DPM500L-20 Martel Electronics, DPM500L-20 Datasheet - Page 2

• Manufacturer Part Number: DPM500L-20
• Description: METER DPM LCD 3.5DIGIT 20V BKLT
• Manufacturer: Martel Electronics
• Type: Voltmeterr

Specifications of DPM500L-20

• Display Style: Black Characters, Grey Background
• Display Type: LCD
• Display Digits: 3.5
• Backlight: Without
• Mounting Type: Panel Mount
• Voltage - Supply: -
• Termination: -
• Measuring Range: -
• Display Face Size: -
• Display Digits - Height: -
• Other names: 227-1014

Specifications liable to change without prior warning
PIN FUNCTIONS
1, 40. V+
2 -7, 12-14, 17, 38, 39 See
16, 18, 19, 22
32. COM
33. REF-
34. REF+
35. REF LO
36. REF HI
37. TEST
LED BACKLIT VERSIONS:
E.g. For 9V use 150R. Maximum current = 60mA.
SPECIAL NOTE: ANNUNCIATORS:
annunciators are normally ‘floating’, under certain conditions they may appear when not wanted. To suppress unwanted annunciators, link them to
the backplane (BP). If the annunciators are being switched, connect them via a 1M resistor to the BP (pin 21). The annunciators will then operate
normally when connected to XDP . Ensure that an annunciator is not connected directly to the XDP and BP at the same time.
15. -
20. POL
21. BP
23. DP3
24. DP2
25. DP1
26. V-
27. XDP
28. -5V
29. BG
30. IN LO
31. IN HI
40. V+/CLK
VARIOUS OPERATING MODES
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 opened(cut) 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.
Measuring a floating voltage
source of 200mV full scale.
Measuring current
(supply MUST be isolated).
R=
±200mV
R
I
0.2
Links 1, 2, 3 & 4 SHORTED.
FSR
Links 1, 2, 3, 4 SHORTED.
Positive power supply.
Input for the polarity annunciator. Internally linked to POL (pin 20). If this is to be externally controlled, cut link 11.
Drive for "-" annunciator. Internally connected by link 11.
LCD backplane drive waveform.
1.999
19.99
199.9
Negative power supply. Note that if the DPM 500S-BL is being used, the voltage between V+ and V- must not exceed 6.5V.
Connect to required annunciators/DPs (see note).
Output from negative rail generator circuit. This output is an inversion of V+ (DPM 500S BL ONLY).
Input for bandgap reference. (1.22V nom).
Negative measuring input. Analogue inputs must be no closer than 1V to either the positive or negative supply. The negative
Positive measuring input.
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 A) by connecting it directly to a higher voltage.
Negative output from internal reference.
Positive output from internal reference.
Negative input for reference voltage.
Positive input for reference voltage.
Connecting this pin to V+ turns on the segments as illustrated. It should not be operated for more than a few seconds as the DC
of the meter, it can be used as a negative supply to power external logic up to a maximum of 1mA.
Normally tied to V+ via Link 12 but can be used to over ride the internal oscillator and control the sample rate by cutting Link 12 and
making Link 13.
XB3, E3, AB, XG3. Outputs for use in auto-ranging applications.
voltage applied to the LCD may "burn" the display. This pin is nominally at 5V below V+ and is the ground for the digital section
+
-
30
31
30
31
IN LO
IN HI
IN LO
IN HI
SPECIAL NOTE: ANNUNCIATORS.
See
V-
Apply 5V DC to the backlight tab on the side of the meter. Typical current is 30mA. For higher voltages, fit a resistor in series.
V+
V-
V+
1
26
1
26
SPECIAL NOTE: ANNUNCIATORS.
V+
V-
V+
V-
Martel Electronics, Corp. P.O. Box 770 Londonderry, NH 03053
Toll Free: [phone] Phone: [phone] Fax: [phone]
The DPM annunciators (DPs, °C, etc.) can be displayed by connecting them to XDP . However as these
supply of the DPM 500S-BL is generated internally and mirrors the positive supply voltage.
±200mV
DPM 500
Measuring the ratio of two voltages.
Reading = 1000 V /V
50mV< V <200mV
V <2V .
Split supply operation (DPM 500).
1
1V min
0V
Links 1, 3 & 4 SHORTED.
2
V
V
+
-
2
1
2
+
+
-
-
30
31
30
36
35
31
IN HI
IN LO
IN LO
REF HI
REF LO
IN HI
Issue 4
1
V+
V-
V-
V+
26
1
1
26
2
V+
V-
14V max
7V min
V-
V+
July/1999
Normally
SHORTED
Cut to
OPEN
6R2
I
Measuring 4-20mA to read 0-999
(supply must be isolated).
Measuring a single ended input
referenced to supply (DPM 500S-BL).
OUT
I
M.C.
IN
±200mV
Links 1, 3 & 4 SHORTED.
Links 1, 3 & 4 SHORTED.
220K
5K
+
-
31
30
30
32
31
Applies to DPM 500/7
IN
IN
IN HI
COM
IN LO
HI
LO
V-
V+
V-
V+
1
26
1
26
V-
0V
V+
Normally
OPEN
Solder to
SHORT
V+