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Micron Duty Cycle Meter

For display of ON or OFF period in percent

Duty Cycle Meter
CE Mark
  
UL Mark
RoHS Mark
Made in California

Standard 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 0.005 Hz to 10 kHz.
  • 6-digit red or green LED display.
  • Isolated 5, 10 or 24 Vdc excitation output to power sensors.
  • Certified to UL 61010C-1 (UL mark), EN 61010-1 (CE mark), and RoHS

    Options:
  • Low voltage power: 10-48 Vdc or 12-30 Vac
  • Dual or Quad relays: Form C contact or Form A solid state
  • Analog output: Isolated, 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 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 Micron dual-channel counter to totalize AC line cycles and having the counter display the ratio of the two totals scaled to percent.

Circuit Board for Duty Cycle MeterThe Micron 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

Microns may be powered from 85-264 Vac 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
85-264 Vac 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 (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 (jumper selectable)
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 or Quad Contact Relay Outputs (optional)
Relay Type
Load Rating
Isolation
Form C, SPDT
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
Form A, SPST, normally open
130 mA at 140 Vac or 180 Vdc
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 Micron ASCII
300 to 19200 bps
247 (Modbus), 31 (Micron 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 Mode 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 Batch Controller
Duty cycle can be used to indicate the ON time of a pulsed laser in relation to total time. Micron counters can also measure elapsed time, the number of pulses, average width in µs, the number of pulses, and total energy applied.
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