■
Key to Warning Symbols
■
Attention Symbols
(1) The application of voltage or current exceeding its maximum
allowable value to the input terminals may result in instrument
damage.
(2) The supply of power out of its allowable range may cause fire,
electric shock or instrument failure.
(3) The content of this manual may subject to change without prior
notice for product improvement.
(4) This manual is carefully prepared. However, if any question
arises, or any mistake, omission or suggestion is found in the
content of this manual, contact your nearest our sales agent.
(5) Keep this manual, available easily anytime.
１
.Outline
The Model AS-203A digital scaling meter is an extremely small 3
1/2
digit display scaling meter with the scaling function which enables
input signal to be displayed as its corresponding process variable.
This meter is designed to be highly reliable using custom LSI. AS
its power supply, an isolated voltage of 5V DC or 24V DC is
available.
As its instrumentation input signals, both 1 to 5V DC and 4 to 20mA
DC are available which, can be internally selected. In addition
to the avobe input signals, other input signals are also available.
2.Specifications
Prior to factory shipment, the meter is adjusted so that it
displayes about 1000 for the fullscale input.
●
DC voltage measurement
Model No.
Range Code
Measuring
range
Display
Input
impedance
Max.
allowable
input voltage
AS-203A-1V
1 to 5V
Offset
±
1000
Fullscale
100 to 1999
Approx
1M
Ω
±
250V
Accuracy:
±
(0.1% of rdg +2digit)(23
℃±
5
℃
35 to 85% RH)
●
DC current measurement
Model No.
Range Code
Measuring
range
Display
Input
resistance
Max.
allowable
input current
AS-203A-2A
4 to 20mA
Offset
±
1000
Fullscale
100 to 1999
51
Ω
±
70mA
Accuracy:
±
(0.1% of rdg +2digit)(23
℃±
5
℃
35 to 85% RH)
●
DC voltage measurement
Model No.
Range code
Measuring
range
Display
Input
impedance
Max.
allowable
input
voltage
AS-203A-11
±
199.9mV
Offset
±
1000
Fullscale
100 to 1999
100M
Ω
±
100V
AS-203A-12
±
1.999V
100M
Ω
±
250V
AS-203A-13
±
19.99V
10M
Ω
±
250V
AS-203A-14
±
199.9V
10M
Ω
±
500V
Accuracy:
±
(0.1% of rdg +2digit)(23
℃±
5
℃
35 to 85% RH)
●
DC current measurement
Model No.
Range code
Measuring
range
Display
Input
resistance
Max.
allowable
current
AS-203A-21
±
199.9
μ
A
Offset
±
1000
Fullscale
100 to 1999
1k
Ω
±
10mA
AS-203A-22
±
1.999mA
100
Ω
±
50mA
AS-203A-23
±
19.99mA
10
Ω
±
150mA
AS-203A-24
±
199.9mA
1
Ω
±
500mA
AS-203A-25
±
1.999A
※
0.1
Ω
±
3A
Accuracy:
±
(0.2% of rdg +2digit)(23
℃±
5
℃
35 to 85% RH)
However,
±
(0.3% of rdg +1digit)only for AS-203A-25
The internal resistor marked with
※
is externally mounted.
●
Model No. Configuration EX: AS-203A-2A-4
３
.Common Specifications
Measuring function
：
Specify one Model from among Models for
DC voltage and current measurements.
Operation method
：
Double integral
Input circuit
：
Single-ended type
Floating input(isolated power supply)
Input bias current
：
2.0nA(Typical)
Sampling speed
：
2.5 times
／
sec.
Noise rejection ratio
：
NMR 40 dB (TYP.),50/60Hz
Temperature
characteristic
：
Offset displayed-value;
(TYP.)
±
0.1-digit/
℃
(MAX.)
±
0.3-digit/
℃
Fullscale displayed-value;
(TYP.)
±
0.1-digit/
℃
(MAX.)
±
0.3-digit/
℃
Overrange warning
：”
1999
”
flashes for input signal
exceeding the maximum display.
Fullscale variable range
：
100 to 1999
Offset variable range
：±
1000
Span
：
2000 counts
Display
：
LED(Light emitting diode)numeric
element Character height-8mm,Red
Polarity display
：”－”
is automatically displayed When
the measurement result is negative.
External control
：・
Scaling function:
Adjusted by the fine adjuster at the
front.
・
External hold:
Signal is HOLD by connecting the HOLD
terminal with the COM terminal.
・
Blanking:
Signal is HOLD by connecting the
BLANK terminal with the COM
terminal.
Decimal point
：
Can be set to any position.
(By front stud pin selection)
Operating temperature/
humidity range
：
0 to 50
℃
,35 to 85%RH
(No dew-condensing)
Power supply
：
5V DC
±
5%,120mA max.
24V DC
±
20%,30mA max.
Power consumption
：
For 5V DC; Approx. 0.45W
For 24V DC; Approx. 0.48W
Dimensions
：
48(W)
×
24(H)
×
73(D)mm
Weight
：
Approx. 46g(mainframe only)
Dielectric strength
：
Between power terminal(0V) and input
terminal(LO);For 1 min. at 500V DC
Between input terminal(LO) and
mounting panel;For 1 min. at 1500V AC
Insulation resistance
：
Between each terminal described above;
More than 100M
Ω
at 500V DC
Accessories
：
Connector 1Pc.
Instruction manual 1 copy
Standards
：
IEC1010-1, EN50082-2, EN50081-2
EN IEC 63000
Setup enviroment
：
Installation category
Ⅱ
,
pollution degree2(IEC1010-1)
Altitude
：
2000m max.
DIGITAL SCALING METER
INSTRUCTION MANUAL
MODEL AS-203A Series
Caution
(3/4)
WATANABE ELECTRIC INDUSTRY CO., LTD.
Incorrect handling may cause
death or injury.
Warning
Do not disassemble or touch the interior while the
power is ON.
This may cause an electric shock.
Attention
The mark on the label indicates the measuring range
in the specification of item 2.
On the AS-203A,connect the control inputs (HPLD, Decimalpoint)
to base-isolated devies when the input signal is 70V DC or more.
