The display unit inside had a sticker that not only showed the company that made it, but also had their Telex number on it, another sign of the times. You can see the device in the video below.

HD Electric Company ’s DVM-80T Digital Voltmeter & Phasing Set with Capacitive Test Point Mode is a new addition to the digital voltmeter line. This compact unit is designed to measure voltages up to ...

This digital thermometer circuit diagram uses a common 1N4148 diode as the temperature sensor. The temperature coefficient of the diode, -2 mV/°C is exploited for this application to create an ...

This comes in handy for seeing trends and observing changes. Once the voltage is stable, a digital reading displays as two digits of 5×3 matrix dots, with a resolution of 0.1 V (Fig. 3). 3.