Tektronix P7225 manual

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56

Go to page of

A good user manual

The rules should oblige the seller to give the purchaser an operating instrucion of Tektronix P7225, along with an item. The lack of an instruction or false information given to customer shall constitute grounds to apply for a complaint because of nonconformity of goods with the contract. In accordance with the law, a customer can receive an instruction in non-paper form; lately graphic and electronic forms of the manuals, as well as instructional videos have been majorly used. A necessary precondition for this is the unmistakable, legible character of an instruction.

What is an instruction?

The term originates from the Latin word „instructio”, which means organizing. Therefore, in an instruction of Tektronix P7225 one could find a process description. An instruction's purpose is to teach, to ease the start-up and an item's use or performance of certain activities. An instruction is a compilation of information about an item/a service, it is a clue.

Unfortunately, only a few customers devote their time to read an instruction of Tektronix P7225. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.

What should a perfect user manual contain?

First and foremost, an user manual of Tektronix P7225 should contain:
- informations concerning technical data of Tektronix P7225
- name of the manufacturer and a year of construction of the Tektronix P7225 item
- rules of operation, control and maintenance of the Tektronix P7225 item
- safety signs and mark certificates which confirm compatibility with appropriate standards

Why don't we read the manuals?

Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of Tektronix P7225 alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of Tektronix P7225, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the Tektronix service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of Tektronix P7225.

Why one should read the manuals?

It is mostly in the manuals where we will find the details concerning construction and possibility of the Tektronix P7225 item, and its use of respective accessory, as well as information concerning all the functions and facilities.

After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.

Table of contents for the manual

  • Page 1

    Us er Man u a l P7225 2.5 GHz 10X Active Probe 071-1 187-01 W arn in g T he serv icin g in stru ction s are fo r use b y q ualified pe r s onne l onl y . T o a voi d pe r s ona l i nj ur y , do not p erform an y servicin g u nless yo u are q ualified to d o so . R efer to all safety su mm aries prio r to p erform ing serv ice. ww w .t e kt r onix .[...]

  • Page 2

    Copyright © T e ktronix, Inc . A ll ri ghts re s erve d. T ekt ronix product s are cove red by U.S. and fore ign pat ents, i s sued and pendi ng. Informa tion i n this publi cat ion superce des that in a ll pre viously publi s hed mat eria l. Speci fica tions a nd pric e c hange privi lege s reserved. T ekt ronix, Inc. , P .O. Box 500, Beave rton,[...]

  • Page 3

    W ARRANTY T ek tro nix w arran ts that th e sy stems th at it man ufactu res an d sells, (ex clu din g cu stom er -sup p lied equ ip men t), w ill b e free fro m defects in materials and w o rkm ansh ip fo r a p eriod o f o ne (1) year . T h e w arran ty perio d shall beg in o n the date of installatio n o r o n e (1 ) mo nth after th e d ate of sh[...]

  • Page 4

    [...]

  • Page 5

    P7225 2. 5 GHz 10X Act ive Probe U ser M anua l i T abl e of Contents Gen eral S af ety S u m ma ry v ............................ Pr efa ce vii ............................................ Related M an uals vii .................................... Co ntactin g T ektro nix viii ................................. Pr od u ct D es crip t ion 1 ........[...]

  • Page 6

    T abl e of Conte nts ii P7225 2. 5 GHz 10X Act ive Probe U ser M anua l Lis t of Figur es Fi gu re 1: P 7225 Prob e featuri n g th e T ekC onn ec t Interfac e 1 F ig ure 2: Co nnec ti ng and di sco nnec ti ng the pro be 2 ....... Fi gu re 3: P r obe fu nctional chec k c on necti on s 15 ........... Fi gu re 4: Dyn amic and offset li mitations 18 ..[...]

  • Page 7

    T abl e of Conte nts P7225 2. 5 GHz 10X Act ive Probe U ser M anua l iii Lis t of T abl es T ab le 1: P 7225 features and s tand ard ac cessorie s 5 ........ T ab le 2: P 7225 option al ac cessorie s 12 ................... T ab le 3: W arra n ted electrical sp ecifica tio n s 29 ............. T ab le 4: T ypical e lec tric al characte ristic s 29 .[...]

  • Page 8

    T abl e of Conte nts iv P7225 2. 5 GHz 10X Act ive Probe U ser M anua l[...]

  • Page 9

    P7225 2. 5 GHz 10X Act ive Probe U ser M anua l v General Safet y Summ ary Revi ew the fol lowing safet y preca utions to a void inj ury and preve nt dam age t o this product or a ny products conne cte d to it . T o avoi d po tential hazard s , us e this pr oduct onl y as spec ifie d. O nly qu alified p er s onnel should pe r form servic e pr oc ed[...]

  • Page 10

    G ener al Saf ety S ummar y vi P7225 2. 5 GHz 10X Act ive Probe U ser M anua l Safety T erms and S ymbol s T erms i n This Manual . Th es e terms may app ear in th is manu al: W ARNING. W ar nin g sta tem ents id entify c ondi tions or pract ice s that cou ld r es ult in inju r y or los s of life. CAUTION. Cau tion s tatem en ts iden tify c ondit i[...]

  • Page 11

    P7225 2. 5 GHz 10X Act ive Probe U ser M anua l vii Preface Thi s is the User Manua l for t he P7225 probe . T his ma nual provide s op eratin g inf or mation , sp ecificatio ns , and a rep laceable par ts lis t. Re late d Manuals If you nee d to do a pe rformanc e veri fica tion or m ake i nterna l adj us tm ents to your probe , refe r to the P722[...]

  • Page 12

    Pre fa c e viii P 7225 2.5 G Hz 10X Acti ve P robe Us er Manual Conta cting T ek tronix Phone 1-800-833-9200 * Address T e ktronix, Inc . Depart ment or na me (i f know n) 14200 SW Karl Bra un D rive P . O . Box 500 Bea verton, OR 97077 USA Web s ite ww w .t ektroni x.com Sales support 1-800-833-9200, sel ect opt ion 1 * Service support 1-800-833-9[...]

  • Page 13

    P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 1 Product Description The T e ktronix P7225 is a 2. 5 G Hz, 10X ac tive probe. T he P7225 has a ≤ 0.8 pF input c apac ita nce a nd a high i nput resista nce (40 k Ω) ,t o minimize cir cuit lo adin g o ver the s pecif ied b and w idth . The s mall profil e and l ow -ma s s head of t he P7225 make p[...]

  • Page 14

    Product Descript ion 2 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l Whe n t he probe is c onnect ed, the host instrum ent rea ds E EPRO M inform ati on from the probe , ide ntifyi ng the de vice and a llowing t he appropri ate power suppli es to be powere d on. The prea mp input s on the host instrum ent are e lec trostat ic discha r ge protec t[...]

  • Page 15

    Product Descript ion P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 3 Options The fol lowing opti ons a re ava ilabl e when orde ring the P7225 probe: H O ptio n D 1 — Calib ratio n D ata Repor t H O p t i o nC 3—3y e a r sC a l i b r a t i o nS e r v i c e H O p t i o nD 3—3y e a r sC a l i b r a t i o nD a t aR e p o r t (requi res Option [...]

  • Page 16

    Product Descript ion 4 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l[...]

  • Page 17

    P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 5 Feat ures and Accessories The P7225 is provide d with severa l fea tures and a cc ess orie s designe d to make pr ob ing an d meas ur ement a simp ler tas k. T o familiarize yourself wit h these i tem s and t heir uses, re fer to T a ble 1. W ARNING. T o av oid inj ur y , use car e whe n handling a [...]

  • Page 18

    F eatur es and A cces s or ies 6 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l T abl e 1: P7225 feat ures and st andard accessor ies (Cont.) Feature/Accessory D escription Push-in probe tip Push - in probe tip. Use the pus h - i n probe tip for general purpos e probing by hand. The push-i n probe tip m ay al so be us ed with the other soc keted l[...]

  • Page 19

    F eatur es and A cces s or ies P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 7 T abl e 1: P7225 feat ures and st andard accessor ies (Cont.) Feature/Accessory D escription Three - - inch ground lead Three - inch ground lead . Us e t he t hr ee- i n c h ground lead for general probing. The s ock eted end of the lead m ay be c onnected to any of th[...]

  • Page 20

    F eatur es and A cces s or ies 8 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l T abl e 1: P7225 feat ures and st andard accessor ies (Cont.) Feature/Accessory D escription Custom izable ground lead Customizable ground lead. Y ou can bend or shorten thi s ground l ead wire. NOTE : T o eas e ins ertion i nto the ground soc ket of the probe, cut the[...]

  • Page 21

    F eatur es and A cces s or ies P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 9 T abl e 1: P7225 feat ures and st andard accessor ies (Cont.) Feature/Accessory D escription Square pin socket Square pin socket . The square pi n soc ket i s ideal for use with s ignal /ground pairs on 0.100 inc h squareheader pi ns. Attach the s ock et by gentl y pre[...]

  • Page 22

    F eatur es and A cces s or ies 10 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l T abl e 1: P7225 feat ures and st andard accessor ies (Cont.) Feature/Accessory D escription Cable marker bands Cable marker bands . Attach matc hing pai rs of the mark er bands onto the c able at the head and com pensati on box of eac h probe. The mark er bands enabl[...]

  • Page 23

    F eatur es and A cces s or ies P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 11 T abl e 1: P7225 feat ures and st andard accessor ies (Cont.) Feature/Accessory D escription Accessory reorder sheet. Use the acces sory reorder sheet as a quick gui de for ordering ac ces sori es for y our probe. The sheet provi des photos and part numbers for identi[...]

  • Page 24

    F eatur es and A cces s or ies 12 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l T abl e 2 li s ts the opt ional ac cessories you ca n order for your P7225 probe. T abl e 2: P7225 optional accessories Accessory D escription SureFoot adapter SureFoot probe adapter . The SureFoot adapter is an integral probe tip and m ini ature guide that enables fa[...]

  • Page 25

    F eatur es and A cces s or ies P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 13 T abl e 2: P7225 optional accessories (Cont.) Accessory D escription T ekC onnect Interface calibration fixture. The cal ibrati on fix ture is required when a performanc e veri fic ation or adj ustm ent is done on the probe. It provi des connec tors and test points fo[...]

  • Page 26

    F eatur es and A cces s or ies 14 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l T abl e 2: P7225 optional accessories (Cont.) Accessory D escription Probe Calibration and D eskew Fixture. This fix ture provi des an edge s ource to ti me al ign (d eskew ) an d to op timize ho st instr umen t gain and of fset ac curac y at the probe ti p. T ek tron[...]

  • Page 27

    P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 15 Functi onal C hec k A functi onal c heck m ay be pe rformed using t he PRO BE COM- PENS A T IO N c onnect ions on t he front panel of the host instrum ent. S e eF i g u r e3 . NOTE . If you ar e not fam ilia r w ith the op er atio n of the ho st instrument, pl ease r e fer t o the user manual f or [...]

  • Page 28

    Functi onal Chec k 16 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 3. Us ing a ground l ead a nd SM T KlipChi p, conne ct t he probe ground to t he instrum ent ground on t he host instrum ent. 4. Us ing a sta ndard ti p, hold t he probe t o the c ente r conduct or of the PRO BE COM PENS A T IO N out put on the host instrument . 5. Pre ss AUTOSE [...]

  • Page 29

    P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 17 Confi gura tion The P7225 provides the host instrume nt w it h t he probe model numbe r , seri al num ber , a nd att enuat ion fac tor . W hen conne cte d to a host instrume nt w it h a T e kConnect Int erfac e, displa y re adouts are corre cte d for the probe a tte nuati on fa ctor , the instrum e[...]

  • Page 30

    Configura tion 18 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 6. Ch ang e the volts /d ivis io n s etting to the des ired rang e, adjus ting the o f f s et to k eep th e trace o n th e zero refer ence lev el. NOTE .T h e P7225 has a ± 10. 0 V of fset range. The input vol tage li near operati ng range i s ± 4 V . See Fi gur e 4. If c ur sor s [...]

  • Page 31

    P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 19 Operatin g Basics P leas e follo w th es e oper ating g uid elines to get optimu m perfo rman ce from your P7225 probe. Ha ndling the P robe Exe rcise c are when using a nd s tori ng the P7225. T he probe a nd cabl e are suscept ible t o da mage c aused by c arel ess use. Always handle t he probe u[...]

  • Page 32

    O per ating B as ics 20 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l Input Linear Dyna mic R ange The probe hea d ampl ifie r us ed by t he P7225 has a limited linear opera ting range . The usable dyna mic ra nge is ± 4.0 V howeve r , to kee p the i nput li neari ty error l ess tha n ± 0.1 %, y ou mus t limit th e appa rent signal i nput volta[...]

  • Page 33

    O per ating B as ics P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 21 1.7 in Y lead adapt er with 2 SM T KlipChips Probe with only short ground pogo pin T est pulse without probe 3 in Ground lead on square pin Figure 5: T ypical eff ects of usi ng a pr obe tip adapter Ground Lead Le ngth Whe n you are probi ng a ci rcuit , al w ays use as short a[...]

  • Page 34

    O per ating B as ics 22 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l T est pulse without probe Probe with only short ground pogo pin Square pins on test board (no signal or ground length) 1.7 in Y lead adapt er 3.0 in Ground lead with SM T KlipChip Figure 6: W avefor m di st ort ion from ground lead length Ground Lead Inductance Whe n you touch [...]

  • Page 35

    O per ating B as ics P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 23 V s ourc e Probe C in ≤ 0. 8 pF L gl (ground lead) Figure 7: Ground l ead equival ent circuit Rin gin g and r is e time degr adatio n can be mas ked if th e freq uen cy cont ent of t he signal de gradat ion is beyond t he bandwidt h of the host ins tr umen t. Y ou c an det er[...]

  • Page 36

    O per ating B as ics 24 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l[...]

  • Page 37

    P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 25 Helpf ul Hint s Follow the s e he lpful hi nts to ma ke probing e asier a nd noise free . Low - induc tanc e Grounding Plac ing a ground pl ane on t op of the IC pa ckage be ing probed c an minimize g r ound lea d lengt h and induc tanc e. See Figure 8. Figure 8: Low- inductance grounding Atta ch a[...]

  • Page 38

    H elpf ul H in ts 26 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l Thi s me thod is very useful when m aking m any me asureme nts on the same pa ckage . U sing a ground pl ane on the IC packa ge make s probing t he IC pac kage e asier a nd avoids addi ng unnece s sary ground le ad le ngth and di s tort ion. Sur e Foot Grounding If you c annot use[...]

  • Page 39

    H elpf ul H in ts P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 27 Pr obe Tip T es t Points Y ou c an solder t he push-in probe t ip or a 0. 025 inch square pi n to a ci rcuit , to be us ed as a tem porary test point . S ee Figure 10. Solder t he push-in probe t ip onto a l ead or pi n w it h a low-power solderi ng iron. Press the probe he ad ont[...]

  • Page 40

    H elpf ul H in ts 28 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l[...]

  • Page 41

    P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 29 Appe ndix A : Spec ifi ca tions The probe a nd host instrum ent must first be al lowed to w arm up for 20 minu tes bef or e meas ur ements ar e tak en. Specific ations CAUTION. T o pr e vent damage to the pr obe or cir c uit under test, do not apply v oltage s bey ond t he nondestructi ve input v o[...]

  • Page 42

    Appendix A: Spec ific ati ons 30 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l T abl e 4: T ypi cal electrical character istics (Cont.) Lineari ty ᐔ 0.1% over a dy nami c range of - - 3.75 V to + 3.75 V ᐔ 1.0% over a dy nami c range of - - 4.0 V to + 4.0 V Nondestructi ve Input V oltage Range - - 30 V to +30 V (DC + peak AC) Input Resis tance[...]

  • Page 43

    Appendix A: Spec ific ati ons P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 31 45 K Ω 11 0 ° 40 K Ω 35 K Ω 30 K Ω 25 K Ω 1 MH z 10 MH z 100 MH z 1 GHz 10 GHz 90 ° 70 ° 50 ° 30 ° 10 ° -- 1 0 ° -- 3 0 ° -- 5 0 ° -- 7 0 ° -- 1 1 0 ° -- 9 0 ° 20 K Ω Frequency (Hz) Input I mpedance Magit ude (ohms) Phase (degrees) 15 K Ω 10 K[...]

  • Page 44

    Appendix A: Spec ific ati ons 32 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l Frequency 100 MHz 10 MHz 10 GHz 1G H z -- 1 7 -- 2 0 -- 2 3 -- 2 6 -- 2 9 -- 3 2 Gai n = 20 Log Ꮛ V OUT V IN Ꮠ Gai n dB Figure 12: T ypical bandwidth[...]

  • Page 45

    Appendix A: Spec ific ati ons P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 33 31.8 m m (1.250 in) 43.8 m m (1.725 in) 63.5 m m (2.500 in) 91.5 m m (3.600 in) 57.2 m m (2.250 in) 7.6 m m (0.300 in) 7.6 m m (0.300 in) Figure 13: Pr obe head and compensation box di mensions T abl e 5: Physical charact eristics Net w ei ght 1.41 kg (3.1 l bs) Cable [...]

  • Page 46

    Appendix A: Spec ific ati ons 34 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l T abl e 7: Cert ifications and com pliances Category Standards or description EMC c ompl ianc e This product has been revi ewed to the conditi ons and prov is ions of Directi ve 89/336EEC for products of the EN61326 product fa mily and determi ned to be exem pt from th[...]

  • Page 47

    P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 35 Appe ndix B : Use r Se rvi ce Thi s sect ion expla ins t he mai ntena nce for the P7225 probe. Inspe ction a nd Cle aning CAUTION. T o pr e vent damage t o pr obe mate rials, do not use che m ic als t hat contai n be nzine, benzene , tolue ne, xy lene , acet one, or s im ilar s o lvents . D o n ot [...]

  • Page 48

    Appendix B: User Servic e 36 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l Pr e paration for Shipment If the ori ginal pac kaging i s unfit for use or not a vail able , use the foll ow ing pa ckagi ng guidel ines: 1. Us e a c orrugate d cardboa rd shipping ca rton havi ng inside dim ensions a t lea s t one inc h gre ate r than the probe dim ensio[...]

  • Page 49

    P7225 2. 5 GHz 10X Act ive Probe U ser M anua l 37 App endix C: Replaceab le Parts This s ectio n contain s a lis t of replaceable parts f or the P 7225 probe. U s e this lis t to iden tify an d or der r eplacemen t parts . Parts Or de ring Informa tion Rep lacement p arts are availab le fr om o r th r ough your loc al T ektro nix , Inc. s erv ice [...]

  • Page 50

    Appendix C: Re plac eabl e Parts 38 P7225 2. 5 GHz 10X Act ive Probe U ser M anua l Usin g th e Replaceab le P art s List The tabu lar inf or mation in th e Replaceab le Par ts Lis t is ar ran ged f or qu ick retr ieval. U nd ers tan din g the s tru ctur e and featu res of the list w ill help yo u fin d the inf or mation y ou n eed fo r or der ing [...]

  • Page 51

    A pp end ix C: Rep laceable P arts P7225 2. 5 GHz 10X Acti ve Probe U ser M anual 39 1 2 Figure 14: P7225 r eplaceabl e par ts Fig. & index no. T ektron ix part no. Seri al no. Effective D scont Qty 12345 n ame & descr ipti on Mfr . cod e Mf r . part no. 14 - - 1 010 - - 0694 - - XX 1 PROBE, FET ACT : 2.5 GHZ ,10X, ≤ 0. 8 PF , TDS SER IES[...]

  • Page 52

    Appendix C: Re plac eabl e Parts P7225 2. 5 GHz 10X Acti ve P robe User M anual 40 1 2 3 4 5 6 7 8 9 10 11 12 Figure 15: P7225 st andard accessor ies[...]

  • Page 53

    A pp end ix C: Rep laceable P arts P7225 2. 5 GHz 10X Acti ve Probe U ser M anual 41 Fig. & index no. T ektron ix part no. Seri al no. Effective D scont Qty 12345 n ame & descr ipti on Mfr . cod e Mf r . part no. ST ANDARD ACC ESSORI ES 15 - - 1 196-3456-XX 1 LEAD SET ; ACC ESSORY KIT 060D9 196-3456-XX - - 2 196-3482-XX 1 CU STOMI ZABLE GRO[...]

  • Page 54

    Appendix C: Re plac eabl e Parts P7225 2. 5 GHz 10X Acti ve P robe User M anual 42 1 2 3 4 5 6 7 8 Figure 16: P7225 opt ional accessories[...]

  • Page 55

    A pp end ix C: Rep laceable P arts P7225 2. 5 GHz 10X Acti ve Probe U ser M anual 43 Fig. & index no. T ektron ix part no. Seri al no. Effective D scont Qty 12345 n ame & descr ipti on Mfr . code Mf r . part no. OPTI ONAL A CCESSOR IES 16 - - 1 SF501 1 ADPT R,SU REFOOT : 50 MIL J EDEC, PKG OF 12 060D9 SF501 - - 2 SF502 1 ADPT R,SU REFOOT : [...]

  • Page 56

    Appendix C: Re plac eabl e Parts P7225 2. 5 GHz 10X Acti ve P robe User M anual 44 CROSS INDE X - M FR. CO DE NUM BER TO MANUF ACTURER Mfr. cod e Man ufactur er Ad dress Ci ty , State, Zi p code 80009 TEK TRONIX INC 14150 SW KAR L BRAUN DR PO BOX 500 BEA VER TON OR 97077 - - 0001 060D9 TENSO LITE CO MP ANY PREC ISION H ARNESS AND ASSEM BL Y~3000 CO[...]