Sencore CB42 User Manual

Ff8. 63--Qrlionltioll point. of (uncr/oll; boord.
DVM
I. Switch DIGITAL READOUT SELECTOR to RF
WATI'S.
2. Connect frequency l:(Iunter to pin 8 of 1C5. Set
DVM Clock Cal (R923) for frequency of IlOOO H1,
± 20 H~
3. CQI'Ined neptive lead of e.r.l.emaJ ungrounded
adjlllltable IX: power supply lo DVM Refen'llce
(side of C904). and politive lead to DVM Input
(side or C904).
4. Monitonllll the adjustable IIUpply with a.I'l> DVM
8I,K"h as the Sencore DVM38. let the output to ap.
proxiIDlltely 1.4 VOC. Set DVM Cal IR9IS) for
Mme readi"l on m~_ mew and Clk2 ~I
Re.dout (ignorini decimal).
S. Reeet otelT\.ll supply fOf about 2!> mV, Ind let
DVM Lin Ift9IS) lor .. me rudin, on mer1!'noe
meto.r and CB42 J:li&ital RtadouL
6. Repeat .... and 5 until both li:niUl ohhe DiliUI
ftlo.dout all'"' with the ntam.l! meter.
NOTE: All n ... mb.... on
this board han I.
·"9OQ .. pnfi .... I. •.•
R923 is cho SI""
n R23.
""
DV.
rClock
fl
'
8
U R29 e4
n, -0-
UMod
11"
UPo ... ,
""'
.n
...
'"
2400 H&
.0'
i)
'D
'5O
...
1000H.
600H.
'[}
'[)
...
_OOHz
iI
.n
."
.. ,D
DV.
DV.
""'
CO.
00
1"0 ....
CO.
AUDIO AND RF WATTS
1. Set tbe DIGITAL READOlM' SELECTOR to
the AUDIO WATT'S poIition.
2. Set SPEAKER LOAD lwitch t.o the SPEAKER
position.
3. Feed 8 VRMS int.o lhe SPEAKER SUB.i.ek.
AdjUit the Power Cal control (R902) for. rMd..
inl of 1.00 Wattl on the DIGITAL READOUT.
4. Feed 2.82 VRMS int.o the SPEAKER SU8j1ock.
AdjUlt
Ponr Lin control (R906) for a readinc
of 1.00 Watta on the DIGlT .... L READOUT.
5. Rf'~t SUOpl 3 and. until pown function ~dl
colTl!'Ctly at both ealibntio!l polnu.
6. Feed 2.82 VRMS inl.O the SPEAKER SUBjoIclr..
Prea SfN CHECK buUOn. DIGITAL READOUT
should raod 10.00 Watuli.r. Wath).
Feed 3.00 WaUl RF int.o the 500 Ohm input. Select
RF POWER on the DIGITAL RE .... DOUT SEL.
ECTOR..... djust RF power Cal (RlO(2) thfOUih trnall
hole in bottom of 50 Ohm Loed shield for a power
madinlOf 3.00 With.
PERCENT MODULATION
2.
Set DIGITAL READOUT SELEX::TOR t.o POSI.
1. Feed .500VRMS 1 KHz wilba_l.414 VDCoUaet
TlVE M<;mULATlON potiijon.
between the top and bottom feed-thfOUCh CIpI- ,.
Adiu-t '-' MOD Cal (Rm) for 60% readOl.lL
ot.on on the 50 Ohm load Ihield. The t.op feed·
••
Set DIGITAL READ01.JT SELECroR to NEGA-
throulh iI ·1.414 VDC and the bottom feed-
TIVE MODULATION poUlton. R.adinl.hould be
through DVM reference.
r.O'I. ± 2'1>.
RF·IF OUTPUT
L
Connect RF voltmeter terminated in ~ Ohma to tion. and adjuat IF Level control (R21l) for lOOK
RY.IF OUTPUT. \IV on RF Voltmeter.
2.
Set MICROVOLTS OUTPUT controll f/)l" lOOK
,.
Repeat ltePl' 3 and'" unt.ilthe ... me readillll ia ob-
\IV OOlpYL
tained in both poIIitiorw.
3. With HF·IF FUNCTION Switch Illt to AM. adjuat
,.
Settoo IF 1tJNING control for mulm\lm frequen-
27 Mlh control (R212\ for lOOK \IV on RF
cy on the 6·12 MHz ~ition of the RIl_IF PUNC-
Voltmeter.
TION IJWiteh.
••
Set RF·IF FUNCTION !witeh to 6·12 MHz poei-
7.
Connect I 50 Ohm termilU.ted freq\lency oountar to
50

Sencore CB42 Specifications

General

Brand	Sencore
Model	CB42
Category	Measuring Instruments
Language	English