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Short Instruction for HM 203-7
Switching on and initial setting
Connect 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, selector switch to AC, TV SEP. switch to OFF.
AT/NORM. button released, CH.I input coupling switch to GD, set TIME/DIV. switch to 50ps/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 mode
Channel I: All buttons in the Y section in out position.
Channel II: CHI/II button depressed.
Channel I and II: DUAL button depressed. Alternate channel switching: CHOP. (ADD) button in out position.
Signals < 1 kHz or time coefficient > 1 ms/div: DUAL and CHOP, buttons depressed.
Channel l + ll (sum): depress only ADD button.
Channel I —II (difference): depress ADD and the INV. CHII button.
Triggering mode
Select trigger mode with AT/NORM, button:
AT =
Automatic Triggering ^0h\z
to >:40MHz (out position). NORM. =
Normal Triggering
(depressed).
Trigger edge direction: select slope with +/— button.
Internal triggering: select channel with TRIG. I/II(CH. I/ll) button.
External triggering: EXT. button depressed; sync signal (0.3Vpp to 5Vpp) to TRIG. INP. socket.
Line triggering: TRIG, selector switch to ~.
Select trigger coupling with TRIG, selector switch. Trigger frequency ranges:
AC: 10Hzto10MHz(-3dB);DC: DCto10MHz(-3dB); HF: 1.5kHzto40MHz(-3dB); LF: DCto50kHz(-3dB).
Composite video signal with line or horizontal frequency: TV SEP. switch to TV: H.
Composite video signal with frame or vertical frequency: TV SEP. switch to TV; V.
Select edge direction with +/- button (sync, pulse above ^ +, below ^ -.
Pay attention to trigger indicator: LED near to TRIG, selector switch.
Measurements
Apply test signal to the vertical input connectors of CH. I and/or CH. II.
Before use, calibrate attenuator probe with built-in square wave generator CAL.
Switch input coupling to AC or DC.
Adjust signal to desired display height with attenuator switch.
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 left stop (CAL.).
Time measurement with time fine control at left stop (CAL.).
Horizontal expansion x10 with X-MAG. xIO button depressed.
External horizontal sweep
{X-Ymode)
with X-Y button depressed (X input: CH. II).
Component Tester
Press COMPONENT TESTER button. Connect both component terminals to
CT
and ground 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 HM203-7 (cable, probe), then start testing.
Subject to change without notice
K1 203-7
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