Model Number

MOS-620B/640B

Specification

VERTICAL AXIS Sensitivity: 5mV~20V/DIV,12 steps in 1-2-5 sequence (X5 MAG: 1mV/DIV) Sensitivity accuracy: ≤ 3% （ × 5 MAG: ≤ 5% ） Vernier vertical sensitivity: Continuously variable to 1/2.5 or less of panel-indicated value Frequency Bandwidth: DC~20MHz ( × 5MAG:DC~7MHz) / DC~40MHz (X5MAG: DC~15MHz) AC coupling: Low limit frequency 10Hz. (With reference to 100KHz, 8DIV. Frequency response with-3dB.) Rise time:Approx.17.5nS( × 5MAG:Approx.50nS) / Approx. 9.5nS (X5MAG: Approx. 25nS) Input impedance:Approx.1M Ω /Approx.25pF Square wave characteristics: Overshoot: ≤ 5%(At 10mV/DIV range); Other distortions and other ranges:5% added to the above value DC balance shift: 5mV~5V/DIV; ±0.5DIV, 1mV~2mV/DIV±2.0DIV Linearity: ≤± 0.1DIV of amplitude change when waveform of 2DIV at graticule center is moved vertically Vertical modes: CH1: CH2 single channel; DUAL: CH1 and CH2 are displayed simultaneously. ALT or CHOP selectable at any sweep rate; ADD: CH1+CH2 algebraic addition Chopping repetition frequency: Approx.250KHz Input coupling: AC, GND , DC Maximum input voltage: 300Vpeak (AC: frequency 1KHz or lower);When set probe switch at 1:1, the maximum effective readout is 40Vp p(14Vrms at sine wave); or set probe switch at 10:1, the maximum effective readout is 400Vpp(140Vrms at sine wave). Common mode rejection ratio: 50:1 or better at 50KHz sinusoidal wave. (When sensitivities of CH1 and CH2 are aet equally) Isolation between channels(At 5mV/DIV range): ＞ 1000:1 at 50KHz; ＞ 30:1 at 20MHz/ ＞ 30:1 at 40MHz CH1 signal output: At least 20mV/DIV into a 50 Ω termination. Bandwidth is 50Hz to at least 5MHz CH2 INV BAL: Balanced point variation: ≤ 2DIV(Reference at center graticule) TRIGGERING Triggering source: CH1, CH2, LINE, EXT Coupling: AC:20Hz to full bandwidth Slope: +/- Sensitivity: 20Hz~2MHz:0.5DIV, TRIG-ALT:2DIV, EXT:200mV; 2~2MHz:1.5DIV; 20MHz~40MHz: 2DIV, TRIG-ALT:3DIV, EXT:800mV; TV: Sync pulse more than 1DIV (EXT:1V) Triggering modes: AUTO; NORM ; TV-V ; TV-H; (Both TV-V and TV-H synchronize only when the synchronizing signal is negative) EXT triggering signal input: Input impedance: Approx:1M Ω /approx.25pF Max. input voltage: 300V(DC+AC peak), AC: Frequency not higher than 1KHz HORIZIONTAL AXIS Sweep time: 0.2 μ Sec~0.5Sec/DIV, 20steps in 1-2-5 sequence; Sweep time accuracy: ± 3%; Vernier sweep time control: ≤ 1/2.5 of panel-indicated value; Sweep magnification: 10 times; × 10MAG sweep time accuracy: ±5 %(20nSec~50nSec are uncalibrated); Linearity: ± 3%, × 10MAG: ±5 %(20nSec~50nSec are uncalibrated); Position shift caused by × 10MAG: Within 2DIV. at CRT screen center X-Y MODE: Sensitivity: Same as vertical axis. (X-axis: CH1 input signal;Y-axis:CH2 input signal.); Frequency bandwidth: DC to at least 500KHz; X-Y phase difference: ≤ 3°at DC-50KHz Z AXIS Sensitivity: 5Vp-p (Positive-going signal decreases intensity); Frequency bandwidth: DC~2MHz; Input resistance: Approx.47K Ω ; Maximum input voltage:3V(DC+AC peak, AC frequency ≤ 1KHz) CALIBRATION VOLTAGE Waveform: Positive-going square wave; Frequency: Approx.1KHz; Duty ratio: Within 48:52; Output voltage: 2Vp-p ± 2%; CRT Type: 6-inch rectangular type, internal graticule; Phosphor:P31; Acceleration voltage: Approx.2KV(20MHz) / Approxl12KV (40MHz); Effective screen size: 8 × 10DIV (1DIV=10mm(0.39in); Trace rotation: Provided   NOTE ： 20MHz/40MHz Dual Channel High Sensitivity 1mV/DIV Z Axis Input CH1 Output 10 times sweep magnification TV Synchronization, X-Y mode High luminance, internal graticule Encoder for Sweep and Vert mode switch ALT Triggering Function, simultaneous observation of two independant signalls Triggering Level Lock Function Buit in 1000:1 attenuator expanded vertical sensitivity to 10V~20V/DIV