(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.
