{"id":971,"date":"2018-01-10T13:00:43","date_gmt":"2018-01-10T13:00:43","guid":{"rendered":"http:\/\/chewett.co.uk\/blog\/?p=971"},"modified":"2018-01-28T21:37:33","modified_gmt":"2018-01-28T21:37:33","slug":"review-youtumall-usb-multimeter","status":"publish","type":"post","link":"https:\/\/chewett.co.uk\/blog\/971\/review-youtumall-usb-multimeter\/","title":{"rendered":"Review of the\u00a0Youtumall USB Multimeter"},"content":{"rendered":"

This post reviews the\u00a0Youtumall USB Multimeter. This can be used for measure the voltage\/current used by a USB peripheral.<\/span><\/p>\n

<\/p>\n

The\u00a0Youtumall USB Multimeter<\/span><\/h2>\n

\"\"<\/a>This small USB device acts as a small two port USB hub. However one of the key features of it is that it has a digital display that shows the voltage and current of connected devices.<\/p>\n

When first plugging it into a USB port or charger it will only show the voltage. The current should be at 0. This is because\u00a0until you plug in something on the output ports there will be no load.<\/p>\n\n\n\n\n\n
USB Multimeter Electrical Specification<\/strong><\/td>\n<\/tr>\n
Operating Voltage<\/td>\n3.2 to 10 Volts<\/td>\n<\/tr>\n
Operating Current<\/td>\n0 to 3 Amps<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The recommendation is that this can test the voltage and current from USB chargers, battery pack charger and computer USB ports.<\/p>\n

Testing the Multimeter<\/h2>\n

The initial test was plugging the multimeter into a laptop USB port. The initial state, as shown in the above picture, shows that it is reporting 5.08 volts from the port. This is an acceptable voltage for a USB port as this should be near 5 volts.<\/p>\n

Once I had tested the multimeter without a load I attached an iPhone SE to one of the output ports. This is shown below.<\/p>\n

\"\"<\/a>
Charging an iPhone SE attached to the multimeter from a computer.<\/figcaption><\/figure>\n

Here we can see that\u00a0after attaching the phone the current measures 0.90 amps. It is also important to note that the voltage has dropped. This can occur when a high load is placed on a device. A USB port was not designed to deliver a large current needed for charging phones. This then can cause the voltage to drop. The Drop is not significant to cause issues and therefore isn’t an issue. However this is something that needs to be kept in mind when connecting high load devices.<\/p>\n

In comparison in the below picture I have attached the iPhone to an external battery pack.<\/p>\n

\"\"<\/a>
Charging an iPhone SE attached to the multimeter from an external battery pack.<\/figcaption><\/figure>\n

The charger, unlike the USB port on the computer, is designed to provide a high current to charge mobile devices. This shows that is able to deliver a good 4.99 Volts at the 0.85 amps that the phone requires to charge.<\/p>\n

Final Review<\/h2>\n

As a cheap multimeter to test the amount of current a USB device pulls it is very useful. This can also be useful in situations where you want to check that the voltage isn’t\u00a0being pulled too low by a\u00a0high current. In addition, the two output ports are quite useful to test the load of multiple devices.<\/p>\n

Overall as a simple multimeter for USB devices this works pretty well and I would buy it again!<\/p>\n

This product is available for purchase at Amazon<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

This post reviews the\u00a0Youtumall USB Multimeter. This can be used for measure the voltage\/current used by a USB peripheral.<\/p>\n","protected":false},"author":1,"featured_media":975,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[97],"tags":[217,216,152,178],"class_list":["post-971","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electronics","tag-ameter","tag-multimeter","tag-sensor","tag-voltmeter"],"wppr_data":{"cwp_meta_box_check":"No"},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/01\/usb_multimeter_post_icon.jpg?fit=800%2C800&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p2toWX-fF","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":1049,"url":"https:\/\/chewett.co.uk\/blog\/1049\/wemos-d1-mini-not-recognised-windows-no-com-port\/","url_meta":{"origin":971,"position":0},"title":"Wemos D1 Mini not recognised by Windows with no COM port","author":"Chewett","date":"March 7, 2018","format":false,"excerpt":"This blog post describes what you can do if Windows doesn't recognise the Wemos D1 Mini and there is no COM port to use it. 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