1 general outline Describe

SHZ-DType constant speed source(hereinafter referred to as SHZ)-D）It is a specialized product designed and produced according to the technical requirements of JJG622-97 "Verification Regulations for Insulation Resistance Meters" and JJG366-2004 "Verification Regulations for Grounding Resistance Meters". It is the original SHZ-D constant speed source in our factoryUpgraded versionThe display mode is more intuitive, the mute effect is more prominent, the weight is lighter, and it fully meets the calibration needs of various positive and off axis hand cranked megohmmeters and grounding resistance meters. This instrument integrates the characteristics of various constant speed sources in China, combined with user feedback, and is driven by a stepper motor. The starting speed isThere are two gears, 120 rpm and 150 rpm, with a maximum designed speed of 250 rpm. The speed can be set arbitrarily through the speed control switch and does not fluctuate with load changes. Lightly touch the switch and coaxial balancing device to integrate the control system with the work,Easy to operate and reliable in performance.

2 host important skill art finger treetop

Speed range: 100 ～ 250 revolutions per minute

Constant speed point: 120 revolutions per minute, 150 revolutions per minute

refined Degree: ± 1 turn

Voltage used: 220V ± 22V 50Hz ± 5Hz

work Consumption: 100W

External dimensions(mm): 385×305×95

weight Quantity: 10kg

3 worker rise primary texture

Single chip microcontroller and crystal oscillator are used to generate motors that match the speed of the motor PWM The signal, start button, and speed control button are combined into a multifunctional key to jointly complete the functions of starting speed and step speed control. Generated by a microcontroller PWM After the signal is amplified by the driving circuit, it directly drives the stepper motor, which in turn drives the motor. The speed of the stepper motor is only determined by PWM It is determined by the frequency, regardless of the supply voltage. Therefore, its rotational speed will not change with changes in load.

4 send use square law

4.1 Structure diagram

(1) Speed display (2) Speed adjustment and start-up control (3) Power sockets and switches

(4) Locking knob of the inspected table (5) Coaxial balanced joint (6) Nylon pressure pad

(7) Lifting adjustment knob and motor horizontal adjustment knob (8) Lift platform

(9) Tilt adjustment Note:(7) Actually, there are two knobs

5 pour meaning matter term

If the motor loses step during use, press the button promptlyPress the "start stop" button, readjust the fixed position of the megohmmeter, and then restart to ensure normal operation. When verifying special specifications of megohmmeters and grounding resistance meters, the tested meter should be in an open circuit state before starting the instrument.