Input Filter; Sensitivity Adjustment - M-system JPSM Instruction Manual

INPUT FILTER

The tables below show the maximum frequency which can
pass through the filter when the sensitivity level is set to 2V.
The frequency may change according to the sensitivity level.
After turning the filter ON, check that the PL1 blinks
according to the input signal 1 and the PL2 according to the
input signal 2. If it does not, readjust the sensitivity accord-
ing to the instructions in the following section.
•Noise Filter Type 1 (SW1–5, 2–5 = ON)
DC Coupling
(SW1–8, 2–8 = ON)
V p-p (V) MAX. FREQ. (Hz)
5 69
12 35
24 89
•Noise Filter Type 2 (SW1–6, 2–6 = ON)
DC Coupling
(SW1–8, 2–8 = ON)
V p-p (V) MAX. FREQ. (Hz)
5 1220
12 329
24 851

SENSITIVITY ADJUSTMENT

You can change the detection level with the sensitivity adj.
located behind the front cover. The V
rise and the V determines the pulse fall. See the Ordering
L
Information Sheet included in the package for the factory
settings.
•How to Change the Sensitivity
A voltmeter of class 0.5 or better accuracy with pointed
probes is required.
1) Connect the negative probe of voltmeter to the terminal 4
of base socket. See the figure to the right.
2) If you need a noise filter, turn on the SW1–5, 2–5 or SW1–
6, 2–6.
3) Connect the positive probe to the test hole No. 2 and turn
the V potentiometer until the meter shows desired
H
value.***
4) Connect the positive probe to the test hole No. 3 and turn
the V potentiometer until the meter shows desired
L
value.***
5) Apply input signal (Input 1 & 2) and check that input
monitor LED (PL1 & 2) blinks respectively according to
the input signal.****
***For the V (V ) sensitivity level less than 5V, turn off the
H L
SW2–3 (SW1-–3). For less than 10V, turn on the SW2–3
(SW1–3).
The voltage values approx. half the amplitude are recom-
mended for normal use.
You had better have a reasonable span between V
order to prevent noise interference.
****If the LED does not blink correctly, the sensitivity level
may be out of the pulse amplitude. Check the offset, ampli-
tude, etc. and go through the adjustment procedure again.
AC Coupling
(SW1–8, 2–8 = OFF)
V p-p (V) MAX. FREQ. (Hz)
5 22
12 65
24 112
AC Coupling
(SW1–8, 2–8 = OFF)
V p-p (V) MAX. FREQ. (Hz)
5 256
12 664
24 1090
determines the pulse
H
and V
H
Volts
V
H
V
L
0V
VOLTAGE PULSE (example)
ON
OFF
Volts
V
H
V
L
0V
DRY CONTACT (example)
in
L
Sensitivity Adj. (V )
L
Sensitivity Adj. (V
H
Test Holes
1
2 +
3 +
Input Monitor LED (PL1)
Input Monitor LED (PL2)
(front cover open)
Sensitivity Level
Input Monitor LED
The voltage which remains across
the terminals with contact ON
P. 5 / 8
JPSM
)
V
H
V
L
Voltmeter
–
Connect to
Terminal 4 (6)
of the base
socket.
Amplitude
Vinp-p
t
Amplitude
Vinp-p
t
EM-1689 Rev.5