User's Manual
MS3716
Slim Plug-In First-Order Delay Signal Conditioner with Isolated Single/Dual Output
Rev. 1.40
4
10. Time Constant Setting
You can use the time constant setting trimmer on the front panel to
set a time constant for first-order delay within the range of time
constants you have specified when ordering.
The trimmer has scales as shown. Use these scales as a guide
to set the time constant.
Percentage figures shown
(12.5% - 87.5%) are for
illustrative purposes only and
NOT printed on the product.
Note:
After the setting, follow these steps to verify the time constant.
(1) Connect the unit as illustrated below. (Connections must be
made with all devices powered off.)
OSCILLOSCOPE
POWER SUPPLY
CALIBRATED
ADJUSTABLE
VOLTAGE/CURRENT
SOURCE
Example of I/O
Waveforms
(2) Power on the devices and perform a warm-up for at least 30
minutes. Note that insufficient warm-up will lead to
inaccurate measurements.
(3) Apply a step input from 0% to 100% of the input range of the
MS3716 unit
and observe the input and output waveforms
on the oscilloscope.
(4) Read time t shown in the above example to determine the
time constant.
(5) Adjust the trimmer and repeat steps (3) and (4) until you get
a desired time constant.
11. Adjustment
Since the unit is precisely factory-adjusted before shipment, no
further adjustment is needed at the user’s side. Adjustment of signal
conditioners requires technical expertise and fine craftsmanship. We
recommend that you use adjustment service of MTT to save costs
and ensure accuracy. Please contact MTT or its local
representatives. Just for your reference, the adjustment procedure
is described below.
11-1. Preparation
For the terminal assignments, refer to section 5.
The wiring work should be performed with no power applied to
the instrument.
Wiring should be connected to the terminal block.
At least 30 minutes of warm-up is required before adjustment.
The accuracy of measuring equipment to be used for calibration
must be much higher than that of the instrument to be adjusted.
Since the ZERO and SPAN Trimmers work on both the output 1
and output 2, adjustment should be performed on the output 1.
(Adjustment of the output 1 has the same effect on the output 2.)
11-2. Adjustment Procedure
(1) Connect the unit as illustrated below.
(2) Adjust the voltage or current source to generate a signal
equivalent to 0%* of the input range of the unit.
(3) Slowly turn the ZERO Trimmer to get 0%* output while applying
0%* input as above.
(4) Adjust the voltage or current source to generate a signal
equivalent to 100% of the input range of the unit.
(5) Slowly turn the SPAN Trimmer to get 100% output while
applying 100% input as above.
(6) Repeat steps (2) through (5) until zero and span are precisely
adjusted.
(7) Adjust the voltage or current source to generate 25%, 50% and
75% of the input signal range of the unit and record the values
of output signals to confirm they are linearly proportional.
* For 0 to 20mA output, 0% should be interpreted as 0.5%.
CALIBRATED
ADJUSTABLE
VOLTAGE/CURRENT
SOURCE
MULTIMETER
POWER SUPPLY
12. Maintenance and Inspection
Check the unit for proper characteristics and settings about once
every two years.
13. Warranty Period and Scope
[Warranty Period]
MTT’s hardware products are warranted for a period of seven (7)
years from the date of shipment.
[Warranty Scope]
1) MTT warrants that its hardware products are free from defects
in materials and workmanship and conform to its product
specifications.
2) MTT ships the products under its appropriate quality
management system and quality control, but does not warrant,
expressed or implied, that the operation, output, or indication
of the hardware will be uninterrupted or error free. MTT shall
not be liable and make no warranty for any damage to or any
safety or performance trouble in the customer’s or any other
third party’s equipment if the operation, output, or indication is
interrupted or faulty.
3) If, during the warranty period, the product proves to be
defective when used in accordance with the relevant user’s
manual, the product will be repaired or replaced.
4) This warranty does not apply to any malfunction or failure
resulting from the following:
a. Improper or incomplete maintenance or calibration,
b. Any other cause, which does not relate with the delivered
product,
c. Modification or repair by any person other than MTT, and
d. Natural disasters or other unavoidable accidents, for which
MTT is not liable.