Instek GDS-820/840 Series Digital Storage Oscilloscope   GDS-820/840 Series    FEATURES 150MHz/250MHz Bandwidth with either Color or Monochrome LCD Display 125k Long Memory and 12 Division Horizontal Display 25Gsa/s Sampling Rate for Repetitive Waveforms  15 Auto Measurement Functions to get quick and accurate results Advance Trigger: Pulse Width, TV-Line, Event Delay and Time Delay GO-No Go, Learn Mode and Auto Setup Sequence FFT Function Standard Interface: USB, RS232, Printer Port, Option: GPIB Interface    Downloadable Data Sheet         SPECIFICATIONS           Display System         Display Device GDS-820 GDS-820S GDS-820C GDS-840S GDS-840C 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 divisions (8 x 12 div, when menu off)       Display Mode Dot, Vector, Accumulate       Vertical System         Bandwidth (-3dB) GDS-820 GDS-820S GDS-820C GDS-840S GDS-840C DC~150MHz DC~150MHz DC~150MHz DC~250MHz DC~250MHz       Channels 2       Resolution 8 bit       Sensitivity 2mV / DIV ~ 5V / DIV       Accuracy +3%       Rise Time GDS-820 GDS-820S GDS-820C GDS-840S GDS-840C <2.3ns <2.3ns <2.3ns <1.4ns <1.4ns       Input Coupling AC, DC, GND       Input Impedance 1MΩ + 2%, ~ 22pF       Polarity Positive& Negative       Maximum Voltage Between          Signal and Common at input       BNC 300V (DC + AC peak), CAT II       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 ; Roll: 250mS/DIV ~ 10S/DIV (1-2-5 increments)       Modes MAIN, WINDOW, WINDOW ZOOM, ROLL, X-Y       Accuracy +0.01%       Delay Range Pre-trigger : 20 DIV, Post-trigger : 1000 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 (500nS/DIV ~ 10S/DIV)       Acquisition Mode Sample, Peak Detect, Average       Average 2, 4, 8, 16, 32, 64, 128, 256       Trigger System         Source CH1, CH2, LINE, EXT       Modes AUTO-LEVEL, AUTO, NORMAL, SINGLE, TV, TIME DELAY, /EVENT DELAY, EDGE, PULSE WIDTH       Coupling AC, DC, LF rej, HF rej, Noise rej       Sensitivity GDS-820 GDS-820S GDS-820C GDS-840S GDS-840C DC ~ 25MHz : approx. 0.35 DIV or 3.5mV ; 25MHz ~ 100MHz : approx. 1.5 DIV or 15mV DC ~ 25MHz : approx. 0.35 DIV or 3.5mV ; 25MHz ~ 250MHz : approx. 1.5 DIV or 10mV       External Trigger         Range +15V       Sensitivity GDS-820 GDS-820S GDS-820C GDS-840S GDS-840C DC ~ 30MHz : approx. 50mV ; 30MHz ~ 100MHz : approx. 100mV DC ~ 30MHz : approx. 50mV ; 30MHz ~ 100MHz : approx. 100mV; 150MHz 100MHz ~ 250MHz : approx. 150mV       Input Impedance 1MΩ + 2%, ~ 22pF       Maximum Input 300V (DC + AC peak), CAT II       X-Y Mode         X-Axis Input / Y-Axis Input Channel 1 (CH1) / Channel 2 (CH2)       Phase Shift +3° at 100kHz       Cursor & Measurement         Automated Voltage         Measurement Vhi, Vlo, Vmax, Vmin, Vpp, Vavg, Vrms, Vamp       Automated Time       Measurement Rise Time, Fall Time, Duty Cycle, Frequency, Period, Positive Width, Negative Width       Cursor Measurement Voltage difference between cursors (ΔV) time difference between cursors (ΔT) Frequency difference between cursors (1/ΔT)       Frequency Counter         Readout Resolution 6 digits       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" adjust vertical (volt/DIV), horizontal (sec/DIV), 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           USB Interface GDS-820 GDS-820S GDS-820C GDS-840S GDS-840C NA STD. STD. STD. STD.       RS-232 Interface NA STD. STD. STD. STD.       Printer port NA STD. STD. STD. STD.       Go-No Go Output NA STD. STD. STD. STD.       GPIB Interface NA OPT. OPT. OPT. OPT.       Power Source           Line Voltage Range 100V ~ 240V AC, automatic selection       Line Frequency 48Hz ~ 63Hz       Power Consumption 85Watts, 95VA maximum, with fan       Accessories Power cord x 1 ; Instruction manual x 1 ; GDS-820 Series: GTP-150A Probes(10:1/1:1) x 2 GDS-840 Series: GTP-250A Probes(10:1/1:1) x 2       Dimensions & Weight 254(W) x 142(H) x 310(D) mm, Approx. 4.1kg