Datasheet

1.888.KEITHLEY (U.S. only)
www.keithley.com
27
SWITCHING AND CONTROL
A GREATER MEASURE OF CONFIDENCE
3750
Multifunction Control Card
40 digital I/O bits, 2 analog output channels, and 4 counters
VCOM
VCOM
<100pF
Test Circuit for Voltage Output
Channels 10 and 11
DAC
VOUT
1.2kΩ
+
–
ICOM
<100pF
Test Circuit for Current Output
Channels 10 and 11
DAC
IOUT
500Ω
COUNTER/TOTALIZER INPUT
MAXIMUM COUNT: 2
32
– 1.
MAXIMUM INPUT RATE: 1MHz, rising or falling edge, programmable.
MINIMUM INPUT PULSE WIDTH: 500ns.
INPUT SIGNAL LEVEL: 200mV p-p (minimum), 42V peak (maximum).
THRESHOLD: AC (0V) or TTL logic level.
GATE INPUT: TTL–HI (Gate+), TTL–LO (Gate–) or NONE.
MINIMUM GATE INPUT SETUP TIME: 1μs.
COUNT RESET: Manual or Read + Reset.
SYSTEM INPUT MINIMUM READ SPEED: 1000 readings/second.
ALARM: Trigger generation is supported for a count match or counter overflow
on any of channels 6 though 9.
ANALOG VOLTAGE OUTPUT
The isolated analog voltage output is designed for general purpose, low power applications.
OUTPUT AMPLITUDE
1
: ±12V up to 10mA.
OVERLOAD CURRENT: 21mA minimum.
RESOLUTION: 1mV.
FULL SCALE SETTLING TIME
2
: 1ms to 0.1% of output.
DC ACCURACY
3
±(% of output + mV):
1 Year 23° ±5°C: 0.15% + 16mV.
90 Day 23° ±5°C: 0.1% + 16mV.
24 Hour 23° ±5°C: 0.04% + 16mV.
TEMPERATURE COEFFICIENT: ±(0.02% + 1.2mV)/°C.
10mV MAXIMUM UPDATE RATE: 350μs to 1% accuracy. System limited.
OUTPUT FAULT DETECTION: System fault detection is available for short circuit
output/current compliance.
ISOLATION: 300V peak channel to channel or channel to chassis.
PROTECTION: Optional disconnect during output fault conditions.
MINIMUM GUARANTEED STABLE CAPACITIVE LOAD: 10nF.
NOTES
1. Programming up to 1% over full scale range is supported.
2. Measured with standard load shown in Figure 3.
3. Measured with >10MW input DMM (DCV, filter, 1 PLC rate).
Warm-up time is 1 hour @ 10mA load with 3750-ST.
ANALOG CURRENT OUTPUT
The isolated analog current output is designed for 0–20mA or 4–20mA
unipolar modes of operation.
OUTPUT AMPLITUDE: 0 to 20mA or 4 to 20mA.
COMPLIANCE VOLTAGE: 11V minimum.
MAXIMUM OPEN CIRCUIT VOLTAGE: 16V.
RESOLUTION: 1μA.
FULL SCALE SETTLING TIME
1
: 1ms to 0.1% of output.
DC ACCURACY
2
±(% of output + µA):
1 Year 23° ±5°C: 0.15% + 18μA.
90 Day 23° ±5°C: 0.1% + 18μA.
24 Hour 23° ±5°C: 0.04% + 18μA.
TEMPERATURE COEFFICIENT: ±(0.02% + 1.6μA)/°C.
OUTPUT FAULT DETECTION: System fault detection is available for open
circuit output/voltage compliance.
ISOLATION: 300V peak channel to channel or channel to chassis.
PROTECTION: Optional disconnect during output fault conditions.
NOTES
1. Measured with standard load shown in Figure 3.
2. Measured with <2W shunt DMM (DCI, filter, 1 PLC rate). Warm-up time is 1 hour with 3750-ST.
Figure 3. Standard load test circuits
GENERAL
CONNECTOR TYPE: Two 50-pin male D-shells.
OPERATING ENVIRONMENT: Specified for 0ºC to 50ºC. Specified to 70% R.H. at 35ºC.
STORAGE ENVIRONMENT: –25ºC to 65ºC.
WEIGHT: 1.27kg (2.80 lbs.).
SAFETY: Conforms to European Union Directive 73/23/EEC, EN61010-1.
EMC: Conforms to European Union Directive 2004/108/EC, EN61326-1.
POWER BUDGET INFORMATION:
Quiescent Power: 3300mW.
Digital Outputs Each Channel (1 through 5): 325mW.
Analog Channel Each (10 and 11): 820mW.
Totalizer Channel All (6 through 9): 730mW.
Analog channels and counter channels may optionally be turned off to conserve
system power.
See Chapter 8 of the Series 3700A user’s manual for more detailed information.
Model 3750 specifications Model 3750 specifications