Hameg HM303-6 Manual

Also see for HM303-6: Operator's manual Service manual

Contents

22 Subject to change without noticeShort Instruction for HM303-6Switching on and initial settingConnect instrument to power outlet, depress red POWER button. LED indicates operating condition.Case, chassis and all measuring terminals are connected to the safety earth conductor (Safety Class I).Do not depress any further button. TRIG. MODE selector switch to AC.AT/NM button released, CH I input coupling switch to GD, set TIME/DIV. switch to 50μs/div.Adjust INTENS control for average brightness.Center trace on screen using X-POS. and Y-POS.I controls. Then focus trace using FOCUS control.Vertical amplifier modeChannel I: CH I/II, DUAL and ADD pushbuttons in out position.Channel II: CH I/II pushbutton depressed.Channel I and II: DUAL pushbutton depressed. Alternate channel switching: ADD (CHOP.) pushbutton in out position.Signals <1kHz or time coefficient ³1ms/div: DUAL and ADD (CHOP.) buttons depressed.Channel I+II (sum): depress only ADD button.Channel I-II (difference): depress ADD and INV. pushbuttons.Triggering modeSelect trigger mode with AT/NM pushbutton:AT = Automatic Peak (value) Triggering <20Hz to 60MHz (out position). NM = Normal Triggering (depressed).Trigger edge direction: select slope with SLOPE ( ) pushbutton.Internal triggering: select channel with TRIG. I/II (CH I/II) pushbutton.Alternating triggering (internal): DUAL and ALT. pushbuttons depressed, ADD (CHOP.) pushbutton in the out position.External triggering: TRIG. EXT. pushbutton depressed; sync signal (0.3Vpp to 3V pp) to TRIG. EXT. socket.Line triggering (normal triggering): AT/NM and ALT pushbuttons depressed (~).Select trigger coupling with TRIG. MODE selector switch. Trigger frequency ranges:AC: >20Hz to 100MHz; DC: DC to 100MHz; LF: DC to 1.5kHz.TV: Composite video signal with line or horizontal frequency.TIME/DIV. 0.2s/div. - 1ms/div. = field frequencyTIME/DIV. 0.5ms/div. - 0.1μs/div. = line frequencySelect edge direction with SLOPE ( ) pushbutton (sync. pulse above /, below \).Pay attention to trigger indicator: TR LED above the SLOPE pushbutton.MeasurementsApply test signal to the vertical input connectors of CH I and/or CH II.Before use, calibrate attenuator probe with square wave CALIBRATOR-signal.Switch input coupling to AC or DC.Adjust signal to desired display height with attenuator switch (VOLTS/DIV.).Select time coefficient on the TIME/DIV. switch.Set trigger point with LEVEL knob for normal triggering.Trigger complex or aperiodic signals with longer HOLD OFF-time.Amplitude measurement with Y fine control at right stop (CAL.).Time measurement with time fine control at right stop (CAL.).Horizontal expansion 10 fold with X-MAG. x10 button depressed.External horizontal deflection (X-Y mode) with XY pushbutton depressed (X input: CH I).Component TesterPress COMP. TESTER pushbutton (on). Connect both component terminals to COMP. TESTER jacks.In-circuit test: Circuit under test must be disconnected from battery or power (pull out power plug), signals and ground (earth).Remove all signal connections to HM303-6 (cable, probe), release X-MAG. X10 pushbutton, then start testing.

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