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DMS-30DR Series
Sunlight Readable, 3? Digit Panel Meters
accuracy and temperature drift of the meter. A ±1% 1.82K limiting
resistor is connected between the reference IC and pin 9.
4. ANALOG COMMON (Pin 10): This pin is connected to an internal,
low-noise, “relative” ground. Pin 10 also serves as the internal
ground for the +1.225V reference IC. ANALOG COMMON is used
in certain differential and “?oating” measurements as described in
the Applications section of this data sheet, and in DMS Applica-
tion Note 3. For the vast majority of applications, pin 10 should not
be connected to pin 3 (5V RETURN), or to your system’s analog
ground.
5. REFERENCE OUTPUT (Pin 8) and INPUT (Pin 7): Pin 8 is a preci-
sion reference actively trimmed at the factory. For normal operation,
pin 8 must be tied to pin 7 to achieve all listed accuracy and drift
speci?cations.
6. 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 appro-
priate 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 dynamic control over
the location of the decimal point if the following drive conditions are
met:
Applied “0” Voltage: +0.4V max
Drive Current*: 6mA max.
* The driving gates must be able to sink this much current (IOL)
with a logic “0” output.
7. Gain-Adjust Potentiometer: The gain-adjust potentiometer located
on the rear of the meter has approximately ±50 counts (±2.5%)
of adjustment range with a near full-scale input. 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 input level except zero, accuracy adjustments are
most effective when performed with half-scale (or higher) positive
input signals.
If a wider adjustment range is required, an external potentiometer
circuit can be con?gured using the meter’s +1.225V reference
output (pin 9). The circuit shown in Figure 9 provides ±10% range
with Auto-Dimming LED Displays
APPLICATIONS
DMS-30DR meters are highly versatile devices that can be used in
hundreds of applications. The application circuits chosen for this sec-
tion 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, however, that real-world applications are seldom as straight-
forward as the approaches presented here. Most applications have
many more components — and many more connections — than the
illustrations show.
The simpli?ed 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 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). 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-limiting 909k Ω 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-volt-
age cases, pin 12 should always be tied to pin 3 (5V RETURN).
One of the simpli?ed 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 mind when a digital
or analog multimeter is used to make system measurements. The
multimeter's negative lead (usually the black one) must be connected
to pin 3 (5V RETURN).
1. Single-Ended Input Con?gurations: True single-ended measure-
ments can be made with any DMS-30DR 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
?ow in the wiring that connects V IN to (–) INPUT LO (pin 12). Ground-
loop currents can cause unstable readings.
of adjustment.
11
DMS-30DR-1
8
8. Soldering Methods: All models in the DMS-30DR Series easily
withstand most common leaded or lead-free soldering opera-
tions, performed either manually or by wave soldering machines.
+
–
V IN
(+) IN HI
REF OUT
However, users should evaluate the effects their particular soldering
techniques may have on the meter’s plastic case and precision
electrical performance. We highly recommend using low residue,
12
(–) IN LO
1
+5V SUP
6
DP1
3
5V RET
7
REF IN
no-clean solders.
9. Suggested Mating Connectors:
Panel mounted: Connector housing P/N 4320-01069-0
Terminal type: P/N 4400-01032-0
Crimping tool: P/N 39-2099000
Wire size: 22 to 26 AWG
Insulation diameter: 0.062” (1.57mm) maximum
Stripping length: 0.100 to 0.125” (2.54 to 3.17mm)
Board mounted: Socket: P/N 4320-01074-0
85-264Vac
AC to DC Converter
Figure 2. Single-Ended Input Con?guration
www.murata-ps.com/dpm
03 Aug 2010
email: sales@murata-ps.com
MPM_DMS-30DR.B05 Page 3 of 6
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