Protek B801 Manual Link -

reach their maximum levels. A loud "Beep" or "Lock" indicator usually confirms a successful signal hit. Product-Catalogue.pdf - Protek Manufacturing Corp.

), the B801 is built with a linear power supply and through-hole components, making it relatively easy to maintain or repair compared to modern surface-mount devices. Stability: Frequency stability is rated at after a 20-minute warm-up period. protek b801 manual link

: Common features include Data Hold, Min/Max/Avg recording, and RS-232 interfaces for data logging. reach their maximum levels