When both test electrodes are placed on a voltage
within the rated voltage range, LEDs light up and a
V-symbol is shown on the LCD indicator.
With
alternating voltage
both
LEDs (±)
(the ones on the left
and
on the right) light up.
With
direct voltage
the left
or
the right LED (±)
lights up.
Polarity
is determined as follows:
The LED marked „+“ lights up when the test probe
marked „+“ is connected to the positive pole.
When
both
push-buttons are pressed, the measu-
ring system indicates the r.m.s. value and the circuit
is under low resistive load.
13
The nominal voltage ranges that are stated on the
type plate refer to the three display systems,
LCD, LED and measuring system.
Note
Even when the push-buttons are not actuated,
voltage is clearly indicated by the LEDs and the LCD.
Voltage of 24 V or more
(LED in the middle)
Voltage/Polarity of 50 V or more
(left one and right one LEDs ±)
Ω
V
Phase and phase sequence
(LED and LCD)
Voltage from 24 V (LCD)
Continuity/Self-test
(LCD)
Value of voltage
from 100/120 V
(measuring system)
Push-button for measuring
system and additional load
(both push-buttons have to
be pressed)
Indication of ...
Connected load 350 W
4.3 Testing voltage and polarity
Attention!
The maximum allowable on-time is 30 s.
Note!
The internal resistance of the Prüfball SPB is very
high when the switching probes are not pressed. In
extreme cases, indication of inductive or capacitive
voltages may occur which disappears when both
push-buttons are pressed.
The indicator of the measuring system can vary from
the zero point due to electrostatic charging
(e.g. with very low humidity). This does not affect the
LED or LCD display.
