Twintex TOS-2020CH Laboratory Dual Channel CRO Analog Oscilloscope 20MHz for Students

Model

20MHz

40MHz

50MHz

Vertical system

Sensitivity

5mV~5V/DIV, 10 steps in 1-2-5 sequence

Accuracy

≤3%

Vernier sensitivity

≤1/2.5 of panel indicated value

Bandwidth

DC (AC 10Hz)~20MHz

DC (AC 10Hz)~40MHz

DC (AC 10Hz)~50MHz

AC coupling

<10Hz (at 100kHz, 8DIV, frequency response -3dB)

Rise time

Approx. 17.5ns

Approx. 8.75ns

Approx. 7ns

Input impedance

Approx. 1MΩ//Approx. 25pF

DC balance shift

5mV~5V/DIV: ±0.5DIV

Vertical mode

CH1, CH2, DUAL (ALT/CHOP), ADD, CH2 INV

Chopping repetition frequency

Approx. 250kHz

Input coupling

AC, GND, DC

Max. Input voltage

400V peak-peak, AC frequency≤1kHz

Common mode rejection ratio

>50:1 at 50kHz sine wave (set CH1 and CH2 at same sensitivity)

CH2 INV BAL

Balanced point variation≤1DIV (referred to graticule center)

Horizontal system

Sweep time

0.2us~0.5s/DIV, 20 steps in 1-2-5 sequence

Accuracy

±3%, X10MAG: ±5% (20ns~50ns/DIV uncalibrated)

Vernier sweep time control

≤1/2.5 of panel indicated value

Sweep magnification

X10 (fastest sweep time 20ns/DIV)

Position shift@X10MAG

≤2DIV at CRT screen center

Linearity

±5%, X10MAG: ±10% (0.2s~1us)

Trigger system

Trigger mode

AUTO, NORM, TV-V, TV-H

Trigger level lock

Not provided

Trigger source

CH1, CH2, ALT, LINE, EXT

Trigger coupling

AC: 20Hz to full bandwidth

Trigger slope

“+” or “-”

Sensitivity

Frequency

20Hz~2MHz

2MHz~20MHz

20MHz~40MHz

40MHz~50MHz

CH1, CH2

1DIV

1.5DIV

2.5DIV

3DIV

ALT

2DIV

3DIV

EXT

200mV

800mV

TV

Sync pulse>1DIV (EXT: 1V)

External trigger input

Input impedance

Approx. 1MΩ//Approx. 25pF

Max. input voltage

400V (DC+AC peak), AC frequency≤1kHz

X-Y mode

Sensitivity

5mV~5V/DIV±3%

X-axis bandwidth

DC~500kHz (-3dB)

Phase error

≤3° at DC~50kHz

Frequency counter (only for TOS-2020CF, TOS-2040CF, TOS-2050CF)

Display

6 digits LED

Accuracy

±0.01%

Component test (only for TOS-2020CT, TOS-2040CT, TOS-2050CT)

Testing subject

Resistor, Capacitor, Coil, Diode, Zener or simple combination of the components

Testing voltage

Approx. 9Vac pp

Testing frequency

50/60Hz

Testing current

Approx. 0.6mA