DPM125L【PDF 2/2 页】METER DPM LCD3.5DIGIT 200MV BKLT

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Sheet目录221

1页 [2页]

Analogue inputs must be no closer than 1V to either the positive or negative supply.

Martel Electronics, Corp. P.O. Box 770 Londonderry, NH 03053

Toll Free: (800) 821-0023 Phone: (603) 434-1433 Fax: (603) 434-1653

PIN FUNCTIONS

1. DP1 199.9

2. DP2 19.99 Connect to V+ to display required DP.

3. DP3 1.999

4. TEST Connect to V+ to display segments as illustrated. It should not be operated for more than a few seconds as the d.c. voltage applied

to the LCD may 'burn' the display. This pin is normally at 5V below V+ and is the ground for the digital section of the meter. It can be

used to power external logic up to a maximum of 1mA.

5. V- Negative power supply connection.

6. V+ Positive power supply connection.

7. IN HI Positive measuring differential input.

8. INLO Negative measuring differential input.

9. COM The ground for the analogue section of the A/D converter, held actively at 2.8V (nom.) below V+. COM must not be allowed to sink

excessive current (>100 μ A) by connecting it directly to a higher voltage.

10. RLO Negative input for reference voltage (can be connected to COM via Link 3).

11. RHI Positive input for reference voltage (connected via Link 1 to ROH).

12. ROH Positive output from internal reference.

SAFETY

To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the module’s pins must not exceed 60Vdc. If voltages to the

measuring inputs do exceed 60Vdc, then fit scaling resistors externally to the module. The user must ensure that the incorporation of the

DPM into the user ’s equipment conforms to the relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for

Measuring, Control and Laboratory Use).

V+ V+

IN HI

±200mV

IN HI

IN LO

5 min. 5

V-

V+

IN HI

IN LO

VARIOUSOPERATINGMODES

ON-BOARD LINKS: In order to quickly and easily change operating modes for

different applications, the meter has several on-board links. They are designed

to be easily cut (opened) or shorted (soldered).

Do not connect more than one meter to the same power supply if the meters cannot

use the same signal ground. Taking any input beyond the power supply rails will

damage the meter.

6 6

±200mV

V- 1V V-

V-

Check Links 2 & 3 are SHORTED. Check Link 3 is SHORTED.

14V max

7V min

Normally

SHORTED

Cut to

OPEN

V+

510K

10K

SUPPLY

VOLTAGE 8

510K V-

V-

Check Link 3 is SHORTED.

Normally

OPEN

Solder to

SHORT

V+

+ 7 IN HI

- 10 REF LO

V-

7 V+

6R2

5K IN LO

COM

I OUT

V-

Measuringafloatingvoltagesource

of 200mV full scale.

V+

+ IN HI

R -

- 8 IN LO

R=0.2

IF.S.R. V-

5 V-

Check Links 2 & 3 are SHORTED.

Measuring current. Supply MUST

be isolated.

Split supply operation.

V+

V 1

- IN LO

+ 11 REF HI

V 2

V-

Check Links 1 & 4 are OPEN.

Measuring the ratio of two voltages.

Reading = 1000 V 1 /V 2

50mV< V 2 <200mV

V 1 <2V 2 .

Measuring a supply voltage.

(min. 7.5V, max. 14V).

V+

I IN 6

IN HI

100K

SET

ZERO

V-

Check Link 3 is SHORTED.

Measuring 4-20mA to read 0-999.

(supply MUST be isolated).

Specifications liable to change without prior warning

DPM 125

Issue 3

August/1997

M.C.

Applies to DPM 125/2

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