| Model | GDS-820 | GDS-820S | GDS-820C | GDS-840S | GDS-840C |
| Display System |
| Display Device | Mono (320*240) 5.7" LCD | Mono (320*240) 5.7" LCD | Color (320*240) 5.7" LCD | Mono (320*240) 5.7" LCD | Color (320*240) 5.7" LCD |
| Display Contrast | Adjustable |
| Waveform Display Graticule | 8 x 10 division |
| Display Mode | Dot, Vector, Accumulate |
| Vertical System |
| Bandwidth | DC~150MHz | DC~250MHz |
| Channels | 2 |
| Resolution | 8-Bit |
| Sensitivity | 2mV/div to 5V/div |
| Accuracy | ±3? |
| Rise Time | <2.3ns | <1.4ns |
| Input Coupling | AC, DC & Ground |
| Input Impedance | 1MΩ ±2Ω, ~22pF |
| Polarity | Normal & Invert |
| Maximum Voltage Between Signal and Common at input BNC | 300V (DC+AC peak), CATII |
| Waveform Signal Process | CH1-CH2, CH1+CH2, FFT |
| Offset Range | 2mV/div ~ 50mV/div: ±0.5V ; 100mV/div ~ 500mV/div: ±5V ; 1V/div ~ 5V/div: ±50V |
| Bandwidth Limit | 20MHz (-3dB) |
| Horizontal System |
| Range | 1ns/div ~ 10s/div (1-2-5 increments) |
| Modes | MAIN, WINDOW, WINDOW ZOOM, ROLL, X-Y |
| Accuracy | ±0.01? |
| Delay Range | Pre-trigger: 10 div maximum ; Post-trigger: 500 div |
| Signal Acquisition System |
| Real-time Sample Rate | 100MSa/s maximum on each channel |
| Equivalent Sample Rate | 25GSa/s maximum on each channel |
| Record Length | 125k/CH |
| Peak Detection | 10ns (10μs/div ~ 5s/div) |
| Acquisition Mode | Sample, Peak Detect, Average |
| Average | 2, 4, 8, 16, 32, 64, 128, 256 |
| Trigger System |
| Sources | CH1, CH2, LINE, EXT. |
| Modes | Auto-Level,AUTO,NORMAL,SINGLE,TV,Time-delay,Event-delay |
| Coupling | AC, DC, LF Reject, HF Reject, Noise Reject |
| Sensitivity | DC ~ 25MHz: Approx. 0.35div or 3.5mV
25MHz ~ 100MH : Approx. 1.5div or 10mV | DC ~ 25MHz: Approx. 0.35div or 3.5mV |
| 25MHz ~ 250MHz | Approx. 1.5div or 10mV |
| External Trigger |
| Range | ±15V |
| Sensitivity | DC ~ 30MHz: ~ 50mV
30MHz ~ 100MHz: ~ 100mV | DC ~ 30MHz: ~ 50mV
30MHz ~ 100MHz: ~ 100mV
150MHz ~ 250MHz: ~ 150mV |
| Input Impedance | 1MΩ ±2Ω, ~ 22pF |
| Maximum Input | 300V (DC+AC peak), CATII |
| X-Y Mode |
| X-Axis Input / Y-Axis Input | Channel 1 / Channel 2 |
| Phase shift | ±3°at 100kHz |
| Cursors and Measurement |
| Automated Voltage Measurement | Vpp,Vamp,Vavg,Vrms,Vhi,Vlo,Vmax,Vmin |
| Automated Time Measurement | Freq, Period, Rise Time, Fall Time, Positive Width, Negative Width, Duty Cycle |
| Cursors Measurement | Voltage difference between cursors (?V)
Time difference between cursors (?T)
Frequency difference between cursors (1/?T) |
| Frequency Counter |
| Readout Resolution | 6 digits |
| Accuracy | ±50ppm |
| Range | AC Coupled, 10Hz minimum to rated bandwidth |
| Signal Source | All available trigger source except the Pulse Width & Video Trigger mode |
| Control Panel Functions |
| Autoset | "Autoset" can adjust Vertical, Horizontal and Trigger level automatically |
| Save/Recall | Up to 15 sets of measurement conditions can be saved and recalled |
| Waveform Trace Save/Recall | 2 sets of waveform can be saved and recalled |
| Interface |
| RS-232 Interface | N/A | Standard |
| GPIB Interface | N/A | Option |
| Printer Port | N/A | Standard |
| USB Port | N/A | Standard |
| Misc |
| Power Source | 100V ~ 240V AC 48Hz ~ 63Hz, auto selection |
| Accessories | Instruction manual x 1, Power cord x 1, Probe x 2 |
| Dimensions & Weight | 254D?142H?310W (mm), Approx. 4.1kg |