Specifications: • Frequency range: 0.15 to 500MHz. • Center frequency display accuracy: ±100KHz. • Maker accuracy: 0.1% span + 100KHz. • Resolution of frequency display: 100KHz (4.5 digit LED). • Frequency scanwidth accuracy: ±10%. • Frequency stability: Better than 150KHz / hour. • IF bandwidth (-3dB): 400KHz and 20KHz. • Video-Filter (on): 4KHz. • Sweep rate: 43Hz. • Amplitude range: -100dBm to +13dBm. • Screen display range: 80dB (10dB / DIV.) • Reference level: -27dBm to + 13dBm (in 10dB steps). • Reference level accuracy: ±2dB. • Average noise level: -90dB (20KHz bandwidth). • Distortion: < -55dBc of 2nd and 3rd harmonic. • Third order intermod: -70dBc (two signals > 3MHz apart). • Sensitivity: Better than - 90dBm. • Log scale fidelity: ±2dB (without attn.) 250MHz. • Input attenuator: 0 to 40dB (4 x 10dB steps). • Input attenuator accuracy: ±1dB / 10dB. • Max. input level: +10dBm, ±25V DC (0dB attn.), +20dBm (40dB attn.) • Frequency scanwich: 100KHz / div. to 50MHz / div. in 1-2-5 steps and 0Hz / div. (zero scan).