Model note · Holter
Welch H3+ digital Holter recorder
The H3+ is a very small three channel ambulatory ECG recorder that records 24 or 48 hours of continuous ECG for later analysis on the HScribe Holter system. It is used in cardiology departments and clinics to investigate suspected arrhythmias, assess pacemaker patients and report heart rate variability. It runs on a single AAA cell, weighs about 28 g and does no analysis itself.
The model
Maker, model and type.
- Maker
- Welch Allyn, Inc. (Hillrom, now part of Baxter); originally Mortara Instrument
- Model
- H3+ digital Holter recorder
- Device type
- Holter
- Main document
- Open the public document
Key specifications
What the public record says.
| Item | Value | Source |
|---|---|---|
| Channels and leads | 3 channels acquired simultaneously; modified I, II, III, aVR, aVL, aVF and V | Source |
| Recording duration | 24 or 48 hours of continuous ECG | Source |
| Sampling and resolution | 180 samples per second per channel for recording and storage; 12 bit A/D | Source |
| Storage | Internal non volatile memory, up to 48 hours; data kept when battery removed | Source |
| Power | One AAA alkaline cell; internal lithium cell keeps the clock | Source |
| Size and weight | 64 x 25 x 19 mm; 28 g without battery | Source |
| Safety class | Type CF defibrillation proof applied parts, internally powered; meets IEC 60601-2-47 | Source |
| Special functions | Pacemaker detection and ECG display during hook up | Source |
| Data transfer | USB interface cable to HScribe or Web Upload; memory erased after download | Source |
| FDA clearance | 510(k) K043010 (Mortara Instrument), decision 25 February 2005, product code MWJ | Source |
Recalls
Recalls.
This note lists no recalls. Check the FDA recall database for the latest record.
Safety
Safety warnings from the record.
- Defibrillation protection relies on the original patient cable, which has at least 7 kilohm series resistance in each lead. Source
- Infants and children wearing the recorder must be closely supervised, and short lead wires are recommended for them. Source
- Use only the recommended battery cells; other cells may risk fire or explosion. Source
- Do not immerse, autoclave, steam clean or EtO sterilise the recorder or cables; wipe with a non alcohol disinfectant. Source
- Not recommended near MRI or CT equipment, and not designed for use with HF surgical equipment. Source
Sources
Where this note comes from.
- Welch Allyn H3+ user manual 9515-165-60-ENG Rev C
- Welch Allyn H3+ service manual 9516-165-50-ENG Rev K
- H3+ addendum to the table of messages 9515-165-60-MULT Rev B
- FDA 510(k) summary K043010, H3+ Holter recorder
- Baxter product catalogue page, H3+
- openFDA recall search, Welch Allyn Holter
Not covered: No FDA recall names the H3+ (the only Welch Allyn Holter recall found covers the H12+), and the MAUDE brand search for H3+ returns other manufacturers' products, so no reliable failure counts exist; some message table entries are symbols that do not reproduce as text.
BMEssentia knowledge drafted from public information, reviewed by Hasan Khaled Ismail on 2026-10-24. Always follow the manufacturer's instructions for use and service manual.
Holter