3 Connecting to the Device Under Test
76 InfiniiVision Oscilloscopes User’s Guide
Maximum input voltage at analog inputs:
CAT I 300 Vrms, 400 Vpk; transient overvoltage 1.6 kVpk
CAT II 100 Vrms, 400 Vpk
50 input: 5 Vrms
Input protection is enabled in 50 mode and the 50 load will disconnect if greater
than 5 Vrms is detected. However the inputs could still be damaged, depending on
the time constant of the signal. The 50 input protection only functions when the
oscilloscope is powered on.
1 M ohm input, 100 MHz models:
For steady-state sinusoidal waveforms derate at 20 dB/decade above 200 kHz to a
minimum of 10 Vpk
1 M ohm input, 350 MHz, 500 MHz, 1 GHz models:
For steady-state sinusoidal waveforms derate at 20 dB/decade above 57 kHz to a
minimum of 5 Vpk
With N2863A 10:1 probe: CAT I 600 V, CAT II 300 V (DC + peak AC)
With 10073C or 10074C 10:1 probe: CAT I 500 Vpk, CAT II 400 Vpk
Do not float the oscilloscope chassis: Defeating the ground connection and
“floating” the oscilloscope chassis will probably result in inaccurate measurements
and may also cause equipment damage. The probe ground lead is connected to the
oscilloscope chassis and the ground wire in the power cord. If you need to measure
between two live points, use a differential probe with sufficient dynamic range.
Do not negate the protective action of the ground connection to the oscilloscope.
The oscilloscope must remain grounded through its power cord or, on Option BAT
models, through its ground post. Defeating the ground creates an electric shock
hazard.