Independent RF / optical / high-speed test & instrument advisor based in China.
I help engineers, small labs and purchasing teams choose and source new & used test equipment (Keysight / Rohde & Schwarz / Anritsu, etc.) and arrange selective lab tests via partner labs in China.
Here I write practical notes on test setups, used instruments and China-based sourcing.
More info: https://maronlabs.com
Nothing here yet.
Jan 6 · 3 min read · This is one of the most confusing measurement issues I’ve seen in the lab—not because it’s rare, but because it looks so reasonable when it happens. You may have run into something like this: Same spectrum analyzer Same signal source Same settings...
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Dec 28, 2025 · 5 min read · One of the most stressful things in the lab is hearing (or saying): “Is the analyzer broken? The noise floor is suddenly 10 dB higher today.” Because this happens a lot.Yesterday the bench looked clean. Same instrument, same frequency range, same cab...
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Dec 21, 2025 · 6 min read · I’ve seen this scene way too many times: Same OFDM signal. Two engineers standing at the same bench.One reads -10 dBm, the other insists it’s -16 dBm.Then the guessing starts—did the DUT change state? Is someone’s instrument “not accurate”? Did someo...
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Dec 18, 2025 · 6 min read · If you do RF measurements long enough, you’ve probably seen this: Yesterday the power looked fine. Today—same board, same setup (supposedly), same instrument—the reading is off by 1 dB… sometimes 2 dB.And the most annoying part? Hand the job to anoth...
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Dec 16, 2025 · 6 min read · A lot of teams build an RF bench with the same instinct:“Buy one strong main instrument first (spectrum analyzer / scope / VNA). We’ll figure the rest out later.” But I’ve seen many projects stall even after the “big box” arrives—usually not because ...
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