M-system 20VS8-202N User manual

20VS8-202N
P. 1 / 4
EM-4444
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
ISOLATION AMPLIFIER
(small size, input isolation, DIP type) MODEL 20VS8-202N
INSTRUCTION MANUAL
BEFORE USE ....
Thank you for choosing M-System. Before use, check the
contents of the package you received as outlined below.
If you have any problems or questions with the product,
please contact M-System’s Sales Office or representatives.
■PACKAGE INCLUDES:
Amplifier ....................................................................... (1)
■MODEL NO.
Confirm that the model number described on the product is
exactly what you ordered.
■INSTRUCTION MANUAL
This manual describes necessary points of caution when
you use this product, including installation, connection and
basic maintenance procedures.
POINTS OF CAUTION
■POWER INPUT RATING
•Operationalvoltagerange&powerconsumption
15V DC rating: Rating ±5%, approx. 7.5mA (with no load)
■ENVIRONMENT
•Indooruse
•Donotinstalltheunitwhereitissubjectedtocontinuous
vibration. Do not apply physical impact to the unit.
•Environmentaltemperaturemustbewithin-25to+85°C
(-13to185°F)withrelativehumiditywithin30to90%RH
in order to ensure adequate life span and operation.
■WIRING
•Do not install cables (power supply, input and output)
close to noise sources (relay drive cable, high frequency
line, etc.).
•Do not bind these cables together with those in which
noises are present. Do not install them in the same duct.
■INSTALLING THE MODULE
When it is installed on the printed wiring board, land diam-
eterø1.6andthrough-holeø1.0arerecommended.
■AND ....
•Theunitisdesignedtofunctionassoonaspowerissup-
plied,however,awarmupfor10minutesisrequiredfor
satisfying complete performance described in the data
sheet.
•With voltage output, do not leave the output terminals
shortcircuited for a long time. The unit is designed to en-
dure it without breakdown, however, it may shorten ap-
propriate life duration.
CHECKING
1) Terminal wiring: Check that wiring is correctly connect-
ed according to the connection diagram.
2) Powerinputvoltage:Checkvoltageacrossthepins.
3) Input:Checkthattheinputsignaliswithin0–100%of
the full-scale.
4) Output: Check that the load resistance meets the de-
scribed specifications.
TERMINAL CONNECTIONS
■EXTERNAL DIMENSIONS mm (inch)
max. 53.3 (2.1) 17.8 (.7)
12.7 (.5)
40.6 (1.6)
2.54 (.1)
40.6 (1.6)
max. 8.9
(.35)
min. 2.5
(.1)
17.8 (.7) 12.7 (.5)
12318
22
19
38 37 36 20
0.46 (.02) dia.
20
19
18
3
2
1
Output (+)
Output COM (–)
Inverting Input
38
37
36
Feedback
Reference Voltage Source (+)
Reference Voltage Source (–)
Power Supply (–)
Input COM (–)
Non-inverting Input
22
Power Supply (+)
PIN ASSIGNMENTS

20VS8-202N
P. 2 / 4
EM-4444
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
■CONNECTION DIAGRAM
3
38
37
20
22
36
1
2
19
18
INPUT VIN
+
FEEDBACK
COM (–)
NON-INVERTING INPUT
INVERTING INPUT
REFERENCE Volt. SOURCE for INPUT –
Note. The reference voltage source for input is common to the input COM (–)
+
OUTPUTVo
+
COM (–)
–
POWER SUPPLY
APPLICATION EXAMPLES
The primary amplifier in this unit is high accurate. Installing external resistors to the inverting input (pin 3) and the feed-
back (pin 4), this unit can be used as a non-inverting or inverting amplifier.
The series resistance of the amplifier, R1+R2mustbebetween10kΩand200kΩ.
The output is proportional to the input.
The gain is 1.
E.g.0–5VDCfor0–5VDCinput.
The output is inverted from the input.
The gain is -1.
E.g.0VDCfor0VDCinputand-5V
DCfor+5VDCinput.
For a non-inverting amplication, the
output is following.
VO=(1+R1/ R2) × VIN
When R1=10kΩ,R2=10kΩ,thenthe
outputisfollowing.Thegainis2.
VO=2×VIN
38
3
■
2
1
36
37
19
18
15V DC
POWER
20
22
Non-inverting amplifier circuit: Basic example of G = 1
Non-inverting circuit G = 1
REF. Volt. SOURCE for INPUT
INPUT VIN OUTPUT Vo
+
–
+
–
+
–
+
–
+
–
38
3
OUTPUT Vo
36
37
19
18
20
22
R1R1
2
1
15V DC
■
Inverting amplifier circuit: Basic example of G = -1 (output is inverted from the input)
Inverting circuit G = -1
REF. Volt. SOURCE for INPUT
INPUT VIN
+
–
+
–
+
–
+
–POWER
+
–
–
38
3
OUTPUT Vo
–
−
36
37
18
–
20
22
R2R1
–2
1
19
15V DC
POWER
■Non-inverting amplifier circuit: Example of G = 1 + R1/ R2
INPUT VIN
REF. Volt. SOURCE for INPUT
Non-inverting amplifier circuit G = 1 + R1/ R2
+
+
+
+
+

20VS8-202N
P. 3 / 4
EM-4444
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
Foraninvertingamplication,theout-
put is following.
VO = -(R1/ R2) × VIN
When R1=20kΩ,R2=10kΩ,thenthe
outputisfollowing.Thegainis-2.
VO=-(20kΩ/10kΩ)× VIN=-2× VIN
+
–
38
3
–
+
+
–
36
37
19
18
+
–
20
22
+
R2R1
– 2
1
15V DC
POWER
■Inverting amplifier circuit: Example of G = -R1/ R2(output is inverted from the input)
Inverting amplifier circuit G = -R1/ R2
OUTPUT VO
INPUT VIN
REF. Volt. SOURCE for INPUT
Foranon-invertingamplicationwith
externaladjustments,when the com-
bined resistance of the span adjust-
ment and 9 kΩ is 10 kΩ, the gain is
(1+10kΩ/R2) × VIN. With the span
adjustment(2kΩ),theoutputiscon-
gurable.Thezeroisadjustablewith
a reference voltage source of ±16.5 V
DC  and the attenuation of 200Ω and
30kΩ.
For an inverting amplication with
externaladjustments,when the com-
bined resistance of the span adjust-
ment and 9 kΩ is 10 kΩ, the gain is
-(10kΩ/R2) ×VIN. With the span ad-
justment(2kΩ),theoutputis cong-
urable.Thezeroisadjustablewith a
reference voltage source of ±16.5 V DC
and the attenuation of 200 Ω and 30
kΩ.
9kΩ
10kΩ
50kΩ
(ZERO)
2kΩ
(SPAN)
10kΩ
30kΩ
200Ω
38
3
36
37
18
20
22
1
2
■
Non-inverting amplifier circuit with external adjustments: Example of G = 2
+
––
+
+
–
Non-inverting amplifier circuit zero/span adjustments
INPUT VIN
REF. Volt.
SOURCE
for INPUT
19
15V DC
POWER
OUTPUT Vo
+
–
+
–
9kΩ
10kΩ
100kΩ
(ZERO)
2kΩ
(SPAN)
10kΩ
30kΩ
200Ω
19
18
20
22
15V DC
POWER
38
3
36
37
2
1
■
Inverting amplifier circuit with external adjustments: Example of G = -1 (output is inverted from the input)
+
+
–
–
+
+
–
Inverting amplifier circuit zero/span adjustments
–
OUTPUT VO
INPUT VIN
REF. Volt.
SOURCE
for INPUT
+
–
38
3
36
37
2
1
19
18
20
22
15VDC
POWER
+
–
INPUT VIN
+
–
+Vos
–Vos
–
+
–
+
■Non-inverting amplifier circuit: With noise filter
REF. Volt. SOURCE
for INPUT
+
–
Circuit with low-pass filter installed
on the output.

20VS8-202N
P. 4 / 4
EM-4444
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
MAINTENANCE
Regular calibration procedure is explained below:
■CALIBRATION
Warmuptheunitforatleast10minutes.Apply0%,25%,
50%, 75% and 100% input signal.  Check that the output
signal for the respective input signal remains within accu-
racy described in the data sheet.