alarm sound will stop automatically after 60 seconds, or can be deactivated by
pressing any key.
3) The alarm hysteresis error δ is a fixed value for each tyPE, which cannot be
changed by users. Δ≈(0.1~0.6)Δ (electric quantity). The alarm hysteresis error
can avoid oscillation alarm near the alarm points.
Calibration
When the instrument exceeds the tolerance according to measurement verification
or after repairing, user can perform calibration, and the factory calibration
coefficient can be resumed if there are errors in the user calibration. User
calibration includes instrument coefficient calibration and temperature error
calibration for the interior reference ends. Before calibration, old batteries should
be replaced with new ones, signal wires should be connected well, the instrument
should be placed in the environment with stable temperature and humidity, before
calibration you should wait for 30 minutes after start-up, and no obvious external
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