Measurement Computing LGR-5320 Series - Manual (Page 32)

LGR-5320 Series User's Guide Specifications
32
External analog trigger
Table 6. External trigger specifications
Parameter Conditions Specification
External analog trigger source ATRIG input (pin 78)
Analog trigger input ranges LGR-5325: ±10 V
LGR-5327/5329: ±30 V, ±10 V,
software-selectable
Absolute maximum input voltage ATRIG_IN to AGND LGR-5325: ±25 V V max (power on and
power off)
LGR-5327/5329: ±38 V max (power on and
power off)
Input impedance ±30 V range
(LGR-5327/5329 only) 1 M
Ω (power on/off)
±10 V range 10
GΩ (power on)
1 GΩ (power off)
Trigger modes Configurable for:
 Positive or negative slope
 Level
Trigger/hysteresis resolution 12 bits, 1 in 4096
Trigger/hysteresis levels LGR-5325: ±10 V/4096
LGR-5327/5329: ±10 V/4096 or
±30 V/4096, software selectable
Trigger/hysteresis accuracy ±2% of reading, ±50 mV offset
Latency 1.5 µS
Full power bandwidth (–3 dB) 1 MHz
Digital input
Table 7. Digital Input specifications
Parameter Specification
Number of inputs 16 channels
Input voltage range  LGR-5325/5327: 0 V to 28 V
 LGR-5329: 0 V to 30 V
Input type  LGR-5325/5327: TTL
 LGR-5329: Industrial
Input characteristics  LGR-5325/5327: 47 k
Ω pull-down resistor, 39.2 kΩ series resistor
 LGR-5329: Resistor divider 39.2 k
Ω series resistor and 10 kΩ shunt resistor
connected to IGND
Isolation (LGR-5329 only) 500 VDC min (Note 6)
Maximum input voltage level  LGR-5325/5327: 32 V (power on/off)
 LGR-5329: 36 V (power on/off)
Minimum high-level input
voltage threshold  LGR-5325/5327: 2.0 V max
 LGR-5329: 10.04 V max
Maximum low-level input
voltage threshold  LGR-5325/5327: 0.8 V min
 LGR-5329: 3.85 V min
Event logging (LGR-5327/5329
only) Change of state, pattern recognition. Event time stamped using real time clock.
Note 5: The digital inputs are electrically isolated from the analog and digital I/O circuitry. The IGND (isolated
ground) pins should be used as the ground return for the digital inputs.