B+K Precision 20 MHZ Oscilloscope 1520

The B+K Precision 1520 is a 20 MHz dual-channel analog oscilloscope engineered for signal observation in educational and laboratory environments. It delivers DC to 20 MHz bandwidth with dual vertical inputs for simultaneous two-waveform display, independent sensitivity and positioning controls, and both chop and alternate sweep modes. The instrument supports waveform addition and subtraction, X-Y mode operation with Channel B serving as horizontal input, and includes a built-in sync separator for composite video analysis plus vectorscope functionality for color circuit measurements.

Technical Specifications

Vertical Amplifiers (Channels A & B)

• Deflection Factor: 5 mV/cm to 20 V/cm in 12 ranges with vernier adjustment; ±5% accuracy


• Bandwidth: DC to 20 MHz (-3 dB); AC 2 Hz to 20 MHz (-3 dB)


• Risetime: ≤17.5 nanoseconds


• Overshoot: ≤3% at 70 kHz


• Input Impedance: 1 MΩ ±2%, shunted by 27 pF ±3 pF


• Maximum Input: 300 V DC + AC peak or 600 V P-P


• Channel Separation: >70 dB @ 1 kHz Sweep System


• Sweep Time: 0.5 µS/cm to 0.5 S/cm (±5%) in 19 ranges; X10 magnification available (±5%)


• Trigger Sources: CH A, CH B, LINE, or EXT


• Trigger Modes: Normal and automatic with continuously variable positive/negative level control


• CHOP Mode: 200 kHz ±20% operation Horizontal System (X-Y Mode)


• Sensitivity: 5 mV/cm to 20 V/cm with ±5% accuracy


• Bandwidth: DC to 2 MHz (-3 dB); AC 2 Hz to 2 MHz (-3 dB)


• Input Impedance: 1 MΩ ±2%, shunted by 27 pF ±3 pF


• Maximum Input: 300 V DC + AC peak or 600 V P-P Display


• CRT: 130 mm (5-inch) with P31 blue phosphor; 2 kV acceleration voltage


• Graticule: 8 × 10 divisions (1 cm per division)


• Illumination: Variable

Key Features

• Dual-trace operation with chop and alternate sweep modes


• Add/subtract waveform combination capability


• Built-in sync separator for composite video applications


• Vectorscope mode for color analysis


• X-Y mode with matched horizontal/vertical sensitivity

Typical Applications

• Educational laboratory testing and signal observation


• Composite video waveform analysis


• Color circuit vectorscope measurements


• General two-channel signal comparison and analysis