Dynascan B&K 290 User manual

;.1t,::,
i$
;::{
"'ii
ir+
iii=-€
iis

Deqr Friend:
Congrotulqtions on your purchose of B d K-Precision
Test Equipment, qnd welcome to the B & K Icnnily. We
hope your experience with your new test equipment
will mcke you q lifetime B d K customer.
Your instrument is bocked by more thqn 20 yeors of
experience in designing and mqnufocturing. Our most
importcnt gool is your sqtisfqction. At B & K, test
equipment is mqde to meet the demqnds of the field focusing on dependcbility
qnd qccurqcy. We also concentrqte on simplicity crnd operoting ecse with
feqtures thqt reduce the possibility of humqn error crnd speed the servicing
Process.
In order to determine the type of test units thqt cre needed we hqve been
guided by letters qnd reports from techniciqns ond engineers who use the
equipment doily. Our field tests qnd studies hove helped provide better qnd
Icster service techniques. Close contqct hqs been mqintqined with the mqnu-
facturers of consumer products which our test units will be checking ond
trouble-shooting.
Key personnel in our company cut their eye teeth in the TV service business.
This is why we hqve more "sensitivity" for the problems qnd conditions under
which the test eguipment will be used.
B & K product desigrnscrre constantly reviewed, qnd refinements qre mode
or new models developed to meet crdvqnces in our industry ond to fill your
needs. We set our stqndqrds high so you can be cssured that the B & K test
inskuments you buy represent qdvqnced design, quclity conshuction, crnd
dependcble long-term performonce qt a price you con cfford.
If you hqve qny comments or thoughts qbout our products, or test equipment
in generol, I would be delighted to heqr from you.
Thqnks for your confidence in B d K ond we look forwqrd to serving you for
c long time to come.
Sincerely,
CqrI Korn
President

gI9O9 sloug1g
6otecgql
enueav eurald elleg rsaa I08I
,vorrvuoduot
NvfsvN.{oJo Norsf^ro
)| ? I
UflTgil[IJTIIIN f,
II[OU'tfgTfl
flJVJ,S-OITOS
ogJvugdo-JY
'goNIYu-ogot{IJXg
067,Iepoill
uo.{
TYITNIYRINIOIJ,f,
IIUTSNII

TABLE OF CONTENTS
Page
GENERALDESCRIPTION
AND SPECIALFEATIJRES ...... 3
SPECIFICATIONS
OPERATING
CONTROLS
OPERATINGTHEMODEL29O. .,...6
SafetyPrecautions... 6
PreparationforMaking
Meazurements 7
MeasuringDCVoltages... .....7
7*ro Center DCVoltages 7
MeasuringACVoltages... 7
dBMeasurements 8
MeasuringResistances... .....10
MeasuringACCurrent.
. . . . . . . 12
MeasuringDCCurrent.... ....13
MeazuringDCCurrentsbelow
50mA . . . . . 13
CALIBRATION
ANDMAINTENANCE .....14
CIRCI]IT
DESCRIPTION. ..17
WARRANITYSERVICE
INSTRUCTIONS ....19
WARRANTY ....20
3
6

t
'4109 @
gp 0? uBqt
lalteg
'sotuur
A00SI pue A00S
uo%S+
'zHog
@
epcs
wv%E+
AosI re^ozH)t07,otzHs
'8p€+
AosI ot
4p[0sl,
olzHs'gp€
+
AosI ol 4{)t00s
ot4t}e'gps'T
'(eqor6
IZ-Ud,r{1!r\
ldOtt)'s>1cef
tndul
l? JdIt fleluu4xordde
fq pelunrpsuqotery 6'71
'elsrs
IInJA00?tpu? A00tI 'L}w
'A0tI 'LW 'Lll ' /.s,''l'At'I 'Aurott 'Autotl
'elBcs
IInJA00sI pu? A00s
'A0SI'A0g'ASI 'AS 'AS'I 'AurgoS611110SI'Arrr09
'aEuuqc
fcerncce
ob7+
roJ
zH
09@
gp9t u?rgrellag
'aqord
ut
rolslsertutlulost
X00I Eupnlcul
%9l+ 'sruqota;41
91
'elBcs
ilnI%9'l+
'epcs
IInJA00sI pu?
A00s
'A0SI
'A0S'ASI'AS
'AS'I 'ArII00g
(AuCISI
'AIII0S
:uoqcafegepon uoturuoJ
:fcernccy
:asuodseg
{cuenberg
:acuzpadutl
1ndu1
:satuua
{Bad-ol-)t?ad
0
I
:satuqg
SIN 0I
:SI'IOA JV
:uoqcefaA
opon
IBuroN
:ocu?lslseg
1ndu1
:dcernccy
:satuug
g1
:sI'IOn C(I
SNOIIVJI.{ISIIdS
'slueureJns?etu
lc?xeEug4utuJoJelucs
peJoJrnuqlu$ Jeleru puar-o1-r{sug
o
'sluetuela
llncrlo reqlo pus s3IgC 'relatu ol sp?olra^o plueprccu ruo{ uollcelord o
'uoneredo
olqe$
?r1ln roJ segddns ranod peluptor q11n (sepen?q ou) uollerado 3y gng o
'llncrlt Jelno ro ur'cle's.UCS 'srolqsuerl's.JI Eurlsel
roJ ro secuulslser
tuunseau JoJslsel suqo a8zllorr
FrrrJou pue atellol t\o'I .
'(apcs reluecuqo euo) etuer suqo ecu?lsrsar
nol pcadg o
'sllo^ J11
pu? CVqlog uo flnrtnues eprs-[nJ stlo^!rutu0S o
'Ewpeollrncrrc tununurtuJoJslueuoJnseor,u
eEqlo,r CC pu? CV qroq uo (surqotaru SI) ecuupedrur 1ndu1 qtIH o
:apqJul sernlseJ u.ntusll
'ss1{qqoq
pue sreaudua 'sraen Flr1snpq 'suercruqcel ,ecraresAI pue oIpBJ roJ pelps
,(Fapl roleurylnp cluo4celg tndq IlId e1?$p11os
e q 062 lapo1 11T g eql
sflumvgd "IvISiIdsotlv NolldruJsgo TvugNgc

OHMSMEASI,JREMENT:
8LnwVoltage
Ranges RXO.I, RXl, RXl0, RXl00, RXIK, RXI0K,
(33mV): RX100K,
ru(lM.
7NormalVoltage
Ranges RXl, RX10, RX100,RXIK, RX10K, RXI0OK,
(1.25V): RxlM.
Midscale
Reading: l0 (timesmultiplier)
Accuracy: t3oofarc,
(+4"ofarconRX0.1
and
RXIM ranges). '
DC CURRENT:
10Ranges 50pA,
l50pA,5001rA,
l.SmA,
5mA,l5mA, 50mA,
150mA,500mA
and1.5
Amp
fullscale.
Accuracy: !37ofull scale;
+
4%on1.5
AmpRange.
InternalVoltage
Drop: 50mV
atinstrument
inputterminals,
to 50mArange.
AC CURRENT:
10
Ranges: 50pA,l50pA, 500pA,
l.smA, smA,l5mA,50mA,
lsOmA,50OmA,
and
1.5Ampfullscale.
Accuracy: !4% full scale
@6011z,,
lsvo on 50pA
and1.5
unp
ranges.
Internal
Voltage
Drop: 50mV,
at
instrument
inputterminals,
to 50mA
range.
Frequency
Response: +.5d8,
20llzto 5kHz,
50ouA
to l5&nA ranges.
+3d8,
TlIzto l6kHz,
500uA
to l50mA
ranges.
DECTBEL
(dB):
l0 Ranges:
Accuracy:
Reference:
RESISTORS:
Multipliers:
-40 to+66.
!3Vo
offullscale.
lmWinto
600ohms.
(.775V]_
trLVo
Precision
Type
- Frequency{ompensated.
Current
Shunts: l%Precision
TYPe
Ohms
Shunts
:ZVoPrecision
Type
METER: 7",l001rA,!2Vo,100".
DCzero
center
scale.
Mirrored
scale.

stortuo3 Eqtoredg '1 ero6;1
'sqtt
lvv
'c ..8/s-g
x'A\..9
x'H,,vlvL
'slteA\
6.8:2H09/OS,CVA
SZI
_ S0I
soporq
rcue7 (7)
srerJrtrcoU
uoclyg (y)
'sopor6
uoclpg (7)
'soporq
runrueruro
g (Z)
'IolslsuerJ,
roirod /\{oT
NdN (I)
'rolsrsuerl pUEIS
NdN (I)
'rolsrsuellIBnC
NdN (I)
'JiId touueqJ-N
len11
(I)
'BSCVS'dtuu
91/1 :esn;
eurl
ro^\od
'sde8
ryeds
fq uorlcelorde8ellonq8lg
'(durV SZ'I) asn;
,{quorlcelordpuolre^o
}rncrrJ
'sp?olre^o
tuorJ opop ,{q pelcelord lndur lgg pue re}ew
:IHCIIIA\
:SNOISNgI^IIO
:sINgI lgulnogu uirA\od
:SUOJJNCNOJII^IgS
:NOIIJgIOUd

OPERATING CONTROLS
This ElectronicMultimeter is assimple to operateasaconventional
WVM. The
following is a brief description
of eachcontrol andhow it is used
(refer to Figure
1).
l. METER ZERO ADJUST (MECHANICAL): The mechanicalmeter zero
adjustment must be made before the instrument is turned on. Insert a
screwdriver
(preferably
non-metallic)
into the slotlocated
in thecenter
of the
front panel immediately below the meter face.While gently tappingmeter,
veryslowlyturn themechanical
zeroadjustuntil thepointer restsat zero.
2. FI,JNCTION
SWITCH: Usedto selectthe desired
function for the measure-
mentsto beperformed.
3. RANGE SWITCH: Usedto selectthe desired
rangeof current, voltage, or
resistance
to bemeasured.
4. OFF-ON SWITCHAND ZERO CONTROL: To turn the meter on, pull the
ZERO control shaft
outward.
Theredlampon themeterwill glow,indicating
the meter is ON. Rotate the ZERO control to position the pointer of the
meter at zeroon themeterscale
or to positionthepointer on thezerocenter
when usingthis feature.Push the ZERO control shaft in to turn the meter
OFF.
5. OHMS CONTROL: The OHMS control is adjustedwith the FUNCTION
switch in oneof theOHMS
positions
and
with thetestleadsopen. Rotatethe
OHMScontrol for afull scale
indication, infinity (oo)
on the ohmsscale of the
meter.
6. PROBE SWITCH: This instrument is equippedwith a strieldedtest leadto
allow accurate
AC measurementsin the presence
of strong
electrical
fields.
Whenthe switch is in the 100Kposition,a l00K resistor
isswitched in series
with the test lead. This isolatesthe cablecapacityfrom the circuit under test
when makingDC voltage
measurements
in RF, IF or sweepcircuits. Setthe
probe switch to the DIRECT position for all measurements
other than DC
voltage.
7. ADJUSTABLE HANDLE: The carryinghandle
may be used
to supportthe
instrument in a convenientslopingposition for easy
viewing.The casealso
canbeplaced in eitheraverticalor horizontalposition.
OPERATING THE MODEL 290
SAFETY PRECAUTIONS
A certain amount of danger
is always
present
when working on
electricalequipment and therefore,the user
is cautionedto always
familiarize himself as much as possiblewith the equipment to be
tested,
beforeanywork isperformed. It shouldbekept in mind that
high voltages often appear at unexpected points in defective
equipment.

L
.)00I ol qctlr\s.Il8oud er{l
les .c
'(apcs ruoiloq aql) >1reu
onz lcluec or{l
re^o slserralurod raletu eql illun esl/rr>lcolJ
qoq Iorluoc OUSZ er$ alslou 'q
'raqta8ol sp?e[
1set
oql iloqs pue A aKI+ ol qctl/r\s
NOIIJN1g oql tes 'B
:sgcvrlo^ co uilrNgcoullz '€
'f1e41cedsar
sa8uer
ltor gggl puuA0SI
'ng1 'nurg5l oqlroJ000I pu?00I '0I 'I' [q paudrllnu pw atuerltoa g'1
eql roJ{1canp peersI aTecs
llo^ S'I or 0 aql 'l(1a,r11cadser
satuurA00g puu
A0S'AS'Arrr09 erp
roJ
000I pu?
00I '0I 'I' fq peqdpptu sl puu'aEuur
11o,r
S'eql ro; fllcarlp peer
sIelucs
tlorrg' ol 0 eql'satuer ltort
gggl pu?ngSI
'ASI'AS'I'AUIOSI eql roJpesn
s! epcsC( puoces aql'se8uer llo1 00S
pu?A0S'ng'nu4rg5'Aurgg eqtqt!$ pasn
sr
eprs CCdo1 aqg 'relatu orll uo
alucs
perorrlru orTleloqu 1sn[
sapcs)tc?lq o^$ eqt uo p?er s1 aEellol JO eql 'E
'fitre1od tcerroc eql ol qcl!^\s NOIIJNqC eqt
las'lJel eql ol sloegep
ralurod raleu eql JI iSulpuar
tueunrtsw eqt o^resgg 'J
'perns?au
oqol lwod eql
qllt\ lc?luoc u d$ aqord oqt tuFS 'lsol roPunllncrtq eIDJo lulod ecuareJer
ro punort o1 {quass? pBeI
lsat aq} Jo p?el (e,r11eEau)
{cEq eql lcouuoC 'e
'ostrr\>lcolc
fgq gc11,ts
1ICNVU eql les'a3e11o,r
ufi\ou>lunuu twrnseeu uaq/[ 'p
'epcs VyVSI'IOA uo {r?lu orazeql JaAoslsarralurod
roleu ulun lorluo, ougz el?lor pu? pr?A\}nouBrls lorluoc ougz eql IInd 'c
)00I ot qcty$ ggoud erllles .q
uoEurDuadap
.uor11sod
Aro+
ro
"til:'#;1fi"::tffi#ili:t:ffnT '
:SgCVI'IOA JC CNIUNSVflI^I 'Z
'lBuItuJel
(+) par oW q s1tnld oql Jo urd (+) arrplsodeql luql osselculdecer pulrurel
rotau oql olur flquasse peal $ol eq] Jo tnld eueueq alqnop eql uesq 'q
'(SfOU1NOJ CNIIVU1IdO lepun peupldxa
se'pcrueqcau) 6nfpe orazreleu eql le6or
'otez JJost ralurod er{l JI 'el?cs
eql Jo opls
Uel eql uo 4r?ru orez eql re^o slserrelurod relotu eql l?ql aes
ol
)tcaqc
'(uoppod JdO eql ur ralaur)u1
paqsndqoq lorluoc OUflZ eql qg1ye
:SIN!II{gUNSVgW CNUVI^[ UOC NOIIVUVdTUd 'I
.ANI'I U!IA\Od J-V IIHI dO IICIS IINO OI CgII SISSVHJ
IIHI CNIAVI{ rNily[dnog Nt OflSn ilg SAVAfM'InOHS
uflI p1gdsNvlil NOIIV'IOSI NV 'sp?al 1sa1
Eullcauuoc eroJeq
rarnodEullerado
eaoruerol q actlcerd
pooEV 'qrud runler punor3
z aprrrord plnoc rIJIr{/{tslcafqo {qreau Eurlcetuoc pIo^B ol InJer?o
{pelncpred ag 'slueuernsuaur Euprel olq,tr uo pu?ls o1 Suuo,roc
roog ro roog pelelnsu fpadord ? e^Br{ol lrrulrodury osp sr lI
'ryorls lulueplrc? Jopr?zurl
eql e4urlqtu ot 1a4cod
rnof q pu?q euo
Euldae>1
Jo Uq?gaql dolaaep'slrncrc atellol qErqtu4sel uar111

d. Set the RANGE selectorswitch fully clockwise andconnectthe test leads
to
the circuit the sameas
for DC voltage
measurement.
e. Observethe meter pointer indication on the black scalemarked "O" and
rotate the RANGE switch counterclockwise to obtain the best useable
meter deflection. Positivevoltages
will make the pointer deflect to the right
of the center zero mark. Each side of the scalelepresentsone-half of the
range
being
used.For example,
whenthe .5volt range
isbeingused,
each
half r
of the scalerepresents
.25volt andeach
division.01volt. Thepurpose
for the
center zero scale
is to indicate a balanced
condition. For example,if this
instrument is used in the alignment of an FM discriminator, the desired
balanced
condition will resultin areading
of zeroon themeter.
A misaligned
condition will cause some deflection in either the positive or negative
direction.
4. MEASURING AC VOLTAGES (RIvlS & P-P):
NOTE
Effect of waveform in measuringAC voltages:
This instrument
employs a peak-to-peak
type detector, and is calibrated using a
sinusoidalsignal.The scale
is calibrated to give RMSreadings,
using
effective values basedon a true sinewave.When it is known that
other than sinusoidal
signals
are beingused,
it must be recognized
that the accuracy as specified for sinusoidal waveforms will not
apply. However,peak-to-peak
values
will remainaccurateusingthe
peak-to-peak
scaleson themeter.
a. Setthe FUNCTION switch to the AC V position.
b. SetthePROBE
switchto DIRECT.
c. Setthe RANGE switch to the desired
position. If the voltageis not known,
setRANGE switch fully clockwise.
d. Short test leads
together
and rotate ZERO control until meterpointer rests
over
zeromarkon VOLTS/MA scale.
e. Connect the black (negative)lead of the test lead assemblyto the chassisor
reference
point of thecircuitundertest.
f. Bring the tip of the probe in contact with the point in the circuit wherethe
voltage
isto bemeasured.
g. Observe
the meterindication. RMS voltage
is readon the two redscales
just 6
below the mirrored scaleon the meter.
To measure
peak-to-peak
voltage,
the
two red scalesmarked VOLTS P-P
areused.
The scale readings
aremultiplied
by the same
multiplier factors as
wereused
in DC voltagemeasurements. '1
s. dB MEASUREMENTS:
The dB scale
(-10dB to +6dB) for measuring
output level is calibrated
according to the standard of lmW into 600 ohms and direct scalereadings