Datasheet

1.888.KEITHLEY (U.S. only)
www.keithley.com
25
SWITCHING AND CONTROL
A GREATER MEASURE OF CONFIDENCE
3750
Multifunction Control Card
40 digital I/O bits, 2 analog output channels, and 4 counters
Use the Model 3750 to monitor and control your automated test system. The flexibility and speed
provided by the 40 digital I/O bits, four counters, and two analog outputs make it well-suited for
a wide variety of system control applications.
Digital I/O
The Model 3750 offers 40 digital I/O bits arranged in five banks. Each bank is comprised of eight
bits each, and each bank can be programmed as either input or output. Digital I/O is often used to
control processes and monitor the status of switches, contacts, and other control points. Additional
features include scanning capabilities, such as writing a unique output pattern or reading banks
of inputs at rates up to 1000 rdgs/second. Also, pattern matching is available, making it ideal for
complex event algorithms.
Further versatility is provided by supporting external voltage levels of up to 30V and output current
sink levels of 300mA for control of external devices like RF/microwave relays.
Analog Outputs
The two analog outputs of the Model 3750 are designed for general purpose applications such as
setpoint control or as bias supplies to your device under test. For maximum utility, these outputs are
programmable as voltage (±12V) or current (0–20mA or 4–20mA). A number of protection features
are provided, including monitoring for current and/or voltage compliance and the ability to disconnect
automatically during fault conditions. Output relays are supplied for each channel, ensuring mechanical
isolation between your control device and the analog output.
Counters
Four 32-bit counters are provided with a maximum input rate of 1MHz. Each counter has a gate input
that offers precise control of event counting and totalizing for a broad range of system components,
such as: fixtures, limit switches, pass/fail indicators, revolutions, or time-related quantities. The
counters, like the digital I/O, can be used in scanning operations and pattern matching as well as
s upporting reading rates of up to 1000 rdgs/second.
Self-calibration
When your Model 3706A mainframe is equipped with the high performance multimeter option,
hardware and software is provided for self-calibration of analog outputs (voltage and current) and
counter thresholds.
• 40 bidirectional digital
input/output bits
• High current driver outputs for
sinking (300mA)
• Internal 5V, 50mA logic supply
for powering external logic
circuits
• 2 isolated analog output
channels, programmable to
±12V, 0–20mA, or 4–20mA
• 4 gated 32-bit counters with
1MHz input rate
• Screw terminal connections
provided with removable
3750-ST accessory
• External supply voltage
supported on digital I/O
Ordering Information
3750 Multifunction
Control Card
ACCESSORIES AVAILABLE
3721-MTC-1.5 50-pin female-to-male D-sub Cable Assembly,
1.5m (4.9 ft)
3721-MTC-3 50-pin female-to-male D-sub Cable Assembly,
3m (9.8 ft)
3750-ST Screw Terminal Block
3790-KIT50-R 50-pin female D-sub Connector Kit (contains 2
D-sub connectors and 100 solder cup contacts)
SERVICES AVAILABLE
3750-3Y-EW-STD 1-year factory warranty extended to 3 years
from date of shipment
3750-5Y-EW-STD 1-year factory warranty extended to 5 years
from date of shipment
C/3750-3Y-DATA 3 (Z540-1 compliant) calibrations within 3 years
of purchase*
*Not available in all countries
Multifunction control card Multifunction control card