4
DO340-1
TA466 Two-pole Voltage Detector
Copyright © 2020 Pico Technology Ltd. All rights reserved.
User’s Guide
3. Operating instructions
3.1. Safety instructions
Please refer to the complete safety information for this product, in the
PicoScope
®
4225A and
4425A Automotive oscilloscope and accessories Safety Guide
, before you use it.
3.2. Correct operation check (self-test)
Always perform a correct operation check before and after the no-voltage check.
1.
Inspect the device test leads and probes for damage.
2. Short circuit the test-lead points and press the test button. The correct operation of the device
is indicated by:
•
All the numbers and symbols on the display are illuminated in red.
• A rapidly pulsating audible signal.
Never use the device if this check is not successful. In particular, make sure that the buzzer signal
is audible in noisy areas.
Note 1: A correct operation check (self-test) indicates, among other things, whether the battery
level is correct. If the correct operation check fails, replace the battery and do the check again. If it
still fails you must return the unit to the manufacturer. Please contact your local Pico representative
to arrange the return.
Note 2: The “correct operation check” function is there to make sure that the test leads, battery, and
electronic circuit integrity are working and correct.
3.3. Battery level indicator
The
symbol gives information on the battery level.
3.4. AC or DC voltage verification and measurement
Place the test probes in contact with the source you want to check. If the voltage is only a few volts
(< 3 V) no signal will sound and the display will remain dark. The presence of voltage > 3 V will be
displayed according to the voltage characteristics. The screen will become blue for voltages of ≤
36 V AC RMS and ≤ 36 V DC. A voltage level > 36 V is indicated by the illumination of the harmful
voltage presence LED, red backlighting on the screen and the emission of an intermittent audible
signal.
This device will always indicate the presence of harmful voltage (> 36 V) with the indicator light,
even if the batteries are out of service.
•
The presence of an alternating voltage is confirmed by the illumination of the
symbol.
•
The presence of a direct voltage is confirmed by the illumination of the
symbol.
•
The display will automatically stop as soon as the measuring probes are disconnected.
•
The display has a resolution of 1 V.
• The unit has an accuracy of (± 5% ± 2 digits).
Note: Do not use the verification indicators alone for voltage measurements.
