Tab Amplifier Groove Alignment dot a Align the tab with the connector slot b Insert the connector into the amplifier Figure 1 Connecting a current probe to the current probe amplifier Operating the Current Probe Slide The current probe has a slide mechanism that opens and closes the probe jaw This allows you to clamp the probe around a conductor under test The slide must be locked to accurately measure current or to degauss the probe If a probe is unlocked the PROBE OPEN indicator on the amplifier lights not insulated To avoid injury or equipment damage remove power from an uninsulated wire b
32. ons iii Table of Contents iv A6312 Instructions ee a General Safety Summary Injury Precautions Product Damage Precautions A6312 Instructions Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it Only qualified personnel should perform service procedures Avoid Electric Overload To avoid electric shock or fire hazard do not apply a voltage to a terminal that is outside the range specified for that terminal Avoid Electric Shock To avoid injury or loss of life do not connect or disconnect probes or test leads while they are connected to a voltage source Ground the Product This product is indirectly grounded through the grounding conductor of the mainframe power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded Do Not Operate in Wet Damp Conditions To avoid electric shock do not operate this product in wet or damp conditions Do Not Operate in an Explosive Atmosphere To avoid injury or fire hazard do not operate this product in an explosive atmosphere Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service personnel Do Not Immerse in Liquids Clean the probe using only a damp cloth Refer to cleaning instructio
33. oscillo scope input If the input impedance of your oscilloscope is 1 MQ connect a 50 Q feedthrough termination at the oscilloscope input Do not connect the termination at the amplifier output 2 Connect the current probe to the amplifier input 3 Connect the current loop calibration fixture to the output of the leveled sine wave generator Make or verify the equipment settings in Table 7 Table 7 Equipment settings for bandwidth Oscilloscope Vertical input impedance 50 Q Vertical gain 10 mV division Time base 200 ns division Record length 500 Coupling DC Offset 0 V mid scale A6312 Instructions Performance Verification Procedure A6312 Instructions Table 7 Equipment settings for bandwidth Cont Oscilloscope Trigger type Edge Trigger mode Auto Trigger position 5096 Acquisition mode Average Number of waveforms to average 8 Measurement type Peak to peak Leveled sine wave generator Frequency 3 MHz Amplitude 3 Vp Current probe amplifier Coupling DC BW limit Off full bandwidth Current division 10 mA division 1 Do not clamp the current probe around any conductor but make sure the jaws are locked shut 2 Press the amplifier PROBE DEGAUSS AUTOBALANCE button Wait for the degauss autobalance routine to complete before proceeding The routine is complete when the indicator light turns off 3 Clamp the current probe around the calibration fixture 4 Adjust the signal genera
34. osition control 2 Setthe oscilloscope input coupling to DC 3 Move the oscilloscope trace to the center horizontal graticule line using the AMS503 DC LEVEL control 4 Do not clamp the current probe around a conductor but make sure the jaws are locked shut Press and release the DEGAUSS button Set the AM503 input coupling to DC Set the AM503 BALANCE adjustment to mid position ger d ooo TUA Adjust the A6312 DC Offset control so that the oscilloscope trace is on the center graticule line zero offset 2 divisions 9 Press and release the DEGAUSS button 10 If necessary readjust the A6312 DC Offset control so that the oscilloscope trace is on the center graticule line zero offset 2 divisions 29 SETS A IUUUmE I Maintenance Cleaning A This section explains how to clean the A6312 current probe and if necessary disassemble the probe for maintenance or repair Also included are instructions for preparing the probe for shipment WARNING Probe disassembly should only be performed by qualified service personnel To clean the probe body use a soft cloth dampened in a solution of mild detergent and water To clean the core open the jaw and clean the exposed core surfaces with a cotton swap dampened with isopropyl alcohol isopropanol or ethyl alcohol fotocol or ethanol Do not lubricate the jaws mating surfaces Any lubricant between the core pieces should be removed with a recommen
35. ough your local Tektronix field office or representative Refer to the Replaceable Parts List on page 35 for more informa tion Preparation for Shipment If you must ship your Tektronix product please use the original packaging if possible If the original packaging is unfit for use or not available use the following packaging guidelines 1 Use a corrugated cardboard shipping 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 a plastic bag or wrap to protect it from dampness 3 Place the probe into the box and stabilize it with light packing material 4 Sealthe carton with shipping tape 34 A6312 Instructions ee ee Replaceable Parts This section contains a list of the components that are replaceable for the Current Probe As described below use these lists to identify and order replacement parts Parts Ordering Information Replacement parts are available from or through your local Tektronix Inc service center 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 Therefore when ordering parts it is important to include the following information in your order m Part number m Instrument type or model number Instrument serial number Instrument modifi
36. rent Source Output 20 turns BNC to dual banana adapter E gt o o 50 Q termination 50 Q coaxial cable Figure 10 DC gain accuracy test setup for A6312 Equipment Settings Make or verify the equipment settings in Table 9 Table 9 Equipment settings for DC gain accuracy Digital multimeter Measurement type DC volts Range Autoranging Current source Output Off Current probe amplifier Coupling DC BW limit On Current division 1 mA division Procedure 1 Do not clamp the current probe around any conductor but make sure the jaws are locked shut 2 Press the amplifier PROBE DEGAUSS AUTOBALANCE button Wait for the degauss autobalance routine to complete before proceeding The routine is complete when the indicator light turns off 3 Clamp the current probe around the 20 turn current loop as shown in Figure 10 Verify that the arrow shaped indicator on the probe points away from the current source 20 A6312 Instructions Performance Verification For each of the amplifier current division settings in Table 10 perform the following steps a b Set the Amplifier to the desired current division setting from Table 10 Set the current source to the correct positive test current using Table 10 Turn on the current source Record the exact measurement of the digital multimeter as M7 You can copy Table 11
37. select the AM503B or AM5030 amplifier the procedures verify the A6312 probe to 100 MHz and the probe is then interchangeable between either amplifier m If you select the AM503 amplifier you must verify the probe and AM503 as a system The procedures verify the A6312 probe to 100 MHz and the probe is not interchangeable with any other amplifier or system m Ifyou select the AM503A amplifier you must verify the probe and AM5S503A as a system The procedures verify the A6312 probe to 80 MHz and the probe is not interchangeable with any other amplifier or system 13 Performance Verification Bandwidth 14 Equipment Connections Equipment Settings This procedure tests the bandwidth of the A6312 current probe In this test you measure a signal at a relatively low frequency and again at the rated bandwidth of the probe The two measurements are compared to verify that the signal amplitude does not fall below 3 dB at the probe bandwidth Refer to Figure 8 when making equipment connections Amplifier in TM Test oscilloscope Series Power Module Leveled sine wave generator Current probe Output 50 Q oscilloscope input or add 50 Q termination here if oscilloscope has only high impedance input Calibration fixture Figure 8 Bandwidth test setup for the A6312 current probe 1 Using a 50 BNC cable connect the amplifier output to a 50 Q
38. sting R364 HF COMP located inside the AM503 amplifier Refer to the AMS03 Instruction Manual 070 2052 XX for instructions on how to access this adjustment This information is in the service section of the manual and the adjustment should be performed by qualified service personnel only DC Gain Accuracy This procedure tests the DC gain accuracy of the A6312 current probe In this test you compare the voltage output of the amplifier to a reference input Current Loop for DC Gain You will need to construct a simple current loop in order to complete the DC Accuracy Check gain accuracy tests WARNING Magnetic fields are produced that may cause a malfunction in heart pacemakers or damage to sensitive equipment Construct the loop using a cylindrical form approximately 3 inches in diameter wind exactly 20 turns of 427 coated wire NOTE Ensure that the current loop has exactly 20 turns A significant error will result for each turn variance from 20 turns Equipment Connections 1 Using a BNC cable connect the amplifier output to the 50 Q feedthrough termination Attach the termination to a BNC to dual banana adapter Taking care to observe and maintain polarity insert the dual banana adapter into the digital multimeter DC voltage input 2 Connect the current loop to the current source as shown in Figure 10 A6312 Instructions 19 Performance Verification Amplifier in TM Series Power Module Cur
39. the end of the bottom half of the probe body Figure 13 Removing the top half of the probe 1 Hold the bottom half of aaa the probe body in one hand SS 2 Grasp the top half of the probe body here with your other hand then a push the slide back slightly and b withdraw the slide from the probe body Figure 14 Removing the probe slide A6312 Instructions Maintenance 6 If you want to replace the current transformer lift the front edge of the circuit board and transformer out of the probe and then pull the transformer out of the circuit board socket 7 To remove the circuit board unsolder the two connections then lift the strain relief and circuit board from the body half Refer to Figure 15 Current transformer Figure 15 Removing the current transformer 8 Before reassembling the probe be sure that the gap between the stationary and moveable core pieces is clean If necessary use isopropyl alcohol or a similar cleaning agent to clean the pieces Also clean the contacts of the slide switch if necessary Should the plastic slide assembly require lubrication sparingly apply silicone based grease to the parts Probe reassembly is the reverse of steps 1 through 7 NOTE Exercise care when fitting the slide back into the probe body aligning the switch contacts can require patience A6312 Instructions 33 Maintenance Obtaining Replacement Parts Replacement parts may be obtained thr
40. tor output so that the amplifier output is approxi mately 60 mVp p or six graticule divisions on the oscilloscope 5 Using the peak peak measurement capability of the oscilloscope measure and record the peak peak reading as Mj 6 Setthe oscilloscope time base to 5 ns division Increase the signal generator frequency to the warranted bandwidth Refer to Table 1 on page 7 7 Using the peak peak measurement capability of the oscilloscope measure and record the peak peak reading as M2 15 Performance Verification Rise Time 16 8 The probe meets the bandwidth specification if the ratio of the signal amplitude at the warranted bandwidth is at least 70 7 of the signal amplitude at 3 MHz Using the following calculation verify probe band width M s 0 707 NOTE The impedance of the calibration fixture used in this test changes between 3 MHz and 100 MHz Typically the impedance changes from 50 at 3 MHz to 59 Q at 100 MHz Thus you can substitute the following equation to make this test more accurate At 100 MHz M aas sr gt 0 707 For the AM503A at 80 MHz M aas gt 0707 9 Verify that the bandwidth is greater than the warranted specification Refer to Table 1 on page 7 This procedure measures the rise time of the A6312 current probe In this test you directly measure the rise time of a step input Refer to Figure 9 when making equipment connections A6312 Instructions Performance Verificati
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