Which of the following frequency standards...

🔍 Key Concepts

• Frequency stability and accuracy requirements for typical field calibration and maintenance work • Differences between primary frequency standards (national labs, GPS, etc.) and secondary/working standards used by technicians • Practical considerations: size, cost, power consumption, warm‑up time for a portable time base

💭 Think About

• Which option is commonly found in portable test equipment like frequency counters and communication service monitors that a field tech would actually carry? • Which standard is precise enough for most field work, but not as expensive or complex as the highest‑end national time standards? • Looking at the four choices, which one is more likely used in national metrology labs or as a master reference rather than in everyday field gear?

✅ Before You Answer

• Eliminate any option that is primarily a laboratory or national standard rather than a working field standard • Consider which device balances good stability with reasonable cost and portability • Think about which technology is routinely built into commercial test instruments that technicians use in the field

Which of the following frequency standards is used as a time base standard by field technicians?

Quartz Crystal.

Rubidium Standard.

Cesium Beam Standard.

LC Tank Oscillator.