20VS1D
P. 2 / 2
EM-4431
APPLICATION EXAMPLE
22
21
20
19
V
REF
V
OUT
R1
R2
IC1
IC2
R3
10kΩ
R4
6.08kΩ
+
–
+
–
+
–
INPUT V
IN
To adjust zero and span, use top adjusters.
For input 1-5V DC, output is 4-20mA DC.
In order to shift the zero at input, supply reference voltage
to pin 21. The following formula shows how much the zero
shifts. (input signal at pin 20 = V
IN
; output signal at pin 1 =
V
OUT
; reference voltage = V
REF
; zero shift = V
OUTSHIFT
.)
10kΩ
V
OUTSHIFT
= - (––––––)
×
V
REF
R1
(10kΩ+R1)
V
OUT
= –––––––––
×
V
IN +
V
OUTSHIFT
R1
In order to attenuate input signal, connect a resistor to pin
22. The following formula shows the attenuated output.
R2
V
OUT
= (––––––––––––)
×
V
IN
R2 + 6.08 k
Ω
External resistors and adjusters make zero and span ad
-
justment available.
M-SYSTEM WARRANTY
M-System warrants such new M-System product which it manufactures to be free from defects in materials and workmanship during the 36-month period following the date that such
product was originally purchased if such product has been used under normal operating conditions and properly maintained, M-System’s sole liability, and purchaser’s exclusive
remedies, under this warranty are, at M-System’s option, the repair, replacement or refund of the purchase price of any M-System product which is defective under the terms of this
warranty. To submit a claim under this warranty, the purchaser must return, at its expense, the defective M-System product to the below address together with a copy of its original
sales invoice.
THIS IS THE ONLY WARRANTY APPLICABLE TO M-SYSTEM PRODUCT AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. M-SYSTEM SHALL HAVE NO LIABILITY FOR CONSEQUENTIAL, INCIDENTAL OR
SPECIAL DAMAGES OF ANY KIND WHATSOEVER.
M-System Co., Ltd., 5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN, Phone: (06) 6659-8201, Fax: (06) 6659-8510, E-mail: [email protected]
■
PIN ASSIGNMENT
NO.
FUNCTION
1
Current Output (+)
2
Current Output (-)
3
NC
4
NC
5
NC
6
NC
7
Excitation (+)
8
Excitati
on (-)
9
Excitation (COM)
15
Power Supply (+)
16
Power Supply (-)
17
Synchronous Input
18
Synchronous Output
19
Input (-)
20
Input (+)
21
Input Amplification
22
Input Attenuation
33
NC
34
NC
35
NC
36
NC
CHECKING
1) Terminal wiring: Check that all cables are correctly con-
nected 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.
ADJUSTMENT PROCEDURE
This unit is calibrated at the factory to meet the ordered
specifications, therefore you usually do not need any cali-
bration.
For matching the signal to a receiving instrument or in case
of regular calibration, adjust the output as explained in the
following.
■
HOW TO CALIBRATE THE OUTPUT SIGNAL
Use a signal source and measuring instruments of sufficient
accuracy level. Turn the power supply on and warm up for
more than 10 minutes.
1) ZERO: Apply 0% input and adjust output to 0%.
2) SPAN: Apply 100% input and adjust output to 100%.
3) Check ZERO adjustment again with 0% input.
4) When ZERO value is changed, repeat the above proce
-
dure 1) – 3).
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.
