# UltraStudio 4K Mini monitoring

If you're using the Blackmagic UltraStudio 4K Mini with HDMI out to a reference monitor and OmniScope shows no signal, the fix is a simple SDI loopback cable.

{% embed url="<https://youtu.be/c5vJ3VaNM8Y>" %}
Quick Tip: OmniScope + UltraStudio 4K Mini setup
{% endembed %}

## The Problem

The UltraStudio 4K Mini sends your video over HDMI to the reference monitor, but OmniScope needs an SDI signal to analyze the video. Without an SDI input, OmniScope has nothing to capture.

## The Solution

Connect a short SDI cable from the **SDI OUT** port back into the **SDI IN** port on the UltraStudio 4K Mini. This creates a loopback that feeds the same video signal back for OmniScope to capture.

## Signal Flow

The full signal path looks like this:

1. **Mac** sends video over **Thunderbolt** to the UltraStudio 4K Mini
2. **HDMI OUT** goes to the **reference monitor** (your monitoring stays exactly the same)
3. **SDI OUT** loops back into **SDI IN** via a short SDI cable
4. **OmniScope** captures the signal from the SDI input

You're simply adding a parallel path for scopes — your existing monitoring workflow is not affected.

## Setup Summary

| Connection     | From                | To                  |
| -------------- | ------------------- | ------------------- |
| Thunderbolt    | Mac                 | UltraStudio 4K Mini |
| HDMI           | UltraStudio 4K Mini | Reference Monitor   |
| SDI (loopback) | SDI OUT             | SDI IN              |

## OmniScope Configuration

Open OmniScope, go to **Connect To** and select the **UltraStudio 4K Mini** as your input device.

{% hint style="info" %}
That one SDI loopback cable is usually the missing piece when OmniScope shows no signal with the UltraStudio 4K Mini.
{% endhint %}


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