Krohn-Hite 3550 Assembly Instructions

SOLID STATE
VARIABLE FILT ER
MODEL 3550
SERIAL NO. __
OPER AT I G AND AINT NANCE
MA NUAL
KRD
- ITE CD R PCRAT ID
Avon Industrial Park/Bodwell St., Avon, Massachusetts 02322
CD 1975 KROHN- HITE CORPORATION

Con t en
ts
CONTENTS
Se c ti on
1
GE NE RAL D ESCRI PT IO N . . . . . . . . .
2 O P E R A T ING I
STRUCTIONS . . • . . ..
3 IN
COMING AC CEPTANCE AND INSPEC T IO N
4
CIRCU IT DES CRIPT IO N . . . • .
5
MAINTEN A NC E ....•..
6 CA L
IB R AT ION AN D ADJ US T M E N T
ILLUSTRATIONS
F igure
1-1 M o de l 35 50 M u lt if u nc ti o n F i l te r .
2-1 F r ont and Rea r Pa ne ls .
2-2 Pas s Ban d C ha r a c te r i s t ic s .
2- 3 Normalized At tenuati on C ha r a te r is tic s
2- 4 Squa re Wa ve Response .. ' . ....
2- 5 P ha s e Shif t . . . . • •e •
4 -] loc k Diagram . . • • . . . . .'
4 - 2 R e s po ns e
of Q ua d r a t ic A mplifie r s •
5 -1
Trim s and A dj u st m e nts . ..
Appendi x
S c h e m a
ti • Layout a nd P a r ts L is t
TABLES
Table
3 - ] Acc e ptan c e Che ck out P r
oc ed u r
5- ]
Te s t P oint v s S igna l Volt ag e
6- 1
Ca l ib r ati on P ro c ed u r e . . . .
P a g e
I
4
I I
15
20
24
P a g e
ii
5
8
8
8
9
16
17
21
~
E nd
Pa g e
12
22
26

F i lt er, 3 55 0
. 1 . 10 ,100
.IK
INPUT
I<ROH -HITE
mo de. 3550 filter
F ig u r e 1-1, Model 3550
Multifunction Filter
ii

Se ctio n I - General D escripti on
SECTION 1
GENERAL DESCRIPTION
1.1 INTRODUCTION
T h e K r oh n - Hi te Mo de l 3550 , shown i n F igu re 1- 1, is a mu lti func tion filte r
that ope r a te s in a h igh -pa ss , lo w -pass , band -pass , or band -reject mode .
The c ut off frequencie s a r e independentl y a dj u s ta bl e bet ween 2 H z an d 2 0 0kHz .
A n
optional rack -m ounting kit (P a r t No . RK - 38) is a vailabl e f r om Kr oh n -H ite
(or install ing th e Model 3550 in a standard 19" r a c k spacing .
1.2 ELECTRICAL SPECIFICATIONS
Function
L ow -pas s , h igh - pa s s , b an d -p a s s , band- reject.
Cutoff F requenc y Range
BAND
M UL T IP L IE R F
RE QUE NC Y (Hz )
I O. 1 2 - 20
2 I 20 - 200
3 10 20 0
-200 0
4
5 l Oa
lK
2,
000 -20 , 000
20, 000 - 200, 000 \
F requenc y Can1 ,01
L ow - pa s s and high-pass functions ea ch have one decade dial and a 5- position multi -
p
li e r s wi tch , e ff e c t ivel y a 30 i nch lo ng scale fo r the 5 fr eq uen cy band s .
Cutoff Frequency Cal ibrc tion Accu 'a cy
±50/0 bands 1 t h r u 4, ±lO% band 5 with RESPONS E s wi tch in MA X F LA T (B ut t e r wo r th)
pos i tio n ; l e s s a c c u r a te in L OW 0 p ositi on . Re la tiv e to m id- ba nd l ev el, the f il t er
output i s do wn 3d B a t cu t o ff in MA X F LAT po sition a nd app roximate l y .1 2. d B in
L OW 0 pos i
ti o n.
Bandwidth
Lo w -Pass Mode : F ro m a pproximate ly 0 .2 Hz to c u to ff setting b et we e n 2. °H z to
200 kHz ,

Filter , 3550
Hig h -Pass Mod e : F r o m cu toff s e tt ing of 2. 0 Hz to 2 00 k Hz , to ap p ro x ima t el y
3 MH
z.
Ban d-Pass: Bot h cut offs a djustabl e fro m 2 . 0 Hz t o 2 00 k Hz , F o r m in im um ba nd -
wid t h
(Butt e rwo rth response ) both c ut o ff fr equencies a r e s e t to c o in c id e . Th is
p r
oduce s an inse rt i on loss of 6 dB , with the 3dB po int s a t 0 .8 an d] . 25 time s the
mid-ban d frequ e nc y.
Ban d-Reject: Bot h cutoff f r e qu e nci es adj us ta b le fr om 2. 0 Hz to 20 0 k Hz . Lower
pass band to ap p r o ximatel y 0. 2 Hz, upper passband to app r o ximatel y 3 MHz . A
sh a rp n ul l can be ob ta ined b y s etting th e Hig h Pa ss s e ct ion to about t wice the null
fr eq ue n c y, and the L ow P a s s s e ct i on to half the null fr e quen cy, and a l te r n at el y a d-
justin g both d i al s fo r minim um r e s pon s e .
Response Charocteristi cs
Choice of 4 pol e Butt e rwo r th (Maxi mally fi a t res pon s e) fo r fr e que nc y d om a in op e r a -
tion and L ow Q (da m ped res p on se) f or tr a n s i ent - fr e e ti m e dom ai n operati on,
selected by mean!') of a switch on the rear pa ne l.
Attenuation Slope
Nominal 24 dB per o ct av e In all rn od e s of o pe r a ti on .
Pa$S Band Gain
Zero db +1 db in pass band.
Maxi mum Attenuat ian
Great er than 60 dB
Input Character; stic 5
Max Volta g e : ±7V peak to 2 MHz.
Max DC Component: ±lOOV.
Input Irnped anc e : 10 Megohms in parallel wit h 50 pi.
Output Characteri 51iC5
Max Volta ge : ±7V peak to 2 MHz.
Ma x Current: ± 15 rna peak.
Internal Imp ed an c e : 50 ohms.
Hum lind Hoi se
Less than 200 uv , except 400 uv in "BAN D RE JECT" rn od e ,
2

Section 1 - General De sc ript ion
Output DC Le ve l Stobi I ity
± l m y / oC t ± l rnv Zhr . Som e what g r e ater in BR m ode .
Front Panel Control s
High Pass Sectio n : Hz d ia l a nd m ultip l i e r sw it c h.
Low Pass Sectio n : Hz d i al and multip lie r s w it c h .
Function Switch : LP, HP , BP, E R.
P owe r
ON Switch
Reor Ponel Control s
Re s p on s e Switc h : M AX FLAT , LOW Q.
Gr o un d Switch : C HASSIS, FLO A TI NG .
DC L e v e l: P
ot entio m et er.
L in e S wi t ch : 115V /230V.
Terminals
F ro nt an d r e ar pa n el s , one E NC con ne cto r fo r IN P U T, one for OU TP UT. AC power
r e c ept a cl e w it h d et acha b l e l in e co rd . On e r ea r ter mi na l for ch a ssi s g r ou n di ng .
POWIIT Henuirernants
105-125 or 210-250 volts, sin gle phase, 50-400 Hz, 10 watts.
Operating Temperature Range
occ to 50aC .
Dimensions and Weights
Mo de l
Ov er a ll D im e n s io n s We i
ht
Widt h
Height
Dept h Ne t S
hip p ing
355 0 8 1/ 2" 3 1/ 2" 13 " 9
Ib/4kg
14 Ib / 7kg
3

F i lt e r , 3550
SECTION 2
OPE RA TI NG INSI CIIONS
2.1 INITIAL SETUP
T he fi lt e r is ad jus te d and checked ca r ef ul l y in our test department to insure t ha t it
mee t s al l specifications . It is then age d and teste d aga in bef o re shipmen t. The
filter is shi pped complete and afte r un pa ck in g is read y for use.
Th e M od el 3550 s ho ul d be unpacked ca r ef ul l y and in s pe ct ed f or damag e tha t ma y
ha
ve oc c u rr ed in s hipping . Check all controls for freedom of ope ration .
T
he Filte r may be op er at ed f rom an A C powe r s ou rc e of e ithe r 10 5- 125 vo lt s ,
50 - 4 00 H z ,
or 2 10 - 250 vo lt s , 50 - 4 00 H z . A I1 5 / 2 30 V LI NE wi t c h, l oc at ed on th e
r e
ar pa n el , s e le ct s t he filt er' s mode of ope r at io n, Wh en t he AC line i s 115 V, m o ve
t he LIN E s wit c h to the I 15V po si tio n . In t hi s mod e , a 1/ 8 ampe r e 5 10- b lo fu s e ITlUS t
b e u s e d . Whe n th e
fi lte r is to be op e r a ted f rom 230 V AC , m ov e t he L I NE s wi tc h to
t
he 2 30V po sit io n, and r e pla c e t he fu s e w it h a 1/ 16 am pe r e slo -bl o typ e .
2.2 CONTROLS AND TERMINALS (figure 2-2)
2.2.1 Fro" I Ponel
T he fun c tio n s witch in the top center of th e front panel selects on e of fou r fi ltering
f un ct ion s : L ow P a s s (L P ), Hig h P a s s (H P ), Band P as s (B P), o r B a nd R e je c t (BR ).
4

g
FRONT VIEW REAR VIEW
FIGURE
2-2. FRONT AND REAR PANE LS
CD POWER SWITCH (ON IO FF )
® INDICATOR LI GHT
@INPUT CONNECTOR (BNC TYPE)
®OUTPUT CONNECTOR (BNC TYPE)
®MULTIPLIER SWITCH (HIGH PASS)
®MULTIP LIER SW IT CH (LOW PASS)
oFREQUENCY DIAL (L OW CUTOFF)
®FREQUENCY DIA L (HIGH CUTOFF)
® 115 / 23 0V LI NE SWITCH
® OUTP UT CONNECTOR (BNC TY PE)
@ INPUT CONN ECTOR (BNC TYPE)
@
I/ BA SLO- BLO !lT V
12 FUSE 1/ 16A SLO-BLO 23 4V
@POWER RECEPTACLE
@CHASSIS GROUND CONNECTOR (BINDING POST)
@GROUND SWITCH (FLOATING I CHASSIS)
@ RESPONSE SWITCH (MAX FLAT I LOW 0)
@ DC LEVEL POTENTIOMETER
@ FUNCTION SWITCH (LP, HP, BPt BR)
F igur e 2 - 2. F ro nt and Rea r Pan e ls
:.n
(1)
('l
,...
... .
o
...
N
o
v
l't>
-t
PJ
...
... .
::J
()Q
5'
til
...
....
c
('l
...
....
o
::l
t1l
VI

F ilter , 355 0
The cuto ff frequencies are se t by d ia l s and rn ul t i pl ie r s w it c he s, o ne fUI' the Hig h
P a s s a nd o
ne fo r the LLl\\ Pass s e c io n s.
T he p owe r O N sw i tch and indicato r li g ht in the l owe r cen ter comp lete th e fr on t pane l
c on t r o l s .
B NC C
on n ec tors fo r INPUT and OUTPUT a re loc at ed in I he l ow e r co rners .
2.2.2 Rear Panel
The R ESP O SE s wi tc h provides cho ice be twee n MAX FL AT and LO\ .\,' 0 r e sp on s e of
t he Model 3 5 50 . T he G R OU. ' D sw it c h, r e ce s s ed in the r e ar panel t o p r e v en t in -
ad ver tent oper ati on , conn ec ts the ch ass is to ci rcuit g rou nd in t ne CHAS SIS pos it ion
and disc onne cts them in F LOA TI G . T he DC L E V EL mu l ti tu r n s c r ewd ri ve r - ad -
ju
stabl e potentiomet er p ermits se ttin g of th e ou tpu t DC l ev el. T he LINE s wi tc h
s
elect s 115 V r 230 V A C ope ra t ion .
The IN P U T a nd OUT P UT BNC co nne c to r s a gain oc cup y t he c o r ne r s a nd th e CHASSI S
bingin g po st p rovides m eans for groundin g the chassis .
A
fuse holder l ab e l e d wit h th e r equ ir ed fus e ratin g , is a lso mount ed on the l' a r
pan e l.
2.3 OPERATING PROCEDURE
2.3.1 Conn ect t he Mod el 35 50 to th e power line.
2.3.2 Ma ke c onne ct i on s t o the INP UT and O UT P U T.
2.3.3 Set the fun c ti on s wi tch to th e d e s i r e d m od e a nd th e High P a s s and Low Pa s s
section cont ro l s to the r e qui r ed fr e q uen cy ran ge s.
2.3.4 T u r n ON pu \'. ,'er.
NOTE
If the in put s ig na l exceeds the m ax im um
sp e c i fied lev el s ( 7v pe a k, ± IOO vdc ) or if
the o ut pu t c u r r e nt ex c ee d s ±15m A pea
cl ipp ing w ill oc cu r .
2.4 SPECIAL FUNCTIONS
2.4.1 Narrow Bon dposs
Nar r o we s t pass ban d in the ba nd - pa s s mod e is o bt a ined by s e tt in g bot h c uto ff fre-
quen ci e s eq u al a s s ho wn in figu r e 2-2, cu r ve C. T he r e s ul t ing in s e r tion los s is
6