Measurement Computing LGR-5320 Series - Manual (Page 34)

LGR-5320 Series User's Guide Specifications
34
Counters
Table 10. Counter specifications
Parameter Condition Specification
Counter type  LGR-5325: Conventional
 LGR-5327/5329: Conventional and Quadrature (x1, x2, x4)
Number of channels 4
Inputs LGR-5325: Counter, Up/Down, Gate
LGR-5327/5329: Phase A+/A–, Phase B+/B–, Index +/–
Resolution (programmable) 32-bit or 16-bit.
Count Modes Up/down counting
Period/frequency counting
Modulo-N
Quadrature counting (LGR-5327/5329 only)
Debounce times (programmable) 16 steps from 500 ns to 25 ms; positive or negative edge
sensitive; glitch detect mode or debounce mode
Timebase accuracy 50 ppm
LGR-5325
only
Input voltage range 0 V to 5.5 V
Input type TTL
Input
characteristics
49.9 KΩ pull-down resistor
Maximum input
voltage range –0.5 V to 7.0 V
Input high voltage 2.0 V
Input low voltage 0.8 V
LGR-5327/
5329 only
Receiver type Quad DIFF receiver
Configuration Each channel consists of Phase A input, Phase B input and Index
input, with each input switch selectable as SE or DIFF.
DIFF  Phase A, Phase B and Index (+) inputs at user connector routed
to (+) inputs of the DIFF receiver.
 Phase A, Phase B and Index (–) inputs at user connector routed
to (–) inputs of the DIFF receiver.
SE  Phase A, Phase B and Index (+) inputs at user connector routed
to (+) inputs of DIFF receiver.
 Phase A, Phase B and Index (–) inputs at user connector routed
to ground.
 (–) inputs of DIFF receiver routed to +3 V reference.
Common mode
input voltage range ±12 V max
Differential input
voltage range ±12 V max
Input sensitivity ±200 mV
Input hysteresis 50 mV typ
Input impedance 12 k
Ω min
Absolute
maximum input
voltage DIFF ±14 V max