DATEL DMS-40PC-3-YS, DMS-40PC-3-RS-BCD, DMS-40PC-3-RS, DMS-40PC-3-RL-BCD, DMS-40PC-3-RL Datasheet

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Actual Size

DMS-40PC Series

4½ Digit, LED Display

Precision, Miniature

Digital Panel Voltmeters

Features

•Precision, autozeroing, factorycalibrated A/D converter

•Scientific-grade accuracy, ±2 counts

•Miniature size:

2.17" x 0.92" x 0.56" 55mm x 23mm x 14mm

•Large (0.52"/13.2mm) LED display

•Choice of red, green or yellow colors

•High-intensity or low-power red LED's optional

•Single +5V supply (175mW for lowpower models)

•Epoxy-encapsulated, 12-pin DIP with built-in color filter and bezel

•3 differential input voltage ranges

•DISPLAY HOLD and TEST functions

•Optional BCD data outputs for CPU interface

•0 to +50°C temperature range

DMS-40PC Series, 4½ Digit, LED Display, Miniature DPM's are fully self-contained, component-like, plug-in meters that provide scientific-grade accuracy (typically ±2 counts or ±0.005% of full scale) and outstanding reliability at a very affordable price.

Within its miniature (2.17" x 0.92" x 0.56"), epoxy-encapsulated package, each meter contains a precision reference circuit; a high-resolution, autozeroing, factorycalibrated A/D converter; and a large (0.52"/13.2mm), easy-to-read, LED display.

LED's are available in red, yellow and green colors. Red LED's are also offered in high-intensity or low-power versions.

The versatile design of the DMS-40PC Series assures trouble-free installation and long-term operation. Differential input voltage ranges include ±2V, ±20V and ±200V. Input impedance is a minimum 800kΩ . Non-inverting inputs are overvoltage protected to ±250V, and CMRR is typically 86dB (dc to 60Hz).

The DMS-40PC's epoxy-encapsulated package has an integral bezel and color filter. The moisture and vibration-proof package is extremely rugged and well suited for harsh environments and extended temperatures. Devices are fully specified for

0 to +50°C operation.

All models operate from a single +5V supply and typically consume 500mW. Lowpower models, whose display is just as bright as standard models, typically consume 175mW. DISPLAY TEST and HOLD functions are standard on each meter, and a complete set of BCD outputs are optional for sending data to CPU's or remote displays.

1	+5V			12
		V+
+5V SUPPLY				(–) INPUT LO
			1
			R2
		–5V	0.01µF
2	DC/DC		R1	11
DISPLAY TEST	CONVERTER	V–		(+) INPUT HI
			909k
3		A/D		10 ANALOG
				COMMON
5V RETURN
	0 Vdc	CONVERTER
4		DATA	2.5V
			REF.
DP 3
				9
5				DISPLAY HOLD
DP 2
				8
				DP4
6			+5V
DP 1				7
				REFERENCE IN/OUT

1 R2 is not used on ±2V (-1) models.

R2 = 101k on ±20V (-2) models and 9.2k on ±200V (-3) models.

Figure 1. DMS-40PC Series Simplified Schematic

DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • Email: [e-mail] • Internet: www.datel.com

DMS-40PC	4 ½ D I G I T , L E D D I S P L A Y D I G I T A L P A N E L V O L T M E T E R S

Performance/Functional Specifications

Typical at TA = +25°C and supply voltage = +5V using the single-ended input circuit, unless otherwise noted.

Analog Inputs	Min.	Typ.	Max.	Units
Full Scale Input Range:
DMS-40PC-1	--	±2	--	Volts
DMS-40PC-2	--	±20	--	Volts
DMS-40PC-3	--	±200	--	Volts
Input Impedance:
DMS-40PC-1	100	1000	--	MΩ
DMS-40PC-2, -3	0.8	1	--	MΩ
Overvoltage Protection	--	--	±250	Volts
Common Mode Voltage Range	--	--	±2	Volts
CMRR (dc to 60Hz)	--	86	--	dB

Control Inputs
Decimal Point Placement (Pins 4-6, 8)		Tie to pin 3 to activate
Display Test (Pin 2)	Tie to pin 3 to activate all segments
Display Hold (Pin 9)	Tie to pin 3 to hold last reading
BCD Outputs
Logic levels (1 LSTTL load max.):
Logic "1"	+2.4	--	--		Volts
Logic "0"	--	+0.4	+0.8		Volts
Performance
Sampling Rate		2.5 samples per second
Accuracy (15 minute warm-up):
DMS-40PC-1 (VIN = +1.9V)	--	±2	±3		Counts
DMS-40PC-2 (VIN = +19V)	--	±3	±4		Counts
DMS-40PC-3 (VIN = +190V)	--	±3	±4		Counts
Zero Reading (VIN = 0 Volts)	"– 0001"	"0000"	"0001"
Temperature Drift (0 to +50°C):
DMS-40PC-1	--	±0.4	±1		Cnts/°C
DMS-40PC-2, -3	--	±0.4	±1.5		Cnts/°C
Power Supply Requirements
Supply Voltage	+4.75	+5.00	+5.25		Volts
Supply Current:
Standard Models	--	+100	+140		mA
Low-Power Models	--	+35	+50		mA
Display
Display Type and Size	4½ Digit LED, 0.52"/13.2mm high
Polarity Indication	Autopolarity ("–" for negative VIN)
Overrange Indication	"–0000" (flashing) for negative VIN
	"0000" (flashing) for positive VIN
Physical/Environmental
Operating Temperature	0	--	+50		°C
Storage Temperature	–20	--	+75		°C
Humidity (Non-condensing)	0	--	95		%
Case Material		Polycarbonate
Weight		0.75 ounces (21 grams)

Applies for transient or continuous overvoltages applied to (+) INPUT HI (pin 11) with (–) INPUT LO (pin 12) properly connected. Pin 12 is not overvoltage protected (see Figure 1). Voltages applied to pin 12 should not exceed the supply voltage.

See Technical Notes.

BCD outputs are optional and must be specified in the part number. See Ordering Information.

Includes high-intensity and BCD-output models.

Order on-line at www.datel.com

Ordering Information

DMS-40PC - 1 - R S

									LED Color:
									GS = Standard Green
	Input Range:
									RH = High-Intensity Red
	1 = ±2V								RL = Low-Power Red
	2	= ±20V							RS = Standard Red
	3	= ±200V							YS = Standard Yellow

BCD Output Models:

BCD outputs are only available on standard red meters.

DMS-40PC-1-RS-BCD for ±2V input range

DMS-40PC-2-RS-BCD for ±20V input range

DMS-40PC-3-RS-BCD for ±200V input range

DMS-40PC-1-RL-BCD for ±2V input range

DMS-40PC-2-RL-BCD for ±20V input range

DMS-40PC-3-RL-BCD for ±200V input range

Accessories:
DMS-30-CP	Panel cutout punch
DMS-BZL1	DMS-40 bezel assembly
DMS-BZL2	DMS-40 bezel assembly with sealing gasket
DMS-EB	Application/evaluation board with standard
	MOLEX connector, decimal point solder pads
	and attenuation resistor pads.

A panel-mount retaining clip is supplied with each model.

Technical Notes

1.ANALOG COMMON (Pin 10): This pin is an internal, low-noise ground for the DMS-40PC. It is internally connected to pin 3 (5V RETURN). Do not connect pin 10 to either pin 3 or your

system ground as this will create a ground loop and possibly result in erroneous readings.

2.REFERENCE INPUT/OUTPUT (Pin 7): This pin accesses the meter's internal 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 desirable for the meter’s reference to track an external reference. See Ap Note 3 in the DATEL Panel Meter Catalog for more details.

3.DISPLAY TEST (Pin 2): Connecting pin 2 to ground (pin 3, 5V RETURN) will activate all LED segments, and the display will read "–18888" regardless of the actual applied input. To reduce selfheating, the display should not be left in the "test" mode for more than 10 seconds. This pin should be left open if unused.

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.

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