Keithley 7057A, 7058 Datasheet
7057A Thermocouple Scanner Card
9-Channel
TEMPERATURE REFERENCE:
TEMPERATURE OFFSET: ±0.05°C maximum from HI to LO of
any channel or between any two adjacent channels in one
column on the isothermal block. ±0.1°C maximum between any
two terminals on the isothermal block. Maximum additional
dynamic offset due to 10°C step change in environment:
±0.1°C after one hour settling.
REFERENCE OUTPUT: –1mV/°C (0mV at +30°C).
REFERENCE ACCURACY (1 Year): ±0.25°C (10°C to 35°C);
±0.5°C (0°C to 10°C and 35°C to 50°C).
WARM-UP: 1 hour to rated accuracy in mainframe.
MAX. SIGNAL LEVEL: 42V, 100mA, 2VA (resistive load only).
CONTACT POTENTIAL: <1µV.
CONTACT LIFE: >10
maximum signal levels.
CONTACT RESISTANCE: <2Ω to rated life.
CHANNEL ISOLATION: >10
INPUT ISOLATION: >10
COMMON MODE VOLTAGE: 200V peak.
SPECIFIED ENVIRONMENT: 10° to 35°C, up to 70% RH.
ACCESSORIES AVAILABLE
7401 Type K Thermocouple Wire Kit, 100ft.
• Cold junction compensated
• 2-pole Form A
• <1µV of switch contact potential
Ordering Information
7057A Thermocouple Scanner
Card
These cards permit monitoring of up to nine thermocouples or other transducers. The nine signal
channels use a guarded 2-pole configuration. An
isothermal block provides electrical isolation up to
42V while assuring excellent thermal conductivity
between cold junction terminations. A sensing
device mounted in the isothermal block monitors
the cold junction and outputs a calibrated reference voltage that is linearly related to the temperature. The Model 7057A provides a higher change
in reference output for improved cold junction
sensitivity. Formulae for converting the voltage
outputs of all of the most popular thermocouple
types are included in the manual. The contact
potential of <1µV per channel translates to
<0.025°C error for precision measurements on
type K thermocouples.
CHANNELS PER CARD: 9 plus temperature reference.
CONTACT CONFIGURATION: 2-pole Form A, with common
guard.
CONNECTOR TYPE: Screw terminals in isothermal block,
#18AWG maximum wire size.
RELAY DRIVE CURRENT: 12mA per relay typical.
7058 Low Current Scanner Card
Thermistor in a linearized bridge
8
closures cold switching; >106closures at
8
Ω, <10pF.
7
Ω, <150pF.
.
Use with 7001 and 7002 Switch Mainframes
• Sub-pA offset current
• 10-channel scanner
• Maintains current path for
unselected channel
• Triax connectors
Ordering Information
7058 Low Current Scanner
Card
Accessories Supplied
7024-3 Low Noise Triax Cable,
0.9m (3 ft.)
For optimum low-level current switching up to 10
channels, the Model 7058 is designed to introduce
minimal offset current error (under 1pA), while
guarding ensures that high isolation (10
15
Ω) is
maintained between input HI to input HI.
Removable jumpers allow channels to be configured as voltage switches. Triaxial input connectors
provide better shielding and permit direct connection to Keithley electrometers.
HI
Ch. 1
LO
GND
HI
Ch. 4
LO
GND
HI
Ch. 5
LO
GND
HI
Ch. 10
LO
GND
J
Ch.
2 – 3
Shielded
Jumper
J
(on back of
PC board)
J
Ch.
6 – 9
J
J = Removable Jumpers
J
CHANNELS PER CARD: 10.
CONTACT CONFIGURATION: Single pole, break-before-make for
signal HI input. Signal LO is common for all 10 channels. When
a channel is off, signal HI is connected to signal LO through an
internal removable jumper.
CONNECTOR TYPE: Two-lug triaxial.
RELAY DRIVE CURRENT: 24mA per relay typical.
MAXIMUM SIGNAL LEVEL: 200V, 100mA (resistive load only).
CONTACT LIFE: >10
maximum signal levels.
CONTACT RESISTANCE: <1Ω to rated life.
OutputInput
HI
LO
GND
HI
LO
GND
CONTACT POTENTIAL: <250µV.
ACTUATION TIME: <15ms, exclusive of mainframe.
CHANNEL ISOLATION: >10
nal jumper removed.
INPUT ISOLATION: >10
LO).
OFFSET CURRENT: <10
COMMON MODE VOLTAGE: <100V peak.
7
closures cold switching; >106closures at
15
Ω, <0.1pF with inter-
10
Ω, <50pF (Input HI to Input
–12
–13
A (<10
A typical).
ACCESSORIES AVAILABLE
7024-3 Low Noise Triax Cable, 3 ft.
7024-10 Low Noise Triax Cable, 10 ft.
7025-10 Low Noise Triax Cable with one end
unterminated, 10 ft.
1.888.KEITHLEY (U.S. only)
www.keithley.com
SWITCHING & CONTROL
A GREATER MEASURE OF CONFIDENCE
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