1803-A

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

The Type 1803-A is a 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, its peak reading but the scales are calibrated in RMS volts for sinusoidal voltages. It features hard-wired probe containing dual-diode vacuum tube rectifier. The probe tip is shorted when in the stored position for the zero adjust function. From 20 Hz to about 100 Mhz the accuracy is ±3% but usable up to 200 MHz, refer to the manual.

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

Photos

• 
• 
• 
• 
• 
• 
• 
• 
•