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参数资料
| 型号： | DPM125L |
| 厂商： | Martel Electronics |
| 文件页数： | 2/2页 |
| 文件大小： | 0K |
| 描述： | METER DPM LCD3.5DIGIT 200MV BKLT |
| 其它图纸： | DPM125 Series |
| 标准包装： | 1 |
| 系列： | Legacy |
| 类型： | 伏特表 |
| 测量范围： | 0 ~ 199.9V |
| 显示器样式： | 黑色字符，灰色背景 |
| 显示器类型： | LCD |
| 显示器正面尺寸： | 1.22" L x 0.55" W（31.0 x 14.0mm） |
| 显示器位数： | 3.5 |
| 显示器位数 - 高度： | 0.492"（12.50mm） |
| 背光： | 无 |
| 安装类型： | 面板安装 |
| 端子： | PC 引脚 |
| 电源电压： | 7.5 ~ 14V |
| 其它名称： | 227-1008 |
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+
V+ V+
+
IN HI
±200mV
+
IN HI
-
IN LO
-
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
7
7
8
±200mV
8
0V
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+
6
510K
7
10K
SUPPLY
VOLTAGE 8
510K V-
5
V-
Check Link 3 is SHORTED.
Normally
OPEN
Solder to
SHORT
6
7
V+
+ 7 IN HI
8
- 10 REF LO
V-
7 V+
8
6R2
5K IN LO
COM
I OUT
V-
Measuringafloatingvoltagesource
of 200mV full scale.
V+
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.
6
V+
V 1
- IN LO
+ 11 REF HI
V 2
V-
5
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
9
V-
5
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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