Amprobe VPC-30 VPC-31 Voltage-Continuity - Manual (Page 12)

6
Bi-Color LED Hazardous Live Warning
The voltage LEDs are red if the measured voltage is above 70 VDC/33 VAC.
These levels are deemed to be hazardous live in normal condition. Below these
levels, the LEDs are green.
Auto-Hold
The LEDs flash the last significant measured value for approx. 10 seconds after
a voltage measurement is made and removed via the test probes. The VPC-31
LCD also flashes the last significant measured value. Both test probes should
be removed from the test points at about the same time (< 0.5 second in time
difference) or else lower (intermittent) voltage might be measured.
AC-Detection Shaker
The shaker signals that significant ACV is being measured via the test probes.
With no input, press and hold the GFCI button and then followed by the
EF button to toggle the shaker ON/OFF. The shaker will remain on until the
buttons are released to confirm that the AC-Detection Shaker feature is
enabled. The shaker will turn on briefly to signal that this feature has been
disabled.
Electric Field EF-Detection Refer to Fig.3
Press and hold the EF button to enter and stay at EF-Detection feature. The
EF-indicating LED will turn on briefly, and the beeper will give a short beep for
EF indication check. Signal strength is indicated by beep tone and flashing of
the EF LED. The VPC-31 also displays “EF” when it is ready, and displays signal
strength as a series of bar-graph segments on the LCD.
• Non-Contact EF-Detection: An antenna is located along the top-right
side of the meter, which detects electric field surrounds current-carrying
conductors. It is ideal for tracing live wiring connections, locating wiring
breakage and to distinguish between live or earth connections.
• Probe-Contact EF-Detection: For more precise indication of live wires,
such as distinguishing between live and ground connections, use the Red
(+) test probe for direct contact measurements.