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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™ DC Voltage &
Current Panel Meters
(High
accuracy, high read rate, control outputs)
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Features |
| 0.2,
2, 20, 200 and 660 V ranges. |
2,
20, 200 mA and 5 A ranges. |
| All
ranges factory calibrated. |
99.99%
full scale accuracy. |
| 4
1/2 digit resolution to ±19,999 for direct readout
in mV, V, mA or A. |
1
Gohm input impedance on 200 mV
and 2 V scales. |
| Field
scalable from front panel to ±99,999 for use with
external current shunts. |
Up
to 60 conversions per second. |
| Peak
value display. |
Selectable
adaptive digital filter. |
| Selectable
fixed zero or active least significant digit. |
5,
10 or 24 Vdc excitation supply. |
| NEMA
4X, 1/8 DIN case. |
External
controls for reset, meter hold and decimal points. |
| Choice
of isolated plug-in options for control and computer
interface. |
Certified
to UL 3101-1, CAN/CSA-C22.2, EN 61010-1 (CE Mark). |
Click
to Order DC Panel Meter
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Description |
| Laureate™
DC voltage and current panel meters with a DC signal
conditioner board combine high accuracy with high
read rate and a wide range of isolated output
options for computer interface and control. Accuracy
is 99.99% of full scale ±1 count.
Used as a
direct-reading DC voltmeter, the Laureate provides a
full-scale readout of ±20,000 counts and five
full-scale voltage ranges from 200.00 mV with 10 mV
resolution to 660.0 V with 100 mV resolution. The
200.00 mV and 2.000 V ranges provide a high input
impedance of 1 Gohm so as to minimize the load on
the voltage signal. The maximum voltage which can be
applied on the 20, 200 and 660 Vdc ranges is 660 Vac.
Used as a DC
ammeter, the Laureate provides a full-scale readout
of ±20,000 counts and four full-scale
direct-reading current ranges from 2.0000 mA with
0.1 mA resolution to 5.000 A with 1 mA resolution.
The 5.000 A range measures the IR drop across a
built-in 10 mW current shunt. |
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Use
with External Current Shunts |
| The
Laureate can be used with external current shunts,
which typically produce 50 mV or 100 mV at their
rated maximum current. Scaling from millivolts to
amperes for a specific shunt value
is easily accomplished from the front panel of the
meter. The scalable readout is five full digits up
to ±99,999 counts. Since the voltage signal from a
current shunt can be noisy, the Laureate provides a
selectable, adaptive moving-average digital filter,
as explained below. |
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All
Ranges Precalibrated
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High
Read Rate and Peak Capture
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| All
voltage and current ranges are calibrated at the
factory, with calibration factors for each range
stored in an internal EEPROM. This allows ranges to
be changed without recalibrating the meter. |
All
Laureate voltmeters use Concurrent Slope (US Pat
5,262,780) analog-to-digital conversion, which
allows up to 60 or 50 conversions per second while
integrating the signal over a full power cycle. High
read rate is ideal for peak capture, real-time
computer interface, and control.
The
peak value of the input signal is automatically
captured and may be displayed via a front panel
pushbutton command or a control signal at the rear
connector since the last meter reset. Other controls
at the rear connector include meter hold, meter
reset, and decimal point selection |
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Selectable
Signal Filtering
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The
displayed readings and the data outputs can be
separately selected to be either unfiltered or
filtered.
An
unfiltered selection
updates after each conversion for fastest
response.
A
batch average filter
selection averages each 16 conversions for an
update every 1/4 sec.
An
adaptive moving average filter
selection provides a choice of 8 time
constants from 80 ms to 9.6 s. When a
significant change in signal level occurs, the
filter adapts by briefly switching to the
shortest time to follow the change, then
reverts back to its selected time constant.
Another choice is Auto, which provides an
automatic time constant selection based on the
signal noise characteristics |
| Isolated
Excitation Supply |
Interface
Options |
Built-in
Flexibility & Safety |
| 5,
10 and 24 Vdc isolated excitation outputs are
standard to power external devices, such as
transducers or transmitters. In many cases, these
outputs can eliminate the need for an external
supply |
Plug-in
isolated analog output, dual setpoint controller,
and RS-232, RS-485 communications or BCD output
boards can upgrade the Laureate from a simple
monitor to system interface and control. |
Laureates
may be powered from 85-264 Vac and 90-370 Vdc, or
optionally from 8-28 Vac and 9-37 Vdc. They are
available with red or green LEDs. They are housed in
a 1/8 DIN case that meets NEMA 4X (IP65)
specifications from the front when panel mounted.
Any setup functions and front panel keys may be
locked out for simplified usage and security |
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Click
to Order DC Panel Meter
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Specifications |
| DC
Voltage |
DC
Voltage Range |
Resolution |
Input
Ohms |
Error
at 25°C ±1 count |
| 200.00
mV |
10
µV |
1
G |
0.01%
FS |
| 2.000
V |
100
µV |
1
G |
0.01%
FS |
| 20.000
V |
1
mV |
1
M |
0.01%
FS |
| 200.00
V |
10
mV |
1
M |
0.01%
FS |
| 660.0
V |
100
mV |
1
M |
0.03%
FS |
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| DC
Current |
2.0000
mA |
0.1
µA
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100 |
0.01%
FS |
20.000
mA
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1.0
µA
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10 |
0.01%
FS
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200.00
mA
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10
µA |
1 |
0.01%
FS |
| 5.000
A |
1.0
mA |
0.01 |
0.04%
FS |
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DC
Voltage & Current |
| Display |
A-to-D
Conversion |
| Readout |
5
digits, 7-segment, 14.2 mm (.56") |
Technique |
Concurrent
Slope™ (Pat 5,262,780) |
| Color |
Red
or green LED |
A-to-D
Rate |
60/s
at 60 Hz, 50/s at 50 Hz |
| Range |
-99999
to +99999 or -99990 to +99990 (count by 10 with
rounding) |
Output
Update |
56/s
at 60 Hz, 47/s at 50 Hz
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| Indicators |
Minus
sign, 2 red LED lamps |
Display
Update |
3.5/s
at 60 Hz, 3/s at 50 Hz |
| Accuracy |
Noise
Rejection |
| Span
Tempco |
0.003%
of reading/°C |
CMR,
DC to 60 Hz |
130
dB |
| Zero
Tempco |
0.1
counts/°C |
NMR
at 50/60 Hz |
90
dB with min filtering |
| Maximum
Signal |
Power |
| Max
applied voltage |
660
Vac for 20, 200 and 600 V ranges, 125 Vac for other
ranges
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Voltage,
std.
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85-264
Vac and 90-370 Vdc
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Frequency
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DC
or 49-440 Hz
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| Overcurrent
protection |
25x
for 2 mA, 8x for 20 mA, 2.5x for 200 mA, 1x for 5 A |
Voltage,
opt. |
8-28
Vac and 9-37 Vdc
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| Power
isolation |
Safety-rated
to 250 Vac, meter ground to earth ground,
DC to 60 Hz, 4.2 kVp per High Voltage Test |
| Excitation
Output |
Connector
Pin Assignments |
| 5
Vdc |
5
Vdc ±5%, 100 mA max |
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| 10
Vdc |
10
Vdc ±5%, 120 mA max |
| 24
Vdc |
24
Vdc ±5%, 50 mA max |
| Output
isolation |
50
Vdc to meter ground |
| Environmental |
| Operating
Temperature |
0°C
to 55°C |
| Storage
Temperature |
-40°C
to 85°C |
| Relative
HumidityProtection |
NEMA-4X
(IP-65) when panel mounted |
Click
to Order DC Panel 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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