Delton 770E, Руководство оператора

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shows the approx. forward voltage of this diode.
7-8-4 On Audible continuity range, connect the test leads to two point of circuit, if the
resistance is lower than approx. 50Ω, the buzzer sounds.
NOTE: Make sure the power is cut off and all capacitors need to be discharged under this
measurement.
7-9 Transistor hFE Test
7-9-1 Set the rotary switch at the desired “ hFE ” range position.
7-9-2 Determine whether the transistor is NPN or PNP and locate the Emitter, Base and
Collector leads. Insert the leads into the proper holes in the socket on the front panel.
7-9-3 You can get reading of the approximate hFE value from LCD.
NOTE: Don’t connect an external voltage to measuring terminals.
7-10 Non Contact AC Voltage detection
7-10-1 Set the rotary switch at the desired “ NCV ” range position, the NCV green LED light will
light up.
7-10-2 Hold the Meter so that the mater’s top is vertically and horizontally centered and
contacting the conductor, when the live voltage ≥ 90V AC rms, the NCV red LED light
and green LED light will light up alternately together with sound.
NOTE:
1. Even without LED indication, the voltage may still exist. Do not rely on non-contact voltage
detector to determine the presence of voltage wire. Detection operation may be subject to
socket design, insulation thickness and different type and other factors.
2.
When the meter input terminals presence voltage, due to the influence of presence voltage,
voltage sensing indicator may also be bright.
3. Keep the meter away from electrical noise sources during the tests, i.e., florescent lights,
dimmable lights, motors, etc.. These sources can trigger Non-Contact AC Voltage detection
function and invalidate the test.
8. Battery replacement
8-1 When the battery voltage drop below proper operation range the " " symbol will appear
on the LCD display and the battery need to changed.
8-2 Before changing the battery, set the selector switch to “ OFF ” position and remove the test
leads from the terminals. Open the cover of the battery cabinet by a screwdriver.
8-3 Replace the old battery with the same type battery (9V 6F22).
8-4 Close the cover of the battery cabinet and fasten the screw.
9. Fuse replacement
9-1 This meter is provided with a 500mA/500V fast fuse to protect the temperature test and the
current measuring circuits which measure up to 400mA, with a 20A/500V fuse to protect the
20A range.
9-2 Ensure the meter is not connected to any external circuit, set the selector switch to “ OFF ”