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Laurel Electronics
provides digital panel meters / controllers, totalizers, counters,
loop-powered meters, temperature meters, for all types of
transducers or process indication & control. |
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Duty
Cycle Input 4-20 mA
Current Transmitter
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Transmits ON or OFF period in percent.
DIN Rail mounted, digitally programmable.
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Click
to Order Transmitter for Duty Cycle Input Signals
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Features
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| Isolated
4-20 mA or 0-10V transmitter outputs, selectable. |
| Transmits
ON or OFF period
as a percentage of total period. |
Resolution
of 1%, 0.1% or 0.01%. |
| Frequencies
from .005 Hz to 10 kHz. |
Inputs
from NPN or PNP proximity switches, contact closures,
digital logic, magnetic pickups down to 12 mV, or AC
inputs up to 250 Vac. |
| Triggers
on positive or negative pulse edges. |
5V,
10V or 15V dc excitation output to power sensors. |
| DIN
rail mount package only 22.5 mm thick. |
Detachable
screw clamp plug connectors. |
| Easy
setup using Laurel's PC-based Instrument
Setup Software. |
Optional dual solid state
relays for alarm or control. |
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Description
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The
4-20 mA output of the Laureate duty
cycle transmitter
tracks ON or OFF period as a percentage
from 0% to 100% of total period of
repetitive pulse trains. In the
illustration, duty cycle is 100 x t/P.
The transmitter determines duty cycle 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
transmitted.
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.
 Universal
Signal Conditioner
The
dual-channel signal conditioner used for
pulse detection accepts inputs from
proximity switches with PNP or NPN
output, TTL or CMOS logic, magnetic
pickups, contact closures, and other
signals from 12 mV to 250 Vac. Jumper
selections provide optimum operation for
different sensor types and noise
conditions. A built-in 5V, 10V or 15V dc
excitation supply can power proximity
switches and other sensors, and
eliminate the need for an external power
supply.
The
4-20 mA analog output is generated by an
ultra-linear 12-bit (4096 step)
digital-to-analog convert (DAC) whose
output span can be adjusted from 0 to ±999,999
counts and zero can be adjusted from
-999,999 to +999,999 counts. The analog
output has a rated accuracy of ±0.05%
of output span. The output update rate
for a minimum timing interval is 20/sec
at AC line frequencies
Transmitter
programming is
via the unit's three-terminal serial
port using Laurel's PC-based Instrument
Setup Software. This software can be
downloaded from this website at no
charge. The required transmitter-to-PC
interface cable is available from Laurel
(P/N CBL03). Laurel's serial output
transmitters and meters can also be part
of PC-based data logging systems using
Laurel's Datalogging
Software, which operates under the
Laurel ASCII Protocol. A single software
command switches between the Modbus and
Laurel ASCII Protocols.
The
transmitters are housed in a DIN rail
case that is only 22.5 mm (0.89")
thick. Signal connections are via
detachable screw clamp connectors.
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Click
to Order Transmitter for Duty Cycle Input Signals
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General
Specifications
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Pulse Input |
Types
Grounding
Minimum Signal
Maximum Signal
Noise Filter
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). |
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Duty Cycle Mode |
Item Displayed
Display Units
Frequency Range
Input Accuracy
Maximum Timing Interval |
ON or OFF duty cycle of periodic pulse
waveshape
1%, 0.1%, 0.01%
0.005 Hz to 50 kHz
0.01%, 0.005 Hz to 500 Hz, 0.1% at 5 kHz, 1% at 50 kHz
199.99 s |
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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 |
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Transducer Excitation
Output (standard) |
Jumper Selection 1
Jumper Selection 2
Jumper Selection 3 |
10V @ 60 mA, isolated to 50V from signal
ground
5V @ 50 mA, isolated to 50V from signal ground
15V @ 60 mA, non-isolated |
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Dual Relay Output
(optional) |
Relay Type
Load rating |
Two solid state relays, SPST, normally open,
Form A
120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance. |
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Analog Output
(optional) |
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Output Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Isolation |
0-20 mA, 4-20 mA or 0-10 Vdc
(selectable)
10V ( 0-500 ohm load )
2 mA ( 5 kOhm load )
12 bits (4,096 steps)
±0.05% of output span
250V rms working, 2.3 kV rms per 1 minute test |
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Power Input |
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Standard power
Low power option
Frequency
Power Isolation |
95-240V AC ±10% or 90-300V DC
12-30V AC or 10-48V DC
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test. |
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Mechanical |
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Case Dimensions
Case Mounting
Electrical Connections |
120 x 101 x 22.5 mm
35 mm rail per DIN EN 50022
Detachable screw clamp plug connectors |
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Environmental |
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Operating Temperature
Storage Temperature
Relative Humidity |
0°C to 70°C
-40°C to 85°C
95% at 40°C, non-condensing |
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Duty
Cycle and Elapsed Time of a Laser
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Duty cycle can be used to indicate
the ON time of a pulsed laser in relation to total time. Laureate
counters and transmitters 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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FLW,
Inc - 3505
Cadillac Ave - Bldg E - Costa Mesa, CA. - 92626 - USA - Ph (714) 751 -
7512 - Fax (714) 751 - 0213
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