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Laurel Electronics provides
digital panel meters / controllers, totalizers, counters, loop-powered meters,
temperature meters, for all types of transducers or process indication &
control. |
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Laureate™
Phase Angle & Duty Cycle Meter
For offset
in degrees & On or Off period in percent
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Features |
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Common
Features |
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. |
NEMA
4X (IP-65) front panel, 1/8 DIN case. |
Uses
Standard counter main board and FR signal conditioner. |
Optional
dual relays, 4-20 mA & 0-10 V analog output, RS-232/485,
and parallel BCD output. |
Certified
to UL 3101-1, CAN/CSA-C22.2, EN 61010-1 (CE Mark). |
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Phase
Angle Mode |
Measures
phase angle between two waveshapes of similar period |
Resolution
of 1º, 0.1º or 0.01º. |
.01%
accuracy at AC line frequency |
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Duty
Cycle Mode |
Measures
ON or OFF period as a percentage of total period. |
Resolution
of 1%, 0.1% or 0.01%. |
Click
to Order Phase Angle & Duty Cycle Meter
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Description |
| The
Laureate™ phase angle
and duty cycle meters both use the FR dual-channel signal
conditioner board and the Extended counter main board.
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| Phase
Angle Mode |
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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. The Laureate phase angle meter provides
exceptionally fast response and six-digit 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. |
| Duty
Cycle Mode |
Universal
Signal Conditioner |
| Duty
cycle is a measure of ON or OFF period as a percentage
of total period. As for phase angle, duty cycle is determined
by averaging an integral number of periods over a gate
time which is selectable from 10 ms to 199.99 s. The
same signal is applied to Channels A and B. The meter
divides the average pulse width by the period between
pulses and expresses this ratio in percent. A resolution
of 1%, 0.1% or 0.01% is selectable. By selecting leading
or falling pulse edges, the ON or OFF duty cycle can
be displayed.
Duty cycle measurement is used to monitor modulated
proportional control systems and pulse-modulated systems,
such as radar, lasers or packet radio. For long periods,
duty cycle can be measured by using the A and B channels
of the Laureate dual-channel counter to totalize AC
line cycles and having the counter display the ratio
of the two totals scaled to percent. |
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. Nine hysteresis and signal levels
are jumper selectable for reliable triggering. A 1600
Hz low-pass rolloff filter for noise reduction and contact
debounce times of 3 ms or 50 ms are also selectable
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 & Options |
| Plug-in
isolated analog output, dual setpoint controller and
RS232/485 communi- cations or BCD output boards can
upgrade a Laureate from a stand-alone monitor to system
interface and control. Laureate meters and counters
meet NEMA 4X (IP-65) standards from the front for high
pressure washdown when panel mounted. |
Click
to Order Phase Angle & Duty Cycle Meter
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| Phase
Angle Mode |
Duty
Cycle Mode |
Item
Displayed |
Phase
angle difference between two waves of same period |
Item
Displayed
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ON
or OFF duty cycle of periodic pulse waveshape |
Display
Units |
1°,
0.1°, 0.01° |
Display
Units |
1%,
0.1%, 0.01% |
Frequency
Range |
.005
Hz to 10 kHz |
Frequency
Range |
.005
Hz to 50 kHz |
Accuracy |
01°,
.005 Hz to 100 Hz, .1° at 1 kHz, 1° at 10 kHz |
Accuracy |
.01%,
.005 Hz to 500 Hz, .1% at 5 kHz, 1% at 50 kHz |
Maximum
Timing Interval |
200
s |
Maximum
Timing Interval |
200
s |
| Display |
Excitation
Output |
Readout |
6
digits, 7-segment, 14.2 mm (.56") |
5
Vdc |
5
Vdc ±5%, 100 mA max |
Color |
Red
or green LED |
10
Vdc |
10
Vdc ±5%, 120 mA max |
Range |
-99999
to +99999 |
24
Vdc |
24
Vdc ±5%, 50 mA max |
Indicators |
4
red LED lamps |
Output
isolation |
50
Vdc to meter ground |
Electrical
Connections |
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| Environmental |
Power |
Operating
Temperature |
0°C
to 55°C |
Voltage,
std.
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85-264
Vac and 90-370 Vdc
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Storage
Temperature |
-40°C
to 85°C |
Frequency
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DC
or 49-440 Hz
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Relative
Humidity |
95%
at 40°C, non-condensing |
Voltage,
opt. |
8-28
Vac and 9-37 Vdc
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Protection |
NEMA-4X
(IP-65) when panel mounted |
Power
isolation |
Safety-rated
to 250 Vac, meter ground to earth ground,
DC to 60 Hz, 4.2 kVp per High Voltage Test |
Inputs |
Types
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AC,
pulses from NPN, PNP transistors, contact closures,
magnetic pickups |
Selectable
Hysteresis |
(-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),
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Signal
ground |
Common
ground for channels A & B |
Debounce
Time |
Selectable,
none or 1600 Hz
Selectable 0, 3, 50 ms |
Rolloff
Filter |
(-2.1
V to -1.25 V) |
| Timing
Interval |
Periodic
Timing Interval |
Gate
time + 30 ms + 0-2 signal periods |
Gate
Time |
Selectable
10 ms to 199.99 s |
Timeout |
Selectable
10 ms to 199.99 s |
Output
& Display Update |
Same
as period timing interval |
Click
to Order Phase Angle & Duty Cycle Meter
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Applications |
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Phase
Angle Mode |
Duty
Cycle Mode |
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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 |
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Duty
cycle indicates the ON or OFF time in percent from
0% to 100% of period for repetitive pulse train.
In the illustration, duty cycle is 100 x t / P.
The same signal is applied to the A and B channels. |
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Duty
Cycle and Elapsed Time of a Laser |
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Duty
cycle can be used to indicate the ON time of a pulsed
laser in relation to total time. Laureate counters
can also measure elapsed time, the number of pulses,
average width in µs, the number of pulses, and total
energy applied.
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Using Laureate Meters and
Counters to Synchronize Motor Generators |
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| 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 Laureate dual channel counter
measures both frequencies to six-figure accuracy
in a few line cycles. Another Laureate dual channel
counter measures phase angle to 0.1º resolution.
Two Laureate 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. |
Click
to Order Phase Angle & Duty Cycle Meter
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FLW,
Inc - 3505
Cadillac Ave - Bldg E - Costa Mesa, CA. - 92626 - USA - Ph (714) 751 -
7512 - Fax (714) 751 - 0213
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