Instruction Manual for MODEL A9
□
11-0
□,
A9
□
12-0
□
6/8
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.
(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 val
ue 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
Ｐ.ＳＥＬ０
Pattern No.1
Open / “1” level
Open / “1” level
Pattern No.2
Open / “1” level
Short with COM / “0” level
Pattern No.3
Short with COM / “0” level
Open / “1” level
Pattern No.4
Short with COM / “0” level
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
：
0-1.5
Ｖ
”1” level
：
3.5-5
Ｖ
（
Input current: -0.5
ｍＡ）
* Control terminals are isolated from the power input and signal inputs .
7. Specifications
■Input Specifications
●DC voltage measurements 23℃±5℃,35 to 85%
Range Measurement
range
Display
Accuracy
Input
impedance
Maximum
Permissible Input
11
±199.99mV Offset
±19999
Full scale
±19999
±(0.1% of rdg + 2digit)
100MΩ
±50V
12
±1.9999V
13
±19.999V
1MΩ
±250V
14
±199.99V
●DC current measurements 23℃±5℃,35 to 85%
Range Measurement
range
Display
Accuracy
Input
impedance
Maximum
Permissible Input
22
±1.9999mA Offset
±19999
Full scale
±19999
±(0.2% of rdg + 3digit)
10Ω
±50mA
23
±19.999mA
24
±199.99mA
0.1Ω
±3A
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
endurance
: 1,000,000 cycles *1
Operating
temperature and
humidity ranges
: 0 to 50℃, 35 to 85 %RH (no condensation)
Storage temperature
and humidity ranges
: -10 to 70℃, 60%RH or less
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
signal
: Positive pulse output after the completion of measurement
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
signal
: Transistor ON after the completion of measurement
Output logic
: Switchable (PC logic not switchable)
Transistor
output
capacity
: Voltage 30 V DC max., Current 10 mA max. Output
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
Tracking
zero
starts
5 samplings
(Tracking
zero time)
Digital zero ON
Displayed
value
(1)
(2)
(3)
(4)
(5)
0
-1
-2
-3
1
2
3
（Display）
Example of setting: Tracking zero time setting 5 (Correction made every 5 averaging (sampling))
Tracking zero width setting 3(correction width of 3digit)
Tracking zero
width
