Instruction Manual MODEL AM-756
16/20
Measurement
value
Comparative
set value
HH or HI
Comparative
set value
LO or LL
ON
ON
Comparative
output
HH or HI
Comparative
output
LO or LL
Hysteresis
Hysteresis
Time
Comparative Output
Output OFF
→
ON Conditions
HH
Measurement value < (
－
)
HI
Measurement value < (
－
)
GO
One of HH, HI, LO, LL is ON (No Hysteresis)
LO
Measurement value > (
+
)
LL
Measurement value > (
+
)
7-4-3 Comparative Output Deactivation Delay Function
When the comparison results function is deactivated, this function will switch
the comparative output deactivation delay ON for the set time duration only,
then switch OFF.
Parameter Used:
Delay Time (msec): RLD set value × 20msec
7-4-4 Comparative Output Latch Function
When comparative output reads any judgment other than GO, this status will
be saved (latched).
Parameter Used:
To deactivate the latch function, please follow the following steps.
(1)
Go to parameter setting mode.
(2)
Turn the relay reset control terminal ON.
7-4-5 Comparative Output Reset Function
This function can be used to turn all comparative output results OFF using the
relay reset control terminal.
7-5 External Control Terminal Function
7-5-1 External Control Terminal Specifications
ON voltage: 0 to 0.8V
OFF voltage: 4.5 to 5V
Input current:
Max. -3mA
･
Please ensure that the supplied control terminal input is no-voltage contact
input.
･
When inputting with a transistor or similar device, please connect the device
using open-collector output.
･
As the contact current is low, please ensure a terminal for minute electric
currents is used for contact input.
7-5-2 Peak Hold Function
(1)
Peak Hold
This function can hold the maximum value (PH), minimum value (VH) or the
difference between the maximum and minimum values (PVH) during
measurement. Peak hold can be controlled with the external control terminal.
Parameter Used:
(2)
Operation Type
There are two peak hold types; Type A (real display) and Type B (result
display).
Parameter Used:
･
Type A: This operation type commences peak hold measurement when peak
hold terminal is activated, and updates the peak hold value at each
sampling rate. When peak hold terminal is deactivated, peak hold
measurement ends and the device returns to routine measurement.
･
Type B: This operation type updates peak hold values stored while peak hold
terminal is OFF when peak hold terminal is activated, and saves the
peak hold values until the next update.
7-5-3 Start/Hold Function
(1)
Start/Hold
This function enables control over the commencement and ending of
measurement using the external control terminal.
(2)
Operation Type
There are two Start/Hold operation types; Type A (free run) and Type B (one
shot).
Parameter Used:
･
Type A: This operation type enters hold status when Start/Hold is ON, halting
measurement. The comparative, analog and BCD outputs save the
values recorded before HOLD was activated.
･
Type B: This operation type executes one measurement only when Start/Hold
switches from OFF to ON, updating the comparative, analog and
BCD outputs. A HOLD status is maintained for everything else.
Measurement values are only updated once, even if Start/Hold is
switched on more than once during the sampling time.
(3)
Start/Hold Response Time
Max. ( (20msec × AVG set value))
(4)
Start Delay
When the Start/Hold function is being used, it is possible to delay the
commencement of measurement for a set period of time.
Parameter Used:
Start Delay Time (msec) = S/H.D set value × 20msec × AVG set value
7-5-4 Pattern Select
The external control terminal or front panel keys can be used to switch
between the 8 comparative setting value patterns, hysteresis and scaling
setting values.
(1)
Pattern Select Method
Pattern select may be executed using the external control terminal, the front
panel keys or through parameter settings.
Parameter Used:
(2)
Pattern Select: Using Front Panel Keys
3 sec
Pattern 1
Measurement mode
Pattern 2
Pattern 3
Pattern 8
3 sec
3 sec
3 sec
3 sec
N.B.1) Even if pattern numbers are changed using the front panel keys, they
will not be saved to the E
2
PROM.
N.B.2) The front panel keys may not be used for the pattern select function
method during setting mode or maximum minimum value mode.
(3)
Pattern Select: Using Parameter Change
When the pattern selection method is set to “INT,” the set values can be
changed using the parameter pattern numbers. When the set values are
changed, the pattern number is saved to the E
2
PROM and the set pattern is
activated at the next start-up.
Parameter Used:
(4)
Parameter Select: Using Control Terminal
When the control terminal is used for pattern select, the patterns used can be
switched by turning the pattern select control terminals ON and OFF.
Selected Pattern No. PSEL0 Terminal PSEL1 Terminal PSEL2 Terminal
1
OFF
OFF
OFF
2
ON
OFF
OFF
3
OFF
ON
OFF
4
ON
ON
OFF
5
OFF
OFF
ON
6
ON
OFF
ON
7
OFF
ON
ON
8
ON
ON
ON
7-6 Display
7-6-1 Main Display Update Cycle
The main display update cycle can be changed. The display update cycle and
sampling rate are not related.
Parameter Used:
7-6-2 Display Blank
This function changes the display brightness and extinguishes the main
display.
When the main display is extinguished, the comparative output display and
function display will illuminate.
Parameter Used:
+5V
Control
section
AM-756
Control
terminal
COM
Input Current
