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FAQ
The oscilloscope does not power up
Check that the battery is charged. If the battery is not charged, plug the AC Adaptor charger
into an AC source and then into the meter. Charge the battery for at least 15 minutes before
using the Oscilloscope. Please contact Extech for service if the instrument fails to power on
after a charge
The oscilloscope shuts down after operating for only several seconds
The battery is most likely very weak or completely drained; Check the displayed battery status
symbol. The
symbol indicates that the battery is exhausted and must be charged.
The meter displays ERR when in the Multimeter mode
The measurement mode is likely not selected. In this case, press any of the three mode keys
V, A or R
The measured voltage value is 10 times larger or smaller than the actual
value indicated in the oscilloscope mode
Check that the channel attenuation level matches the actual probe attenuation ratio
A waveform is displayed on the oscilloscope screen but is not stable
Check whether the signal item in the trigger mode menu matches the actual signal channel.
Check the trigger mode: The edge trigger mode is typically used for most applications; the
video trigger mode is applicable for video signals. Only when the proper trigger mode is
applied can the waveform be stable.
Change the trigger coupling into the HF rejection and LF rejection to filter the HF or LF noise
trigger by the interference.
No display when the RUN/STOP key is pressed in oscilloscope mode
Check whether the trigger mode in the trigger mode menu is in Normal or Single Shot and
whether the trigger level is outside of the waveform's range.
In such conditions, adjust the trigger level to be in the middle of the range or select the non-
auto trigger mode. Additionally, press the AUTO SET key and re-try the previous suggestions.
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V5.1 ‐ March 2010
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