Archive for October 2015

EDC/Krohn-Hite MV216A DC Voltage Standard Teardown and Tempco Measurement

In this blog post, we are going to take a look at Electronic Development Corporation’s (EDC, acquired by Krohn-Hite in 1998) MV216A battery/external powered DC voltage standard and also measure its voltage reference’s temperature coefficient (tempco). A teardown video is also included towards the end. MV216A is a six decade precision DC voltage standard, it can output from 0.1µV in 100mV range all the way up to 11.1111V in 10V range. Voltage standards of this caliber are usually used as calibrators to calibrate multimeters and other test instruments. Continue reading ‘EDC/Krohn-Hite MV216A DC Voltage Standard Teardown and Tempco Measurement’ »

The Spectrums of Three Cheap Laser Pointers

A couple of months ago, I converted my EP200Mmd monochromator into a scanning monochromator and tested the spectrums of quite a few light sources. This time, I will take take a look at the spectrums of three cheap eBay laser pointers using the same technique. Continue reading ‘The Spectrums of Three Cheap Laser Pointers’ »

Interfacing HDC1050 with Arduino

Recently, I got my hands on TI‘s HDC1050 low power, high accuracy digital humidity/temperature sensor chip. The supply voltage of this chip can range between 2.7V and 5V, making it possible to interface with 5V MCUs such as Arduino directly. I created an Ardunio library for this sensor and will discuss its usage in this post. The code can be downloaded towards the end and can also be found on my GitHub page. Continue reading ‘Interfacing HDC1050 with Arduino’ »

Direct Measurement of the Speed of Light using a Cheap Laser Diode – II

In my previous blog post, I discussed the basic TOF method for direct measurement of the speed of the light. In order to measure the time of flight accurately, we need to be able to both generate and detect very fast rising signals. One way to generate a fast rising, short duration laser beam is via an avalanche pulse generator as we discussed previously. In this blog post, we will take a look at the receiver end and conduct some experiments. A video of the experiment is included towards the end. Continue reading ‘Direct Measurement of the Speed of Light using a Cheap Laser Diode – II’ »