... -line UPS, off-line UPS, interactive UPS, EPS, sine wave inverter.YB1602 YB1605 YB1610 YB1615 YB1620 · Digital Frequency counter · Linear ... Frequency Function · External FM VCF Input · TTL/CMOS Output · Sine, Square,Triangle, Ramp, Pulse · 2 LED display Volt. & ... digits for voltage)Frequency and width displayed simultaneouslyOutput waveforms: sine, square, triangleFrequency of output signal: 0.2Hz - ...