Duty Cycle Meter for On/Off Percentage of Periodic Events

Features

Measures ON or OFF period as a percentage of total period.
Resolution of 1%, 0.1% or 0.01%.
Inputs from NPN or PNP proximity switches, contact closures, digital logic, magnetic pickups down to 12 mV, or AC inputs up to 250 Vac.
Trigger on positive or negative pulse edges.
Frequency from .005 Hz to 10 kHz.
6-digit red or green LED display.
Isolated 5, 10 or 24 Vdc excitation output to power sensors.
NEMA 4X, 1/8 DIN case.
Dual relay option.
Analog output option.
Serial communication options.
Low voltage AC & DC power.
Certified to UL 61010C-1 (UL mark), EN 61010-1 (CE mark), and RoHS.

Description

Duty Cycle Mode

Duty cycle is a measure of ON or OFF period as a percentage of total period. Duty cycle is determined by averaging an integral number of periods over a gate time which is selectable from 10 ms to 199.99 s. The same signal is applied to Channels A and B. The meter divides the average pulse width by the period between pulses and expresses this ratio in percent. A resolution of 1%, 0.1% or 0.01% is selectable. By selecting leading or falling pulse edges, the ON or OFF duty cycle can be displayed.

Duty cycle measurement is used to monitor modulated proportional control systems and pulse-modulated systems, such as radar, lasers or packet radio. For long periods, duty cycle can be measured by using the A and B channels of the Laureate dual-channel counter to totalize AC line cycles and having the counter display the ratio of the two totals scaled to percent.

The Laureate duty cycle meter uses the FR dual-channel signal conditioner board and Extended counter main board.

Universal Signal Conditioner

The dual-channel signal conditioner accepts inputs from proximity switches with PNP or NPN output, TTL or CMOS logic, magnetic pickups, contact closures, and AC signals from 12 mV to 250 Vac. Jumper selections provide optimum operation for different sensor types and noise conditions.

A built-in isolated 5, 10, or 24 Vdc excitation supply can power proximity switches and other sensors, and eliminate the need for an external power supply.

Other Features & Options

Laureates may be powered from 95-240 Vac ±10% or optionally from 12-30 Vac or 10-48 Vdc. They are available with red or green LEDs. They are housed in a 1/8 DIN case that meets NEMA 4X (IP65) specifications from the front when panel mounted. Any setup functions and front panel keys may be locked out for simplified usage and security.

Duty Cycle Mode
Item Displayed Display Units Frequency Range Accuracy Maximum Timing Interval	ON or OFF duty cycle of periodic pulse waveshape 1%, 0.1%, 0.01% 0.005 Hz to 10 kHz 0.01%, 0.005 Hz to 500 Hz, 0.1% at 5 kHz, 1% at 10 kHz 199.99 s
Display
Readout Range Indicators	6 LED digits, 7-segment, 14.2 mm (.56"), red or green -999999 to +999999 Four LED lamps
Inputs
Types Signal Ground Minimum Signal Maximum Signal Maximum Frequency Contact Debounce	AC, pulses from NPN, PNP transistors, contact closures, magnetic pickups. Common ground for channels A & B. 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
Conversion Interval Gate Time Time Before Zero Output	Gate time + 30 ms + 0-2 signal periods Selectable 10 ms to 199.99 s Selectable 10 ms to 199.99 s
Power
Voltage, standard Voltage, optional Frequency Power Isolation	95-240 Vac ±10% or 90-300 Vdc (DC operation not UL approved) 12-30 Vac or 10-48 Vdc DC or 47-63 Hz 250V rms working, 2.3 kV rms per 1 min test
Excitation Output
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 Compliance Scaling Resolution Isolation	0-10V, 0-20 mA, 4-20 mA (jumper selectable) 2 mA at 10V (5 kOhm load), 12V at 20 mA (0-60 ohm load) Zero and full scale adjustable from -999999 to +999999 12 bits (0.025% of full scale) 250V rms working, 2.3 kV rms per 1 min test
Dual Contact Relay Outputs (optional)
Relay Type Load Rating Isolation	Form C 8A at 250 Vac or 24 Vdc 250V rms working, 2.3 kV rms per 1 min test
Dual Solid State Relay Outputs (optional)
Relay Type Load Rating Isolation	SPST, normally open, Form A 120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance 250V rms working, 2.3 kV rms per 1 min test
Serial Data I/O (optional)
Board Selections Protocols Data Rates Digital Addresses Isolation	RS232, RS485, Modbus RS485 Modbus RTU, Modbus ASCII, simpler Laurel ASCII 300 to 19200 bps 247 (Modbus), 31 (Laurel ASCII), 250V rms working, 2.3 kV rms per 1 min test
Environmental
Operating Temperature Storage Temperature 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
Signal Connections

Applications
Duty Cycle Mode
	Duty cycle indicates the ON or OFF time in percent from 0% to 100% of period for repetitive pulse train. In the illustration, duty cycle is 100 x t/P. The same signal is applied to the A and B channels.
Duty Cycle and Elapsed Time of a Laser
	Duty cycle can be used to indicate the ON time of a pulsed laser in relation to total time. Laureate counters can also measure elapsed time, the number of pulses, average width in µs, the number of pulses, and total energy applied.

Ordering Guide
Laureate Duty Cycle Meter
Click on the radio buttons to build a model number with pricing.

Laureate™ Duty Cycle Meter For display of ON or OFF period in percent

Laureate™ Duty Cycle Meter
For display of ON or OFF period in percent