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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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Time
Interval of Periodic Events Modbus or Laurel ASCII Protocol Serial I/O Transmitter
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From from 1 µs to 199.999 s. Resolution to 0.2
µs. DIN Rail mounted, digitally programmable.
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Click
to Order Time Interval of Periodic Events Transmitters
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Features
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Selectable Modbus or Laurel ASCII protocol. |
Modbus
RTU or ASCII modes, 2-wire connection, up to 247 digital
addresses. |
| For
periodic events with width from 1 µs to 199.999 s. |
Transmitted
6-digit decimal reading. |
| Resolution
to 0.2 µs. |
Rep
rated to 250 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. |
Trigger
on positive or negative pulse edges. |
| Isolated
5V, 10V or 15V dc excitation output to power
transducers. |
DIN
rail mount package only 22.5 mm thick. |
| 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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 Average
Time of Periodic Events
The
Laureate TM Series serial output transmitter for
periodic time events can transmit pulse width or
time delay between individual pulses to a
resolution of 0.2 µs. It can also display average
pulse width or average time delay between multiple
pulses. Selectable full-scale ranges go from
0.099999 sec with 0.2 µs resolution (after
averaging) to 199.999 sec with 1 ms resolution.
Time
interval is measured between inputs on channels A
and B. Timing starts when a pulse is applied to Channel
A (selectable positive or negative edge), and ends
when a pulse is applied to Channel B (selectable
positive or negative edge). In case of a single
pulsed signal, the A and B inputs can be tied
together. A positive or negative slope may be
selected to start timing, and the opposite slope
must be selected to stop timing. Timing is
achieved by counting 5.5 MHz clock pulses.
Multiple integral time intervals are averaged over
a gate time which is selectable from 10 ms to
199.99 s and also controls the maximum output
rate.
 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
isolated 5V, 10V or 15V dc excitation supply can
power proximity switches and other sensors, and
eliminate the need for an external power supply.
Serial
Data I/O & Programming
Laureate
TM Series transmitters send data as a serial
digital signal. RS485 or RS232 signal levels are
jumper selectable and can each be associated with
either the Modbus protocol or Laurel’s simpler
Laurel ASCII protocol.
- Modbus
protocol operation
is fully compliant with the Modbus Over Serial
Line Specification V1.0 (2002) for 2-wire,
half-duplex connection. This includes RTU or
ASCII modes, addressing of up to 32 devices per
RS485 line without a repeater, and up to 247
digital addresses. Modbus operation allows
devices by different manufacturers to be
connected in parallel and be addressed using the
same protocol.
- Laurel’s
Laurel ASCII protocol
allows up to 31 Laureate devices to be addressed
on the same RS485 data line. It is simpler than
the Modbus protocol and is recommended when all
devices are Laureates. It also allows use of
Laurel’s datalogging software.
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.
Transmitter
Options
Options
include dual solid state relays for local alarm or
control and an isolated 4-20 mA or 10V
(selectable) analog output, effectively providing
a linearized analog transmitter output that tracks
the reading that would be transmitted digitally.
The analog output provides 12-bit (4096 step)
resolution of the output span and is ultra-linear
to within one bit. Its accuracy is ±0.05% of span
for all signal types, except for AC rms, where
accuracy is ±0.1%. Output isolation from signal
and power grounds is provided by a separate
on-board power supply, which can drive 20 mA into
a 500 ohm load for 10V compliance. Output
isolation eliminates problems caused by ground
loops.
DIN
Rail Mounting
Laureate
transmitters are housed in a 35 mm DIN rail case
that is only 22.5 mm (0.89") thick. Signal
connections are via detachable screw clamp plug
connectors.
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Click
to Order Time Interval of Periodic Events Transmitters
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General
Specifications
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Pulse Input |
Types
Ch A Frequency, Max
Ch B Frequency, Max
Signal Ground
Minimum Signal
Maximum Signal
Maximum Frequency
Contact Debounce
Time Base Accuracy
Span Tempco
Long-term Drift |
AC, pulses from NPN, PNP
transistors, contact closures, magnetic pickups.
1 MHz.
250 kHz.
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).
Quartz crystal calibrated to ±2 ppm.
±1 ppm/°C (typ)
±5 ppm/year |
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Time Interval Mode |
Timing Start
Timing Stop
Periodic Timing Interval
Gate Time
Time Before Zero Output |
Channel A pulse, + or - edges
Channel B pulse, + or - edges
Gate time + 30 ms + 0-2 time intervals
Selectable 10 ms to 199.99 s
Selectable 10 ms to 199.99 s |
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Resolution |
0 - 199.999 s
0 - 99.9999 s
0 - 9.99999 s
0 - .999999 s
0 - .099999 s |
1 ms
100 µs
10 µs
1 µs
0.2 µs (after averaging) |
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Serial I/O (standard) |
Signal levels
Data Rates
Output Isolation
Serial Protocols
Devices on RS-485 Line
Modbus Addresses
Modbus Modes
Modbus Compliance |
RS485 (default) or RS232 (jumper selectable)
300, 600, 1200, 2400, 4800, 9600, 19200 baud
250V rms working, 2.3 kV rms per 1 min test.
Modbus RTU, Modbus ASCII, Laurel ASCII (selectable)
32 max without a repeater.
247 max
RTU or ASCII, 2-wire.
Modbus over Serial Line Specification V1.0 (2002). |
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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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Application
Example
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Time
Interval Mode for Time Delay
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For periodic pulses applied to A
and B channels, time delays can be measured down to 0.2 µs
resolution from the rising or falling edge of A to the rising or
falling edge of B (selectable). |
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Time
Interval Mode for Pulse Width
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The width of periodic pulses (t1
or t2) can be measured by tying the A and B channels together. As
for time delay, readings are averaged over a user-selectable gate
time. |
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Timing
Process Dynamics with a Panel Meter and Time Interval Meter
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The start and stop pulses used for
timing can be generated by the dual relay board in a Laureate
panel meter or digital counter. For instance, the start and stop
pulse edges can be created as temperature passes two alarm
setpoints, or temperature cycles in a hysteresis control mode. |
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Replacing
an Oscilloscope with a Laureate Time Interval Meter
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An oscilloscope is great for
viewing and timing pulses in a lab. However, in fixed
installations where digital timing accuracy and control outputs
are required, a low-cost Laureate time interval meter will be the
instrument of choice. Resolution to 0.2 µs is feasible. |
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Instrumenting
a Pulsed Laser System
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Some of the many
possibilities in instrumenting a pulsed laser system with
Laureate dual-channel counters and transmitters: elapsed time,
number of pulses, pulse width, pulse separation, duty cycle,
and pulse rep rate.
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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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