SZJ-4 Standard speed generating deviceDetailed product description：

The SZJ-4 standard speed generator is a small DC reversible speed control system controlled by intelligent digital and analog signals It is an improved product of our factory SZJ-3 As a third class standard speed device, it adopts a speed single closed loop with cutoff protection and uses a microprocessor as the controller. Its volume, weight, cost, and control accuracy are all superior to those of a pure analog control dual closed loop system In addition to using DC chopper type voltage regulation and speed control, relay switching and direction adjustment also add analog control speed regulation methods to meet the needs of special users for meter calibration This device consists of three parts: controller, driver, and gearbox, mainly used for verifying mechanical tachometers and speedometers below level 0.5

Main technical indicators
Output speed range: 20-30000r/min
Motor adjustment range: 200-3000 r/min resolution 1 r/min
Transmission ratio of gearbox: 10 times acceleration and 10 times deceleration
Output torque: High speed shaft 0.05N. m
Transfer speed 0.5 N.m
Low speed 0.5 N.m
Output speed accuracy: 20-500 r/min ≤ 0.3%
501～30000 r/min≤0.1%
Allowable continuous use time: 2h
Operating environment: Temperature range of 15-30 ℃, relative humidity not less than 75%, non corrosive gas.
Power supply: three-phase four wire AC power supply, phase voltage 220V 50Hz. Single phase power supply 220V 50Hz.
Dimensions: Controller 139 × 440 × 360 (mm) Height × Width × Depth
Drive 139 × 440 × 360 (mm) height × width × depth
Transmission 160 × 214 × 480 (mm) height × width × depth