GW Instek GOS-6200 User Manual

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GOS-6200 OSCILLOSCOPE

USER MANUAL

⎯ 38 ⎯

5-2.Connecting Input Signals

Grounding

The most reliable signal measurements are made when the oscilloscope

and the unit under test are connected by a common reference (ground lead)

in addition to the signal lead or probe. The ground lead of the probe

provides the best grounding method for signal interconnection and

ensures the maximum amount of signal-lead shielding in the probe cable.

A separate ground lead (with a banana plug) can also be connected from

the unit under test to the oscilloscope ground jack on the front panel.

Probes

A probe provides the most convenient way to connect an input signal to

the oscilloscope. The standard Ч1/Ч10 probes supplied to the oscilloscope

are shielded against electromagnetic interference and have a high input

impedance for low circuit loading.

CAUTION. To get the best waveform precisely, keep

probe ground and signal leads as short as possible.

Misadjust probe compensation can cause measurement error. Check and

adjust probe compensation whenever a probe is moved to a different

channel or oscilloscope. As for the probe compensation adjustment

procedure, refer to the “Probe Compensation”.

Coaxial Cables

Signal input cable can greatly affect the accuracy of a displayed

waveform. To maintain original frequency characteristics of the input

signal, use only high-quality, low-loss coaxial cables. Coaxial cables must

be terminated at both ends in their characteristic impedance to prevent

signal reflections within the cable. Use suitable impedance-matching

devices.

GOS-6200 OSCILLOSCOPE

USER MANUAL

⎯ 39 ⎯

5-3.Adjustments and checks

Trace Rotation Adjustment

Normally, when the trace is in parallel with the center horizontal graticule

line, there will be no need to adjust the TRACE ROTATION. If necessary,

adjust the TRACE ROTATION to make the baseline trace parallel to the

center horizontal graticule line by using a small straight-blade screwdriver

or alignment tool.

Probe Compensation

To minimize the distortion of measured waveforms, check the

compensation of your probes before using them. The probe compensation

should be checked periodically whenever the probes are moved to

different input channels.

1. Install the probes onto the oscilloscope (Press the BNC connector onto

the channel input and rotate the connector to lock it into place).

2. Set the probe slide switches to the ×10 position.

3. Briefly pressing the CH1/CH2 button to set the oscilloscope to channel

1 and channel 2.

4. Pressing and holding the P×10 button to set the indicated deflection

coefficient of the channel displayed in the readout as a symbol “P10”.

5. Attach the probe tips to the CAL connection in the front of the

oscilloscope.

6. Set the oscilloscope controls to display both channels:

VERTICAL:

VOLTS/DIV

COUPLING

ALT/CHOP/ADD

CHOP

HORIZONTAL:

MODE

MTB

TIME/DIV

0.5ms

TRIGGER:

MODE

ATO

SOURCE

CH1 or CH2

COUPLING

SLOPE