Accessories (Models 8920, 8931, 8942, 8951, and 8957)
Model 8920 – Digital Tachometer*
The Digital Tachometer, Model 8920, indicates motor rotation speed either in a clockwise or counterclockwise direction. The measured speed is automatically indicated on a high-visibility, five-digit display and is updated every second to enable measurement of acceleration and deceleration. A memory function allows the last speed reading to be recorded. This function also records the minimum and maximum speeds measured. Coupling to the shaft of a motor is accomplished through a rubber tip attached to the Digital Tachometer. Designed to fit comfortably in either the right or left hand, the tachometer is constructed to withstand years of rugged use.
*The Digital Tachometer is a resale item. Lab-Volt cannot guarantee that the exact same unit will be available at the time of order.
Model 8931 – Speed Sensor / Tachometer
The Speed Sensor / Tachometer, Model 8931, is a speed sensor providing a voltage proportional to speed as well as a tachometer indicating the measured speed on an analog scale. The tachometer makes it possible to measure the rotation speed of rotating machines in any Lab-Volt 0.2-kW Electromechanical Training System (EMS). The speed sensor can be used in any closed-loop control circuit that requires speed feedback to maintain the speed of an EMS machine constant. The Speed Sensor / Tachometer consists of a permanent magnet tacho-generator and an analog speed meter enclosed in a separate steel case. The tachogenerator is housed in an aluminum case which can be fastened to the front panel of any EMS machine. A miniplug cable interconnects the tacho-generator to the speed meter through a mini jack mounted on its front panel. The Speed Sensor / Tachometer can measure speed in both directions and has two speed ranges. Two switches on the front panel of the speed meter allow selection of the direction of rotation and the speed range. A pair of 2-mm banana jacks, also on the front panel, provide a voltage proportional to speed (speed sensor output voltage).
Model 8942 – Timing Belt
The Timing Belt, Model 8942, is an industrial synchro cog rubber timing belt whose teeth exactly mesh the geared pulley fitted on the shaft of all Lab-Volt 0.2-kW EMS machines. This belt is supplied in a fixed length appropriate for coupling two adjacent machines without slippage between them.
Model 8951 – Connection Leads
The Connection Leads, Model 8951, consist of PVCcovered, extra-flexible leads terminated with stacking 4-mm safety banana plugs. The leads are supplied in three or four different lengths, according to model variations, and are color-coded according to length. Certain model variations also include one or several of the following items: 2-mm banana plug leads of three different lengths (also color-coded according to length), a BNC-to-BNC cable, a BNC-to 2-mm banana plug cable, and a lead holder. The lead holder is an adjustable lead storage rack that can be mounted to the side of any EMS Workstation, providing easy access and orderly storage of the leads. Refer to the Specifications section of the Accessories datasheet to find the quantities and lengths of the leads and cables included in each variation of the Connection Leads, Model 8951.
Model 8957 – Fault Insertion Panel
The Fault Insertion Panel, Model 8957, can be installed over the front panel of any Lab-Volt 0.2-kW EMS machine, using two captivated thumb-screws. The panel consists of heavy-gauge steel finished with baked enamel paint and is fitted with nine connection leads equipped with 4-mm safety plugs, terminated on the panel by 4-mm safety jacks. Once this panel is installed, the silkscreened terminal identification is "hidden", and the machine becomes an "unknown machine". Troubleshooting exercises based on a variety of simulated faults can be created, including: reversed windings, open circuits, short circuits, etc. This panel also allows simulation of "industrial" conditions in which the machine is inoperable and the leads are not identified.
