5
DO340-1
TA466 Two-pole Voltage Detector
Copyright © 2020 Pico Technology Ltd. All rights reserved.
User’s Guide
3.5. Polarity check (direct voltage)
•
If the red test probe is connected to the positive terminal of the source, the symbol is
displayed.
•
If the red test probe is connected to the negative terminal of the source, the symbol is
displayed.
3.6. Phase/neutral check (alternating voltages)
It is easy to spot neutral phases with the TA466. You perform this operation with the red test probe
while holding the device. The black probe is not required and can be left clipped in place on the
back the voltage detector
If the red test probe comes in contact with a phase, the
Phase
symbol comes on (the display will
turn blue). This provides an indication of contact with a phase only and is not an indication of safe
working voltage at the contact point of the probe.
3.7. Phase order check (three-phase system on AC mains)
You can use the TA466 to determine the phase order in a three-phase system. You perform this
operation in two sequences, using the two test probes. First, make sure that there is voltage
present and that it has the same value for each of the three phases (at least 127 V).
Keep the red test probe in contact with phase 1 during the entire operation (Step 1 and Step 2).
Step 1:
• Place the black test probe in contact with phase 2.
• The device is ready for the next sequence when the
symbol blinks.
Step 2:
•
Move the black test probe to phase 3:
•
If the symbol rotation is clockwise, the phase order is as well (L1, L2, L3).
•
If the symbol rotation is counter-clockwise, the phase order is as well (L3, L2, L1).
•
If the symbol disappears or keeps blinking, the three-phase system is not balanced.
Repeat the two steps to confirm the result.
Note 1: You only have 10 seconds to carry out Step 2.
Note 2: In the case of counter-clockwise order, we advise you to check the phase shift again by
reversing the order of connections 2 and 3 to confirm the phase sequence.
Note 3: To start a new check (from Step 1 again), disconnect the device from the source you are
checking and wait until the
symbol stops blinking.
