Stopwatch Input 4-20 mA Current Transmitter
Resolution to 0.2 µs. Duration to 999,999 hrs.
DIN Rail mounted, digitally programmable.
- Isolated 4-20 mA or 0-10V transmitter outputs, selectable.
- Times single event time or accumulated time of all events.
- Timing duration to 999,999 hrs.
- Timing duration to 999,999 hrs
- Triggers on positive or negative pulse edges.
- DIN rail mount package only 22.5 mm thick.
- Easy setup using Laurel's PC-based Instrument Setup Software.
- Inputs from NPN or PNP proximity switches, contact closures, digital logic, or magnetic pickups down to 12 mV.
- Timing resolution to 0.2 µs.
- Output accuracy: ±0.05% of span.
- Optional dual solid state relays for alarm or control.
- Output resolution: 0.025% of span (12 bits).
- Detachable screw clamp plug connectors
The Laureate TM Series serial output stopwatch transmitter performs all of the functions of the Laureate panel mount stopwatch, except for the display. The data retrieved via serial commands can be the time of individual events (Item #1) which produce start and stop pulses, or accumulated time of multiple events (Item #2). The highest resolution is 0.2 µs, making the transmitter ideal for fast events. The longest timing interval is 999,999 hrs. For long events, the output is updated continuously during timing. There are two primary timing modes:
A-A Stopwatch Mode. Time is measured between a start pulse and a stop pulse, both on Channel A, from either the positive or negative edges.
A-B Stopwatch Mode
. Time is measured between a start pulse on Channel A (positive or negative edge) and a stop pulse on Channel B (positive or negative edge). This mode allows inputs from different sources. In addition, the A and B inputs can be tied together to start the stopwatch with one polarity and stop it with the other polarity.
Event time (Item #1) is measured by counting 5.5 MHz clock pulses from a calibrated quartz crystal. The stopwatch output is updated during timing at a rate controlled by a gate time, up to 25/sec. Time is reset to zero when the next start pulse occurs. Accumulated time from multiple events up to 999,999 hours (Item #2) can also be tracked.
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.
The analog transmitters output can be selected as 4-20 mA or 0-10V, and is isolated to avoid ground loops. The output is generated by an ultra-linear 12-bit (4096 step) digital-to-analog convert (DAC), whose span can be adjusted from 0 to ±999,999 internal counts and zero can be adjusted from -999,999 to +999,999 internal counts. The analog output has a rated accuracy of ±0.05% of output span.
East to Set Up and Install
Transmitter programming is via a three-terminal RS-232 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).
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 plug connectors.
||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).
||1 MHz, 30 kHz, 250 Hz (selectable).
||0, 3, 50 ms (selectable).
|Time Base Accuracy
||Quartz crystal calibrated to ±2 ppm.
||±1 ppm/°C (typ)
|Transducer Excitation Output (standard)
|Jumper Selection 1
||10V @ 60 mA, isolated to 50V from signal ground
|Jumper Selection 2
||5V @ 50 mA, isolated to 50V from signal ground
|Jumper Selection 3
||15V @ 60 mA, non-isolated
|Dual Relay Output (optional)
||Two solid state relays, SPST, normally open, Form A
||120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance.
|Analog Output (optional)
||0-20 mA, 4-20 mA or 0-10 Vdc (selectable)
|Compliance, 4-20 mA
||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
||95-240V AC ±10% or 90-300V DC
|Low power option
||12-30V AC or 10-48V DC
||DC or 47-63 Hz
||250V rms working, 2.3 kV rms per 1 min test
||120 x 101 x 22.5 mm
||35 mm rail per DIN EN 50022
||Detachable screw clamp plug connectors
||0°C to 70°C
|| -40°C to 85°C
||95% at 40°C, non-condensing
The stopwatch mode is used to time single events between start and stop pulses on the same channel. Duration of a single wave shape can be measured by tying the A and B channels together.
Timing Process Dynamics
The start and stop pulses used for timing can be generated by the dual relays in a Laureate panel meter, counter, or transmitter. For instance, the start and stop pulse edges can be created as temperature passes two alarm setpoints, or as temperature cycles in a hysteresis control mode.
Replacing an Oscilloscope with a Laureate Meter or Transmitter
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 or transmitter will be the instrument of choice. Resolution to 0.2 µs is feasible.
Instrumenting a Pulsed Laser System
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.
Pinout Laureate 4-20 mA Transmitter
Stopwatch for Single Events or Accumulated Events
(shown with optional analog output and dual relay output)
|Transmitter Powering a Single Sensor
|Transmitter Powering Two Sensors
||Transmitter with Active or Passive Sensors
5672 Bolsa Avenue Huntington Beach, CA 92649 - USA - Ph (714) 622-2000 - Fax (714) 622-2001