Laureate™ Frequency, Rate & Period Meter

With dual, independently field-scalable channels
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Frequency meter by Laurel Electronics
Key Features
  • Frequencies from 0.005 Hz to 1 MHz
  • 6-digit resolution at update rates up to 25/s
  • Line frequency measurement to 60.0000 in a few line cycles
  • Selectable "count by" of 10 or 100 with rounding
  • Universal AC power, 85-264 Vac
  • NEMA 4X, 1/8 DIN case
Display
Readout
Display Range
Zero Adjust
Span Adjust
Indicators
6 LRD digits, 7-segment, 14.2 mm (.56"), red or green.
-999999 to +999999, XXXXEX notation beyond 999999
-999999 to +999999
0 to 999999
Four LED lamps
Inputs
Types

Signal Ground
Channel A Freq.
Channel B Freq.
Minimum Signal
Maximum Signal
Noise Filter
Contact Debounce
AC, pulses from NPN, PNP transistors, contact closures,
magnetic pickups.
Common ground for channels A & B
0.005 Hz to 1 MHz
0.005 Hz to 250 kHz
Nine ranges from (-12 to +12 mV) to (+1.25 to +2.1V)
250 Vac
1 MHz, 30 kHz, 250 Hz (selectable)
0, 3, 50 ms (selectable)
Update Rate
Freq. Technique
Conversion Time
Gate Time
Time Before Zero Out
Inverse period
Gate time + 30 ms+ 0-2 signal periods
Selectable 10 ms to 199.99 s
Selectable 10 ms to 199.99 s
Accuracy
Time Base
Span Tempco
Long-term Drift
Crystal calibrated to ±2 ppm
± 1 ppm/°C (typ)
± 5 ppm/year
Power
Voltage, standard
Voltage, optional
Frequency
Power Isolation
85-264 Vac or 90-300 Vdc (DC operation not UL approved)
12-32 Vac or 10-48 Vdc
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test
Excitation Output (standard)
5 Vdc
10 Vdc
24 Vdc
Output Isolation
5 Vdc ± 5%, 100 mA
10 Vdc ± 5%, 120 mA
24 Vdc ± 5%, 50 mA
50 Vdc to meter ground
Analog Output (optional)
Output Levels

Current compliance
Voltage compliance
Scaling
Resolution
Isolation
4-20 mA, 0-20 mA, 0-10V, -10 to +10V (single-output option)
4-20 mA, 0-20 mA, 0-10V (dual-output option)
2 mA at 10V ( > 5 kΩ load)
12V at 20 mA ( < 600Ω load)
Zero and full scale adjustable from -99999 to +99999
16 bits (0.0015% of full scale)
250V rms working, 2.3 kV rms per 1 min test
(dual analog outputs share the same ground)
Relay Outputs (optional)
Relay Types

Current Ratings

Output common
Isolation
2 Form C contact relays or 4 Form A contact relays (NO)
2 or 4 Form A, AC/DC solid state relays (NO)
8A at 250 Vac or 24 Vdc for contact relays
130 mA at 140 Vac or 180 Vdc for solid state relays
Isolated commons for dual relays or each pair of quad relays
250V rms working, 2.3 kV rms per 1 min test
Serial Data I/O (optional)
Board Selections

Protocols
Data Rates
Digital Addresses
Isolation
EthernetEthernet-to-RS485 serverUSBUSB-to-RS485 server,
RS485 (dual RJ11), RS485 Modbus (dual RJ45), RS232.
Modbus RTU, Modbus ASCII, Laurel ASCII protocol
300 to 19200 baud
247 (Modbus), 31 (Laurel ASCII).
250V rms working, 2.3 kV rms per 1 min test
Environmental
Operating Temp.
Storage Temp.
Relative Humidity
Protection
0°C to 60°C
-40°C to 85°C
95% at 40°C, non-condensing
NEMA-4X (IP-65) when panel mounted
Electrical Connections
Signal pinout of Laurel frequency, rate and period meter
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