Laurel Electronics LAUREATE SERIES 2 COUNTER-TIMER-SERIAL INPUT METER - Manual (Page 72)

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21. SPECIFICATIONS
DISPLAY
Type ................................................6 LED digits, 7-segment, 14.2mm, plus 4 LED indicators
Digit Color ...........................................................................................................Red or green
Display Range ......................................................................................... -999999 to +999999
CONVERSION (FREQUENCY INPUT)
Conversion Technique ................................................................................................1/period
Conversion Rate................................................. Gate Time + 30 ms + 2 signal periods (max)
Gate Time ....................................................................................0 to 199.99 sec (selectable)
Time Before Zero Output (Time-Out) ...........................................0 to 199.99 sec (selectable)
Output & Display Update Rate ......................................................... Same as conversion rate
Time Base Accuracy .............................................................................. Calibrated to ±2 ppm
INPUT ISOLATION
CMV from DC to 60 Hz................................................................................Withstand 250Vac
Dielectric strength....................................................... 3.5 kV ac for 5 sec, 2.3 kV ac for 1 min
DUAL CHANNEL SIGNAL CONDITIONER
Accuracy at 25ºC..........................................................................................................±2 ppm
Tempco ........................................................................................................ ±1 ppm/degree C
Long-Term Drift of Crystal ....................................................................................±5 ppm/year
Signal Types............... AC, NPN, PNP transistor outputs, contact closures, magnetic pickups
Max Pulse Rate ................................................ 1 MHz on Channel A, 250 kHz on Channel B
Channel Isolation............................................ Channel A & channel B share common ground
Low Pass Filter...........................................................................250 Hz or 30kHz (selectable)
Hysteresis ............................................................................... 15 mV to 2.2 Vp-p (selectable)
Trigger level...............................................................................±15 mV to ±1.7 V (selectable)
Debounce Circuitry............................................................................. 0, 3, 50 ms (selectable)
PROCESS RECEIVER & TOTALIZER SIGNAL CONDITIONER
Signal Levels .................................................................0-1 mA, 4-20 mA, 0-10 V (selectable)
Accuracy at 25ºC....................................................................................................... ±0.025%
Span Tempco ......................................................................................±0.003% of reading /°C
Zero Tempco .....................................................................................±0.003% of full scale /°C
QUADRATURE SIGNAL CONDITIONER
Signal Type .................................................................Differential or single-ended quadrature
Transitions Monitored............................................................................................ x1, x2 or x4
Max Pulse Rate ................................................. 250 kHz at x1, 125 kHz at x2, 62.5 kHz at x4
Differential high threshold voltage ............................................................................. +200 mV
Differential low threshold voltage................................................................................ -200 mV
Single-ended high voltage ..................................................................................... 2.5V to 10V
Single-ended low voltage ........................................................................................-1V to +1V
Input resistance, typ. ................................................................................................. 17 kOhm
Conversion Technique for Rate...................................................................................1/period