> ## Documentation Index
> Fetch the complete documentation index at: /llms.txt
> Use this file to discover all available pages before exploring further.
# Oscilloscope Trace
> CRT oscilloscope beam sweeping a waveform across a 10x8 graticule, with closed-form phosphor persistence: the tail decays as exp(-age/tau) and brightens where the beam slows
# Oscilloscope Trace
CRT oscilloscope beam sweeping a waveform across a 10x8 graticule, with closed-form phosphor persistence: the tail decays as exp(-age/tau) and brightens where the beam slows
**Oscilloscope Trace**
```html oscilloscope-trace.html
Oscilloscope Trace
OSCILLOSCOPE
SOURCESINE
FREQ-
TIMEBASE-
VERT-
PHOSPHOR-
```
Copy npx hyperframes add oscilloscope-trace to the clipboard
That writes one file: `compositions/oscilloscope-trace.html`.
## Add it to your video
It runs for 6 seconds at 1920×1080. Paste this into your composition:
```html index.html
```
Move it in time with `data-start`. Put it on a different timeline row with
`data-track-index`. See [data attributes](/concepts/data-attributes.md) for the rest.
## Variables
Every one of these has a default, so the piece works untouched. Set the ones you
want to change on the element:
| Variable | Default | Accepts | What it does |
| - | - | - | - |
| `waveform` | `sine` | `sine`, `square`, `triangle`, `data` | |
| `frequency` | `12` | 0.1Hz to 200Hz, step 0.1Hz | |
| `amplitude` | `3` | 0.1div to 4div, step 0.1div | |
| `persistenceMs` | `100` | 1ms to 1000ms, step 1ms | |
| `phosphorColor` | `#5dff8f` | color | |
| `sweepRate` | `5` | 0.25sweeps/s to 60sweeps/s, step 0.25sweeps/s | |
| `dataSeries` | \`\` | string | |
Set them with `data-variable-values` on the element that mounts it. These are the
defaults, so this behaves exactly like the preview above until you change one:
```html wrap
```
{/* hf:generated-footer */}
Tagged `instrument` `data` `showcase` `retro`.
## Related topics
* [Browse the complete Catalog](/catalog.md)
* [Add assets and Catalog items in the browser editor](/studio/assets-and-blocks.md)
* [Put blocks together into one video](/concepts/compositions.md)