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Standard Features
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Description
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.
LTM Series serial output transmitters send data via an isolated serial port, which is user configurable for RS232 or RS485 and full or half duplex operation. Three protocols are user selectable: Modbus RTU, Modbus ASCII, or Micron ASCII. Modbus operation is fully compliant with Modbus Over Serial Line Specification V1.0 (2002). The Micron ASCII protocol allows up to 31 Micron devices to be addressed on the same RS485 data line. It is simpler than the Modbus protocol and is recommended when all devices are Microns. It also allows use of Micron Datalogging Software. Standard features of Micron transmitters include:
Easy Transmitter programming is via Micron's Instrument Setup Software, which runs on a PC under MS Windows. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from Micron (P/N CBL04). |
Pulse Input |
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Signal Sources 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 (typical) ±5 ppm/year |
Stopwatch Operation |
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Timing Modes: With CH A only With CH A tied to CH B With CH A and CH B Timing Interval Timing Resolution Selectable Decimal Time Selectable Clock Time Output Update Gate Time |
+ to + edge, or - to - edge. + to - edge, or - to + edge. + edge of A to + edge of B, + edge of A to - edge of B, - edge to A to - edge of B, - edge of A to - edge of B 1 µs to 999,999 hrs 0.2 µs to 1 hr 999999 H, M or S format with decimal point HH.MM.SS format Gate time + 30 ms Programmable from 10 ms to 199.99 s |
Serial Data Output (standard) |
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Signal levels Data Rates Output Isolation Serial Protocols Devices on RS-485 Line Modbus Addresses Modbus Modes Modbus Compliance |
RS232 or RS485 (half duplex) 300, 600, 1200, 2400, 4800, 9600, 19200 baud 250V rms working, 2.3 kV rms per 1 min test Modbus RTU, Modbus ASCII, Micron ASCII (selectable) 32 max without a repeater. 247 max RTU or ASCII, 2-wire. Modbus over Serial Line Specification V1.0 (2002). |
Transducer Excitation Output (standard) |
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Output levels Output isolation |
5V@100 mA, 10 @120 mA, 24V@50 mA (jumper selectable) 50V from signal ground |
Dual Relay Output (standard) |
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Relay Type Load rating |
Two solid state relays, SPST, normally open, Form A 130 mA at 140 Vac or 180 Vdc |
Analog Output (standard) |
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Output Levels Compliance, 4-20 mA Compliance, 0-10V Output Resolution Output Accuracy Output Isolation |
4-20 mA, 0-20 mA, 0-10 Vdc (jumper selectable) 10V ( 0-500 ohm load ) 2 mA ( 5 kOhm load or higher) 16 bits (65,536 steps) 0.02% of output span plus conversion accuracy 250V rms working, 2.3 kV rms per 1 minute test |
Power Input |
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Standard power Low power option Power frequency Power isolation Power consumption |
85-264 Vac or 90-300 Vdc (DC operation not UL approved) 10-48 Vdc or 12-30 Vac DC or 47-63 Hz 250V rms working, 2.3 kV rms per 1 min test 2W typical, 3W with max excitation output |
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 |
Environmental |
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Operating Temperature Storage Temperature Relative Humidity Protection Cooling Required |
0°C to 55°C -40°C to 85°C 95% at 40°C, non-condensing NEMA-4X (IP-65) when panel mounted Mount transmitters so that ventilation holes are at top and bottom. Leave 6 mm (1/4") between transmitters, or blow air by means of a fan. |
| Instrumenting a Pulsed Laser System |
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The Micron Modbus & serial output stopwatch transmitter transmits the time of single events which produce start and stop pulses, or accumulated time of multiple events. It can also time the width of a single pulse. 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 analog output is updated continuously during timing. There are two primary timing modes: 
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 24V dc excitation supply can power proximity switches and other sensors, and eliminate the need for an external power supply.
