WATANABE ELECTRIC INDUSTRY AP-301 Series User manual

(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)The 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) After read this manual, please keep it as anytime can see.
１.OUTLINE
The AP-301 Series digital panel meter is thin and light meter uses
only 3-1/2 digits. The meter uses a 5V power supply driving and
has large LED(Light Emitting Diode)numeric display elements
(Heght:14.2mm)which are easy to see in spite of the small case.
The display has holding and blanking functions and can show a
maximum value of 1999. The circuit largely consists of an
independently developed LSI, which is more reliable than hybrid
integrated circuit.
1 to 5V input, boards for external set screws, a terminal for a
mother board fixture, a power source isolation board and other
options can be provided as required by the customer.
２.SPECIFICATIONS
●DC Voltage Measurement
Model and
Range Codes
Measuring
Range
Max.
Resolution
Input
Impendance
Max.allowable
Input Voltage
AP-301-11
±199.9mV
100μV
100MΩ
±100V
AP-301-12
±1.999V
1mV
100MΩ
±100V
AP-301-13
±19.99V
10mV
10MΩ
±250V
AP-301-14
±199.9V
100mV
10MΩ
±500V
Accuracy:±(0.1% of rdg +1digit)(23℃±5℃, 35 to 85% RH)
●Specification: DC Voltage Measurement
Model and
Range Codes
Measuring
Range
Display
Input
Impendance
Max.allowable
Input Current
AP-301-1V
1 to 5V
0 to 1999
Approx 1MΩ
±100V
Accuracy:±(0.1% of rdg +1digit)(23℃±5℃, 35 to 85% RH)
●Model Configuration
３.COMMON SPECIFICATIONS
Measurement Function
：DC Voltage measurement
Operation Method
：Dual slope integuration
Input Circuit
：Single-ended type
Input Bias Current
：50pA(Typical)
Sampling speed
：Approx. 2.5 times／sec.
Normal Mode Noise
Rejection Ratio
：40dB(NMR)(Typical)(50Hz/60Hz)
Max. Number of Display
Digit
：1999
Overange Alarm
：For input signal exceeding maximum
display; 1999 flashes for each digit.
Display
：LED (Light emitting diode),Numeric
elements, Height 14.2mm
Polarity
：Automatic polarity selection.
Polarity Display
：When input signal is negative,
“-“sigh is displayed
External Control
：・ Hold:Short-circuit HOLD(terminal 4)
and 0V(terminal 8).
・Blanking:Short-circuit
BL(terminal 3) and 0V(terminal 8)
・Decimal point setting:
Short-circuit the decimal point
terminals 101(terminal 7),
102(terminal 6), 103(terminal 5) to
0V(terminal 8)
Operating tenparature/
humidity
: 0 to 50℃
35 to 85%RH(Nodew-Condense)
Power supply
: DC; 5V ±5%
Power Consumption
：400mW
Dimensions
：72mm(W)×36mm(H)×29mm(D)DIN size
Weight
：Approx. 35g
Dielectric strength
：Input terminal(LO)/common for AC1500V
1 minute
Insulation resistance
：DC 500V more than 100MΩat above
terminals
Accessories
: Instruction manual, Connector
４.HANDLING
4-1 Mounting
1)Panel mounting
Make a rectangular cutout as shown in Fig.1, insert the
instrument from the front into the mainframe panel as shown in
Fig.2.(Specify the panel thickness 1.0 to 4.0mm)
2)Removing from the panel
Push the instrument to the panel, holding the hook(Fig.2) with
the thumb and middle finger.
4-2 Connector Connection
Insert the provided connector into the rear of the panel meter.
・Operates when LO(terminal 2)
and 0V(terminal 8) are
Connected.
DIGITAL PANEL METER
INSTRUCTION MANUAL
MODEL AP-301 Series
Caution
(3/4)
WATANABE ELECTRIC INDUSTRY CO., LTD.
BL(Blanking)
HOLD

1)Power Connection
Connect the power to 0V(terminals 8) and +5V(terminal 9).
Use 5V±5% DC power. (Since the meter is not provided with a
power switch it is ready to start as soon as power is connected.)
There is not a fuse inside the mainframe, so if one is necessary
for safety, use a 0.2A fuse externally.
2)Decimal Point setting
Since the decimal point is not connected prior to shipment,
any decimal-point can be set on site by the customer by
connecting the connector terminals below.
3)Input connection
Connect an input signal(DC voltage)between HI(terminal 1) and
LO(terminal 2).
The circuit is on line whenever LO(terminal 2)is connected with
0V (terminal 8). Ground the input signal LO(terminal 2) side
wire and the power supply 0V(terminal 8) side wire at one point.
4)Hold and external start
The displayed value can be held by shorting the HOLD(terminal
4) with the 0V(terminal 8), or by setting the HOLD (terminal
4) to level”0”. Measurement also starts by opening these
terminals or by setting the HOLD (terminal 4) to level”1”at
the necessary timing. The minimum time required to measure a
value once is about 400ms.
In addition, since the input LO(terminal 2)and power
0V(terminal 8) in this meter are not separated and insulated,
use a mechanical contact such as a relay or switch for external
control as much as possible. When controlling with a TTL or
transistor, add an external circuit as shown Fig.3.
5)Blanking
By shorting the BL(terminal 3) and 0V (terminal 8), the numeric
displays can be turned OFF, and this is recommended when power
saving is oregured. Also, when controlling with a TTL or
transistor, use a mechanical contact for external control and
add an external circuit as shown in Fig.3.
(Level”0”0 to 1.5V, Level”1”3.5 to 5V)
5.MAINTENANCE AND INSPECTION
5-1 Caution
Store the meter where ambient temperature is between -10℃and
+70℃, and humidity is less than 60%. When used in a dusty
environment pull the meter out of the mainframe, and clear it,
as an accumulation of dust may lead to a rise in temperature
and a reduction in equipment life.
Also, since the mainframe case and the bezel are mode of plastic,
do not wipe stains off with volatile liquids such as thinners.
5-2 Calibration
・In order to assure the initial accuracy over a long period
of time, it is recommended that the meter be calibrated
periodically. When doing so, use standard equipment with
an accuracy of 0.01% or better.
Proofreading is 23 ℃ ±5 ℃, please carry out by the ambient
conditions of RH 35 to 85%.
・Calibration procedures are as follows.
(1)Remove the front bezel.
(2)Connect the power to the meter for a warm up of 20 minutes
or more prior to adjustment.
(3)Zero adjustment
・11 to 14 range
Check to ensure that the display shows 000 by shorting
terminals HI(terminal 1) and LO(terminal 2).
*11 to 14 range does not have zero adjuster of zero point
adjustment VR2.
・1V range
Apply a voltage of +1V, DC to the input and then turn the
zero adjuster VR2 until the display shows 000.
(4)Span adjustment
・11 to 14 range
Apply voltage with a +polarity to the input corresponding
to the fullscale(1900), then turn the span adjuster VR until
the display shows 1900.
Next, apply voltage with a –polarity to check that the
display shows the value of 1900±0.1% of rdg +1digit.
Note: When the input is a –polarity, if the –sign is not
required, remove the front bezel and discoonect the
jumper wire(J1) on the left of the maximum
significant digit in the numeral display.
The display will then show the absolute value with
no “-“sign.
・1V range
Apply a voltage of +4.9V, DC to the input and then turn
the span adjuster VR1 until the display shows 1950.
6.Warranty
This meter is warranted for a period of one year from date of
delivery. Any defect which occurs in this period and is undoubtedly
caused by Watanabe Electric Industry faults will be remedied free
of charge.
This warranty dose not apply to the meter showing abuse or damage
which has been altered or repaired by others except as authorized
by Watanabe Electric Industry.
7.After-sale service
This meter is delivered after being manufactured, tested and
inspected under strict quality control.
However, if any problem does occur, contact your nearest Watanabe
Electric Industry sales agent or Watanabe Electric Industry
directly giving as much information on problem as possible.
MODEL AP-301 Series UU-33581j (4/4)
6-16-19, Jingumae, Shibuya-ku, Tokyo 150-0001, Japan
Phone: [phone]
Homepage http://en.watanabe-electric.co.jp/
WATANABE ELECTRIC INDUSTRY CO., LTD.
ASAHI KEIKI DIVISION
6-16-19, Jingumae, Shibuya-ku, Tokyo 150-0001, Japan
Phone: [phone]
Homepage http://www.watanabe-electric.co.jp/en/
WATANABE ELECTRIC INDUSTRY CO., LTD.
VR2 (It is not in 11 to 14 range)
VR1

(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)The 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) After read this manual, please keep it as anytime can see.
１.Outline
This is an external screw terminal mounting board used especially
for the AP-301, with this optinal board mounted on the AP-301, such
a function as meter scaling, range selection or power isolation
becomes available.
The following 4 types of option: A,B,C and D are available.
A・・・・・Scaling(4 to 20mA)
B・・・・・Scaling(0 to 1999 display)
C・・・・・Range selection
D・・・・・Power isolation
２.Operation
2-1 Mounting of optional board on AP-301
As shown in the following Fig., match the AP-301 connector with
the optional board connector, then fix the board to the AP-301
using the attached tapping screw. In addition, stick the
attached nameplate(screw terminal connection diagram) to the
top of the AP-301 case.
2-2 Hold(HOLD)/Blanking(BL)jumper setting
Select either HOLD or BL. Connect the jumper wire to either HOLD
or BL to be used.
2-3 Decimal-point setting
Prior to factory shipment, it is so set that all decimal point
in the 101,102, and 103digits are lit. Therefore, disconnect
the jumper wire corresponding to the relevant digit which is
not to be used.
３.MODEL AP-301-11-A (Scaling: 4 to 20mA)
The AP-301-11 can be used as a scaling meter with an input of
4 to 20mA with the optional board mounted on the AP-301-11.
This optional board is power-isolated. The (LO) terminal is
floated from the (0V) terminal.
(Dielectric strength: ±300V DC)
3-1 Specifications
Measuring range
：4 to 20mA
Display
：offset ±1000, Fullscale 100 to 1999
Internal resistance
：25Ω
Max. allowable input
current
：±100mA
Accuracy
：±0.2% rdg. ±2 digits(23℃±5℃)
Temperature
coefficient
：Offset displayed-value
TYP. ±0.1-digit/℃Max. ±0.5-digit/℃
Full scale displayed-value
TYP. ±0.1-digit/℃Max. ±0.5-digit/℃
Operating temperature
：0 to 50℃
Power supply
：5V DC ±5%
Power consumption
：600mW(TYP) (When connected to the
AP-301)
Weight
：Approx. 27g(Board only)
Accessories
：Instruction manual
Tapping screw 1 pc.
Nameplate
3-2 Input/output terminal connection diagram
3-3 HOLD
When the HOLD and LO terminals are shorted, the displayed value
just after their shorting is held.
The power (0V) terminal of this option board is isolated from
the input (LO) terminal and HOLD terminal.
3-4 Blanking
The numeric displayed-value can be erased by shorting the BL
terminal with the LO terminal.
The power (0V) terminal of this option board is isolated from
the input (LO) terminal and BL terminal.
3-5 Scaling setting
・Adjustment procedure
For this adjusument, asandard equipment with an accuracy of
more than 0.01% is required. Adjust the meter in the following
order.
(1) Firet, connect the power, then warm up the meter for more than
10 min.
(2) Offset adjustment
Apply a current of 4mA to the input terminals, then set the
display unit to the desired value by turning the offset
adjuster(VR3).
(3) Span adjustment
Apply a current of 20mA to the input terminals, then set the
display unit to the desired value by turning the span
adjuster(VR2).
(4) Setting width:
Offset variable width ±1000
Fullscale variable width 100 to 1999
(Offset adjustment value < Span adjusted-value)
４.MODEL AP-301-□□-B(Scaling: 0 to 1999 display)
The fullscale displayed-value can be varied from 0 to 1999 with
the optional board mounted on the AP-301-12.
Three tupes of range code: “12”,”13”and “14”are available
depending on the measured voltage. (Non-insulated type)
4-1 Specifications
Model and
Range Codes
Measuring
Range
Display
Input
Impendance
Max.allowable
Input Voltage
AP-301-12-B
±1.999V
0 to ±100
to 1999
Approx
1MΩ
±100V
AP-301-13-B
±19.99V
0 to ±100
to 1999
Approx
1MΩ
±250V
AP-301-14-B
±199.9V
0 to ±100
to 1999
Approx
1MΩ
±500V
OPTIONAL BOARDS
INSTRUCTION MANUAL
FOR MODEL AP-301 SERIES
Caution
WATANABE ELECTRIC INDUSTRY CO., LTD.
HOLD/BL

4-2 Input/output terminal connection diagram
4-3 HOLD
When the HOLD terminal is shorted with the 0V terminal. The
displayed value just after their shorting is held.
The LO and 0V terminals on the optional board are not
DC-isolated.
4-4 Blanking
The numeric displayed-value can be erased by shorting the BL
terminal with the 0V terminal.
Use this function when power saving is required.
4-5 Scaling setting
・For this adjustment, standard equipment with an accuracy of more
than 0.01% is required. Adjust the meter in the following order.
(1) Firet, connect the power, then warm up the meter for more than
10 min.
(2) Offset
Fixed to 0
(3) Span adjustment
Apply the desired voltage to the input terminals, then set the
display unit to the desired value by turning the span adjuster
(VR).
(4) Setting width:
Fullscale variable width: 100 to 1999
５.MODEL AP-301-□□-C(Range selection)
Any measuring range from range cord “12”to range cords “13”
and “14”can be easily changed with the optional board mounted
on the AP-301-12. (Non-insulated type)
5-1 Specifications
・DC voltage measurement
Model and
Range Codes
Measuring
Range
Highest
resolution
Input
Impendance
Max.allowable
Input Voltage
AP-301-12-C
±1.999V
1mV
Approx
1MΩ
±100V
AP-301-13-C
±19.99V
10mV
Approx
1MΩ
±250V
AP-301-14-C
±199.9V
100mV
Approx
1MΩ
±500V
5-2 Input/output terminal connection diagram
5-3 Range selection
Set the 2-core shorting socket as shown in the following diagram.
For range cord “12”: To No. 12
For range cord “13”: To No. 13
For range cord “14”: To No. 14
When the range is changed, calibrate the meter in accordance with
“Item 6-2”in the instruction manual for the AP-301.
5-4 HOLD
When the HOLD and 0V terminals are shorted, the displayed value
just after their shorting is held.
The LO and 0V terminals are not DC-isolated.
5-5 Blanking
The numeric displayed-value can be erased by shorting the BL and
0V terminals. Use this function when power saving is required.
６. MODEL AP-301-□□-D(Power isolation)
This optional board can be mounted on the AP-301 with any of range
cords from “11”to “14”.
This board is power-isolated.
The LO terminal is floated from the 0V terminal.
(Dielectric strength: ±300V DC)
In addition to DC +5V(4.75 to 5.25V), DC +24V(19 to 29V)is available
as the power supply.
6-1 Input/output terminal connection diagram
6-2 HOLD
When the HOLD and 0V terminals are shorted, the displayed value
just after their shorting is held.
The input (LO) terminal of this option board is isolated from
the power (0V) terminal and HOLD terminal.
(Dielectric strength: ±300V DC)
6-3 Blanking
The numeric displayed-value can be erased by shorting the BL
terminal with the 0V terminal.
The input (LO) terminal of this option board is isolated from
the power (0V) terminal and BL terminal.
(Dielectric strength: ±300V DC)
7.Warranty
This board is warranted for a period of one year from date of
delivery. Any defect which occurs in this period and is undoubtedly
caused by Watanabe Electric Industry faults will be remedied free
of charge.
This warranty does not apply to the board showing abuse or damage
which has been altered or repaired by others except as authorized
by Watanabe Electric Industry.
8.After-sale service
This board is delivered after being manufactured, tested and
inspected under strict quality control.
However, if any problem does occur, contact your nearest Watanabe
Electric Industry sales agent giving as much information on problem
as possible.
MODEL AP-301 Series OPTIONAL Boards UU-33582j
WATANABE ELECTRIC INDUSTRY CO., LTD.
6-16-19, Jingumae, Shibuya-ku, Tokyo 150-0001, Japan
Phone: [phone]
Homepage http://en.watanabe-electric.co.jp/
ASAHI KEIKI DIVISION
WATANABE ELECTRIC INDUSTRY CO., LTD.
6-16-19, Jingumae, Shibuya-ku, Tokyo 150-0001, Japan
Phone: [phone]
Homepage http://www.watanabe-electric.co.jp/en/
HOLD/BL