Optical Light Source K-528

A high-stability FP-LD light source for loss testing and fiber identification: 1310/1550 nm single-mode at −7 dBm (850/1300 nm multimode build available), CW or 270/1000/2000 Hz modulation, and 45 hours of work on three AA batteries.

Two builds cover the plant: 1310/1550 nm single-mode at −7 dBm output for FTTH, access and trunk work, or 850/1300 nm multimode at −20 dBm for premises and LAN fiber
CW or modulated: run continuous wave for power and loss readings, or switch to a 270 / 1000 / 2000 Hz tone so the far end can identify your fiber with a power meter or an identifier — without disconnecting anything
High-stability FP-LD output: wavelength and output power hold steady through a measurement run, which is what makes a loss figure repeatable from one visit to the next
Everything on the LCD: working wavelength and modulation state on one backlit display, switched with the λ and MODE keys — no guessing what the source is sending
Optional VFL on the same unit: the VFL key drives a built-in visual fault locator (build option), so one handheld launches the test signal and finds the visible fault
45 hours on three AA batteries, with auto-off for cabinet work; the metal dust cap rides on its chain so the FC port stays clean between jobs

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Checked before it ships

Functions verified against the ordered version before dispatch — the version table on this page is the exact build list.

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Your brand on it

Neutral instrument branding as standard; labeling per order.

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Stock & small lots

Instruments are supplied to the version you order; tell us the work and we will help you spec it.

Specifications

K-528 full specification

Wavelengths	1310/1550 nm (single-mode build); 850/1300 nm (multimode build)
Emitter	FP-LD laser
Output power	−7 dBm (1310/1550 nm); −20 dBm (850/1300 nm)
Modulation	CW / 270 Hz / 1 kHz / 2 kHz
Fiber type	Single-mode or multimode, by build
Connector	FC/PC
Display	Backlit LCD showing wavelength and modulation state
Power supply	3 × AA batteries
Battery life	45 hours
Operating temperature	−10 °C to +50 °C
Storage temperature	−20 °C to +70 °C
Weight	250 g

One K-528 optical light sourceUser manual

In the box: the parts above, packed per unit. Applications: Link and splitter loss measurement with an optical power meter — the K-527 is its matched meter · Fiber identification by tone: the 270/1000/2000 Hz modulation is picked up at the far end · Telecom and CATV engineering, construction and maintenance · Structured cabling installation and acceptance testing · Laboratory and training setups that need a stable reference source.

The other half of a loss measurement

A power meter alone can only say how much light arrived. To turn that into the loss of a link, you need a known, stable launch at the far end — that is the light source's job. The K-528 holds its output steady at −7 dBm on 1310/1550 nm, the meter reads what is left at the far end, and the difference is the link loss you sign off.

The modulation tones do a second job: set 270, 1000 or 2000 Hz and the tone travels with the light, so a technician at the far end can prove which fiber in a bundle is the one connected to the source — without disconnecting anything.

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