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Instruction Manual for MODEL A9□11-0□,A9□12-0□
5.3 Tracking Zero
The tracking zero is a function for automatically digitally correcting the
movement of the zero point inside. This function starts to work at the
instant the digital zero function is enabled. Correction is made according
to the values set for the tracking zero time setting and tracking zero
width setting in the condition data.
Example of setting: Tracking zero time setting 5 (Correction made every 5 averaging (sampling))
Tracking zero width setting 3(correction width of 3digit)
Digital zero ON
Displayed
value
3
2
1
（Display）
0
-1
-2
-3
5 samplings
Tracking
zero
(Tracking
starts
zero time)
(1)
(2)
(1) Digital zero function is enabled. Displayed value becomes 0.
(2)(3) At 5th sampling time, because displayed value is under 3 digit,
correction is performed and displayed value become "0".
(4) Because displayed value is over 3 digit, correction is not
performed.
(5) Because displayed value is under 3 digit, correction is performed
and displayed value become "0".
6. External Control Function
For those equipped with BCD outputs, there are the hold, digital zero
and peak hold functions that can be external controlled.
The external control terminals are DC isolated from the power and input
terminals.
6.1 Hold Function
The hold function is a function for stopping refreshing indication at an
arbitrary timing. It is activated by shorting the HOLD terminal to the COM
terminal or bringing its potential to the "0" level.
6.2 Digital Zero Function
The digital zero function is a function for resetting indication to zero at
an arbitrary timing and then displaying a range of variations from that
point onward. ON/OFF of the digital zero function can be controlled
either by the terminal control or by using keys on the front panel.
For terminal control, this function is activated by shorting the DZ terminal
to the COM terminal or bringing its potential to the "0" level.
For control using front-panel keys, it can be activated by pressing the
Increment key with the Mode key held down. Taking the same step again
causes this function to be deactivated.
* For operation using the control terminals or the front panel keys,
terminal control has precedence over front-panel key operation.
6.3 Peak Hold Function
The peak hold function is a function for holding the maximum value
(Peak Hold), the minimum value (Valley Hold), and the difference
between them (Peak Valley Hold). Switching between these holding
functions is achieved using condition data. The peak hold function is
activated by shorting the P/H terminal to the COM terminal or bringing its
potential to the "0" level.
6.4 Pattern Select Function
Pattern select function is a function selects one scaling data pattern from
pattern 1to 4.
A pattern is selected by the conditions of P.SEL0 and P.SEL1 terminals
as shown below:
Selected Pattern
Ｐ.ＳＥＬ１
Pattern No.1
Open / "1" level
Pattern No.2
Open / "1" level
Pattern No.3
Short with COM / "0" level
Pattern No.4
Short with COM / "0" level
* Only one pattern is required, leave P.SEL0 and P.SEL1 open and use pattern No.1.
6.5 Control Terminal Signal Level
Signal levels of all control terminals are as shown below :
"０" level ： 0-1.5Ｖ
"1" level ：3.5-5Ｖ
（Input current: -0.5ｍＡ）
* Control terminals are isolated from the power input and signal inputs .
Tracking zero
width
(3)
(4)
(5)
Ｐ.ＳＥＬ０
Open / "1" level
Short with COM / "0" level
Open / "1" level
Short with COM / "0" level
7. Specifications
■Input Specifications
●DC voltage measurements
Range Measurement
Display
range
11
±199.99mV Offset
12
±1.9999V
±19999
Full scale
13
±19.999V
±19999
14
±199.99V
●DC current measurements
Range Measurement
Display
range
22
±1.9999mA Offset
±19999
23
±19.999mA
Full scale
24
±199.99mA
±19999
25
±1999.9mA
■Common specifications
A/D conversion
: ⊿Σ conversion method
Input circuit
: Single-ended
Setting sampling rate
: 25times/sec（max）
Overrange warning
: For an input signal exceeding the display range, displays
O.L.or –O.L..
Main display
: 7-segment LED （color: red, character height：14.2mm）
Display range
: -19999 ～ 19999
Zero indication
: Leading zero suppression
Inner EEPROM
: 1,000,000 cycles
endurance
Operating
: 0 to 50℃, 35 to 85 %RH (no condensation)
temperature and
humidity ranges
Storage temperature
: -10 to 70℃, 60%RH or less
and humidity ranges
External dimensions
: 96mm(W) × 48mm(H) × 75mm(D)
Weight
: 160g (TYP) (AC power) / 150g (TYP) （DC power）
Dielectric strength
: AC1500V for 1minute between the power terminals and each
of the input, BCD outputs and the external control (AC
power).
DC500V for 1minute between the power terminals and each
of the input, BCD outputs and the external control (DC
power).
DC500V for 1minute between the input and each of BCD
outputs and the external control.
AC1500V for 1minute between the casing and each terminal..
Insulation resistance
: 100MΩ or more at 500VDC between the above-noted
terminals,
(*1)A writing to the internal EEPROM is performed, when the parameter setting is done and
when the DZ(digital zero)input turns from OFF to ON if the digital zero backup is enabled.
Please note that the number of the writing exceeds the endurance.
■Power specifications
●AC power （A9111-0□, A9112-0□）
Voltage range
： AC100 to 240V ±10%
Power consumption
： 4.5VA (MAX)
●DC power （A9311-0□, A9312-0□）
Voltage range
： DC5V -5% to 12V +10%
Power consumption
： 1.5W (MAX)
●DC power （A9411-0□, A9412-0□）
Voltage range
： DC12 to 24V ±10%
Power consumption
： 1.7W (MAX)
■
External control
Hold
： Activated by shorting the HOLD terminal to the COM
terminal or bringing the potential of the HOLD terminal to "0"
level.
Digital Zero
： Activated by shorting the DZ terminal to the COM terminal
or bringing the potential of the DZ terminal to "0" level.
Peak hold
： Activated by shorting the PH terminal to the COM terminal
or bringing the potential of the PH terminal to "0" level.
Pattern select
： One of scaling data patterns is selected by a combination
of shorting or opening P.SEL0and P.SEL1terminals to the
COM terminal
* "0" level : 0 to 1.5V with respect to COM terminal. "1" level :3.5 to 5V with respect
to COM terminal.
■Option Specifications
●BCD Outputs
◎TTL output（A9□11-02, A9□12-02）
Measured data
: Tri-state parallel BCD
Polarity signal
: 1 level for negative indication
Overrange signal
: 1 level for overrange indication
Printout
command
: Positive pulse output after the completion of measurement
signal
Output logic
: Switchable (PC logic not switchable)
Output signal
: TTL level fan-out = 2, CMOS compatible
◎Open collector output (NPN type) （A9□11-03, A9□12-03）
Measured data
: Negative logic. （Transistor ON when is logic 1）
Polarity signal
: Transistor ON for negative indication
Overrange signal
: Transistor ON for overrange indication
Printout
command
: Transistor ON after the completion of measurement
signal
Output logic
: Switchable (PC logic not switchable)
Transistor
output
: Voltage
capacity
saturation voltage 1.2 V or less at 10 mA
●Enable
function
： By connecting the ENABLE terminal to COM terminal or
bringing the potential of the ENABLE terminal to"0" level,
BCD outputs become High impedance (TTL output) /
transistors turn off (Open collector output)
* "0" level : 0 to 1.5V with respect to COM terminal，"1" level : 3.5 to 5V with
respect to COM terminal
23℃±5℃,35 to 85%
Input
Accuracy
Maximum
impedance
Permissible Input
100MΩ
±50V
±(0.1% of rdg + 2digit)
1MΩ
±250V
23℃±5℃,35 to 85%
Input
Accuracy
Maximum
impedance
Permissible Input
10Ω
±50mA
±(0.2% of rdg + 3digit)
0.1Ω
*1
30 V DC max., Current
10 mA max.
6/8
±3A
Output
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