GW Instek GDS-122 Hand Held Digital Oscilloscope


DSO, 20MHz, 100MS/s with USB

Two-In-One Function: Dual Channel Oscilloscope and True RMS DMM
GDS-122 is a multi-function measurement tool. By using the oscilloscope functionalities, you can measure simple waveforms, use advanced measurement functions, and configure system settings. The multimeter functionality includes three major items (Voltage, Current, and Impedance) and three additional items (Diode, Continuity, and Capacitance). The current measurement and capacitance measurement use extension modules to deal with large current and small capacitance, respectively. Delta measurement and automatic range switching features offer flexibility and convenience.

Dual Waveform Math
The waveform math function runs mathematical operations between CH1 and CH2 waveform, and then shows the result in the display. It offers 5 math function, CH1-CH2, CH2-CH1, CH1+CH2, CH1 x CH2, CH1/CH2.

Automatic Measurement
The automatic measurement function measures the input signal’s characteristics and lists them in the top left corner of the display. The measurement items are Frequency, Period, Mean Voltage, Peak-to-Peak Voltage, Cycle Voltage (True RMS).

Autoset Function
The autoset function automatically configures the following parameters according to the input signal. It can offer CH1/CH2 on/off, Vertical scale/level, Horizontal scale/level, Trigger level.

Self Calibration
The self calibration function automatically configures internal parameters to maintain the sensitivity and accuracy.
Run the self calibration in the following cases:
When the temperature changes more than 5 degrees Celsius during operations.
When operating the GDS-122 in a new benchtop or field environment.

6 Hours Running Time Li-ion Battery & Very Light Weight
GDS-122 is equipped with a Li-ion battery, which is able to maintain its normal operation for about 6 hours. After pressing the power key, press any key (for example the MENU key) to enter the oscilloscope or multimeter mode. See the battery level icon at the top left corner of the display and connect the power cord if the level is < 25%. With only 690g light weight and compact size, GDS-122 well fits into outdoor applications.

Free PC Software
The GDS-122 PC software, included in the CD-ROM, allows you to view the waveforms in your familiar PC environment large display and mouse operation. Multiple cursors provide flexible waveform measurements. The PC Software is through from USB connection.

The compact design with the total weight of 690g allows engineers to carry it around easily. The protective cover of the unit is insulated and specially designed to guarantee endurance and reliability in tough environments. The rechargeable Li-ion battery ensures convenience for on-site testing.

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  • 20MHz Bandwidth
  • True RMS Multimeter: Volt, AMp, Ohm, Continuity, Diode
  • 100MS/s Real-Time Sampling Rate
  • USB Interface
  • 6 Hour Capacity Li-ion Rechargeable Battery
  • 3.8″ Color LCD with 320 x 480 Resolution
  • Trigger Mode: Single Shot, Free Run, Edge, Video
  • Light Weight: 690g


Channels 2
Analog Bandwidth 20MHz
Single Bandwidth Full bandwidth
Rise Time 17.5ns
Sensitivity 5mV/div ~ 5V/div at the BNC input
DC Gain Accuracy 5%
DC Measurement Accuracy (5% reading + 0.05div): average sampling
Analog Digital Converter Resolution 8 bits, synchronously sampling on both channels
Displacement Range 50V (500mV ~ 5V), 1V (5mV ~ 200mV)
Low Frequency Response AD Coupling, -3dB 5Hz at the BNC input
Sources CH1, CH2
Trigger Sensitivity 2div, peak-to-peak value
Trigger Sensitivity – Edge Trigger DC coupling: 1div (full bandwidth)
AC coupling: same as the DC coupling (50Hz)
Trigger Level Range 6div from the screen center
Trigger Level Accuracy 0.3div typical
Trigger Displacement 655div (pre-trigger), 4div (post-trigger)
50% Level Setting Input signal 50Hz (typical)
Video Trigger NTSC, PAL, SECAM (any line or frequency)
Sampling Rate 10S/s ~ 100MS/s
Waveform Interpolation sinx/x
Record Length 6k points on each channel
Scan Speed 5ns/div ~ 5s/div, 1-2.5-5 step
Sampling Rate and Relay Time Accuracy 100ppm (1ms)
Time Interval Accuracy (Full Bandwidth) Single: (1 sampling interval time + 100ppm x reading + 0.6ns)
Average >16: (1 sampling interval time + 100ppm x reading + 0.4ns)
Input Coupling DC, AC
Input Impedance 1MΩ 2%, connected in parallel with 20pF3pF
Probe Attenuation Coefficient 1X, 10X, 100X, 1000X
Maximum Input Voltage 400V (peak)
Channel Delay Time 150ps (typical)
Sampling Mode Normal, Peak Detect, Average
Sampling Rate 100MSa/s
Cursor Measurement Voltage difference and Time difference between cursors
Auto Measurement Peak-to-peak, Average, Root mean square, Frequency, Cycle

Multimeter Specifications

Input Impedance 10MΩ
Voltage VDC: 400mV, 4V, 400V (1% + 1digit)
VDC: 4V, 40V, 400V (1% + 3digits)
Maximum Input Voltage DC 400V, AC 400V (virtual value)
Frequency 40Hz ~ 400Hz
DC Current 40mA, 400mA (1.5% + 1digit), 20A (3% + 3digits)
AC Current 40mA (1.5% + 3digits), 400mA (2% + 1digit), 20A (5% + 3digits)
Impedance 400Ω (1% + 3digits), 4kΩ, 40kΩ, 400kΩ, 4MΩ (1% + 1digit), 40MΩ (1.5% + 3digits)
Capacitance 51.2nF ~ 100uF (3% + 3digits)
Diode 0V ~ 1.5V on/off measurement < 50Ω (30Ω) beep

General Specifications

Display Type 3.8″ color liquid crystal display
Display Resolution 320 (horizontal) x 240 (vertical) pixels
Display Color 4096 colors
Power Supply 100 ~ 240VAC, 50Hz, CATII
Power Consumption <6W
Operating Temperature Battery Operation: 0 ~ 50 (32 ~ 122F)
Power adaptor operation: 0 ~ 40 (32 ~ 104F)
Dimensions 180 x 115 x 40 mm
Weight 0.69kg


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