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DMS-40PC Series
4? Digit, LED Display Digital Panel Voltmeters
4. DISPLAY HOLD (Pin 9) : For normal operation, this pin should be left
open. To hold the meter’s last reading and display it continuously, tie
pin 9 to ground (pin 3, 5V RETURN).
5. Decimal Point Placement : The location of the decimal point is user-
selectable, and the decimal point control pins (DP1-DP4) are active
low functions. Select the appropriate decimal point by tying pin 4,
5, 6 or 8 to pin 3 (5V RETURN). Unused decimal point location pins
should be left open.
Hard wiring is preferable, however, you can exercise dynamic control
over the location of the decimal point by employing drive circuits that
are capable of sinking a minimum of 20mA at voltages less than +0.4
Volts.
6. Gain Adjust : There is a gain-adjust potentiometer on the back of
each meter. It has approximately ±150 counts of adjustment range.
Since these meters 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 adjust-
ments are most effective when performed with higher level input
signals.
7. Soldering Methods : All models in the DMS-40PC Series easily
withstand most common wave soldering operations. We recom-
mend, 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 no-clean solders.
8. Suggested Mating Connectors:
Panel mounted:
show up as unstable display readings. When an input signal, assumed to
be exactly zero volts, has a 1mV (0.001V) ground-loop induced offset, it
is displayed as “0010” on a ±2V input-range meter! DATEL’s new Digital
Panel Meter Catalog contains an application note describing power sup-
ply wiring and ground loop avoidance techniques.
The DMS-40PC’s simpli?ed schematic, shown in Figure 1, can be very
useful when debugging a malfunctioning circuit, especially if the user
has some knowledge of operational ampli?ers (op amps). The meter’s
high-impedance input consists of an op amp powered from a ±5Vdc
power supply (the –5V is internally generated). Figure 1 shows that input
signals applied to (–) INPUT LO and (+) INPUT HI must to be kept within
the ±5V power-supply rails. Also note that only pin 11 has a current-
limiting 909kΩ series resistor. High input voltages that have a common
ground connection 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 simpli?ed schematic’s more noteworthy features is that it
shows some DMS-40PC internal voltage values and also 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 mind when
using digital multimeters to perform system-level measurements. The
multimeter’s negative lead (usually the black one) must always be con-
nected to pin 3 (5V RETURN). This is the only way accurate readings can
be made, particularly if the meter is con?gured for a differential input and
concerns arise regarding common-mode voltages.
1. Single-Ended Input Con?gurations : The DMS-40PC can measure
Connector housing
Terminal type
Crimping tool
Wire size
Insulation diameter
Stripping length
Board mounted:
Socket
APPLICATIONS
DATEL P/N 4320-01069-0
DATEL P/N 4400-01032-0
DATEL P/N 39-2099000
22 to 26 AWG
0.062” (1.57mm) maximum
0.100 to 0.125” (2.54 to 3.17mm)
DATEL P/N 4320-01074-0
single-ended signals with either positive or negative polarities. True
single-ended inputs always have one of their two terminals at the
same potential as the DMS-40PC’s 5V RETURN (pin 3). Single-ended
inputs are usually derived from power supplies that have a common
ground with the meter’s +5V supply. Figure 2 shows the recom-
mended connections to be used with this type of input. Pin 12, (–)
INPUT LO, is shown directly tied to ground. This connection to ground
must be a separate wire or pc-board trace originating at V IN ’s negative
terminal. This hook-up will normally eliminate display instabilities and
errors caused by ground-loop currents which can occur if
(–) INPUT LO is tied to ground at, or near, pin 3.
DMS-40PC Series meters are high-precision versatile devices that
can be used in many applications requiring a 0 to 19,999 count digital
11
DMS-40PC-1-GS
display. The application circuits chosen for this section are ones that
+
(+) IN HI
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 mind,
–
V IN
12
(–) IN LO
however, that real-world applications are seldom as straightforward as
the approaches presented here.
1
+5V SUP
6
DP1
3
5V RET
All inputs applied to DMS-40PC meters must be steady, dc values,
otherwise the input itself may cause display instabilities. Due to their 4?
digit resolution, DMS-40PC meters must be wired with greater care than
their 3? digit counterparts. Correct power-supply and input-signal wiring
— an absolute must! — helps eliminate ground-loop induced errors that
120 VAC
AC to DC Converter
Figure 2. Single-Ended Input Con?guration
www.murata-ps.com/support
09/27/11
MPM_DMS-40PC.C06 Page 3 of 6
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相关代理商/技术参数
DMS-40PC-1-RL-C
功能描述:数字面板表 4.5 Digit +-2V Input Low Power Red RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40PC-1-RS
功能描述:数字面板表 4.5 Digit +-2V Input Std Red RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40PC-1-RS-BCD
功能描述:数字面板表 4.5 Digit +-2V Input Std Red RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40PC-1-RS-BCD-C
功能描述:数字面板表 4.5 Digit +-2V Input Std Red RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40PC-1-RS-C
功能描述:数字面板表 4.5 Digit +-2V Input Std Red RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40PC-1-YS
功能描述:数字面板表 4.5 Digit +-2V Input Std Yellow RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40PC-1-YS-C
功能描述:数字面板表 4.5 Digit +-2V Input Std Yellow RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40PC-2
制造商:未知厂家 制造商全称:未知厂家 功能描述:4 1/2Digit, LED Display Precision, Miniature Digital Panel Voltmeters