When strain measurement of structures and materials of different types of equipment used for static measurements.
ISD 3 - meter with manual trim. Transistor strain gauge with manual trim ISD -3 is designed for the measurement of static and slowly varying strains in one or many locations , has a built-in switch for 20 points and allows a multipoint connection switch. The device is made by the block diagram of the amplifier at the carrier frequency. To power the device used in the bridge rectangular pulses with a repetition rate of 275 Hz from the generator placed in the device.
Figure 1. Controls and adjustments meter ISD -3 with manual trim.
Fig. 1 shows the front panel of the instrument. In the lower right corner of the range is available with a slide wire dvuhstrelochnym pointer 2, Above the scale indicator is set zero 5, which is also the instrument of control voltage power supply, plug- tumbler 6. 5 is a toggle switch to turn on the device, and switch 6 - to monitor the bridge circuit without measuring path. 4 toggle switch on the device group or pair of strain gauges inclusion. The scale adjust pin. When you connect up to 20 half-bridges to plug connectors 7 channel switching is performed switch 4. Single half-bridges connected to terminals 5, these jumpers after 9 attach an external switch to any number of channels.
Strain gauge with automatic balancing of AID- 1M is designed for the measurement of static and slowly varying strains in one or many locations. In the latter case, the device is used with the switch. The device is made by the block diagram of a compensator with a reversible motor. Meals tensor meter ica bridge is powered by the 50 Hz. Input of the device is designed for half-bridge circuit incorporating strain gages.
Fig.2. Controls and gauges with automatic tuning and balancing а - AID- 1M, b - AID- 2M, в - AID- 4, g - view of the rear panel.
Fig . 2, and shows the front panel of the instrument. In the center is a scale of 1 to reohorda dvuhstrelochnym pointer 2, the light indicator balance in phase 5, the controller 4 of balancing the bridge by the reactive component, the main power switch 5, 6 terminals for connection of strain gauges or switch and ground terminal 7. On the back of the unit ( see Fig. 2d) placed pin 8 cord of your appliance, handle 9 gain control device , which is used to obtain optimal time reading to stabilize ( after one or two oscillations relative to the position of balance ), the switch 10 - voltage network power switch 11 and voltage of the bridge, as well as handle the zoom 12.