HP 54520 Series Service Manual page 21

Display Modes
Operating Characteristics
Screen Update Rate (typical at 500 ns/div, no measurements, and the trigger frequency is
250 kHz)
RealTime RecordLlength 512 8K 16K 32K
Updates/s 150 100 72 47
Repetitive Mode normal 8 averages 128 averages
Updates/s 150 100 100
Graticules You can choose full grid, axes, frame, or no graticule.
Number of Screens On the two-channel models you can select either one or two
screens. On the four-channel models you can select one, two, or four screens.
Connect-the-Dots Provides a continuous display, connecting the sample points with
straight lines. Connect-the-dots is operative for modes in which a single-valued waveform
can be connected, including average, envelope, single, and minimum-persistence modes.
Connect-the-dots is not available in the variable or infinite persistence mode.
Time Base in the Repetitive Mode
Averaging You can specify the number of averages in powers of 2, up to 2,048. On each
acquisition, 1/n times the new data is added to (n-1)/m of the previous value at each time
coordinate. Averaging operates continuously, except for the HP-IB digitize command, for
which averaging terminates at the specified number of averages.
Envelope Provides a display of the running maximum and minimum voltage levels at
each horizontal time position.
Minimum Persistence One waveform data value is displayed in each horizontal time
position of the display. The waveform is updated as new data is acquired for a particular
horizontal time position.
Variable Persistence You can vary from 500 ms to 10 seconds, the time that each data
point is retained on the display, or display the points indefinitely using infinite persistence.
Time Base in the Real Time Mode
Single Persistence One waveform data value is displayed in each horizontal time
position. The entire waveform is replaced with each new acquisition.
Infinite Persistence Waveform data is allowed to continuously accumulate on the
screen, and remains until display is cleared.
Oversampling Filter On time/division settings when less than 500 points are acquired
across the screen, a built-in digital filter automatically reconstructs the data. This filter is
a combination between a (Sin X)/X and a Gaussian filter (also known as interpolation).
Peak Detect Displays the amplitude of pulses that have a pulse width of 1 ns or wider
regardless of the time base setting. Peak detect works in real-time mode only at sample
rates <250 MSa/s.