Systems for measurement and control

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VisualPhase LCD

Chapter: Overview · Description · Options · Technical data · Item numbers

The original. Simply brilliant.

The VisualPhase LCD is a very easy-to-use two-phase voltage detector (VDS), maintenance tester and phase comparator (UPC). Its automatic, thorough self-test ensures reliable function. The permanently enabled interface-testers warn against defect interfaces, whereas a liquid crystal display shows the measured current [I/µA] or frequency [f/Hz]. Thanks to the integrated configuration menu it can be adjusted to switchgears operated below nominal voltage on-site.

Part: VDL-01 Display scheme VDS

The integrated “Universal Phase Comparator” can compare two different interface signals, even if they are of different types or voltages. A unique error control avoids switching errors caused by erratic or unfeasible phase comparison. The digital display of phase angle helps to sync different net segments or to put the phase sequence in desired order.

Application and technique

The VisualPhase LCDis a dual phase VDS (Voltage Detecting System) with integrated UPC (Universal Phase Comparator) for the LR-System in compliance with IEC/EN 61243-5 (DIN VDE 0682 Part 415). Additionally the device connects to HR, MR and LRM string parts with appropriate adapters.

The evaluated indication of the interface current is executed by means of two bright LEDs per phase, which display the conditions voltage absent, residual voltage, voltage present, string part Ok and high current respectively. Additionally you can read the digital ammeter to get the live interface current in [I/µA] for each phase:

Condition Current (Uo = Un) Display
Voltage absent < 0.30 µA Green continuous light
Residual voltage 0.30 - 2.49 µA Green flashing light
Voltage present 2.50 - 3.19 µA Red flashing light
String part ok >= 3.20 µA Red continuous light
High current > 15.0 µA Red flashing light (90% duty cycle)

The determination is accomplished with an rms-value measuring method independent of the applied waveform. If operating / nominal voltage differ (the ratio is set), the threshold values will be readjusted accordingly, thus stepper motors, switching power supplies or switchgears with lowered operating voltage pose no threat.

The build-in ampere and frequency meter assists in compliant maintenance-testing of switchgears, as stated in section 5.26 of IEC/EN 61243-5, by providing explicit information via the dot matrix display:

Display Description
Interface current L1: 17.34 µA and
Interface current high (equivalent to > 120% Un)
Interface current Lx: 6.85 µA and
String part ok
Interface current L1: 2.50 µA and
String part defect
Frequency L1: 50.0 Hz and
undisturbed, good signal
Frequency L1: 120.3 Hz and
frequency too high with signal interference

Alternatively the multi-functional display can show phase difference φ, rotational field and its analysis. Fast zero-crossing detectors with digital offset compensation carry out phase comparison:

Display Description
Phase angle -120.3°,
counterclockwise rotation field and phase unbalance
Phase angle +119.8°,
clockwise rotational field and phase unbalance
Phase angle +0.1°
and phase balance

The integrated self-test ensures secure operation. It starts automatically whenever the device is switched on. You merely plug the connection leads into the test jacks of the device, push the power button once and the device checks the connection leads, the LEDs, the battery and the correct functioning of electronic measuring circuits and software. If an error is detected you will be notified of fault condition before it shuts down.


User-replaceable batteries

The device can be equipped with commercially available Lithium batteries (2x CR123A), to keep the downtime caused by battery exchange small.

Firmware modification

On request we can preset your custom operating / nominal voltage ratios for easy handling or personalize the menu navigation - as far as possible - according to your wishes.

Technical data

VisualPhase LCD (VPL-01)
Connecting system LR
Impedance 2 MΩ at f=50 Hz
Threshold values
(Uo = Un)
0.30 µA - residual voltage
2.50 µA - voltage present
3.20 µA - string part ok
15.0 µA  - high current
Phase angle ±  0 - ±  20.0° - Phase balance
±21.0 - ±180.0° - Phase unbalance
Frequency range < 15 ... > 450 Hz (VDS)
45 - 65 Hz (UPC)
Input voltage 0 - 65 V~
Connecting system 2x Phone plug Ø 6.35 mm,
1.5 m connection lead
Electronics 8 Bit MCU; 2 MHz clock; 10 Bit A/D
Display 2x LED green, 2x LED red,
2x8 Char LC-Display (BL green/yellow)
Measurement range Current: 0,0 - 22,50 µA
Frequency: 10.0 - 450.0 Hz
Phase: -180.0 - +180.0°
Power supply 2 lithium cells, 6V
Dimensions 150 x 80 x 35 mm
Weight approx. 450 g
Protection class IP 54

Subject to change without prior notice!


Order-No. Name
VPL-01 VisualPhase LCD
VPL-01/K ... with two HR-LR adapters in plastic case
VPL-01/L ... with two HR-LR adapters in leather wallet
MA-HL02 Test adapter HR to LR-system
MA-ML01 Test adapter MR to LR-system
MA-LML01F Test adapter LRM to LR-system (14 mm fixed)
MA-LML01S Test adapter kit LRM to LR-system (flex)
MA-LPL02S Test adapter kit LRP to LR-system (4 mm)
MA-LPL02S/6 Test adapter kit LRP to LR-system (6 mm)
MA-LPL01S/CC Test adapter kit LRP to LR-system for CapaConnect
AB-KK01 Plastic case for VisualPhase LCD
AB-LT01 Leather wallet for VisualPhase LCD