DMS-40LCD-4/20S データシートの表示（PDF） - Murata Power Solutions
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DMS-40LCD-4/20S Datasheet PDF : 5 Pages
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Switch S2
SW3
SW4
SW5
SW6
DP1
DP2
DP3
DP4
OPERATING AND SETUP INSTRUCTIONS
The following procedure must be performed as the first re-calibration step
every time DIP-switches S1 and S2 are reconfigured to select a new display
range. The following procedure assumes the DMS-40LCD-4/20S is initially
completely mis-adjusted, i.e., both potentiometers and DIP-switches S1 and
S2 are randomly set. Make sure that all DIP-switch actuators are pushed as
far as they will go to their designated ON (closed) or OFF (open) positions.
1. Set R7 (gain/span adjust) and R3 (zero/offset adjust) fully clockwise,
roughly 20 turns, then using the settings found in the
selected
range, place the DIP-switches on S1 and S2 to the appropriate positions
for the desired display reading.
2. Apply a precision 4mA input with proper polarity and adjust R3
(top 20-turn potentiometer) until the meter’s display reads “0000”.
3. Apply a precision 20mA input and adjust R7 (bottom 20-turn potentiom-
eter) until the display reads the maximum desired reading. Repeat steps
2 and 3 to make sure the adjustments did not affect one another.
4. If necessary, select the appropriate decimal point by setting either
SW3, SW4, SW5, or SW6 of S2 to ON (DP1, DP2, DP3, or DP4,
respectively.
NOTE: Please keep in mind the transmitter’s 4mA and 20mA output accu-
racy may affect display readings which are at, or very close to, the high and
low limits of the selected range. See Example #2 below and Technical Note 1
for more information).
Examples
The examples below illustrate how to configure the meter to perform some
typical measurements. Recall that R3 and R7 must be set to their full clock-
wise position before calibrating the meter.
1. Desired display readings are:
4mA = “0.000”
20mA = “3.000”
S1
ON
1 2 34 56
S2
ON
1 2 34
Use DIP-switch setting #3 in Table 1 and enable decimal point DP2
by placing SW4 of switch S2 to ON. Apply 4mA and adjust R3 so the display
reads “0.000”. Apply 20mA and adjust R7 so the display reads “3.000”.
2. Desired display readings are:
S1
S2
4mA = “0000”
ON
ON
20mA = “8600”
1 2 34 56
1 2 34
Use DIP-switch setting #11. Apply 4mA and adjust R3 so the display reads
“0000”. Apply 20mA and adjust R7 so the display reads “8600”. If the trans-
mitter’s full-scale output is less than 20.0mA, it may not be possible to adjust
R7 for a reading of “8600” with setting #11. If this occurs, select setting #12
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DMS-40LCD-4/20S Series
Ultra-Low 2.9V Loop-Drop 4½ Digit
LCD Display Process Monitor
and re-calibrate both R3 and R7 to obtain “0000” and “8600”. Note that
for these display readings no decimal points are used. Set SW3, SW4,
SW5 and SW6 of switch S2 to OFF.
3. Desired display readings are:
4mA = “0000”
20mA = “10000”
S1
ON
1 2 34 56
S2
ON
1 2 34
Use DIP-switch setting #13. Apply 4mA and adjust R3 so the display
reads “0000”. Apply 20mA and adjust R7 so the display reads “10000”.
For these display readings no decimal points are used. Set SW3, SW4,
SW5 and SW6 of switch S2 to OFF.
4. Desired display readings are:
S1
S2
4mA = “.0000”
12mA = “.2500”
ON
1 2 34 56
ON
1 2 34
This example is not as straightforward as the previous three. Notice that
12mA is exactly halfway between 4mA and 20mA. If we assume the
input could go up to 20mA, the display reading would then be 2 x .2500
or “.5000”. From Table 1, select DIP-switch setting #7 and enable DP1
via SW3 of switch S2. Apply 4mA and adjust R3 so the display reads
“.0000”. Apply 12mA and adjust R7 so the display reads “.2500”.
Table 1. DIP-Switch Settings
Switch S1
Switch S2
Display Reading SW1 SW2 SW3 SW4 SW5 SW6 SW1 SW2
4mA 20mA
01. 0000 2250-2450 OFF ON ON ON OFF OFF ON ON
02. 0000 2450-2800 OFF ON ON ON OFF OFF OFF ON
03. 0000 2800-3200 OFF ON ON ON OFF OFF ON OFF
04. 0000 3200-3850 OFF ON ON ON OFF OFF OFF OFF
05. 0000 3850-4250 ON OFF ON ON OFF OFF ON ON
06. 0000 4250-4800 ON OFF ON ON OFF OFF OFF ON
07. 0000 4800-5500 ON OFF ON ON OFF OFF ON OFF
08. 0000 5500-6200 ON OFF ON ON OFF OFF OFF OFF
09. 0000 6200-6750 OFF OFF ON ON ON OFF ON ON
10. 0000 6750-7700 OFF OFF ON ON ON OFF OFF ON
11. 0000 7700-8600 ON ON OFF ON ON OFF ON ON
12. 0000 8600-9800 ON ON OFF ON ON OFF OFF ON
13. 0000 9800-10900 ON ON ON OFF OFF ON ON ON
14. 0000 10900-12000 ON ON ON OFF OFF ON OFF ON
15. 0000 12000-12800 ON OFF OFF ON OFF ON ON ON
16. 0000 12800-14000 ON OFF OFF ON OFF ON OFF ON
17. 0000 14000-15300 ON OFF ON OFF ON ON ON ON
18. 0000 15300-16300 ON OFF ON OFF ON ON OFF ON
19. 0000 16300-17600 OFF OFF ON OFF ON ON ON ON
20. 0000 17600-19999 OFF OFF ON OFF ON ON OFF ON
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MPM_DMS401LCD-420S.D02 Page 3 of 5
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