FAQs-GW Instek

Q1

May I use GDS-2000A’s logic analyzer probe to MSO-2000E?

The logic analyzer probe is not universal. Only probe clips are allow to share.

Q2

What is the main difference between MDO-2000A and MDO-2000E series?

Please see below table

	MDO-2000A	MDO-2000E
Bandwidth	300M/200M/100MHz	200M/100M/70MHz
Sampling rate	2GSa/s interleaved	1GSa/s interleaved
Memory depth	20M/CH	10M/CH
Channel	2	2 or 4
25MHz Function generator	Only on MDO-2000AG model	Yes

Q3

What is the main difference between GDS-1000B and GDS-2000E series?

GDS-2000E provided bus decode function; segment memory; waveform search function which not on the GDS-1000B.
For the sampling rate comparison, both series are max. 1GSa/s.For GDS-2000E series ,the max. sampling rate will keep 500MSa/s for 4CH activate and 2CH activate will keep 1GSa/s. However, for GDS-1000B series, the max. sampling rate will reduced to 250MSa/s for 4CH activate and 2CH activate will reduced t0 500MSa/s.

Q4

Why the input square waveform is looks like sine waveform in the oscilloscope.

When the rise time or fall time of square signal is close to the period, the display waveform will looks like sine waveform.
For example, to test 25MHz square waveform.
The rise time is 0.35/25MHz=0.014us. The period is 1/25MHz=0.04us.
Since the rise time is close to the period ,the output waveform will looks like sine waveform.

Q5

How come my digital filter function cannot use?

The digital filter function is not support under Average mode acquisition; ATL trigger; Roll mode; Segmented memory activate and the time base range setup is <=50ns/div.

Q6

How can I set frequency domain waveform display appropriately?

Please see the main frequency value on the frequency counter on the time domain. Then set this value to center frequency of spectrum analyzer function.

Please note following 3 formula to set other parameters to get the appropriate display.

Center frequency=(start frequency +stop frequency)/2
Stop frequency-start frequency=Span
RBW=sample rate /length of FFT

Q7

Why the max. frequency range for spectrum analyzer function is 500MHz, not as same as the max. bandwidth 200MHz?

The max. frequency range for spectrum analyzer function is 1/2 of max. sampling rate which is limited at DSP Nyquist theory.

Q8

Why the frequency counter is not display on the GDS-2000E

Please check the trigger setup. The frequency counter will not display when set on Alternate trigger ;pulse runt trigger and bus trigger.

Q9

What are the test regulations for EN61000-6-4?

The test regulations of EN61000-6-4 are general standards used to define the EMI standard under industrial environments, which is the standard of Class A. Its regulations are the same as those of EN55011A. The regulations for conducted and radiated tests are as follows:

Frequency Range, MHz	QP limits (dBuV)	AVG limits (dBuV)
0.15 ~ 0.5	79	66
0.5 ~ 30	73	60
EN61000-6-4 Conducted test regulations

Frequency Range, MHz	QP limits (dBuV)
30 ~ 230	40
230 ~ 1000	47
EN61000-6-4 Radiated test regulations

Q10

The EN55015 regulation primarily defines the conducted (CE) test for LED luminaires. What are the test regulations for radiated test (RE)?

The radiated (RE) test regulation EN55015 is mainly defined in the test range of 30MHz ~ 300MHz. For different test sites, the defined test regulations will be different. The test regulations of 3m can be set by referring to the test lead of EN55022A. If the test regulation of 10m is adopted, refer to the test lead setting of EN55022B.

Frequency Range, MHz	QP limits (dBuV)	AVG limits (dBuV)
Frequency Range, MHz	3m distance	10m distance
30 ~ 230	40	30
230 ~ 300	47	37

Q11

The measured voltage is 10/100/1000 times larger than the real value.

The probe ratio in the CH1 or CH2 setup menu is set at X10, X100, or X1000. Please refer our user manual for details.

Q12

The measured voltage is 10 times smaller than the real value.

The attenuation ratio on the probe is set at x10. If you switch it to x1, make sure that the input voltage does not surpass the maximum 400V.