SAFETY INFORMATION This multimeter has been designed according to IEC 1010 concerning electronic measuring instruments with an overvoltage category (CAT II) and pollution . Follow all safety and operating instructions to ensure that the meter is used safely and is kept in good operating condition.
DURING USE • Never exceed the protection limit values indicated in specifica- tions for each range of measurement. • When the meter is linked to measurement circuit, do not touch unused terminals. • Never use the meter to measure voltages that might exceed 600V above earth ground in category II installations.
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Function 903-150NAS 903-150NBS 303-150NCS 903-150NDS AC Voltage V~ • • • • DC Voltage V • • • • DC Current A • • • • Resistance Ω • • • • Diode • • • • Transistor hFE test •...
FRONT PANEL DESCRIPTION Display 3 1/2 digit, 7 segment, 15mm high LCD. Back light (option) When this button is pushed, the Back light of display is on. After about 5 seconds, the Back light is self-off. The Back light is on again, just push this button once.
Overload Protection: 600V dc or rms. ac for all ranges. Frequency range: 40Hz to 400Hz. Response: Average respond- ing, calibrated in rms. of a sine wave. DIODE & CONTINUITY (*903-150NAS Excepted) Range Description If continuity exists (about less than 1.5kΩ), built-in buzzer will sound.
DC CURRENT MEASUREMENT 1. Connect the red test lead to the "V.Ω.mA" jack and the black test lead to "COM" jack. (For measurements between 00mA and 10A, remove red lead to "10A" jack.) 2. Set the rotary switch at desired DCA position. .
TRANSISTOR TEST 1. Set the rotary switch at "hFE" position. . Determine whether the transistor under testing is NPN or PNP and locate the emitter base and collector leads. Insert the leads into proper holes of the hFE socket on the front panel. .
BATTERY & FUSE REPLACEMENT If " " appears on display, it indicates that the battery should be replaced. Fuse rarely need replacement and blow almost always as a result of operator’s error. To replace battery & fuse (200mA/250V) remove the 2 screws in the bottom of the case.
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