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Standard Features
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Description
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 display update time. Time interval can be displayed in seconds, milliseconds, or microseconds with 6-digit resolution. In the typical application, time is displayed in milliseconds with 1 µs resolution. For times less than 100 ms, display resolution down to 0.2 µs can be achieved by applying a multiplier of 10, moving the decimal point by one position, and averaging many time intervals.
Other Features and Options. Plug-in isolated analog output, dual or quad setpoint controller and serial communications option boards can upgrade the Micron from a stand-alone monitor to system interface and control. The 1/8 DIN case of Micron meters and counters meets NEMA 4X (IP-65) standards from the front for high pressure wash-down when panel mounted. |
Display |
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Readout Range Indicators |
6 LED digits, 7-segment, 14.2 mm (.56"), red or green. -999999 to +999999 Four LED lamps |
Inputs |
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Types Grounding Channel A Frequency Channel B Frequency Minimum Signal Maximum Signal Noise Filter Contact Debounce |
AC, pulses from NPN, PNP transistors, contact closures, magnetic pickups Common ground for channels A & B 0.005 Hz to 1 MHz 0.005 Hz to 250 kHz 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) |
Time Interval Mode |
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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 |
Resolution |
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0 - 199.999 s |
1 ms 100 µs 10 µs 1 µs 0.2 µs |
Accuracy |
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Time Base Span Tempco Long-term Drift |
Crystal calibrated to ±2 ppm ±1 ppm/°C (typ) ±5 ppm/year |
Power |
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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) |
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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) |
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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) |
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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 or Quad Solid State Relay Outputs (optional) |
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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) |
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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 |
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Operating Temp. Storage Temp. 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 |
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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). |
| 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. |
| 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 Micron 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. |
| Replacing an Oscilloscope with a Micron 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 Micron time interval meter will be the instrument of choice. Resolution to 0.2 µs is feasible. |
| Instrumenting a Pulsed Laser System Using Micron Counters |
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The FR dual-channel signal conditioner board 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 5, 10, or 24 Vdc excitation supply can power proximity switches and other sensors, and eliminate the need for an external power supply.
