B&K Precision 310 - Manual - Manual (Page 5)

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The meter has a built-in custom 3½ digit liquid crystal display can be
viewed in most lightning conditions. This display indicates the
diferentes conditions (Hold, m, buzzer, polarity condition of load, +
or -, automatic decimal point change).
The ranges are selected by a 5 position rotary switch, and a test is
initiated by pressing the ON push-button.
The instrument takes measurements for 10 seconds if the "ON"
"TEST r " presentative" button is depressed for less than 2 seconds.
e
If the same push button is pressed for more than 3 seconds, the test
will carry on for 60 seconds.
The tester switch "OFF" completely when the rotary switch is in the
"OFF" position.
The tester "Hold" the last reading before stopping the test.
The tester is fuse protected and has a crowbar between C and C .
1 2
This crowbar is activated by voltage. If the voltage is too high, that
crowbar will blow the fuse automatically to interrupt the circuit.
The voltage between P and P is also protected for over voltage but
1 2
does not have a fuse.
The tester has a temperature shut down. The temperature sensing
is done on the current regulation transistor.
Should this over-temperature let lit, allow the instrument to cool
down for a while before proceeding further.