WATANABE ELECTRIC INDUSTRY CO., LTD AP-244A-11 series, AP-244A-12 series, AP-244A-13 series, AP-244A-14 series Instruction 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)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.

1.Before operation
1-1 Checking Model No.

Each of AP-244A Model Nos. is configured as shown in the following,

check that the Model No. ordered matches that delivered.

1.2 Checking accessories
The following accessories will come with the AP-244A.
Lower 10-pin connector・・・・・1 pc.
Instruction manual・・・・・・・1 copy
Upper 26-pin connector・・・・・1 pc.
(Only with BCD output)
If you have any query, please contact our sales agent or Watanabe

directly.

1.3 Mounting

1.3.1 Panel cutout dimensions
Make the panel cutout for mounting the AP-244A according to the
following Fig.

1.3.2 Mounting the AP-244A
When mounting the AP-244A in the panel, push the meter in the panel

from the panel front while pressing down the snaps located at the
sides of the case.

1.4 Terminal connection diagram

*Do not gradually apply the power supply voltage to the meter but
from 0V quickly to the rated voltage. (If the voltage is gradually
increased, the meter may not start.)

2. Various functions

2.1 Setting the position of decimal point

The position of the decimal point of this meter can be externally
controlled from the lower connector terminals. Short the terminal
corresponding to the digit to be lit with the COM terminal.

2.2 Start/hold function

The start/hold function is used to control display hold

(measurement stop) and start (measurement start) from the external
control terminals.

Measurement is held with the START/HOLD terminal shorted with the

COM terminal (or level 0) or started with the START/HOLD terminal
opened from the COM terminal (or level 1).

In addition, a positive pulse within one-sampling time exceeding

1 ms enables one-shot measurement.

The function of the START/HOLD terminal wired on the upper side

when the BCD output is optionally provided is the same as that
described above.

However in this case, the control line is isolated from the input

signal line.

2.3 BCD output

This meter can provide the parallel BCD output as option. In
addition, for the BCD output of this meter, the input circuit is
isolated from the power circuit.

2.3.1 Terminal connection diagram

2.3.2 Output status[( );For TTL]

Measured data;
Negative logic (Positive logic)
Polarity signal;
Transistor turned on at plus (Logic 1)
OVER signal;
Transistor turned on at OVER (Logic 1)
Printing command output (PC);
Transistor turned on (Logic 1) for about 10 ms every time

measurement is complete.
Output capacity;
Max. voltage 30V
Max. current 15 mA (Fanout 2)

INSTRUCTION MANUAL

DIGITAL PANEL METER

MODEL AP-244A SERIES

Caution

WATANABE ELECTRIC INDUSTRY CO., LTD.

2.3.3 ENABLE

All of the transistors are turned off for the open -collector output

or they are set to the high impendance state for the TTL output
with the ENABLE terminal shorted with the D.COM terminal or set
to level 0.

2.4 Selecting sampling speed
Select a sampling speed of 12.5 times/sec (50Hz) or 15 times/sec

(60Hz) depending on the commercial power frequency used. (If the
incorrect frequency is selected, the meter operates as usual but
its display may widely fluctuate.)

3. Calibration

In order to calibrate this meter, a standard voltage generator with

an accuracy of ±0.01% or higher is required. In addition, for
calibration, see the following Fig.

4.Specifications

Model No./

range codes

Measurem­ent range

Max.

resolution

Input

impedance

Max.allowable
Input Voltage

AP-244A-11-

XX-X

±

199.99mV

10μV

100MΩ

±100V

AP-244A-12-

XX-X

±

1.9999V

100μV

100MΩ

±100V

AP-242A-13-

XX-X

±

19.999V

1mV

1MΩ

±250V

AP-242A-14-

XX-X

±

199.99V

10mV

1MΩ

±250V

Accuracy: ±(0.03% of rdg. +1 digit) at 23℃±5℃

■General specifications

Measurement

function

：DC voltage measurement

Operation method

：Double integral

Input circuit

：Single-ended type

Max. display

: 19999

Sampling speed

：2.5 times/sec.

12.5 times/sec(50Hz) or
15 times/sec(60Hz)

Noise rejection
ratio

：NMR, More than 50dB(50/60Hz)

Overrange warning

：”0000” or “-0000”flashes for an

input signal of more than 19999.

Display

：7-segment LED

(Red light emitting diode numeric

element) character height, 8mm

Polarity display

：”-“is automatically displayed when

the computation result is minus.

External control

：HOLD・・・
Shorting START/HOLD terminal with

COM terminal(or level 0)

START・・・

Opening START/HOLD terminal from COM
terminal (or level 1)

Operating temp/
humidity range

: 0 to 50℃/

35 to 85%RH

Power supply

: 5 to 12V DC ±5%

12 to 24V DC ±10%

Consuming current

：At 5V DC・・・

Approx.100mA(BCD not provided)
Approx. 220mA(BCD provided)
At 12V DC・・・
Approx.50mA(BCD not provided)
Approx. 100mA(BCD provided)
At 24V DC・・・
Approx.30mA(BCD not provided)
Approx. 60mA(BCD provided)

Dielectric
strength

：Between LO input and 0V power

terminals・・・
For 1 min. at 500V DC

Between LO input and D.COM output

terminals・・・
For 1 min. at 500V DC

Between 0V power and D.COM output
terminals・・・

For 1 min. at 500V DC

Between LO input terminal and
case・・・

For 1 min. at 1500V AC

Insulation
resistance

：Between each terminal described

above・・・

More than 100 MΩ at 500V DC

Dimensions

：48(W)×24(H)×87(D)mm

Weight

：Approx. 50g

Accessories

: Lower 10-pin connector・・・1pc.

Instruction manual・・・・・ 1 copy
Upper 26-pin connector・・・1pc.
(Only for BCD output)

5. Dimensions

6. Timing chart

7. Warranty and after-sale service

1) Warranty
This meter is warranted for a period of one year form date of
delivery. Any defect which occurs in this period and is
undoubtedly caused by Watanabe's faults will be remedied free of
charge. This warranty does not apply to the meter showing abuse
or damage which has been altered or repaired by others except as
authorized by Watanabe Co.,Ltd.

2) 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 sales agent or Watanabe
directly giving as much information on problem as possibl e.

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.

MODEL AP-244A Series ED-50092c (2/2)