Measurement Computing USB-1608HS-2AO - Manual (Page 27)

USB-1608HS-2AO User's Guide Specifications
27
Analog input calibration
Table 6. Analog input calibration specifications
Parameter Specifications
Recommended warm-up time 15 minutes minimum
Calibration method Software calibration
Calibration interval 1 year
Calibration reference +10.000 V, ±5 mV maximum. Actual measured values stored in EEPROM
Tempco: 5 ppm/°C maximum
Long term stability: 30 ppm/1000 h
Digital input/output
Table 7. Digital I/O specifications
Digital type 5 V CMOS
Number of I/O 16
Configuration Eight input, eight output
Pull-up/pull-down configuration The eight input pins have 47 k resistors that may be configured to either pull-up
or pull-down with a jumper
Digital I/O transfer rate (system-paced) System-dependent, 33 to 8000 port reads/writes or single bit reads/writes per
second.
Input high voltage 2.0 V minimum, 5.5 V absolute maximum
Input low voltage 0.8 V maximum, –0.5 V absolute minimum
Output high voltage (IOH = –2.5 mA) 3.8 V minimum
Output low voltage (IOL = 2.5 mA) 0.7 V maximum
Power on and reset state Outputs: driven low
LED indicators Each I/O pin has an associated LED status indicator. A high at the pin will
cause the LED to be on. The LEDs may be disabled with jumpers - one jumper
for the input LEDs (JP1), and one jumper for the output LEDs (JP2).
External trigger
Table 8. External trigger specifications
Parameter Conditions Specification
Trigger source TRIG_IN input
Trigger input range ±10 V maximum.
Absolute maximum input voltage TRIG_IN to GND ±25 V maximum (power on)
±15 V maximum (power off)
Trigger threshold levels ±10V/4096; Software configurable
Input impedance 1 MΩ (power on)
1.5 kΩ (power off)
Trigger modes Software configurable for:
 Positive or negative slope
 Edge/level
 Retrigger
Threshold resolution 12 bits, 1 in 4096
Threshold accuracy ±0.25% FSR
Hysteresis ±5 mV
Full power bandwidth (-3 dB) 640 kHz