PeakTech LDP-135 340 Series Voltmeter User Manual
- June 3, 2024
- PeakTech
Table of Contents
Unser Wert ist messbar…
LDP-135 340 Series Voltmeter
User Manual
LDP-135 340 Series Voltmeter
PeakTech®LDP-135 – 340 Series
Operation Manual
Module
Safety regulations
This product complies with the requirements of the following directives of
the European Union for CEconformity: 2014/30/EU (electromagnetic
compatibility) and 2011/65/EU (RoHS).
Before connecting the modules, read and take note of the following safety
regulations and instruction manual.
Damages resulting from failure to observe these safety precautions are exempt
from any legal claims whatever.
- During the measurement of voltages over 30 Vrms (= 42 Vpp)or 60 V DC with respective wiring of the module take care that the circuit, in which you use the module follows the relevant safety regulations of the EN61010-1.
- Do not use these modules in installation with overvoltage category III according IEC 664. The modules are not protected against arcing.
- Use caution when working above 25 V AC or 35 V DC.
Even such voltage poses a shock hazard. - Before you change the measuring range (another wiring of Ra and Rb) remove the probe tips from the circuit.
- Measuring instruments don’t belong to children hands
General
These LCD-/LED-voltmeter modules are 3 ½ digit modules for application in
Voltmeter and Amperemeter. ”
They are suitable for measuring DC voltage up to max. 500 V, depending of the
wiring of Ra and Rb. You can also measure DC current of 0.2 mA up to max. 2 A,
depending
of the rating of the used shunts at a max. voltage of the measuring circuit of
35 V DC.
Another application of the modules instead of the described is not allowed.
The models LDP-340 and LDP-140 are additionally provided with a backlight.
Technical Data
max. input voltage (basic instrument,
| Ra = open; | 199,9 mV DC |
|---|---|
| Rb = shorted): | 1999 (3 ½-digit) with automatic |
| max. display: | polarity indication |
| Display: | LCD i. e. LED elements |
| Measuring principle: | dual slope A/D converter |
| Cipher height: | LDP-135/140: 13 mm |
LDP-335/340: 8 mm
LDP-235/240: 14 mm
Overflow indication:| “1” is displayed
Sampling rate:| 2…3 times per second
Input impedance:| > 100 MΩ
Accuracy:| ± 0,5 % (at 23° C ± 5° C and a relative humidity of < 80 %)
Power dissipation:| 1 mA DC (LDP-135/335)
30 mA DC (LDP-340)
70 mA DC (LDP-140)
ca. 60…170 mA DC (LDP-235/240)
Decimal point:| selectable with jumper
Mounting holes| LDP-135/140: 54,5 mm (W) x 38,8 (H) mm
LDP-335/340: 43,5 mm (W) x 19,5 (H) mm
LDP-235/240: 69,5 mm (W) x 46,5 (H) mm
Supply voltage:| 9 V DC (LCD) 9…12 V DC (LED)
Dimensions:|
LDP-135/140:| 68,5 x 40,5 x 18 mm
LDP-335/340:| 47 x 20 x 16 mm
LDP-235/240:| 83 x 49,5 x 22 mm
Operation
Before operating take care that the module is enough isolated and the air
section and leakage path according VDE 0411 i. e. VDE 0410 and EN 61010-1 is
guaranteed.
Important! Please use only soldering irons with max 20 W!
Connect a voltage of
– 9 V DC (LDP-135 / 140 / 335 / 340 LCD)
– 9 … 12 V DC (LDP-235 / 240 LED) to the supply input (9 V battery).
Please consider the polarity.
Caution!
A simultaneously supply of the module and measuring of the supply voltage is
not possible.
Operation of several modules with same power supply is not possible (one
module = one power supply, i. e. 9 V battery).
4.1. Changing the voltage divider
a) The voltage in the following chart can be added and the jumper plug
accordingly displayed if required (resistors are optional components).
LDP-135 / 140 LCD:
| Max. measuring voltage | Required voltage divider | Decimal point |
|---|---|---|
| 200 mV | Ra: open (factory setting) | |
| RB: ……………0Ω | Shod P3 | |
| 2 V | Ra: 1………. MΩ | |
| Rb: 9……… MΩ | Short P1 | |
| 20 V | Ra: 100……. kΩ | |
| Rb: 9,9…… MΩ | Short P2 | |
| 200 V | Ra: 10……. kΩ | |
| Rb: 9,99…. MΩ | Shod P3 | |
| 500 V | Ra: 1…….. kf/ | |
| Rb: 9,999 ….MΩ |
LDP 235 / 240 LED:
| Max voltage | Required voltage divider | Decimal point |
|---|---|---|
| 200 mV | Ra: 0…………. Ω (factory setting) | |
| Rb: open | Short P3 | |
| 2 V | Ra: 9…………… MΩ | |
| Rb: 1……………… MΩ | Short P1 | |
| 20 V | Ra: 9,9 ……………MΩ | |
| Rb: 100 ……………kΩ | Short P2 | |
| 200 V | Ra: 9,99………… MΩ | |
| Rb: 10………………. kΩ | Short P3 | |
| 500 V | Ra: 9,999 …………MΩ | |
| Rb: 1……………………. kΩ |
LDP 335 / 340 LCD:
| Max voltage | Required voltage divider | Decimal point |
|---|---|---|
| 200 mV | Ra: 0…………. Ω (factory setting) | |
| Rb: open | Short P3 | |
| 2 V | Ra: 9…………… MΩ | |
| Rb: 1……………… MΩ | Short P1 | |
| 20 V | Ra: 9,9 ……………MΩ | |
| Rb: 100 ……………kΩ | Short P2 | |
| 200 V | Ra: 9,99………… MΩ | |
| Rb: 10………………. kΩ | Short P3 | |
| 500 V | Ra: 9,999 …………MΩ | |
| Rb: 1……………………. kΩ |
Resistors Ra and Rb are ½ Watt; 0,5 % metal-foil resistors.
b) Connect module to an external DC voltage source.
c) The accuracy on all ranges expect 200 mV range should be adjusted with a
calibrated voltage of 50% of the selected range (i. e. 100 V for 200 V range).
Adjust potentiometer for equal reading of scale.
d) Connect the voltage to be measured to terminals VIN and GND (4). Connect DC
voltages to the input terminals only.
4.2. Measuring DC current
To measure DC current, wiring measuring input (4) as per following table:
| Range | Decimal-point | Shunt |
|---|
200 µA
2 mA
20 mA
200 mA
2000 mA| Short P3
Short P1
Short P2
Short P3| 1……………. kΩ
100…………. Ω
10 …………Ω
1 …………….Ω
0,1 ………….Ω
Caution! The max. voltage should not exceed 35 V DC in the circuit. The
measuring input for current/voltage is notprotected.
4.3. Recommended circuit configurations
Connecting diagram
LDP-135 / LDP-140 Back-view:
LDP-235 / LDP-240 Back-view: LDP-335 / LDP-340 LCD Back-view: All
rights, also for translation, reprinting and copy of this manual or parts are
reserved. Reproductions of all kinds (photocopy, micro-film or other) only by
written ermission
of the publisher.
This manual is according the latest technical knowing.
Technical changing which are in the interest of progress reserved.
We herewith confirm that the units are calibrated by the factory according to
the specifications as per the technical specifications. We recommend to
calibrate the unit again, after 1 year.
©PeakTech® 08-2021 Ho/Th/Pt/JTh/Ehr
PeakTech Prüf- und Messtechnik GmbH
– Gerstenstieg 4 – DE-22926 Ahrensburg / Germany
+49-(0) 4102-97398-80
+49-(0) 4102-97398-99
info@peaktech.de
www.peaktech.de
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>