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the station engineer 'tlith a r&cord of the actual voltage read·-
ings in his installation, using his !l1eter.
If trouble lat&r
develops, he will then b& bettor able to judge 'tlhoth0r or not
a particular circuit is operating properly since h& vTi11 have
available a record of the various readings of his parti.cular
equipnent.
DC readings were taken. with a
20,000
ohIa/vo1t Deter
as indi.cated on the scheDatic.
R!1S signal voltages are sho1,/n
in pare.nthesis and Dust bG neasured with a vacuwa tube volt··
Deter. If a
VTVM
is used to measure DC voltages, sli.ghtly hit;hor
readings may be obtained.
The channel Dixers are step type low inpedance attenuators.
If sealed types are used, they require no maintenance.
If
unsealed types are used, th&y require cleaning about four
tines a year in the average location.
A well air conditionGd
rooUl 'tlOuld allow longer pGriods between cleaning theD.
A very
dusty location would require Do:ce fr·equent cleaning.
The at···
tenuator contacts should be cleaned and lubricated by using
Davenol (sometines called Daven oil).
A soft, lint-·free cloth
should be used to renove the dirty accwaulation fran the COIl-'
tact surfaces.
Davenol is inexpensive and Day be p'lrchased
fron the Gates fb.dio Conpany.
The relays, and the cha=ol lever keys, wero selected. for long···
life and trouble- free service.
The contacts ,u'e s&li'-wiping
and everyday use viill keep these contacts burnished.
The con··
tacts on the keys and relays that receive infrequent use can
be cleaned by opere.ting the cguipncmt sev3ral tiDes, thus,
periodic operation
OI~
unused equi.pwent will keep the contacts
clean.
In case of stubborn trouble, use a contact burnishing
tool (Gates
Tl'1~1).
AbrCl.sive papers, files and grease solvents
should. never be used on these contacts.
Grease or oil should
not be used on relay or key contilcts.
This would nake theUl
collect dust, get gunny and caUS8 contact burning and possible
fai.lure.
The Centralab lever keys have excellent wiping action and will
probably not require any cleaning.
If one of these keys is
diUw.ged, i.t is better to replace it than to a ttewpt to repair
it.
Use the parts list for the description, if i.t is necessary
to order a nevI one.
MODIFICATIONS
In the dosign and construction of tho equipnent we have tried
to provide a consolo which would give Llost installations ade-
quate operati.ng facilities.
Realizing, however, that sone
users may require facilities that are not co",.u;lOn, we have in-
cluded in this section inforilation about possible wodifications
\>1hic11 can be nade on the console.
Plan your Dodification care-'
fully and allot sufficient tin", to COLlplete it so that it vlill
be well executed and will not bo a source of trouble.
·-20-
The Executive
6/26/62
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