Demo, teardown and reverse engineering of the Tolicore 3720 Femtoammeter and voltage source.
https://tolicore.com/products/3720-femtoammeter-voltage-source/
https://tolicore.com/product-documents/3720-Datasheet.pdf
Keithley low current measurement handbook: https://www.tek.com/en/documents/product-article/keithley-low-level-measurements-handbook—7th-edition
Counting LED photons video: https://www.youtube.com/watch?v=TJcMgoJ4DOE

00:00 – Femtoammeter measurement
01:16 – Tolicore 3720 Femtoammeter unboxing
03:39 – Power on and UI
05:18 – 20pA full scale range
10:13 – Bluetooth and
11:35 – Humidity measurement is important
12:21 – Crazy sensitive!
13:45 – LED as a current source demo
15:28 – 1nA measurement test
16:43 – Burden voltage and electrometer input + self calibration
20:14 – Teardown
22:20 – Voiding the warranty
25:05 – Reverse engineering
27:32 – How a PCB guard ring works
33:52 – Humidity matters
34:33 – The voltage output
35:23 – Porcelain Multilayer Capacitors
36:22 – Voltmeter input
38:24 – Potentiostatic and Amperostatic Coulometry
40:15 – ADA4530-1 Internal schematic
42:25 – Contamination and PCB assembly cleaning matters
44:03 – Rogers PCB material

Forum: https://www.eevblog.com/forum/blog/eevblog-1755-tolicore-femtoammeter-teardown-reverse-engineer/

Tolicore 3720 Femtoammeter 和电压源的演示、拆解与逆向工程。
https://tolicore.com/products/3720-femtoammeter-voltage-source/
https://tolicore.com/product-documents/3720-Datasheet.pdf
Keithley 低电流测量手册：https://www.tek.com/en/documents/product-article/keithley-low-level-measurements-handbook—7th-edition
计数 LED 光子视频：https://www.youtube.com/watch?v=TJcMgoJ4DOE

00:00 – Femtoammeter 测量
01:16 – Tolicore 3720 Femtoammeter 开箱
03:39 – 开机及用户界面
05:18 – 20pA 满量程范围
10:13 – 蓝牙及
11:35 – 湿度测量很重要
12:21 – 极其灵敏！
13:45 – 将 LED 作为电流源演示
15:28 – 1nA 测量测试
16:43 – 负担电压与静电计输入 + 自校准
20:14 – 拆解
22:20 – 放弃保修
25:05 – 逆向工程
27:32 – PCB 保护环的工作原理
33:52 – 湿度很重要
34:33 – 电压输出
35:23 – 陶瓷多层电容
36:22 – 电压表输入
38:24 – 恒电位库仑法和恒电流库仑法
40:15 – ADA4530-1 内部原理图
42:25 – 污染与 PCB 组装清洁问题
44:03 – Rogers PCB 材料

论坛：https://www.eevblog.com/forum/blog/eevblog-1755-tolicore-femtoammeter-teardown-reverse-engineer/