5–4
CHANNELS, Coupling & Probes
Probes and Probe Calibration
Probe Calibration To calibrate the probe supplied, connect it to one of the input
channels’ BNC connectors. Connect the probe’s grounding
alligator clip to the CAL BNC ground and touch the tip to the
inner conductor of the CAL BNC. The CAL signal is a 1 kHz
square wave, 1 V p-p.
Set the channel coupling to DC 1 MΩ, turn the trace ON and
push AUTO SETUP to set up the oscilloscope. If over- or
undershoot of the displayed signal occurs, the probe can be
adjusted by inserting the small screwdriver, supplied with the
probe package, into the trimmer on the probe’s barrel and
turning it clockwise or counter-clockwise to achieve the optimal
square-wave contour.
More On Coupling
In the AC position, signals are coupled capacitively, thus
blocking the input signal’s DC component and limiting the
signal frequencies below 10 Hz.
In the DC position, all signal frequency components are
allowed to pass through, and 1
the input impedance.
The maximum dissipation into 50
Ω
matically be grounded whenever this is attained. An
overload message will be displayed in the Acquisition
Summary Field and “Grounded” will be indicated in the
“Coupling” menu. The overload condition is reset by removing
the signal from the input and again selecting the 50
impedance from the menu.