1. The battery is a 300mAH battery with a voltage of 3.7V, model 14250 (battery not include)

2. The charge and discharge interface is microUSB; the voltage is DC5V

3. The benchmark is not in use. Fully charge in sequence every two months. The board has built-in charge management and charge and discharge protection. Pay attention to the battery polarity.

4. The output interface is a 2㎜ banana socket, and there is an SMA output interface
Calibration using HP3458A eight-and-a-half-digit multimeter (use after sufficient warm-up)
The calibration value is six and a half digits, which is accurate and reliable. It is recommended to re-calibrate every two years according to the needs of use.
The calibration condition, time and calibration value record card will be pasted on the benchmark, please keep it properly

5. Press and hold for 2 seconds to turn on the machine, and the four indicators will light up at the same time when turning on, and then output 2.5V reference voltage
After booting up, short press the button to switch the gears, in turn 2.5V-5V-7.5V-10V
Long press for three seconds to shut down, and the voltage indicator will go out immediately after shutting down

Package includes:
1 x Precision Voltage Reference Module