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參數(shù)資料
| 型號(hào)： | DMS-30PC-2-QS |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 3 1/2 DIGIT LED DISPLAY LOW POWER MINIATURE DIGITAL PANEL VOLTMETERS |
| 中文描述： | 3 1 / 2位LED顯示小功率微型數(shù)字面板電壓表 |
| 文件頁(yè)數(shù)： | 3/6頁(yè) |
| 文件大小： | 155K |
| 代理商： | DMS-30PC-2-QS |
3
3 D I G I T, L E D D I S P L AY D I G I TA L PA N E L V O LT M E T E R S
DMS-30PC
Applications
1. Single-Ended Input Configurations:
True single-ended
measurements can be made with any DMS-30PC meter. The
circuit of Figure 2 avoids problems normally associated with
ground-loop currents. Separate ground runs should be used for
5V RETURN (pin 3) and (–) INPUT LO (pin 12). This will ensure
that large LED currents will not flow in the wiring that connects
V
IN
to (–) INPUT LO (pin 12). Ground-loop currents can cause
unstable readings.
Figure 2. Single-Ended Input Configuration
DMS-30PC meters are highly versatile devices that can be used in
hundreds of applications. The application circuits chosen for this
section have historically received many inquiries. Every attempt has
been made to ensure technical accuracy, and all of the following
circuits have been prototyped and tested to ensure functionality.
Please keep in mnd, however that real-world applications are
seldomas straightforward as the approaches presented here. Most
applications have many more components — and many more
connections — than the illustrations show
The simplified schematic shown in Figure 1 can be very useful when
debugging a malfunctioning panel meter circuit, particularly if the
user has some knowledge of operational amplifiers (op amps). The
meter's high-impedance input consists of an op amp powered froma
±5Vdc power supply (the –5V is internally generated). Knowing this,
one can easily see why input signals applied to (–) INPUT LO and
(+) INPUT HI have to be kept within the power supply rails of ±5V.
Also note that only pin 11 has a current-limting 909k
series
resistor. High input voltages that have a common ground with pin 3
(5V RETURN) should only be applied to pin 11 ((+) INPUT HI) and
never to pin 12. In these high-voltage cases, pin 12 should always
be tied to pin 3 (5V RETURN).
One of the simplified schematic's noteworthy features is that it
shows internal voltage values. It also shows that pin 3 is the meter's
zero-volt reference point — regardless of the type of power or signal
source used. This is an important point to keep in mnd when a
digital or analog multimeter is used to make systemmeasurements.
The multimeter's negative lead (usually the black one) must be
connected to pin 3 (5V RETURN).
4. DISPLAY TEST (Pin 2):
Connecting pin 2 to +5V SUPPLY (pin
1) will activate all LED segments, except the decimal points, and
the display will read "1888" regardless of the actual applied input.
If a negative input is applied, DISPLAY TEST will also activate
the mnus sign.
To protect the LED's, the display should not
be left in the "test" mode for more than 10 seconds
.
5. Decimal Point Placement:
The location of the decimal point is
user-selectable, and the decimal point control pins (DP1-DP3)
are active low functions. Select the desired decimal point by
tying the appropriate pin (pin 4, 5 or 6) to pin 3 (5V RETURN).
Unused decimal point location pins should be left open.
Hard wiring is preferable, however, you can use logic gates to
exercise dynamc control over the location of the decimal point if
the following drive conditions are met:
Model
DMS-30PC-X-RL
DMS-30PC-X-BS
All Others
Applied "0" Voltage
+0.05V max.
+0.3V max.
+0.4V max.
Load Current*
0.7mA max.
18mA max.
6mA max.
* The driving gates must be able to sink this much current
(I
OL
) with a logic "0" output.
6. Gain Adjust:
There is a gain-adjust potentiometer on the back
of each meter. It has approximately ±50 counts (±2.5%) of
adjustment range. Since these devices essentially have no zero/
offset errors, a gain adjustment is effectively an overall accuracy
adjustment. Though they may be performed at any point (except
zero), accuracy adjustments are most effective when performed
with higher level input signals. The circuit shown in Figure 10
provides ±10% range of adjustment.
7. Soldering Methods:
All models in the DMS-30PC Series easily
withstand most common wave soldering operations. We
recommend, however, that you evaluate the effects your
particular soldering techniques may have on the meter's plastic
case and high-precision electrical performance. We recommend
the use of water-soluble solders and thorough cleaning
procedures.
8. Suggested Mating Connectors:
Panel mounted:
Connector housing
Termnal type
Crimping tool
Wire size
Insulation diameter
Stripping length
DATEL P/N 39-2079400
DATEL P/N 39-2099090
DATEL P/N 39-2099000
22 to 26 AWG
0.062" (1.57mm maximum
0.100 to 0.125" (2.54 to 3.17mm
Board mounted:
Socket
DATEL P/N 39-2359625
1
12
3
5V RET
+5V SUP
(–) IN LO
DATEL
UPA-5/500
120 VAC
11
(+) IN HI
6
DP1
+
–
AC to DC Converter
V
IN
DMS-30PC-1
8
REF OUT
7
REF IN
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DMS-30PC-2-RH | 3 1/2 DIGIT LED DISPLAY LOW POWER MINIATURE DIGITAL PANEL VOLTMETERS |
| DMS-30PC-2-RL | 3 1/2 DIGIT LED DISPLAY LOW POWER MINIATURE DIGITAL PANEL VOLTMETERS |
| DMS-30PC-2-RS | 3 1/2 DIGIT LED DISPLAY LOW POWER MINIATURE DIGITAL PANEL VOLTMETERS |
| DMS-30PC-2-YS | 3 1/2 DIGIT LED DISPLAY LOW POWER MINIATURE DIGITAL PANEL VOLTMETERS |
| DMS-30PC-3-AS | 3 1/2 DIGIT LED DISPLAY LOW POWER MINIATURE DIGITAL PANEL VOLTMETERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DMS-30PC-2-QS-C | 功能描述:數(shù)字面板表 3.5 Digit +-20VInput Std Aqua RoHS:否 制造商:Murata Power Solutions 設(shè)備類型:AC Voltmeters 顯示器類型:LED, 3 Digit, Red 工作電源電壓:85 VAC to 264 VAC 工作電源電流:50 mArms 輸入電流:50 mA 輸入頻率: 輸入電壓:120 VAC 系列:DMS-20PC-1-LM |
| DMS-30PC-2-RH | 功能描述:數(shù)字面板表 3.5 Digit +-20VInput Intense Red RoHS:否 制造商:Murata Power Solutions 設(shè)備類型:AC Voltmeters 顯示器類型:LED, 3 Digit, Red 工作電源電壓:85 VAC to 264 VAC 工作電源電流:50 mArms 輸入電流:50 mA 輸入頻率: 輸入電壓:120 VAC 系列:DMS-20PC-1-LM |
| DMS-30PC-2-RH-C | 功能描述:數(shù)字面板表 3.5 Digit +-20VInput Intense Red RoHS:否 制造商:Murata Power Solutions 設(shè)備類型:AC Voltmeters 顯示器類型:LED, 3 Digit, Red 工作電源電壓:85 VAC to 264 VAC 工作電源電流:50 mArms 輸入電流:50 mA 輸入頻率: 輸入電壓:120 VAC 系列:DMS-20PC-1-LM |
| DMS-30PC-2-RL | 功能描述:數(shù)字面板表 3.5 Digit +-20VInput Low Power Red RoHS:否 制造商:Murata Power Solutions 設(shè)備類型:AC Voltmeters 顯示器類型:LED, 3 Digit, Red 工作電源電壓:85 VAC to 264 VAC 工作電源電流:50 mArms 輸入電流:50 mA 輸入頻率: 輸入電壓:120 VAC 系列:DMS-20PC-1-LM |
| DMS-30PC-2-RL-C | 功能描述:數(shù)字面板表 3.5 Digit +-20VInput Low Power Red RoHS:否 制造商:Murata Power Solutions 設(shè)備類型:AC Voltmeters 顯示器類型:LED, 3 Digit, Red 工作電源電壓:85 VAC to 264 VAC 工作電源電流:50 mArms 輸入電流:50 mA 輸入頻率: 輸入電壓:120 VAC 系列:DMS-20PC-1-LM |
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