RIGOL Oscilloscope Use

1. Does the DG series have a power output function?
No, it can achieve 10W power output when equipped with PA1011.
2. Why does the output not change when the output impedance is switched between high impedance and 50 ohms?
This is because the physical output impedance of the signal source is fixed to 50 ohms, and the output impedance condition is only adjusted by software to adjust the output value of the signal source.
First, when the output impedance is switched, the amplitude setting of the signal will change accordingly, such as: 1KHz, 2Vpp square wave, the output impedance is high impedance, then we switch to 50 ohms, and then we look at the settings again, it has become 1KHz, 1Vpp square wave. However, we still set the oscilloscope input impedance to high impedance to observe this signal, then the measured result is still 1KHz, 2Vpp square wave, this is because the input impedance of the oscilloscope does not match the output impedance of the signal source.
At this time, we need to adjust the input impedance of the oscilloscope to 50 ohms, so that the measured result is correct, which is 1KHz, 1Vpp square wave.
3. What should I do if the DG output is inaccurate after using it for a period of time?
First, you need to determine whether the instrument is faulty. If it is only the accuracy of the output value and there are no other functional problems, you can return it to the factory for calibration. Otherwise, it needs to be repaired.
4. What is an RS-232 crossover cable and what is an RS-232 straight-through cable?
There are two types of RS-232 crossover cables: 2-wire crossover means that the 2nd and 3rd wires are crossed at the 2nd end of the RS-232 connection cable; 3-wire crossover means that the 2nd, 3rd, and 5 wires are crossed at the 2nd end of the RS-232 connection cable. RS-232 straight-through cables directly connect different types of devices through standard connectors. All RIGOL devices use straight-through cables except DM3058, which uses a crossover cable.
5. Can the DG hardware frequency meter be set to high-frequency suppression?
Yes. High-frequency suppression can be used to suppress the triggering of high-frequency components when measuring low-frequency signals to reduce false triggering. The "HFR On" or "HFR Off" displayed in the soft key menu is the current high-frequency suppression state. Each time the soft key is pressed, the high-frequency suppression state is switched once.
6. Why can't the 300-point arbitrary wave edited by RIGOL's host computer software be recognized when it is transferred to the signal source using a USB flash drive, but can be edited in the machine?
When using software to edit arbitrary waves, you need to pay attention to one point: the selected points must be edited completely, and no blank points can be left, otherwise the machine cannot recognize these data points and the waveform cannot be sent out. When using the instrument to edit, because the default value of the unedited points is 0, it can be sent out.
7. How to use the signal source to send a signal with a Vpp below 2mV or above 10V?
The current output range of the RIGOL signal source is 2mVpp-10Vpp (50 ohms), and accessories can be used to achieve signal output of other amplitudes.
If a small amplitude signal is output, a 40dB attenuator can be used to attenuate the output signal by 100 times; if a large amplitude signal is output, a PA1011 power amplifier can be used to amplify the output signal amplitude by 10 times.
8. Why does it take a long time to get a reading when measuring capacitance?
This is determined by the principle of capacitance measurement. Capacitance measurement is to charge the capacitor and measure the charging time. The larger the capacitance value, the longer the measurement time.
9. What is the difference between AC effective value and RMS value?
RMS value is also called effective value. It is calculated by squaring, averaging, and then taking the square root. When AC and DC pass through resistors of the same resistance value, if they generate the same amount of heat in the same period of time (one cycle), the value of the DC is called the effective value of the AC.
10. What is the principle of short circuit test?
Short circuit test actually measures the resistance value of the circuit, and sends out an alarm after comparing the resistance value with the preset value. Short circuit test is also called continuity test. The resistance range of short circuit resistance is 1Ω to 2000Ω. The factory default value of short circuit resistance is 10Ω. The short circuit resistance value is stored in non-volatile memory, and the resistance value remains unchanged after power failure.
11. What is the protection of each DM input terminal?
1. Main input (HI and LO) terminals. HI to LO protection limit. The HI to LO protection limit is 1000 VDC or 750 VAC, which is also the maximum voltage that can be measured. 2. Sampling (HI Sense and LO Sense) terminals. The HI Sense and LO Sense terminals are used for four-wire resistance test measurements.
The following two protection limits are defined for these two terminals:
1) HI Sense to LO Sense protection limit. The HI Sense and LO Sense protection limits are 200Vpk.
2) LO Sense to LO protection limit. The LO Sense and LO protection limits are 2Vpk.
3. Current input (I) terminals. The I and LO terminals are used for current test measurements. The rear panel fuse provides a maximum 10A protection limit for the current flowing through the I terminal.
12. Why are the test results of the multimeter's automatic and manual ranges inconsistent?
When using the multimeter, when measuring in the automatic range, the multimeter will automatically select the appropriate range based on the measured value and the built-in jump value of the machine. When manually selecting the range, if the selected range is different from the machine selection, there will be certain differences due to different selections of standard values, etc. Under the same gear, there is no physical difference between the test results of automatic measurement and manual gear setting measurement.
13. Why is the resistance of the running circuit inaccurate when using a multimeter?
When the multimeter tests the resistance, it discharges the measured resistance through a constant current source. In the running circuit, the current has already flowed through the resistance, which will greatly affect the measurement accuracy and may even burn the multimeter. Therefore, when using the ohm gear to detect circuit components or circuit systems, the power supply of the measured device or system must be cut off first. If the measured object contains a capacitor with a large storage capacity, it must also be discharged in an appropriate way. Only after confirming that there is no power supply factor in the measured part can the measurement be carried out. Otherwise, not only will the test result be inaccurate, but the multimeter will also be easily damaged.
14. How is the reading resolution of the multimeter defined? Why is DM3058 a true five-and-a-half-digit device? What is the significance?
The reading resolution (Digit resolution) of the multimeter is a physical quantity that standardizes the number of display digits. The display digits are divided into complete display digits and incomplete display digits.
Complete display digits: digits that can fully display 0-9.
Incomplete display digits: cannot fully display the numbers from 0 to 9, that is, from 0, the upper limit cannot reach 9, which is often in the high digits of the reading. For example, the reading resolution of DM3054 is 5 3/4 digits, and its complete display digits are 5 digits, and the highest can only be displayed to 3, a total of (0-3) 4 numbers (3/4 half digits come from this, and the complete is 10/10, that is, 1).
Advantages: DM3058 can display 240,000-count, so it is a true five-and-a-half digit (20% range expansion). Compared with other products with counts of 120,000 or 200,000, it can test larger signals with the same gear accuracy. For example: when measuring a 2.1V voltage, DM3058 only needs to use the 2V range, while products that display 120000 and 200000 need to use a higher range, which increases the error.
15. When DM3058 measures DC current, it can display a minimum of 1nA. Does this mean that the multimeter can accurately measure 1nA? How to explain this?
No. Resolution and accuracy are different concepts. At the minimum range, the last digit of the multimeter, that is, the minimum displayed order of magnitude, is its minimum resolution, which is a reference value. Its accuracy should be calculated as follows: DC current accuracy 0.020% reading + 0.005% range.
16. Is the number of displayed digits fixed to 7 when using DM3058 for testing?
The number of displayed digits of DM3058 is related to the test speed and the selected function. When slow speed is selected, it corresponds to 5.5 digits, medium speed and fast speed correspond to 4.5 digits, sensor is fixed at 5.5 digits, diode and continuity test are fixed at 4.5 digits, frequency is fixed at 5.5 digits, and capacitance is fixed at 3.5 digits.
17. The concept of triggering
In order to synchronize the scanning signal with the measured signal, some conditions are set, and the measured signal is continuously compared with these conditions until the measured signal meets these conditions before starting the scan, so that the scanning frequency is the same as the measured signal or there is an integer multiple relationship. We call this technology "triggering", and these conditions are called "triggering conditions".

The triggering modes include automatic triggering, normal triggering, single triggering, etc.

There are many forms of trigger modes. The most commonly used and basic one is edge trigger. There are also pulse width trigger, slope trigger, video trigger and alternating trigger. In digital signals, there are pattern trigger and duration trigger.
18. What are the functions of the commonly used interfaces of oscilloscopes?
USB Host interface: corresponds to the master device in the USB master-slave connection, supports U disk storage, file management and direct printing of USB interface printers, and supports U disk upgrade of the machine;