Product overview
6426A is a handheld optical time domain reflectometer with a 7-inch capacitive touchscreen for fibre-link length, loss, splice-quality testing and fault location. Select single-mode OTDR modules by wavelength and dynamic range for installation, maintenance and fault recovery in FTTR and FTTH communications networks.
Key features
- Automatic and expert OTDR modes; automatic test setup with trace and event-list results.
- Graphical event map, multifibre tests and loss measurements.
- Integrated VFL, optical power meter and stabilized light source; the light source supports continuous and modulated output.
- 1625 / 1650 nm configurations support live-fibre testing for maintenance of GPON / XGPON networks.
Core specifications
| Parameter | Specification |
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| Display and controls | 7-inch capacitive touchscreen |
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| Maximum dynamic range¹ | 28 dB, depending on module and test conditions. |
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| Fibre-link measurement range | 3 m–100 km; select the configuration for link loss and module capability. |
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| Minimum event dead zone² (typical) | 3 m |
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| Finest sampling resolution | 2.5 cm |
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| Splice-event identification | Identifies splice events with loss >0.1 dB. |
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| File formats | Bellcore GR196; SR-4731 |
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| Communication wavelengths for live-fibre tests | 1270 / 1310 / 1490 / 1550 / 1577 nm; for 1625 / 1650 nm test configurations. |
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Single-wavelength modules
| Module model | Wavelength / fibre type | Dynamic range¹ (dB) | Event dead zone² (m, typical) | Attenuation dead zone³ (m, typical) |
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| 6426A-1101 | Single-mode (SM) 1625 nm | 28 | 3.0 | 8.0 |
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| 6426A-1102 | Single-mode (SM) 1650 nm | 28 | 3.0 | 8.0 |
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Dual-wavelength modules
| Module model | Wavelength / fibre type | Dynamic range¹ (dB) | Event dead zone² (m, typical) | Attenuation dead zone³ (m, typical) |
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| 6426A-2101 | Single-mode (SM) 1310/1550 nm | 28/26 | 3.0 | 8.0 |
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| 6426A-2102 | Single-mode (SM) 1310/1550 nm | 26/24 | 3.0 | 8.0 |
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| 6426A-2103 | Single-mode (SM) 1310/1550 nm | 24/22 | 3.0 | 8.0 |
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Specification conditions
- ¹ Dynamic range: ambient temperature 23 °C±5 °C, maximum test pulse width, averaging time >180 s, SNR=1.
- ² Event dead zone is typical: range ≤1.6 km, pulse width 5 ns, fibre end-face return loss ≥40 dB.
- ³ Attenuation dead zone is typical: range ≤1.6 km, pulse width 5 ns or shorter, fibre end-face return loss ≥50 dB.
- For dual-wavelength modules, dynamic-range values follow wavelength order; the maximum is not shared by all wavelengths.
Standard configuration
| Item | Quantity | Description |
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| Power supply assembly | 1 | Input AC 100–240 V, 50/60 Hz; output DC 5 V, 2 A. |
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| TF card | 1 | 32G capacity, installed inside the instrument, including analysis software. |
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| User manual | 1 | — |
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| Product conformity certificate | 1 | — |
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| Dedicated soft carrying bag | 1 | — |
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| VFL visual fault locator | 1 | 650±20 nm; 10 mW |
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| OPM optical power meter | 1 | 850–1650 nm; −60–+3 dBm |
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| Stabilized light source (LS) | 1 | Same wavelength as the OTDR; output power ≥−5 dBm. |
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Optional accessories
| Option model | Item |
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| 6426A-001 | SC adapter |
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| 6426A-002 | ST adapter |
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OTDR connector selection
| Ordering suffix | Connector |
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| FA | FC/APC |
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| FU | FC/UPC |
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Additional information
Select wavelength, link-loss capability, dynamic range and connector for the application. VFL, OPM and the stabilized light source are standard for this model; SC and ST adapters are selected separately. The product photo shows a representative configuration, and specifications of different modules are not combined into one module. Price and delivery are quoted for the actual configuration.
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