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

Duty Cycle Digital Panel Meter
CE Mark   UL Mark RoHS Mark

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 Meter

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.

Signal conditioner for duty cycle meterThe 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.

Specifications

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
Signal connections for duty cycle meter

Applications

Duty Cycle Mode

Duty cycle trace showing ON and OFF periods 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 meter to indicate ON time of a pulsed 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.

  Quantity
Main
Board
L7  Extended Main Board, Green LEDs
L8  Extended Main Board, Red LEDs
$270
$270
Note: Use of the Extended Main Board makes this counter also suitable for A-B time interval, stopwatch, frequency, rate, period, square root of rate, up or down total, arithmetic functions, simultaneous rate and total, phase angle, batching, and custom curve linearization.  
Power Isolated 95-240 Vac ±10%
Isolated 12-30 Vac or 10-48 Vdc
NC
$30
Setpoint
Output
None
Dual 8A Contact Relays
Isolated Dual Solid State Relays
NC
$80

$55
Analog
Output
None
Isolated 0-20 mA & 0-10 V
NC
$90
Digital
Interface
None
Isolated RS-232
Isolated RS-485
Isolated Modbus RS-485
NC
$60

$80

$90
Input
Type
FR  Dual-Channel Pulse Input Signal Conditioner  NC
Add-on
Options
EB  Extra bight red LED display
BL  Blank lens without button pads
CBL01  RJ11-to-DB9 cable
CBL02  USB-to-DB9 adapter
IPC 
Clear front panel cover sealed to NEMA 4X / IP65
BOX1 
NEMA-4X wall-mount enclosure with 1/8 DIN cutout
BOX2 
BOX1 plus IPC
$30
NC

$19

$39

$40

$140

$180
 
Configured model number L70000FR
Configured price per model $270
Quantity 1
Extended price $270
 

 

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Laurel Electronics, Inc.
Industrial Instrumentation & Displays
3183-G Airway Avenue
Costa Mesa, CA 92626, USA
Tel:      
Fax:
     
(714) 434-6131
(714) 434-3766

  
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