Micron Digital Stopwatch & Timer

Standard Features

• Times single events from 1 µs to 999,999 hrs
• Timing resolution to 0.2 µs
• Selectable display of single event time or accumulated time of all events
• 6-digit red or green LED display
• Selectable H, M or S decimal format
• Selectable HH.MM.SS clock format
• 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
• External controls for reset, meter hold and decimal points
• Isolated 5, 10 or 24 Vdc excitation output to power sensors
• Universal AC power, 85-264 Vac
• NEMA 4X, 1/8 DIN case
• Certified to UL 61010C-1 (UL mark), EN 61010-1 (CE mark), and RoHS
  
  Options:
• Low voltage power: 10-48 Vdc or 12-30 Vac
• Dual or quad relays: Form C contact or Form A solid state
• Analog output: Isolated, 4-20 mA, 0-20 mA, 0-10V, -10 to +10V
• Serial communications: RS232, RS485, Modbus RS485, USB, USB-to-RS485 converter

Description

The Micron stopwatch meter is designed to time single events, such as sporting events or processes, which produce start and stop pulses. It can also time the width of a single pulse. Highest resolution is 0.2 µs, since timing is achieved by counting 5.5 MHz clock pulses. For long intervals, the display is updated continuously during timing. Micron stopwatch timers use the FR dual-channel signal conditioner and Standard counter main board.

• A-A Stopwatch Mode. Time can be 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 can also be 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.

Display. The event time (Item #1) may be displayed H, M or S format with six-digit resolution. The longest single-event timing interval is 999,999 hours. The highest resolution is 0.2 µs. The event time may also be displayed in HH.MM.SS clock format with 1 s resolution. The stopwatch display is updated during timing at a rate controlled by a gate time, up to 25/s. It is reset to zero when the next start pulse occurs. Accumulated time from multiple events (Item #2) is also tracked and may be displayed up to 999,999 hours.

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.

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.

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)

Some of the many possibilities in instrumenting a pulsed laser system with Micron dual-channel counters: elapsed time, number of pulses, pulse width, pulse separation, duty cycle, and pulse rep rate.