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

Duty Cycle Meter by Laurel Electronics
CE Mark   UL Listed Mark RoHS Mark Made in California Logo

Standard Features

Product Links

Specs
Mechanical
Serial I/O options
Power options
Relay options
Analog output option
Meter manual
Serial manual
Modbus manual
Setup software
Pricing

  • 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 0.005 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.
  • Certified to UL 61010C-1 (UL mark), EN 61010-1 (CE mark), and RoHS
    Options:
  • Low voltage power: 10-48 Vdc or 12-32 Vac
  • 2 or 4 output relays, electromechanical or solid state
  • 1 or 2 isolated analog outputs: 4-20 mA, 0-20 mA, 0-10V, -10 to +10V
  • Serial communications: RS232, RS485, Modbus RS485, USB, USB-to-RS485 converter

Description

Duty cycle meter by Laurel Electronics

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. The Laureate duty cycle meter uses the FR dual-channel signal conditioner board and Extended counter main board. For time intervals longer than 199.99 s, duty cycle can be measured by using the A and B channels of to totalize AC line cycles and having the counter display the ratio of the two totals scaled in percent.

Duty cycle meter signal condtioner board by Laurel ElectronicsThe Laureate dual-channel signal conditioner accepts inputs from proximity switches with an 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.

Designed for flexibility. Optional plug-in boards for communications and control include single or dual analog output boards, dual or quad relay boards, and serial communications boards. Laureates may be powered from 85-264 Vac or optionally from 12-32 Vac or 10-48 Vdc. The display is available with red or green LEDs. The 1/8 DIN case meets NEMA 4X (IP65) specifications from the front when panel mounted. Any setup functions and front panel keys can 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

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 kOhm load)
12V at 20 mA ( < 600 Ohm 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

RS232, RS485, Modbus RS485, USB, USB-to-RS485 converter
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

Duty Cycle Flow Graph

Applications

Duty Cycle Mode

Duty cycle graph 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 measurement 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 (shown below the Ordering Guide).

  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 85-264 Vac
Isolated 12-32 Vac or 10-48 Vdc
NC
$30
Relay
Output
None
Two 8A Contact Relays
Two Solid State Relays
Four 8A Contact Relays
Four Solid State Relays
NC
$80

$55

$100
$75
Analog
Output
None
Single isolated 4-20 mA, 0-20 mA, 0-10 V, -10 to +10V
Dual isolated 4-20 mA, 0-20 mA, 0-10V
NC
$90
$135
Digital
Interface
None
Isolated RS-232
Isolated RS-485
Isolated Modbus RS-485
USB
USB Cable, A to B
NC
$60

$80

$90

$60

$100
Input
Type
FR  Dual-Channel Pulse Input Signal Conditioner  NC
Add-on
Options
BL  Blank lens without button pads
CBL01  RJ11-to-DB9 cable
CBL02  USB-to-DB9 adapter
CBL05 
USB Cable, A to B
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
NC
$19

$39

$15

$40

$140

$180
 

Configured model number

L70000FR

Configured price per model

$270

Quantity

1

Extended price

$270

 

 

  

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