GR's New Bolton Plant - GenRad Experimenter Feb 1964

GR's New Bolton Plant - GenRad Experimenter Feb 1964
THE
GENERA L
VOLUME 38
RA D I 0
FEBRUARY, 1964
NUMBER 2
IET LABS, Inc in the GenRad tradition
534 Main Street, Westbury, NY 11590
www.ietlabs.com
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
THE
GENERAL
R ADIO
fXr fR IMfNTfR
The
General
Radio
EXPERIMENTER
is
moiled
wilhOCJI
charge each monlh 10
engineers, scien'i,'s,
technician" and others
inlerested in eleclronic
lechniqve. in meowr.menl. When Rnding
requesls for SUbK';Plions and address·
change notices, p1eose
supply the following
informalion : nome,
company address, Iype
of business company i,
engaged in, and title or
position of indi.,idvol.
(O,,,4_0ENUAl "',010 CO M' ... NY, WlSl CONCOID, M... U.. u.s .....
PuWiwel MomlJy by ,II. G.,..rol Roclio Company
VOLUME 38 • NUM8ER 2
FEBRUARY 1964
CONTENTS
Page
GR', New Bolton Plant
3
The Precise Meawremenl af Srnoll Dimensions by 0
Copocilonce Bridge . • . . _ . • _ . • . .
.4
New, Megohm, Wire· Wound Resistors ond Decades
5
Meosuremenh on Power Tran~ $tou wilh the Tronsfer·
7
function Bridge • , . . , • • . • , . • . . •
GENERAL
RADIO COMPANY
West Concord, MCl sso(h usetts' , 01781
'II'Iepllco"., (Concord) 369- 4400/ (1oIIC>l\) 646·7400
A .... Cod. N"",I,e.,. 611
MUIO'OUT ... N ..... 01 ............, U.. d . .. , lI 'd,.'I . ld . N. J " 07457
NEW you,·
'II'IerJo-- N. Y., 212 964·2722
N. J., 201 943 ·"40
SYIIACUSE,
rI. k•• d Bulld ' "II, h,1 Mollor 110001,
Sr"u", N. Y.. 13211
'II'IerJo--315 454.9323
'HIl ... on'HI ... ,
IUD Yorll . . .01, A .. I" ,IOI. , " • •, 19001
T.l.rJo-- ' ''''''., 2I5 424.1419
Abinllloll,215 U7·8486
"I"
W ... SHINOTON · I.~hlll .
01 won lo ... , 1I.<hlll., Mol " '01.52
... 01 IALTlMOIlE , '~_301 946. 1600
COVEll
TI" I ....... ~ . .. d .. ~I ••• • 1
'y ,.. 900 " ••• 101 ... C.·
.,,1.1 c ......
<1... ..•
..........01 I. .... ...11·
li ... lh .f ... I .. <h "'I' Ih.
16n-A C."ul.
1..... 801018" s. . ... , • •.
OIllANDO,
In E.,I C.I...lol 0 ,1 ..., Orl... d • • 'I_i do, 32101
r.l.pIo .... _ 305 425. 467 '
CHICAGO,'
660S W U I N.,lh A ..... " ., Ook '0111, 111111 _1., 60302
rll'leploone-3 12 84 8-9400
ClEVElAND,
5579 , . _1 , CI . ... I. .. oI. Oh l•• 44129
r.IepIoone-2I6 886 .0 ' 50
DAllAl,
2501 · A W .. I Mu. , ",bi.dl ..... DolI .., h .... 7S 23S
T./ephone _ 2 14 FI..'wood7· 4031
lOS "'NGElES:·
1000 N..th SewOId St .• lot A .. , . I.. I , C••. , 900ll
'.",, _ _ 2 13 469.6201
S"'N 'IIANClSCQ , 1I16 lu ... h •• A ...... l ..... " .., c.i., 94022
r,I.""""- 4 15 9 "8 ·8233
99 FI.,.I ,., • •• .,. ,., ...,. IS, On •• ,lo
TOION TO ,'
r~-416
247·2111
M ON'UAl:
Olflc. 395 125S l."'d 11 .. 01 ., town 0' M ..... I 11.,..1,
O ... .. u
''1''''
r./eplo .... _ 5'4
737.3673, . 3674
GENE . ... l IIADIO COM'A NY (OVERSEAS ), tUIIICH , SWIlZElll ... ND
U'UUNTAnVU IN ,IIIHCI'Al OVEllnAS COU NtalU
IET LABS, Inc in the GenRad tradition
534 Main Street, Westbury, NY 11590
www.ietlabs.com
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
GR'S NEW BOLTON PLANT
Enrly in February, uhout J.'iO CCII('mi
Hntlio cmpJoyf'f'S will s hift thcir cluily
olwrations ubouL 10 miles w('sl of Concord , to our new plant in BollOII , ~ 1 1 16S.
Thus begins a IH'W and 8ignili('u nL phase
in the growth of General Radio.
iA'S$ t.h an six yCtlrs have puSSt'd
since en "wont suburban," moving
from Cambridgl' to its new :100,000squurl'-foot h('udquartefS in W<',,' COIlcord. On ly a few years aftl'r this move,
11 l()().u('re tf:Wt. in nearby Bolton was
pur('hu.S<'d in prf'pamtion for the Ilf'xt
major Company expa ns.ion.
The decision to divert cxpu nsioll 10
n lIew site rather than t.o cOlllinuc
building on our 88-ncrc COIll"ord property wus b.'lscd on scvcr:d flleton;. ,\ Iainlnining the "smtlll company" famili·
arity long enjo.."l,<1 by our cmpluYl.'e1>
would bceomc more difficult liS the
Concord plllnt population grew. T raffi (',
too, would h('('ome u problem. It W!~S
lIH'r('fnr(' d('l'icied that th(' working fon'e
at Cun{'ord !<hould 1)(' limitl'd In 1000.
A~ the numher of e mployl't'!i 111. ('OIJ('ord
paF..'«'d noo a year ago, en n ~t r1H·tion
ht'gan on It bu ilding in Boltoll .
'I'll(' new plant will Ix> SlCt. up aulonomou~ly on a produl't basi.<I. de,,:igning lind mauufaduring mi('ro\\'Il\,(' und
!'ignal-gl'lwratillg equipment. Therefore, ill the futu re, all R couxinl con-
c:
nectors and componCllt.<;, slot.ted lines,
('oaxial bridges, Pnit. Osci llators, and
signal generators will Iw mnde at t he
Bolton pl:1l1t, which is spc<'iully
<'quipped with the high-prcdl<ion produ(·tion m:whinery requi red in t he manufactu re of sueh items.
The long-term plans for Bolton include a pltUlt about. t he samc size as
our prl'SCllt plllnt at Concord and in
the S3me multiple-tet.' configuration.
The build ing just completed is tbe fin;t.
h.'C, and the design of this BO,OOOsqua re-foot. unit provid('s for t he event.ua l expansion to over three times it:;
prescnt size.
The Bolton r-itc is on State Route
11i , 1C'SS 1h:1II two miles cast of the intefSCl'tion with In te~tate Haute 4U.),
now under construction. The plunt site
is partly wooded, with n str<'am
d:lmm('(1 to fo rm tl small pond . Bolton
is a smnll , rum l community of 1200, on
t he eastern Nlge of Worcester county ,
and a hout. 20 mil('!' west of Houte 128.
Enginccring :\ I:umgcr of the Bolton
plant is itob<'rt A. Ro<ll'rma n, w('11
known ill the clf'ctroni('s ind ustry for
his work on standa rds and 011 coax ial
measuring devit'cs. Philip W. Powers,
former ly .\ S.',1 i~tant to t he Yice President for ~lllnuractur i ng, becomes :'Ibnufucturing ~ 1 1l1\:lgc r at Bolton.
,
3
IET LABS, Inc in the GenRad tradition
534 Main Street, Westbury, NY 11590
www.ietlabs.com
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
~
GE N E R A L
RADIO
EX PERIMENTER
THE
PRECISE MEASUREMENT
OF
SMALL DIMENSIONS
BY A
CAPACITANCE BRIDGE
One of t.he advnntngcs of being n
manufaeturer of preci!;ion mt'tl."uring in·
s truments is the chance to Il.pply 01\('
prcrision u('\' ic(' to the design :Ind pro·
ductit)1I of l.nol her. An exa mple is Ilu}
use of our T\I'~: IG1;)· A I'rCl'isi{)n
(0.01 <;;:,) C ll.pn('ihllU"e BTidg{\ to m('nSlllJ"('
dimension!! of purts of our T\ I'E \)()()
Prcd s io n Coaxilli COIIIH'(-tor to within
(L few milliOlLlhs of lin illeh .
The prindplc of Illcllliuring di~huH'c
hy mem.;u ring ('l'pll.cittHlI"c is ba~1 on
the rclation hclw('cll the Nl.pnritlm cc of
an air cnp:teitor nnd the bplH"ing he·
tW('('1l its ('il,t:lrodc.<>:. In till' liPpli('a..
tion des('ribe<i her<', n rod i;.: po:oilioned
in n hollow (,ylinder wit h a fixt'<l ~p:tdng
betwccn the rod :111(1 11ll' in;;idC' wall of
the rylindt'r. The rod and ihl' ('ylindcr
form the de(·trod('~ of 11 C':lpacitor.
~inec the Ilollow ey lindt'r is II ~ pe{' i1l1
jig whose dimens iuns nrr :l('rurat eiy
known , the spul'illg i!; gm·<.'rnt'<i rsscnHally by the dhLmetcr of the rOU.
r;;;:/\
~
.~.
FI."r. 2. Capa cita .... d ."I"tlon " • •cc. ntrlclly
o f rod.
The cnpacitancl'. ( ', per IInit length
of n coaxial :lir ('apacilor il!i a ~ followl:l :
1.11·10
[. h
- r----;
--P I lIlC
(/ra )' - (.b)' ]
<:03h-' [ 1+
- 'lob
C
where the dillle n ~ iOIiS «, (" and t arc as
defined in Figure I.
The resolution of th(' l'a plU"itam·e·
dist:lIlcc mcnsurelll('nt ll.'t'hnique is in·
creased at le:lst a hund redfold if the
bridge is used to I'ornpur<' 1\\'fJ cap:u· j·
t:.tD('CS ruther than to IIWU,..IIrt.' thC' 1111·
known capacilulIl'C dirN·tly in t<'rlll" of
an internal standard . Th('frfor('. in the
actual mcaslLrt'Il)('1I1 , Ii !ittlndnrd rod is
first inserted :\s a refl'fI' IH'e, t he lin·
known is thell .suhstituted, and the
dilTcrence I)('\.wel'n the ('npacit.:u ll'l's is
meusure<.!. The briuge lIull d('tcetor,
caliLrated to indit'atc tlw d('\'iatiotl of
unknown from s lnntbnl ,Urectly, f'an
readily indicate deviations as sm:lll ns
one mill ionth of all illdl.
Of COUr.'il', 1\ 1It'\'ialiOIi ill clqJ:l("italice
(:auld he due to cIT('mril'ily of th\' "un·
known " rod as wdl as to :1 diffe rl'nce
in its 3YCn1ge diameter. TIll'rdorc, ill
the gmph ( Figure '2 ) showing the rela-
4
IET LABS, Inc in the GenRad tradition
534 Main Street, Westbury, NY 11590
www.ietlabs.com
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
FEBRUARY , 196 4
lion between ('apacit.ancc de\'intion and
(/e\'iulioll, Il. curve is :Hldcd to
show the equi\'a lcnL effrd. of eccen~
tricit.y, A1; the cu r ve 8hows, olle can
{,{'IIt.er till' rod in the jig by ndjll!';ting
till' roo for minimum c:lp:lI:it HlI ('~"
For tite high prf'ei!';ion r('quirf'd, it. is
nC('(''-'SHry to climillntl' the effects of thf'
leads frum the bridge I.(l the llllknown.
Tim". till' jig is ('Ollllcc led as fI thre('tt'l'millal capacitor, f\.nd is measured a:-;
such by lhe TH~: l(il.)~r\ Bridge.
The absolut{' nceurtlr.v of this mf'asurement d cprnds Oil Ihe uceum('Y of t he
standard 1'00, nod ~ with lolcrU lwes tiS
di~ull)('c
~
!;mull as ± IO microinchcs arc co mmer~
tinily a\'niluhle. The sellsi tivil.y of ('aP:H'it:lnee to chungf's ill distance is ill~
\'erscly pl"Oportiollul to the spacing between rod and jig. Deerellsing this spacing will ndd lcvcmgc to thc relution, in
the dirf'etioll of in('fCu:;ed pfl'f'isioll, A s
Ihl1 Sp:l l· ing is reduced , however, the
linl'a rity of lhe ca ptlcitance-d istan('c
relatiun is sucrifil'f'{1. The optimum
spae;ng therefore repre;;cnt.'i a co mpromise between &'tl;:.itivity nnd line~lTity,
S,~NDEnsoN
-
A, B.
-
I", \'.H;
V~t:'"
NEW, MEGOHM, WIRE-WOUND RESISTORS
AND DECADES
figu re 1. Ty p e 1432_1 Deca d e Ruilta, (,eo".
Ty p e 510,1'1 Ou a de R.. il ta nu Un it Oeft Fa,e",au."}.
Ty p e $00, Y Re.ISla. /,i"", fa,.",au~J},
The dc\'elopmcnl. of a new, fine-wire
resislor has made it possible to I'xt('nd to higher resistances
the range of our series of separat.ely
boxed, fixed resistors ( Tn'~; bOO), our
decudc-resistlulI"c units ( T\"I'~; 5 10), a nd
our multiple-decade-resistance boxes
I~megohm
(TYPE 1-1 32),
Separale 2-megohm, ft-mf'gohm, and
IO-megohm fixed unils are no\\' available thnt usc the appropriate number
of thc new rc",islors in series, The
decades usc len units to give a tota l of
10 megohms in I-megohm steps.
Like o ther Gn. resistors of 500 ohms
a nd higher, these ne \\" units a rc single5
IET LABS, Inc in the GenRad tradition
534 Main Street, Westbury, NY 11590
www.ietlabs.com
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
GE NE RA L
RADIO
EXPERIMENTER
winding techniques have made pra ct ical
the lise of O.;,-mil Enlllohm wire, which
makes pOl'f'iblc onl'-megohm units that
nre only slightly Inrgcr in size than those
of lo\\·er l"esistatH'c values. 1t is casy to
im:lgine thc diffictllt ics of winding wire
of th is "i;:e whcn one reulizes that it is
:\bollt J.f the diameter of human hair!
layer wound on a thin, card-typc form.
This type of r('~h;tor has lower indu e·
Lunce and .·upu('itancc than docs a
spool-wound re;;istor and , thcrefore, has
much better ae properties. lIigh-,·a lued
resistors of thi:.> type must usc vcry finc
wire if they are to ht, woulld on II form
of rCllSOllilulc 1;jze. HecenUy dcveloped
/
HUG HO\.ES'
NO
l
<~
P"<ll
0
'®'
:
i'§
!
.. -;>;
'"'"
FiV"" 2. D;m,,,,lo,.. of Ty p.
R.. i,lonc e Unit.
TYPE SOO RESISTORS
510
Ou od._
Fig "" 3. Di", . n.ions of Type 500 Rui llor.
SPECIFICATI ONS
Dimensionl: See ~kl:tc h.
Nel Weighl: 2 ounct'ij (60 gr:Uflg).
Shipping W . lllhl , S OU,, (·(~~ ( 2:10 gnIll18).
7'YIW
DC' 1l,.ii!:WJIIl"t"
' " II..L ('/I> re"i
2 ",egohm.
5 ",egohm.
10 mellohm.
SOO.y
SOO-I
500_II
1.1 rna
OJ ma
0.5 ",a
"c."nory
rQ(/" Xllmba
0.025%
0.025%
0.02 5%
0500-9725
0500·9726
OSOO-9504
DC He>li~t(Jl!c~
Toilli
Code
/'u Slrl'
0.7 ma
1 ",ellohm
•
~:..cll
'0 bo "",,"rI"~ ,,' ill 'rrmin.lio "" Iltin
(2.!J kg ); T I"JIC 1431-Z (3 ..1 kg ).
-
Dlme",lon., Width .. ~~ inches ( 11 0 mm ),
h('ilo:ht 414 ill,' IH'~ ( 1211 nun); length, 15 3:4" iJ1rht'~
(41MI mill) fo r '1'.\"1)(: 14:12-," illid 18 1 , inrh,'~
(,1741 mill) fur T .'"p(! InZ-".
14l2_Y
1432_I
Htlfi./rwu
Per Step
11,1 11.000 ohm.
1 1, 111, 100 oh ....
$98.00
,be
I<~'·''' nc~
!<in". R~.
Net W.ight, T YIJ(' 1·132-," -;- t.i pound". 5 UUIICCS
TYPE 1432 DECADE RESISTOR
To/l1/
95.00
Prire
Numb~r
05 10·9708
(Ieo.:ad~ i8 .,Ijuo'",t
i"cremento .. ~ ...,.,.".t~ 10 Ibi ••• ,"" tule,.noe.
.. I Ihe 10 _il\Q<, in ""ell
62.00
Dim. nslon", ~'C ~kctcb.
H. l W eillht: II OUIlCC~ (310 1o:r:1I11~ ) .
Shlppl nv W . 'ghl: 2 puunus ( loO kg).
TYPE S10-H
DECADE-RESISTANCE UNIT
~"t.an.,.,
Pri~
$11.00
Sh ipping W .ill ht : TY]I<' 14a2- Y - 7 pmmd~
(:1.2 kg); T y pe 1432-Z - !J pUllnd ~ (·1.1 kg ).
.\"(1. of
/) iol8
100 oh",s
\0 ohm.
i IJoOlmU8, S uunces
,
•
TYI,e510
nef"(IIlr~ ("~£"
('0>1£ ," lImber
D,E.F,G,H
U32·9725
1432-9726
C, 0, E, f , G, H
Price
$229 . 00
262 .00
6
IET LABS, Inc in the GenRad tradition
534 Main Street, Westbury, NY 11590
www.ietlabs.com
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
~
ffIUUO\R Y, 1964
-
FlO .... .
1.
IIj.II'O",
OSCILLOSCOPE
OSCll.U\TOR
8 10ck
.. f
'he
"' . o .... ' e"' .. .. '
,~,
'''''.''', . howl .. g
b ri" g .,
put .. "
hi ....... pply . .... "
.... iII .. .... p ••
MEASUREMENTS ON POWER TRANSISTORS
WITH THE TRANSFER-FUNCTION BRIDGE
-
The mcusurr'm('nt of the impcdtl ilces
!"Inri nth!'f <'hafa('\.(!ri;;lic's of transistors
Ilt vcry-higb Hnd ultra-high fn'l[ucncics
('un be carried out uml"f normul oper:lting mnditiolls with IIIf' T nE l007-A
Transfer-i"IlIwt ion und
Immillalwc
Dridgl'. With some powl'r transistor",
h(lwrvrr, t1w hent tl) br di;;;s.ipatcd
t'rCtl((·s a problem, hccallSt' it. is Hot
IIlwnys c'OlH'('nicnl to prov id!' fi hCI\t
siuk fu r thl' lruusisti)r while it is IX'ing
mCllsurcd.
At. our Imggf'stioll , a Ilumi)('r of URt'rs
of tin' hridg(' sol\'C'd HII' prnhll' m by
pubing tlw hiu~ i;u ppiy to t h!' trunsist/JI'. I)Nmilting higlwr pmwr 1(,\,(,11'1 to
hI" Ilsed withuut. ('xc·(':<!'.iw h('ltling. (l"c('
Figurl' I,)
Pu lsing prev('nt s t.he Ui><! of the nwter
illdkutioll of null bnlnnc'c on the THE
I:!Hi-.\ l ' nit 1-10' Amplilil'r, bcmllse M
thl' two difTNcnt impcdan ce s ta te;;,
bias-nff and hias-Q{l. TllI'rdorc, all
oS('iI\oscop(', (,OIlIlC('je<l to lhc vid<,o
output tl'rminuJs of the i-f a mplifier,
is U!wd us thc null indirfltor, and t.\w
null is lldjustcd at thc b in!5-oll portion
of the puisr,
Figurc :2 8ho\\'1) :t pulsed hias supply
fiS \I;;.cd hy Cl:u'k Division, Xatif)lltli
Rl'mil'ouducior C:orpomtion. Si milar
~' ir ru it !\ h:lvc I)('en USed by other rufHl ufucturcrs.
Trallf1istors ill the doubk-cllded stud
package, T O-a, or 1'0-8 pal'k:lg('~ for
l'sumple, l'UIi 1)1' IIl1'USlIrl'd hy U~(' of fhis
pub!' tf'C'hniCluf', We h:n'e rt'c'(J mrnended
that a G ~'Ill'ral nudio Type I()07- 1'201
t riode tuhc mUlIIlt be modified tf) ac('cpt these i:lrgN pllt'kag('s, In thc \'er;;.iull 111'<,(1 liy Clark, :l .Jcllron model
i-t-02() ,'l()('ket, was littcd into the t u be
rnOllllL after til(' tube !'.()~'kH was rl'moved. 'r he emiller lead was grounded
BIAS COfjN£CTlONS
ro
B~IDGE
Flgu r .. 2. Sc h . ", .. II,
pul te d kl l.... up ply,
.. f
..
7
IET LABS, Inc in the GenRad tradition
534 Main Street, Westbury, NY 11590
www.ietlabs.com
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
GENERAL
,, .r•
~ 4
., ,
•
,
-,
RADIO
EX'ERIMENTER
,
~~·'!o-':I)'OO_!
I,
!
,
zoo ...
...
-4
..
\7~
~
~, ,
-I
, .1., • • •I
~~
Flgur , . .
,
",
...
'00
I
'
V.. '60\( .. ' 100_
o
•w
"
~UIST4I<-CE
•• ,
""~
with n <,opper strap. T hc bn!<c nnd 1'01lrctor leads 11·('re brought OI·N to thc
normal ('"onnectiOIl!:\ within the ('ooxial
lill('.~ . .\ F('rroxf'ubt' (·hok(, <,oil (; n . :
200 10. :m ) wa~ nbo <,ollllr("led between
the bnM! lead and til£' f('cdthru ca pac'itor
~uppJied in the mount. This allowed
the conne("tioll of n O .;)-~f rupncitor
acro:;:, th(' ('xtcrnnl bias ('onllr('tionl'l on
til(' mount to s.top low-frt'qu(,llry 0scillation:;, \\hith mny oecur ut c('rtnin
l;('tting:-; of the bridge. In addition, t he
IC:ld~ from the emittN-b..'lse supply were
~
., ,
,~~
,:!
(H,It-~"PIJT
1IUO".ItC(
" "
OHM$-OIJTPVT
\
~~
...
\tM<
1\ 00"<
\J
,
\ 70".
kept as short ns po!'..<;;ible in order to
pJ"('I'rnt parasitic oJ;l'illntions.
T ypical r('suits for the Clark 100sefl£'S lmllsistors arc s hown in Figures
;j
lind!.
;>;OTE: W(, nrc' ind,'hll'd lu ~. \\'. I), .... k,un
'\ l ar11lKl'r,.-\PI)li('nli!Jn~ Divi._iun, ;>;nriunlll ~mi·
(·olltlUl'tn t;uq)(Jr;.lion, ("hrk Uivi.ion, rur
much of till' informatiun in tillS Hrlld.,.
- Editor
1
\II .... of 'h, r .. , .."y "mod.le d pro .. ' of '"g. S, o .. d 0 .. Guido B, loU ; a' "aua
tr ,n 'o I , Mitan , lIoly. Th, fI,m of 8 e rolll ho .... b u ... 01 .. ' . pu l , n'a""" for
G t .. .,ar Radio producl. i .. "o'y line, 1930, (... 11 Ih ...... Dr. Guld .. BI I.. II"
Gener a l Radio Compa ny
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IET LABS, Inc in the GenRad tradition
534 Main Street, Westbury, NY 11590
www.ietlabs.com
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
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