User manual

8 U2300A Series DAQ Service Guide
1 Characteristics and Specifications
Digital I/O
Model Number U2355A | U2356A | U2331A
Number of bits 24-bit programmable input/output
Compatibility TTL
Input voltage V
IL
= 0.7 V max, I
IL
= 10 µA max
V
IH
= 2.0 V min, I
IH
= 10 µA max
Input voltage range –0.5 V to +5.5 V
Output voltage V
OL
= 0.45 V max, I
OL
= 8 mA max
V
OH
= 2.4 V min, I
OH
= 400 µA max
General Purpose Digital Counter
Model Number U2355A | U2356A | U2331A
Maximum count (2³¹-1) bits
Number of channels Two independent up/down counter
Compatibility TTL
Clock source Internal or external
Base clock available 48 MHz
Maximum clock source frequency 12 MHz
Input frequency range 0.1 Hz to 6 MHz at 50% duty cycle
Pulse width measurement range 0.167 µs to 178.956 s
Analog trigger
Model Number U2355A | U2356A | U2331A
Trigger source All analog input channels, External analog trigger (EXTA_TRIG)
Trigger level ±Full Scale for internal; ±10 V for external
Trigger conditions Above high, below low and window (software selectable)
Trigger level resolution 8 Bits
Bandwidth 400 kHz
Input Impedance for EXTA_TRIG 20 kΩ
Coupling DC
Overvoltage Protection Continuous for ±35 V maximum