Features

• Available in three digit heights: 0.56" for panel mounting, 1.0" (Mighty-1) or 5.0" (Mighty-5) for long-distance viewing.
• Measures phase angle between two waveshapes of similar period
• Resolution of 1º, 0.1º or 0.01º.
• .01% accuracy at AC line frequency
• 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.
• Frequency from .005 Hz to 10 kHz.
• 6-digit red or green LED display.
• Isolated 5, 10 or 24 Vdc excitation output to power sensors.
• Uses Standard counter main board and FR signal conditioner.
• Choice of isolated plug-in options for control and computer interface:
  dual relays, 4-20 mA & 0-10 V analog output, RS-232/485 serial I/O, low voltage AC & DC power
• 1/8 DIN case environmentally sealed to NEMA-4X from front panel.
• 1/8 DIN version certified to UL 3101-1, CAN/CSA-C22.2, EN 61010-1 (CE Mark).

Description

Phase Angle Measurement

Phase angle measurement requires that two signals with identical periods be applied to Channels A and B. A display from -180º to +180º is obtained by timing the rising edge of one channel and the falling edge of the other channel, and programming a 180º offset. A resolution of 1º, 0.1º or 0.01º is selectable. Accuracy is 0.01% up to 100 Hz, 0.1% at 1 kHz, and 1% at 10 kHz.

Phase angle measurement is commonly used with AC power from 50 Hz to 400 Hz. Phase angle needs to be set to zero to synchronize AC generators. It also applies to the triggering of SCRs and Triacs for power control. The phase angle between AC current and voltage determines power factor. Micro Series phase angle meters provide exceptionally fast response and high accuracy for low frequencies, such as AC line frequency.

Phase angle is determined by timing crystal clock pulses over a specified gate time which is selectable from 10 ms to 199.99 s. By selecting the minimum gate time of 10 ms, the update rate can be up to 20/s for 50/60 Hz AC line frequency. Improved accuracy is obtained by making the gate time long enough so that multiple cycles can be averaged.

Micro phase angle meters use the FR dual-channel signal conditioner board and Extended counter main board.

Universal Signal Conditioner

The dual-channel signal conditioner accepts inputs from proximity switches with PNP or NPN output, TTL or CMOS logic, magnetic pickups, contact closures, and AC 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.

Built-in Flexibility

Plug-in isolated analog output, dual setpoint controller, and RS-232/485 serial communications boards can upgrade Micro and Mighty Series phase angle meters from a stand-alone monitor to system interface and control.

Micro Series meters can be powered from 95-240 Vac ±10% and 95-370 Vdc, or optionally from 12-34 Vac and 10-48 Vdc. Any setup functions and front panel keys may be locked out for simplified usage and security. The popular 1/8 DIN version with 0.56" high digits is environmentally sealed to NEMA-4X (IP65) from the front when panel mounted, and is available with red or green LEDs.

Phase angle difference between two waves of same period
1°, 0.1°, 0.01°
.005 Hz to 10 kHz
.01°, .005 Hz to 100 Hz, .1° at 1 kHz, 1° at 10 kHz
200 s

AC, pulses from NPN, PNP transistors, contact closures, magnetic pickups
Common ground for channels A & B
-12 mV to +12 mV, +30 mV to +60 mV, -30 mV to -20 mV,
-150 mV to +150 mV, +350 mV to +600 mV, -600 mV to -350 mV,
-1.15 V to +1.15 V, +1.25 V to +2.1 V, -2.1 V to -1.25 V
Selectable: 1 MHz, 30 kHz,  250 Hz
Selectable: 0, 3, 50 ms

Gate time + 30 ms + 0-2 signal periods
Selectable 10 ms to 199.99 s
Selectable 10 ms to 199.99 s
Same as period timing interval

Phase Angle Mode

Phase angle indicates the lead or lag in degrees from 0º to 360º between two periodic signals having the same frequency. In the illustration, phase angle is 360*P1/P. The signals are applied to the A and B input channels.

Using Micro Meters and Counters to Synchronize Motor Generators

Synchronization of two motor generators requires that the two frequencies be identical, that the lines be in phase, and that the line voltages be close to each other. In this illustration, a single Micro dual channel counter measures both frequencies to six-figure accuracy in a few line cycles. Another Micro dual channel counter measures phase angle to 0.1º resolution. Two Micro AC RMS Voltmeters, which offer ranges of 200.00 V and 660.0 V, are used to display the two RMS voltage to 0.1% accuracy.