> For the complete documentation index, see [llms.txt](https://docs.itradingbot.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.itradingbot.net/uk/ai-strategy-builder/machine-obv-oscillator.md). # OBV oscillator reference Shared reading rules — index notation, the `L`/`S`/`N` codes, crossings and Reverse — are on [Signal passports](https://docs.itradingbot.net/ai-strategy-builder/signal-passports). Main backtest settings and the card schema are on [Settings and card schema](https://docs.itradingbot.net/ai-strategy-builder/machine-settings). The behaviour contract is [Rules for AI assistants](https://docs.itradingbot.net/ai-strategy-builder/assistant-rules). Knowledge package 0.6.1, checked 22 September 2026, build 03613bfa. Use the shared role, Reverse and timing rules. The current ID `OBV_OSCILLATOR` is displayed as **On Balance Volume (OBV)**, but its condition uses a **normalized, smoothed oscillator**, not the raw cumulative OBV line. ## Calculation and settings The reviewed OBV input uses close and **quote volume**. Start with cumulative volume signed by the change in close. Subtract its EMA with period `ch_len`, giving D. Smooth abs(D) with the same period, multiply by `nm_coef`, and divide D by that denominator. Finally smooth the normalized series with an EMA of period `avg_len`. Call the result O. Defaults: ch\_len=5, avg\_len=10, nm\_coef=0.015, up=75, low=−75. ch\_len and avg\_len are integers 2…200. The reviewed constructor does not establish complete bounds or an up>low guard for nm\_coef/up/low. Do not import RSI's thresholds or assume a validated channel ordering. A zero normalization denominator is undefined in the reviewed calculation; it is not an invented zero oscillator value. ## Entry — obv-oscillator.entry `CEC`: O1>low and O0<=low gives L; otherwise O1\=up gives S; otherwise N. `CRTC`: O1\=low gives L; otherwise O1>up and O0<=up gives S; otherwise N. These are channel events with current equality included and first-branch priority. The mean and normalization periods do not create an MA crossover rule. ## Filter — obv-oscillator.filter `BIC`: low<=O0<=up gives AA; otherwise N. Both boundaries are included. `BHL`: O0>up gives IL; otherwise O0\