Fiber Optic Power Meter (-70 to +6 dBm) with FC/SC/LC Adapters (FPM-70)

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The Jonard Tools FPM-70 is the high-sensitivity power meter in the FPM line, reading optical signals down to −70 dBm, which is where long-haul links, PON splits, and runs with a lot of loss leave you. Its InGaAs detector covers 800 to 1700 nm and is calibrated at eight wavelengths from 850 to 1650 nm, so it reads multimode and single-mode sources, the 1490 and 1625 nm wavelengths used in PON and maintenance work, and the 980 nm pump wavelength, each against a stored calibration rather than a nearest guess. Paired with a Jonard FLS-50 or FLS-55 light source it sets the wavelength on its own, and it recognizes a 270 Hz, 330 Hz, 1 kHz, or 2 kHz modulated signal as well as continuous light, so a toned fiber identifies itself. The color 2.4 in display reads in dBm, dB, or watts at 0.01 dB resolution, a kickstand on the back stands it up on a tray or a bench, and it runs more than 50 hours on three AA batteries. It comes with FC and SC adapters, an FC-to-LC adapter for single-mode LC, two cleaning swabs, the batteries, and a protective carrying case.

Features

• Reads down to −70 dBm. Measurement range of +10 to −70 dBm, for long-haul and high-loss links where a standard meter runs out of sensitivity.
• InGaAs detector, 800 to 1700 nm. Covers every multimode and single-mode wavelength in use.
• Calibrated at eight wavelengths. 850, 980, 1300, 1310, 1490, 1550, 1625, and 1650 nm, for accurate readings at the wavelength the link actually uses.
• Automatic wavelength identification. With a Jonard FLS-50 or FLS-55 light source, the meter sets its wavelength to match the source.
• Recognizes modulated signals. CW, 270 Hz, 330 Hz, 1 kHz, and 2 kHz, so a toned fiber is identified at the meter.
• Absolute power and relative loss. Reads in dBm, dB, or watts at 0.01 dB resolution, with linearity of 0.12 dB or better and ±0.2 dB uncertainty.
• Color 2.4 in LCD and kickstand. Readable in a closet, and it stands up on a splice tray or a bench.
• 50+ hours on three AA batteries. With a 10-minute auto-off that can be turned on or off.
• Complete in the case. FC and SC adapters, FC-to-LC adapter (single-mode only), two cleaning swabs, three AA batteries, and a protective carrying case.

Where It Fits

It suits telecom and ISP technicians measuring receive power on long-haul and metro links, FTTH and PON work where a 1:32 or 1:64 split puts the signal below what a general-purpose meter can see, installers certifying single-mode links by insertion loss at 1310, 1490, 1550, and 1625 nm, maintenance crews reading power at 1625 or 1650 nm on a live network, data center teams checking transceiver output and receive levels, and anyone who already has a standard meter and keeps finding links it reads as "low".

Good to Know

The sensitivity is the reason to buy this meter, and the +10 dBm top end is the trade: it will read a transceiver or a light source directly, but not a high-power amplifier output, which is a job for a meter rated to +26 dBm. Set the wavelength to match the source before you read, or let the meter do it with an FLS-50 or FLS-55, because a reading at the wrong calibration point is off by whole dB; the eight stored wavelengths cover what you're likely to meet, and the manual calibration in the documentation below is for fine-tuning against a known reference, not for everyday use. For a loss measurement, reference the source into the meter through a clean reference cord, zero it in dB mode, then insert the link; in dBm mode you're reading absolute power, which is what you want at a receiver. The FC-to-LC adapter is for single-mode LC only. Clean every connector before every mating, including the port on the meter; the swabs in the box are for that, and most bad readings are dirt. Never look into a live fiber or a light source; the light is infrared and invisible, and 1625 nm maintenance wavelengths can be carried on a fiber that's in service. The auto-off is 10 minutes and can be disabled for a long test, and the meter runs from −10 to +60 °C, so a winter cabinet is within range.

Specifications

Documentation