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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 1M£[ + 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: ¡Ó0.5V ; 100mV/div ~ 500mV/div: ¡Ó5V ; 1V/div ~ 5V/div: ¡Ó50V 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 1M£[ + 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¡ã 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 (£GV) time difference between cursors (£GT) Frequency difference between cursors (1/£GT) 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