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O P E R A T I N G I N S T R U C T I O N S
Digital Voltmeter Module
Item-No. 12 65 97 DVM 220
Item-No. 12 66 95 DVM 320
Intended use
The module is intended for installation in other devices or casings. It displays direct currents ranging from 0
to 200 mV (DC). By means of individual, external circuits, other physical quantities such as direct current or
temperatures can also be displayed. The measuring units and decimals can be selected. The polarity is auto-
matically displayed.
A display light is integrated; it can be supplied with the operating voltage or with 12VDC.
The module must not be operated at voltages greater than 48 VDC (by an optional volt-
age divider). For a voltage over 48V the respective instructions concerning clearances
to air and leakage paths for shock protection must be complied with. Always observe
and adhere to the safe distance for dangerous contact voltages/wires.
The measuring input is separate from the power supply and must not be connected.
The power supply of the module comes from an external 9V-DC power supply unit.
The connection is at the back of the module in a pin contact strip. You will have to set some soldering links
for the selection of the measuring units. There is a data hold function to "freeze" the measuring value.
The product is only to be used in dry indoor locations. No part of the product must be modified or rebuilt!
Observe the safety instructions in their entirety!
Safety instructions and hazard warnings
Please read all of the operating instructions before using the product for the first time;
they contain important information about its correct use.
• The warranty will be void in the event of damage caused by failure to observe these safety instructions! We
do not assume any liability for any consequential damage!
• Nor do we assume any liability for material and personal damage caused by improper use or non-compli-
ance with the safety instructions! The warranty will be void in such cases.
• The module is not a toy and should be kept out of reach of children.
• The module is CE-conformant and complies with the required European directives.
• Please handle soldering irons with special care. Please follow these operating instructions. Heat the sol-
dered joint only as long as necessary and as short as possible.
Installation
Prepare the installation section. For the respective dimensions please see the enclosed data sheet. Press
the module into the prepared opening after connection.
Connection
A) Overview of the PCB
All the connections and functional soldering links are made on the back of the module.
B) Selection of the measuring unit
Select the necessary measuring unit and the decimal point you need for your
measuring section from the illustration on the right and set the respective sol-
dering link to "ON".
See example drawing.
Please set all the fields you do not need to "OFF", or they
cannot be blanked out clearly.
C) Connection of the pin contact strip CN1
The electric connection of the module is done in the pin contact strip CN1.
For the respective functions, please refer to the following table.
Pin
Description
Function
1
IN HI
Measurement input + (0 - 200 mV DC)
2
IN LO
Measurement input – (reference potential)
3
VDD
Operation voltage +9VDC
4
VSS
Operating voltage -
5
BL+
Display light +
6
BL-
Display light -
7
HOLD
Data hold (connection to VDD)
8
not assigned
VOLTCRAFT
°
Version 04/09
Measuring input „IN HI" and „IN LO"
"IN HI" and "IN LO" are differential inputs. They react to the voltage applied and not to the voltage relative to
the operating voltage. Only a direct voltage may be applied as the measurement voltage.
The voltage in the measuring input without voltage divider must not exceed ±3.5 V, or the module will be
®
destroyed.
The maximum voltage applied to the inputs is 48 V DC. If a higher voltage is to be meas-
ured, an appropriate measuring resistor must be installed externally.
Operating voltage "VDD" and "VSS"
The operating voltage (VDD) must be in the range of 9DC (-0.5V/+1V). Do not go below or above this volt-
age, because the measuring results would be inaccurate and the module would be destroyed.
If the operating voltage drops below 8.5V, the display shows
Replace the battery immediately or set the input voltage to the correct value.
Display light "BL+" and "BL-"
The display light can be switched on by applying a voltage of either 9VDC or 12VDC.
The series resistors for the lights (LEDs) are integrated in
the module. If the operating voltage is to be 9VDC, a sol-
dering link must be set at CN2 (see illustration). It remains
open for 12 V DC.
Data-Hold "HOLD"
The value currently displayed is frozen by contacting the "HOLD" (pin 7) to "VDD" (pin 3). The value will
remain in the display until the contacts are removed.
D) Internal reference voltage "VR1"
The internal reference voltage is set with VR1. The voltage has been calibrated to 100.0 mV in the factory, it
can be adjusted according to the respective application, for example to compensate for inaccuracies of exter-
nal voltage divider resistors.
E) LCD display test "LKT"
The contact "LKT" serves for short-term checks of the display segments. When it is contacted, all the seg-
ments are shown for a check.
The test connection "LKT" must not be linked for more than 2 seconds, or the module
would be damaged.
Circuit examples
Voltage measuring range
This device can be configured for different voltage ranges,
by soldering resistors to the positions RA and RB.
For this module, a 0-Ohm resistor is installed for RA, which
must be removed before RA and RB can be modified.
For the respective resistance values, please refer to the enclosed sheet with the various application circuits.
For an accuracy of 0.1 %, please use 0.1% resistors. If the required accuracy is less, you can deviate from
this rule.
Disposal
Electronic products are raw material and do not belong in the household waste. When the
device has reached the end of its service life, please dispose of it, according to the current
statutory requirements, at your local collecting site. Disposal in the domestic waste is not per-
mitted!
Technical data
Operating voltage
Power input
Measurement range
Display
Measuring impedance
Definition
Accuracy
Measuring frequency
Temperature stability
Operating temperature
Display light
Operating voltage
Display light
Power input
Dimensions
Impressum /legal notice in our operating instructions
These operating instructions are a publication by Voltcraft
All rights including translation reserved. Reproduction by any method, e.g. photocopy, microfilming, or the capture in electronic data processing
systems require the prior written approval by the editor. Reprinting, also in part, is prohibited.
These operating instructions represent the technical status at the time of printing. Changes in technology and equipment reserved.
© Copyright 2009 by Voltcraft
®
"battery".
DVM 220
DVM 320
9 V/DC
9 V/DC
2 mA
2 mA
0 - 200 mV/DC
0 - 200 mV/DC
LCD, 1999
LCD, 1999
100 MOhms
100 MOhms
0.1 mV
0.1 mV
0.05 % ± 1 digit
0.05 % ± 1 digit
3 measurements/sec
3 measurements/sec
30 ppm/°C
30 ppm/°C
0 to +50 °C
0 to +50 °C
9 V/DC
12 V/DC
9 V/DC
15 mA
18 mA
30 mA
See enclosed sheet, "dimensions"
®
, Lindenweg 15, D-92242 Hirschau/Germany, Phone +49 180/586 582 7 (www.voltcraft.de).
12 V/DC
35 mA
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