Product overview The ST8 is a product for testing servos, with up to 28V voltage output, 8-channel signal output, current measurement, curve display and other functions. 4 channels of programmable independent signal, 8 channels of signal output, accuracy of 1 ms. 4 independent current acquisition, respectively, curve display. Multiple measurement modes (speed, count, step, linear). output PWM signals with a period of 33 to 1000 Hz. A variety of signal trigger sources (internal, buttons, knobs, external sources). Measure the response speed of the steering gear with an accuracy of 1 millisecond. The external input signal supports PWM/ PPM/ SBUS with an accuracy of 1 ms. The external input signal supports PWM/ PPM/ SBUS with an accuracy of 1 ms. Drive the servo with a maximum load of 100W. Multi-language system, you can upgrade the language you need. The device is simulated as a USB flash drive, and the upgrade file is copied to implement product firmware upgrade. After connecting the ST8 to the computer via the USB cable in the box. the computer will recognize the USB flash drive named Toolkit. Download the upgrade file app.upg on the official website to overwrite the files in the USB flash drive to upgrade the firmware. Specs: Input voltage: 7-28V@MAX 10A Main output port: 5.0V-28.0V@MAX 10A Signal port: 5.0V-8.4V@MAX 4A/S1-S4 Output voltage: 5.0V-8.4V@MAX 4A/S4 Ext. Output signal: 100us-2900us@33-1000Hz @S1-S4 PWM 500us-2500us@S5 PPM 8CH@S5 SBUS 16CH@S5 P1 rotation range: 1000us-2000us@P1 MicroUSB: Upgrade @ USB3.0 LCD display: 2.4 inch TFT RGB 320*240 resolution Product Size: 99mm*68mm*26mm Weight: 140g Packing Size: 105mm*80mm*45mm Weight: 160g.