OEM24L ANDERS ELECTRONICS, OEM24L Datasheet - Page 2

• Manufacturer Part Number: OEM24L
• Description: DPM, LCD
• Manufacturer: ANDERS ELECTRONICS

Specifications of OEM24L

• Supply Voltage Range: 7V To 10V, 4.8V To 6V
• Backlighting Colour: Green LED Backlight
• No. Of Digits / Alpha: 3.1/2
• Display Size: 46.2mm X 17.3mm
• Panel Cutout Height: 32.5mm
• Panel Cutout Width: 63mm
• Operating Temperature: RoHS Compliant
• Operating Temperature Range: 0°C To
• Rohs Compliant: Yes

The OEM22/24L is designed for 9/5V supply. Incorrect
supply polarity will destroy the module immediately. It is
ready for general use when connected as in figure 1, for
9V supply. For 5V supply, the module must be calibrated
before use as follows. Connect as in figure 2, apply
100mV to the inputs, from a calibrated source and adjust
VR1 until the display reads 1000.
The input range is 0-200mV. Over-range is indicated by
blanking the three least significant digits and displaying a
"1" in the most significant digit.
For 9V operation it is recommended to power from a 9V
battery. The inputs are intended to float with respect to the
supply but if they do not float they must be no closer than
1.5V from either VDD or VSS (VDD-1.5V and VSS+1.5V).
See the circuits for non-floating inputs below.
The low BAT voltage can be set adjusting VR2 but it is not
recommended to operate with a supply voltage below 7V.
DC VOLTAGE MEASUREMENT
DC CURRENT MEASUREMENT
Revision 8 17/011/04
DC VOLTAGE OFFSET
NON FLOATING INPUTS (a)
USER INSTRUCTIONS
APPLICATION CIRCUITS
The input impedance becomes R1+R2. Choose accurate stable
resistors. Typically, R1=1MΩ. 9MΩ is a practical upper limit.
To measure voltages greater than 200mV
an attenuator is required.
EXAMPLES
10V 1500rpm
V
2V
V
IN
IN
anders
Where a single 5V supply is not
suitable but you must connect your
input signal ground to the module
supply ground, then either of these two
non-floating input circuits can be used.
Note that the module is set in the 9V
supply mode.
=V
Shunt resistance
It is important to note the power
dissipation in the shunt and choose
resistor rating accordingly
Tel: [phone] Fax: [phone] http://www.anders.co.uk
Display
1.999V
D
EXAMPLES
To achieve a zero display reading
for a non-zero voltage input,
apply the offset voltage between
COM and INLO.
For a positive offset apply a
Positive signal to INLO w.r.t.
COM.
Apply the input signal between
INHI and COM
P
x
S
R1+R2
Current
200mA
=
R2
2A
Vs
I
IN
electronics plc
2
199.9mV 1MΩ 110KΩ
150mV
= I
V
V
D
IN
D
0.1Ω
.
2
1Ω
R
max. is 199.99mV
R
R
S
S
S
1MΩ
R1
=
Ω
Vs
I
IN
0.04W
0.4W
P
Ω
15KΩ
S
R2
Bayham Place, London NW1 OEU UK
MULTI-RANGE DC CURRENT MEASUREMENT
NON FLOATING INPUTS (b)
All annunciators are connected to BP for suppression
purposes. To light up, cut the trace between the selected
annunciator pad and BP track and then link with solder
the annunciator pad to the XBP pad next to it.
For 5V operation, INLO must be connected to TST for
non-floating inputs (as fig. 2) and to the analogue common
pin COM for floating inputs. The low BAT annunciator
needs to be turned of by adjusting VR2.
MULTI-RANGE DC VOLTAGE MEASUREMENT
DC VOLTAGE RATIO MEASUREMENT
CONNECTION DIAGRAM
To determine the ratio between two
voltages apply the inputs as shown.
Displayed reading
Over range occurs when
Using the formulae choose resistors to
ensure the analogue inputs are no
closer than 1.5V from either VDD or
VSS (VDD-1.5V or VSS+1.5V)
BASIC CONFIGURATION
For multi-range, use a 2 pole,
5 way rotary switch. 1 pole for
range select and the other to
connect the appropriate
decimal point to XBP.
For multi-range, use a 2 pole,
4 way rotary switch. 1 pole for
range select and the other to
connect the appropriate
decimal point to XBP.
=
V2
V1
X 1000
V2
V1
>
2