7158
Low Current Scanner Card
10-channel
The Model 7158 provides quality low-current
switching at an affordable price . The offset
current error generated is specified <1pA, with
typical performance at <30fA . When used with a
voltage source and electrometer or picoammeter,
this card can easily automate insulation resistance
tests, reverse leakage tests on semiconductor
junctions, or gate leakage tests on FETs .
CONTACT LIFE:
>10
6
closures at maximum signal levels;
>10
7
closures at low signal levels .
CONTACT RESISTANCE:
<1W .
CONTACT POTENTIAL:
<200µV .
OFFSET CUR RENT:
<1pA (<30fA typical) .
3dB BANDWIDTH:
1MHz typical .
ACTUATION TIME:
<1ms, exclusive of mainframe .
CHANNEL ISOLATION:
>10
14
W .
INPUT ISOLATION: Differential:
>10
9
W,
<50pF .
Common Mode:
>10
9
W,
<150pF .
COMMON MODE VOLTAGE:
<30V maximum .
Use with 7001 and 7002 switch mainframes
•
sub-picoamp offset current
•
Maintains current path for
unselected channel
•
bNC connectors
ordering Information
7158
low Current
scanner Card
The Model 7158 is designed to maintain the
current path even when the channel is deselected .
Input connectors are BNC for shielding of the
sensitive measurements and for compatibility with
low noise coaxial cables such as Keithley accessory
cables Models 4801 and 4803 . Two outputs are
provided to allow for chaining several scanner
cards to one measurement instrument, and an
isolation relay in the output HI minimizes interac-
tion between cards .
CHANNELS PER CARD:
10 .
CONTACT CONFIGURATION:
Single pole, simultaneous break
and make for signal HI input . Signal LO is common for all 10
channels and output . When a channel is off, signal HI is con-
nected to signal LO .
CONNECTOR TyPE:
BNC .
RELAy DRIVE CURRENT:
100mA per card typical (regardless
of channel closures selected) .
MAXIMUM SIGNAL LEVEL:
30V, 100mA peak (resistive load) .
aCCEssorIEs aVaIlablE
4801
4802-10
4803
Low Noise Male to Male BNC Input Cable
Low Noise BNC to Unterminated Cable, 10 ft .
Low Noise BNC Cable Kit for 7158
sErVICEs aVaIlablE
7158-3Y-EW
1-year factory warranty extended to 3 years
from date of shipment
Ch. 1
Ch. 2 – 9
Ch. 10
Output
1
accessories supplied
low Noise Male to
4801
Male bNC Input Cable
Output
2
7168
Nanovolt Scanner Card
8-channel, 2-pole
The Model 7168 is an 8-channel, 2-pole card
with <30nV of thermal offset . It will switch any
one of eight signals to one output in less than
3ms . Channel offset leakage current is <50pA
at 23°C . When the 7168 is used with the Model
2182A, the noise and drift performance of the
2182A is not degraded .
CHANNELS PER CARD:
8 .
CONFIGURATION:
Two poles per channel, input HI and LO .
CONNECTOR TyPE:
Screw terminal to bare copper printed
circuit pad .
MAX. SIGNAL LEVEL:
10V, 50mA peak (resistive load only) .
CONTACT RESISTANCE:
<12W .
CONTACT POTENTIAL (HI to LO) BETWEEN CHANNELS:
<30nV when properly zeroed with supplied leads (see manual
for recommended procedure) . Typically <60nV without
zeroing .
CONTACT TyPE:
Solid state JFET switch .
ACTUATION TIME:
<3ms, exclusive of mainframe .
INPUT LEAKAGE:
<50pA per channel at 23°C .
INPUT ISOLATION:
>10
9
W,
<40pF between any input terminals
or between any input terminal and earth .
COMMON MODE VOLTAGE:
30V peak .
MAXIMUM VOLTAGE BETWEEN ANy TWO TERMINALS:
10V .
WARM-UP:
2 hours in mainframe for thermal stability .
HI
Ch. 1
LO
HI
Ch. 2
LO
Ch. 3 – 7
HI
Ch. 8
LO
HI
Output
LO
•
<30nV contact potential
•
bare copper terminal
connections
OPERATING ENVIRONMENT:
0°–40°C; up to 35°C at 70% R .H .
STORAGE ENVIRONMENT:
–25° to 60°C .
aCCEssorIEs suPPlIED
2107-4
7168-316
Low Thermal Input Cable for 2182A (1 supplied)
Low Thermal Input Cables for 7166 (8 supplied)
ordering Information
7168
8-channel Nanovolt
scanner Card
sErVICEs aVaIlablE
7168-3Y-EW
1-year factory warranty extended to 3 years from
date of shipment
1.888.KEITHLEY
(U.S. only)
www.keithley.com
A Greater Measure of Confidence
SWITCHING AND CONTROL
Use with 7001 and 7002 switch mainframes
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