42213 Sarah Way, Temecula, CA 92590,
Tel: 800-854-8530 (USA)
Micro Series Quadrature
& Rate Meters
For accurate position or rate from quadrature
- Available in three digit heights:
0.56" for panel mounting,
5.0" (Mighty-5) for
- Accepts low-level differential or single-ended 5 V logic
level outputs from shaft encoders.
- Quadrature count x1, x2 or x4.
- Combined pulse rate to 250 kHz.
- Programmable display refresh rate up to
- Zero channel input.
- 6-digit display scalable for direct
readout in units of length.
- Isolated 5, 10 or 24 Vdc excitation
output to power shaft encoder.
- AC or DC powered.
- Green or red LED display.
- Extended counter option to display rate
- Choice of isolated plug-in
options for control and computer interface:
4-20 mA & 0-10
V analog output,
RS232/485 serial I/O,
low voltage AC & DC power.
version 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).
Position, Length or Angle
meters with the Standard counter main board accept the A & B signals from shaft
encoders to provide a highly accurate, scaled display of position, length, or angle in
engineering units, such as ft, cm or degrees.
The A & B quadrature signals are 90º out
of phase, and their phase relationship determines whether up counts (+) or down counts (-)
are produced. The meter totalizes the counts and then scales the total in soft-ware for
display and control. A zero index signal may be added as a third input to the A & B
Scaled Rate Measurement
Use of the Extended
counter main board can convert the quadrature meter from scaled position to scaled rate.
For example, it can display the speed of a moving slab in ft/sec. Simultaneous display of
position and rate will require two meters. The display and control output update rate
for position or rate is normally set to a maximum of 25/s, as determined by a
user-programmable gate time.
Quadrature Meter Capabilities
One, two or four
transitions may be counted at a maximum combined rate of 250 kHz and be
mathematically scaled for display in engineering units from -999,999 to +999,999. The quadrature board has input circuitry which may be jumpered for
either single-ended input signals or for balanced line driver signals. Anti-jitter
circuitry eliminates errors produced by vibration of the encoder.
A zero index pulse,
if available, is interpreted as by the meter as corresponding to an integral number of
revolutions of the shaft encoder. It is used by the meter to correct for any cumulative
pulse count errors. Special circuitry corrects for width of the zero index pulse.
In the event
of a power failure, the current total may be stored in non-volatile memory and
can be used as the starting point for counting when power resumes. Power fail or zero index capabilities are alternate meter setup
A built-in isolated 5,
10, or 24 Vdc excitation supply can power the encoder and eliminate the need for an
external power supply. Plug-in isolated analog output,
RS232/485 serial communications boards can upgrade Micro
and Mighty Series quadrature meters from
stand-alone monitor to system interface and control. In particular, the meter can provide
an isolated 4-20 mA output signal scaled to the display.
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
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.
Display Update Rate
6 digits, 7-segment
Available with 0.56", 1.0", 4.0" or 5.0" digits.
High brightness red. Green available with 0.56" digits.
-999999 to +999999
Programmed gate time + 30 ms + 1-2 signal periods
Four LED lamps
Max Pulse Rate
or single-ended quadrature
x1, x2 or x4
250 kHz at x1, 125 kHz at x2, 62.5 kHz at x4
No error contributed by meter
Output & Display Update
Time Base Accuracy
+ 30 ms + 0-2 signal periods
Selectable 10 ms to 199.99 s
Selectable 10 ms to 199.99 s
Same as conversion time
Calibrated to ±2 ppm
±1 ppm/°C (typ.)
95-240 Vac ±10% and 95-370 Vdc
12-34 Vac and 10-48 Vdc
DC or 49-440 Hz
Safety-rated to 250 Vac, meter ground to earth ground,
DC to 60 Hz, 4.2 kVp per High Voltage Test
Vdc ±5%, 100 mA max
10 Vdc ±5%, 120 mA max
24 Vdc ±5%, 50 mA max
50 Vdc to meter ground
0°C to 60°C
-40°C to 85°C
95% at 40°C, non-condensing
NEMA-4X (IP-65) when panel mounted
Using Quadrature for Cutting to Length
Controlling the repetitive cutting of
material to length is an excellent application of the Micro quadrature meter.
The quadrature encoder shares the shaft of a
sensing wheel, whose rotation corresponds to lineal displacement of material. The meter
compares the displacement reading against setpoint information, and then uses its dual
relays to first slow down and then cut the material.
Using Quadrature for X-Y Positioning
Accurate X-Y position or rate can be
obtained from two shaft encoders, which convert linear position to quadrature signals as a
shaft turns. In addition to serving as a display, each Micro quadrature
meter can use its optional dual
relay setpoint capability for closed loop control. It can also transmit data via RS232,
RS485, or a 4-20 mA analog signal.
Using Quadrature to Monitor a Drilling Operation
Quadrature can be used to track position
and vertical drilling speed of the bit in an oil drilling operation. A shaft encoder is
rotated by a cable that moves with the drilling shaft.
In this application, the same encoder signal
is applied to a Micro quadrature meter for position, and to a second quadrature meter
for rate. Both meters can be scaled to read out in appropriate engineering units, such as
feet and inches per minute, and can be alarmed. A Micro 6-digit remote display could be
added to read out peak rate.
Micro & Mighty Series Downloads