Service Manuals, User Guides, Schematic Diagrams or docs for : Keithley 70xx 7057A_901_01D
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Model 7057A
Thermocouple Scanner Card
Instruction Manual
Contains Operating and Servicing Information
Publication Date: January 1992
Document Number: 7057A-901-01 Rev. D
WARRANTY
LIMITATION OF WARRANTY
Safety Precautions
The following safety precautioos should be obsewed before using this product and any asno-
ciated instrumcntatioo. Although some inrtromeots and accessories woold nonnally bo used
with nowhazardous voltages, there arc situations wberc hazardous conditions may be present.
This product is intended for use by qualified personnel who rccogoiu: shock hazards and are
familiar with tbc safety pnxaotions rcqoircd to avoid possible injuly. Read lbe operating it]-
formation carefully before using the product.
`The types of product users arc:
Kesponsiblc body is tbe iodividunl or group responsible for the USCsod owinleoaoce of
equipment, for ensuring tlnt the equipment ia operated within its spccilications and operat-
ing limits, and for ensuring that operators are adequately trained.
Operators use the product for its intended function. Tbey most be trained in electrical safety
procedures and proper use of the iostrument. `lhey most be protected from electric shock and
~onmt with hazardous live circuits.
Maintenance personnel perform mutioe procedures oo the product to keep it operadog, for
example, setting the hoc voltage or replacing consumable materials. Maintenance proccdurcs
am dcacribed in the manual. The procedures explicitly state if the operator ~nay perform them.
Othcrwisc, they should be performed only by senice pcnonoel.
Service personnel are trained to work on live circuits, sod perfoonn safe installations sod re-
pairs of products. Ooly properly trained setvice personocl may perform installation and scr-
vice procedures.
Exercise extreme caution whco a shock hazard is present. Lethal voltage may be present on
cable coonector jacks or test fixtures. 111~ American National Standards lostitute (ANSI)
stam that a shock hazard exists wheo voltage levels greater than 30V RMS, 42.4V peak, or
60VDC are present. A good safety practice is to expect that hazardous voltage is present
in any unknown circuit before measuring.
Users of this product must be protected fmm electric shock at all timer. The responsible body
must eosum thtat wets aw pwented a.cce~saod/orinsulatcd from every connection point. lo some
cases, conoectiuns most be exposed to potential buman cootact. Product usa io these circuo-
stances must be trained to protect themselves from the risk of electric shock. If the circuit is ca-
pable of operating at or abovc 1wO volts, no conductive part of the circuit may be exposed.
AY described in the Ioteroational Electratechnical Commission (IEC) Standard IEC 664, dig-
ital multimcter measuring circuits (e.g., Keifhley Models 175A, 199, 2OOQ,2COl, 2002, and
2010) are Installation Category II. All other instruments signal tennioals are Installation Cat-
egory I and must oat be conoected to mains.
Do not conoect switching cards directly to unlimited power circuits. They are inlendcd to bc
used with impedance limited sources. NEVER connect switching cards directly to AC mains.
Wheo conoccting sources to switching cards. iostall protective devices to limit fault current
sod voltage to tbc card.
Before operating ao instrument, make sure the line cord is connected to a properly grounded
power receptacle. Inspect the connecting cables, test leads, and jumpers for possible wear,
cracks, or breaks bcforc each oso.
For maximum safety, do not touch the product, test cables, or any other instrumcots while pow-
er is applied to the circuit under test. ALWAYS remove power from the entire test system sod
dischuge soy capxitors before: coooccting or disconnecting cables or jumpers, installing 01
removing switching cards. or making iotemtil chaogcs, socb as installing or nzmoviog jumpers.
Vu not touch soy object that could provide a con-cot path to tbc common side of the circuit
under test or power line (eatth) ground. Always make measurements witb dry hands while
standing oo a dly, insulated surface capable of withstanding tbc voltage bciog measured.
The instrument and accessories most be used in accordance with its specifications and op-
eratiog iostructioos or tbe safety of the equipment may be impaired.
Do not exceed the maximum signal levels of the instruments and accessories. as defined in
tbe speciticationr sod operatiog information, and es show on the instrument or test fixture
panels, or switcbiog cant.
When fores are used in a product, replace with same type sod rntiog forcootioued pmtectioo
against fire hazard.
Cbassir connections must only be used as shield coooectioos for me~suriog circoits, NOT as
safety eaflh ground connections.
If you are using II test fixture, keep the lid closed while power is applied to the device under
test. Safe operation requires tbe we of a lid interlock.
1ra@ screw is present, connect it to safety earth ground uaiog the wire recommended in
the user documentation.
The ! symbol on an iostroment indicates that the user should refer to the operating ill-
n
stmctions located io tbc manual.
The h symbol on al iostmment shows that it CNI source or IIICRIIUII: loo0 volts or more, ill-
eluding the combined etTect of normal ad common mode voltages. Use stiuldarrl safety precau-
lions to avoid pcrsooal cootect with these voltages.
TIE WARNING beading in A manual enplaios dangers that might result in personal injury or
death. Always read the associated information wy carefully hcfore ptxformiog the indicated
pC"CCdU~C.
The CAUTION beading in a manual explains hazards that could damage the instrument.
Such damage may invalidate the warrmty.
lostrumcntatioo and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
To maintain pmtcctioo from electric shock and ftre, replacement components in mains cir-
coils, including the power transfouner, test leads, and ioput jacks, must he purchased from
Keithley Instruments. Standard fuses, with applicable national safety appmvals, may be used
if the ratiog sod type are the same. Other components that are not safety r&ted may hc por-
chased from other suppliers as long as they are equivalent to tbe original component. (Note
that selected parts should be purchased only through Keithley Iostmmcnts to maiotain acco-
racy sod fonctiooality of the product.) If you we unsure about the applicability of a replacc-
ment component, call a Keithlcy Instruments office for information.
To clean an instrument. use a damp cloth or mild, water based cleaner. Clean the exterior
of the instrument only. Do not apply cleaner directly tb the instrument or allow liquids to
enter or spill on the instrument. Products that consist of a circuit hoard with no case or cbas-
sis (e.g., data acquisition board for installation into a computer) should neverrequire clean-
ing if handled according to instructiuns. If the board becomes contaminated sod operation
is affected. the hoard should he returned to the factory for proper cleaninglserviciog.
tie". 2rB
SPECIFICATIONS
CHANNELS PER CARD: 9 plus temperature reference.
CONTACT CONFIGURATION: 2 Pole Form A with common guard.
CONNECTOR TYPE: Screw terminals in isothermal block, No. 18 AWG wire
maximum.
RELAY DRIVE CURRENT: 12mA lper relay).
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