![]() Schneider)īecause the sensitivity of the selenium cell is a known constant, the current produced for a given amount of light hitting it is predictable and the needle is calibrated to match the correct exposure on the readout.Īn array of tiny convex lenses that look like a honeycomb of bubbles help direct light to the photocell to get an accurate reading. ![]() A close-up of the selenium photovoltaic cell light-gathering array on my Kodak Retina Reflex IV’s light meter. The distance the needle moves is dependent on the current being produced. Light meters use this current to power a D’Arsonval movement - a tiny electromagnet that turns a needle. Selenium becomes excited when exposed to light and emits a small electrical current. Prior to the 1960s most cameras that had a built-in light meter used a circuit centered around a selenium photovoltaic cell. I’m going to try to stick mostly to layman’s terms and will provide links to more detailed descriptions of the science at work. In this article I will try to cover some light meter basics and offer suggestions for how to get your old camera’s light meter working with modern batteries. If you’re into old cameras, you’ve almost certainly encountered some designed to use now-banned mercury batteries. If the voltage reading falls below 1.5v, replace the battery with a new one to ensure optimal performance.625 battery options From left: An original 1.35-volt Mallory 625 mercuric oxide battery, a modern Duracell alkaline 625A battery, and an MR-9/PX-625 adapter for a 1.55-volt 389 silver oxide battery. By following these six easy steps, you can easily test your 1.5v batteries for voltage and ensure they are still good. ![]() Using a multimeter to test a 1.5v battery’s strength and quality is a simple process that can help prolong the lifespan of your device. If you are testing a pack of 1.5v batteries, repeat the process for each battery to ensure that they all provide similar voltage readings. If the reading is above 1.6v, the battery is overcharged and should not be used. If the reading is below 1.5v, this indicates that the battery is almost dead, and you should replace it. For a healthy 1.5v battery, the multimeter will read between 1.5v and 1.6v. Once everything is connected, it is time to read the multimeter. Ensure that you firmly connect the jumper wires to the battery’s terminals. ![]() Take the 1.5v battery and connect the positive (red wire) to the battery’s positive or plus-side while connecting the negative (black wire) to the battery’s negative or minus side. The positive port is usually denoted by a “+” symbol, while the negative port is denoted by a “-” symbol. Take the positive and negative jumper wires and attach them to the multimeter’s positive and negative ports. This setting is usually denoted by a “V” with a straight line or dashed line above it. Switch on the multimeter and set it to measure DC voltage (direct current). Ensure you have a reliable multimeter and specific jumper wires that will fit your multimeter’s ports. These include a 1.5v battery, a multimeter, and a few jumper wires. The first step is to gather all the materials you will need to test your battery. Here are some steps to use a multimeter to check if a 1.5v battery is still good: One way to test a 1.5v battery’s health is by using a multimeter. It is essential to ensure that your device’s battery is still good and provides sufficient power to operate your gadgets. Batteries are commonly used to power a variety of electronic devices such as flashlights, remote controls, and calculators.
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