dms-40lcd ETC-unknow, dms-40lcd Datasheet - Page 3

• Manufacturer Part Number: dms-40lcd
• Description: Panel Cutout Punch For Dms-30/40
• Manufacturer: ETC-unknow

3. Low Battery Annunciator: The “BAT” annunciator in the upper
4. HOLD/BACKLIGHT (Pin 9) Function: For non-backlit models, con-
5. ANALOG COMMON (Pin 10): This pin is connected to an internal,
6. REFERENCE IN/OUT (Pin 7): This pin accesses the meter’s internal
7. Gain Adjust: There is a gain-adjust potentiometer on the back of each
left-hand corner of the display turns on when the supply voltage for
5V-powered models falls below approximately +3.75V or when the
supply voltage for 9V-powered models falls below approximately 7.2V.
This function can not be disabled.
necting pin 9 (HOLD/BACKLIGHT) to pin 3 (5V RETURN/
–BATTERY) will hold (continuously display) the last reading.
If not used, pin 9 should be left open for these models.
For backlit models, grounding pin 9 (i.e. connecting it to pin 3) turns on
the backlighting LED’s. 9V-powered backlit models function with supply
voltages up to +14V, however, activating the backlight with voltages
greater than 9.2V can damage the meter. Therefore, a 1/4 Watt series
resistor must be installed between pins 3 and 9 in these situations. The
value of the series resistor is determined using the following formula:
In any backlit application, including those with supply voltages
drawn by the meter) can be reduced by installing a 1/4 Watt resistor
between pins 3 and 9. The brightness of the backlight will be reduced
proportionately.
low-noise, “relative” ground. It is used in certain “floating” measure-
ments as described in the Applications section of this data sheet and
Ap Note 3 of the DATEL Panel Meter Catalog. Pin 10 should not be
connected to pin 3 (5V RETURN/–BATTERY) or to your system’s
analog ground.
reference and is used during the factory calibration procedure. Pin 7
should be left open in most common applications. It can be used in
certain “ratiometric” applications in which it is desireable for the meter’s
reference to track an external reference. See the Applications section
of the DATEL Panel Meter Catalog for more details.
meter. It has approximately ±150 counts 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.
< 9.2V, the current drawn by the backlight (and therefore the current
R
R
R
Example: If +BATTERY (pin 1 with respect to pin 3) is +12.6V,
Series
Series
Series
= 97 Ohms
=
=
+BATTERY – 9.2V
+12.6 – 9.2V
0.035
0.035
Ohms
Ohms
www.murata-ps.com
8. Soldering Methods: All models in the DMS-40LCD Series easily
9. Suggested Mating Connectors:
DMS-40LCD meters are available in either 5V-powered or 9V-powered
models. 9V devices operate directly from 7.5V to 14V supplies (usually
batteries) without the need for external voltage regulators. 9V devices,
however, can not be used to measure voltages referenced to the negative
battery terminal (pin 3) because the minus input to the meter (pin 12, (–)
INPUT LO) must always be at least 1.5V above pin 3. 9V-powered meters
can only be used to make differential and not single-ended measurements.
5V-powered devices operate from any well-regulated +5V supply and will
accurately measure voltages both above and below pin 3 (5V RETURN) in
either single-ended or differential configurations.
APPLICATIONS
1. Single-Ended Input Configurations: True single-ended measure-
withstand most common wave soldering operations. We recommend,
however, 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.
Panel mounted:
Connector housing
Terminal type
Crimping tool
Wire size
Insulation diameter
Stripping length 0.100 to 0.125” (2.54 to 3.17mm)
Board mounted:
Socket
ments can only be made with 5V-powered meters. 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).
4½ Digit, LCD Display Digital Panel Voltmeters
+
120 VAC
–
V
IN
Technical enquiries email: [e-mail], tel:
AC to DC Converter
Figure 2. Single-Ended Input Configuration
UPA-5/500
DATEL
DATEL P/N 39-2099090
DATEL P/N 39-2099000
DATEL P/N 39-2359625
(–) IN LO
(+) IN HI
DMS-40LCD Series
11
12
(5V-Powered Models)
+5V SUP
DATEL P/N 39-2079400
22 to 26 AWG
0.062” (1.57mm) maximum
1
RANGE
DMS-40LCD-0/1-5
2
MPM_DMS40LCD.C02 Page 3 of 6
6
DP1
3
5V RET
[phone]