Model TOS9000 Automatic W/I Tester has been designed for automatic evaluation of withstanding voltages and insulation resistances of electrical and electronic devices. As used with Model TOS6IOO AC low ohm tester, the TOS9000 allows also to measure low resistances of devices. As a W Teter (withstanding voltage tester), the T0S9000 has a rated output power of 200VA (5kV, 40mA) and a rated transformer power of 500VA, and can be used for withstanding voltage tests (dielectric strength tests) of electrical and electronic devices and parts complying with the major electrical standards and codes, including UL, CSA, BS, and JIS. As an I Tester (insulation resistance tester), the TOS9000 has a test range of 1 - 9999MÉ2 with a test voltage of 50 - 1000V (can be preset as required). [When Model TOS6IOO AC low ohm tester is used with a TOS9000, the TOS9000 controls the TOS6IOO.] You can program the three types of tests (W, I, R) flexibly into a series of test steps. And you can execute the test automatically. The TOS9000 has a fluorescent display screen for 40 characters x 2 lines on the front panel. It provides easy confirming to set test conditions, measured data, and display of machine messages visually. The TOS9000 has a window comparator function for PASS/FAIL decision, an output signal function for fourteen signals, a remote- control function for programmed tests, and a GPIB function for interfacing with a fully automatic computerized system. With these functions the TOS9000 can be used for highly efficient, flexible, labor-saving tests of electrical and electronic devices and parts. The TOS9000 has provisions against noise, therefore its internal circuits operate with a high reliability against noise.