The General Radio 1840A measures audio-frequency power into any desired load. Its important uses include the measurement of:
Power output of oscillators, amplifiers, preamplifiers, transformers, transducers, and low-frequency lines.
Output impedance, by adjustment of the load to yield maximum power indication.
Frequency-response characteristics of amplifiers, transformers, and other audio-frequency devices.
Acoustical Output: ◦Frequencies: 125, 250, 500, 1000 and 2000 Hz
Frequency Accuracy: ±3%
Output Level: 114 dB re 20 x 10-6 µN/m-2
Level Accuracy: at 23oC and 790 mm Hg:
±0.3 dB @ 500 Hz;
±0.5 dB @ other frequencies.
Output Voltage: 1.0 V ±20% behind 6000 Ω.
Frequency Characteristic: Output is flat ±2%.
Distortion: < 0.5%.
Operating Environment: 0 to 40oC, 0 to 95% relative humidity.
