RPPD
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-1693 Rev.11 P. 6 / 7
■
SENSITIVITY ADJUSTMENT
You can change the detection level with the sensitivity adj.
located behind the front cover. The V
H
determines the pulse
rise and the V
L
determines the pulse fall. With SW1/2-7 set
to ON, the input signal is scaled down by 1/2 (1/3 for the
model number suffix code A). Be sure that the sensitivity
levels are also scaled down by 1/2 (1/3 for the model number
suffix code A). See the Ordering Information Sheet included
in the package for the factory settings.
For the RS-422 line driver pulse input, there is no need of
adjustment because a line receiver conforming with the RS-
422 standard is incorporated.
• 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
(6) of base socket. See the figure to the right.
2) If you need a noise filter, turn on the SW1/2-5 or SW1/2-6.
3) Connect the positive probe to the test hole No. 2 and turn
the V
H
potentiometer until the meter shows desired val-
ue.*
1
4) Connect the positive probe to the test hole No. 3 and turn
the V
L
potentiometer until the meter shows desired val-
ue.*
1
5) Apply input signal and check that input monitor LED
(PL1 or PL2) blinks according to the input signal.*
2
*1. For the V
H
(V
L
) sensitivity level less than 5 V, turn off the
SW2-3 (SW1-3). For less than 10 V, 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
H
and V
L
in order to prevent noise interference.
*2. 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.
1
2 +
3 +
V
H
V
L
–
Connect to
Terminal 4 (6)
of the base
socket.
Voltmeter
Test Holes
Input Monitor LED (PL1)
Sensitivity Adj. (V
H
)
Sensitivity Adj. (V
L
)
Input Monitor LED (PL2)
(front cover open)
Amplitude
Vinp-p
t
Volts
Sensitivity Level
Input Monitor LED
V
H
V
L
VOLTAGE PULSE (example)
Amplitude
Vinp-p
t
Volts
The voltage which remains across
the terminals with contact ON
V
H
Exc.
V
L
0V
OFF
ON
0V
DRY CONTACT (example)
