1803-A

The General Radio 1803-A Vacuum-Tube Voltmeter was available in Catalog M (1951) only.

The Type 1803-A is an AC vacuum-tube voltmeter with a range from 0.1 to 150 V_RMS at frequencies to 100 MHz without corrections. Except on the lowest range, it is peak-reading, but the scales are calibrated in RMS volts for sinusoidal voltages.

The 1803-A features a hard-wired probe containing a dual-diode vacuum tube rectifier. From 20 Hz to about 100 MHz, accuracy is ±3% but the instrument is usable up to 200 MHz, refer to the manual for details.

Specifications

• Voltage Range: 0.1 to 150 V_RMS
• Accuracy: ±3% of full scale on all ranges
• Input Impedance: 7.7 MΩ at low frequencies (see manual)
• Frequency: 100 MHz; up to 200 MHz with corrections

Links

• Experimenter April 1950 describing Type 1803-A
• 1803-B

Photos

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