# Attenuator — For NMR Calculations

> Utility for RF power, voltage, and NMR pulse calculations, with magnetic field and pressure readings. (iPhone/iPad app by Tim E. Burrow.)

- Source: https://appshunter.io/ios/app/attenuator/id367216554 (this page in markdown: same URL + `.md`)
- Developer: [Tim E. Burrow](https://appshunter.io/developer/367216557)
- Category: Utilities, Reference
- Price: Free with in-app purchases
- Rating: 5.00/5 from 8 App Store ratings · 10 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 1 MB
- Languages: English, French, Japanese, Korean, Chinese, Spanish, Chinese
- Released: 2010-04-22
- Data updated: 2026-07-29
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/attenuator/id367216554/reviews.md

## What is Attenuator?

Attenuator is a utility for anyone working with radio frequency sources and needs to know power and voltage after attenuation. 

You can specify an input voltage (Vpp or Vrms) and dB of attenuation to get the output voltage, power and attenuation. The impedance can be specified, typically 50Ω for most systems.

There is a new emphasis on NMR utility, with options for calculating pulses based on reference power and pulse length. Powers are in Watts, dBm, and dB values.

Measure local magnetic field to check stray static fields from magnets.

See the local barometric pressure, useful if the magnet boil-off is high

## Key features

- Calculate output voltage and power
- Specify input voltage (Vpp or Vrms)
- Calculate attenuation in dB
- NMR pulse calculations
- Measure local magnetic field
- Display barometric pressure

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove all ads | $1.99 | one-time |


## Recent user reviews (10 of 10)

All indexed reviews: https://appshunter.io/ios/app/attenuator/id367216554/reviews.md

### 5/5 — Mmmmm ok

*2022-08-24, version 3.1.1*

Work ok good

### 5/5 — Good

*2019-07-18, version 3.1.1*

Good

### 4/5 — 測試中

*2018-12-17, version 3.1.1*

測試中

### 5/5 — RJ

*2018-02-22, version 3.1.1*

Nice

### 5/5 — Attenuator

*2017-12-16*

Provides rapid calculations of power and output powers after chosen attenuation

### 5/5 — Nice

*2016-05-24, version 3.1.1*

Love it!

### 5/5 — Great app

*2016-02-19, version 3.1.1*

Great app! Good job

### 5/5 — Useful tool

*2015-03-06, version 3.1.1*

Useful tool.

### 5/5 — Excellent!

*2015-01-26, version 3.1*

Great app and very useful.

### 5/5 — Easy to use

*2013-09-08, version 2.0*

Very easy to use, great app!

## Frequently asked questions about Attenuator

### What is Attenuator used for?

Attenuator is a utility app designed for calculating output voltage, power, and attenuation based on input values and dB of attenuation. It also includes specific features for NMR calculations and environmental measurements.

### Does Attenuator have ads?

No, Attenuator does not contain advertisements. It is a free application with optional in-app purchases.

### What devices does Attenuator support?

Attenuator is currently supported on iPhones. It was last updated on January 5, 2025, with version 5.11.

### How accurate are Attenuator's magnetic field measurements?

Attenuator measures the local magnetic field to check for stray static fields from magnets. Specific accuracy details are not provided, but it serves as a utility for checking these fields.

### What is the age rating for Attenuator?

Attenuator has an age rating of 4+, making it suitable for a wide range of users. It was first released on April 22, 2010.

### Can Attenuator calculate NMR pulse parameters?

Yes, Attenuator has a specific emphasis on NMR utility, offering options for calculating pulses based on reference power and pulse length.

### What is the user sentiment for Attenuator?

Attenuator has received overwhelmingly positive feedback, indicated by its perfect rating of 5.0 stars from 8 ratings.

### What are the units for power calculations in Attenuator?

Power calculations in Attenuator are available in Watts, dBm, and dB values, providing flexibility for different user needs.

## Version history (last 5 releases)

### 5.50 — 2026-07-01

- Added Spanish and Korean localizations
- Improved translations across the app, especially for NMR, RF power, magnetic field, and accessibility text
- Improved VoiceOver support for Field, Barometer, Power, Pulse, and Settings
- Improved spoken units for VoiceOver, including dB, dBm, Vpp, Vrms, watts, tesla, pressure units, and pulse durations
- Improved Dynamic Type and long-language layout on the Field, Barometer, Power, and Pulse tabs
- Improved the Power calculator, including attenuation slider behavior, dB/dBm entry, unit prefixes, keyboard handling, and saved settings
- Improved the Pulse calculator, including localized labels, NMR pulse/power wording, keyboard handling, and long text layout
- Improved the magnetic field and barometer screens, including safer warning text, barometer unit selection with VoiceOver, and better error handling
- Removed deprecated UI code paths and fixed warnings
- Improved UI and general reliability
- Ad-free and fully unlocked, with no in-app purchases

### 5.11 — 2025-01-05

Fixed error in barometer display.

### 5.1 — 2025-01-04

- Fixed barometer crashing
- Fixed Vpp/Vrms display

### 5.0 — 2022-10-25

Thorough graphics refresh.

### 3.1.1 — 2015-02-12

This app has been updated by Apple to display the Apple Watch app icon.

More digits displayed in power calculations
Small bug fixes

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## More apps by Tim E. Burrow

- [NMR Tutor](https://appshunter.io/ios/app/nmr-tutor/id785450176)

All apps by Tim E. Burrow: https://appshunter.io/developer/367216557

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-29.*