The system total rise time (Scope + probe) can be done with this formula: T_r SYSTEM² = T_r PROBE² + T_r SCOPE², and also can drive the responded bandwidth by T_r =0.35/BW. On the other words, the measurement bandwidth is not only effected by the scope but also be limited by the probe. Basically, if customer want fully use all the bandwidth of the scope, the probe bandwidth should always equal or exceed the bandwidth of the scope. Using a probe of lesser bandwidth will limit the oscilloscope to less than its full measurement capability.

Difference types of probes with different attenuation could result big difference of rise time. As you can see the following probes specification, The rise time for all our probes is 58ns for X1 probe attenuation, but value change from 1.4ns to 5.8ns for X10 probe attenuation for different probe. This could bring the result as customer’s claim.

The available interface depends on the model of GDS series.

• For GDS1000-U/GDS1000A-U, USB is the only interface for remote control.
• For GDS2000A series, USB port and RS-232C are standard interface but GPIB/Lan is optional.
• For GDS3000 series, USB port, RS-232C, and Lan port are standard interface but GPIBis optional.

All the GW digital oscilloscope provides a reference square signal with 2Volts amplitude at 1kHz. You can hook the probe on reference signal and press “AutoSet” button, the oscilloscope will auto detect the signal and display the signal on the screen with the best scale on time and amplitude.

If workable as previous operation, Re-connect your signal again and try “Autoset” button again. If you still not get your signal, Please contact GW Instek local distributor for further assistance.

When the sweep speed is too slow, the oscilloscope will enter to “Roll Mode” and you should see the horizontal line (waveform) movies form right to left gradually. In the roll mode, the waveform data will display immediately without waiting for complete waveform record. For GDS-1000-U series, if the sweep time is large and equal 250ms (≥250ms/div), the scope will switch roll mode automatically.

For example, if sweep was 10 divisions with a rate of one second per division. In “Main Mode”, It would take 10 seconds to fill the waveform record. But using “Roll mode”, the oscilloscope will immediately begin displaying result rather than the full 10 seconds. This mode is very useful to see the information for low frequency waveform.

No, the USB port in the GDS-1000A-U and GDS-1000-U is a device port and can’t support such configuration.

The frequency range basically will base on the bandwidth of oscilloscope, but the high frequency will be attenuated by the amplifier in oscilloscope.

Even though the scope can do FFT like spectrum, but GDS can do each peak search as the way of spectrum’ operation.
Users can change the “Source” to “MATH”, then use “Variable” knob the search each peak values.

Basically different voltage scale will cause different measurement tolerance. For GDS-1000-U series scope, the accuracy is based on following formula and you can find it on GW specification. Vertical accuracy= ±(3% x |Readout|+0.1div+1mV) . Following is an example to explain the different scale for difference measurement accuracy.

For example:

Case 1: Input signal: 1.8V , Vertical scale: 500mV/div
  Vertical accuracy = ±(0.03 x 1.8V + 50mV + 1mV) =± 0.105V

Case 2: Input signal: 1.8V , Vertical scale:50mV/div
  Vertical accuracy = ±(0.03 x 1.8V +5mV +1mV) = ±0.06V

1, Scope and DVM can’t be activated at the same time.
2, Yes, GDS-122 provides two ways for you make measurement. One is “auto measurement”  and the other one is “cursor measurement”, both of them can be used to make frequency, voltage and time measurement.

For more detail reference, you can visit GW web-site to download the user manual and go to the detail instruction.

All the GDS series scope provide “self-calibration” function for customer self-checking and adjustment firstly. Before doing this, we suggest the environment must under following situation for the stability.

1,The calibration should be performed under room temperature 26 ± 5 ºC, and humidity should be less than RH 80%.

2,The instrument should be power on for at least 30 minute warm before performing calibration.

Furthermore, if the accuracy is still out of spec after “self-calibation”, Please call GW’s local sale-representative or channel for further help.

Yes. GW GLA series is PC based logic analyzer which provides up to 32 channels, 32 Mbits of data memory (GLA-1032), a 200 MHz sampling rate and advanced trigger settings for different applications. Customer can to the following web to download and check the more detail information.

Also ,GDS-2000A series are available to option 8 or 16 channel logic analyzer.

GDS-1000-U series support USB slave interface and compatible with 1.1 & 2.0 versions. The maximum speed only reaches up to 12Mb/s (USB 1.1 Full-speed/ USB 2.0 Full-speed).