VOLTCRAFT PM 129 Mode D'emploi page 2

O P E R A T I N G I N S T R U C T I O N S
Digital Panel Meter PM 129
Item-No. 10 69 42
Intended use
The digital panel meter is intended for installation in other devices or casings. The panel meter
measures and displays direct currents in the range 0 to 200 mV (DC). Higher voltages, as well
as direct currents etc, can be measured by using single external circuits. The polarity is auto-
matically displayed. The LED display contains 2000 counts (signals).
The module must not be operated openly at voltages greater than 75 VDC (by
an optional voltage divider). For voltages above 75 V, the appropriate instruc-
tions concerning the clearances to air and leakage paths for shock protection
must be followed. Always observe and adhere to the safe distance to dan-
gerous contact voltages/wires.
The panel meter is powered by 9V/DC (battery etc.).
The device is connected via two soldering points on the rear. The decimal points can also be
set via soldering bridges.
The panel meter is intended to be installed in a casing or in other devices. 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 the correct operation.
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!
We do not assume any liability for material and personal damage caused by improper use or
non-compliance with the safety instructions! The warranty will be void in such cases.
This panel meter is not a toy and should be kept out of the reach of children.
The panel meter has been CE tested and complies with the necessary European directives.
Please handle soldering irons with special care. Please follow these operating instructions.
Only heat the soldering point for as long as necessary and as short as possible.
Never touch circuits or parts of circuits with voltages greater than 25 V ACrms or 35 V DC!
Danger to life!
Installation
Prepare the Installation Section. The cover frame is designed for a 67 x 29 mm (W x H) section.
The module can be attached to the front using the supplied frame (max. panel thickness 7 mm).
Mounting material is included in the delivery.
Connection
All the connections and soldering bridges for the functions
are made on the back of the module.
The battery clip is already in place; only a 9V battery has to
be inserted, observe the correct polarity.
For the respective functions, please refer to the following
table:
+ VIN Measurement input + (0 - 200 mV DC)
- VIN Measurement input – (reference potential)
BAT Operating voltage 9VDC
P1 Soldering bridge for decimal point 1.999
P2 Soldering bridge for decimal point 19.99
P3 Soldering bridge for decimal point 199.9
RA1 Resistor for voltage divider at measuring input
RB1 Resistor for voltage divider at measuring input
R2 Reference adjustment potentiometer (factory function)
J3 Only factory function, not user-relevant
Measurement input "+ VIN" and "-VIN"
"+ VIN" and "-VIN" are differential inputs. They react to the voltage applied and not to the volt-
age relative to the operating voltage. Only a direct voltage may be applied as the measurement
voltage.
VOLTCRAFT
VOLTCRAFT
°
Version 02/09
The voltage at the measurement input must not exceed ±200 mV in the delivery condition, oth-
erwise the panel meter may be destroyed (display "I" = out of measurement range).
If voltages greater than ±200 mV are to be measured, an adequate voltage divider must to be
connected first.
®
®
Power Supply "BAT"
Power supply is 9 V/DC and must be galvanically isolated from the measurement input. If the
battery powered display is not readable, it is necessary to change the battery, in order to avoid
false measurements.
Circuit Examples
Choosing the voltage measurement range
This device can be configured for different voltage ranges, by soldering resistors in the posi-
tions RA1 and RB1.
For the basic measuring range from 0 - 200 mV/DC a 0Ωresistor (bridge) is already built in at
RA. RB is not used and remains free.
If another measurement range is chosen, disconnect the jumper RA and solder suitable resis-
tors to the free soldering points RA1 and RB1. The relevant values can be found in the table.
The voltage divider has an impedance of 1MΩ.
Measurement RA1 RB1
range
0 Ω
0 - 200 mV free
0 - 2 V 900 kΩ 100 kΩ 10:1
0 - 20 V 990 kΩ 10 kΩ
0 - 200 V 999 kΩ 1 kΩ
0 - 2000 V 999.9 kΩ 100 kΩ 10000:1
Suitable measuring resistors (0.1%) and/or precision voltage dividers can be
found on the Internet at www.conrad.biz
If you want to make the measurement ranges selectable, an external connection to the divider
is necessary. The jumper RA must not be disconnected. The following sketches show the con-
version (impedance 1 MΩ):
Principle Circuit
Choosing the current measurement range
The potential drop across this resistor can be measured with an ordinary shunt. Thus, the cur-
rent can be measured indirectly.
If only a single measurement range is chosen, you will only need one shunt. The appropriate
values can be found in the following table. The internal jumper RA must not be disconnected.
If you want to make the measurement ranges switchable, an external connection (decade) to a
divider is necessary. The resistors required can be seen from the sketch
Principle Circuit
Measurement 0 - 200 µA
range
R1 1 kΩ
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. Disposing of flat batteries
in the household waste is prohibited.
Technical Data
Power supply
Basic measurement range
Accuracy
Dimensions (W x H x D)
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 ®
Divider Form the connection
as desired and solder
them to the circuit
1:1
board as shown.
100:1
1000:1
Connection diagram voltage decade
Connection diagram current decade
0 - 2 mA 0 - 20 mA 0 – 200 mA
100 Ω 10 Ω 1 Ω
9 V/DC, 50 mA
0 – 200 mV/DC (30 MΩ impedance, measuring rate 3/s)
±(0.5 % + 1 digit)
68 x 44 x 21 mm
® , Lindenweg 15, D-92242 Hirschau/Germany, Phone +49 180/586 582 7 (www.voltcraft.de).
0 – 2 A
0.1 Ω