Hantek 6022BE User manual

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Hantek 6022BE Oscilloscope
Unofficial
Open6022BE User Manual
Software written by Richard Krupski
Manual compiled by André le Roux

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Contents
1. This Manual:.................................................................................................... 7
2. General Safety:................................................................................................ 7
3. Overview:........................................................................................................ 8
4. PC System Requirements: ................................................................................ 8
5. General Features ............................................................................................. 9
6. General Check: ................................................................................................ 9
7. Accessories:.....................................................................................................9
8. Connections and Indications: ......................................................................... 10
9. Installing Hantek6022BE Software: ................................................................ 11
10. Driver Installation:......................................................................................... 12
11. Installing OPEN6022BE Software:................................................................... 15
12. Probe Compensation Adjustment: ................................................................. 15
13. Functional Check: .......................................................................................... 16
14. Self-Calibration:............................................................................................. 17
15. Limitations and things to be aware of: ........................................................... 17
16. Demo Mode .................................................................................................. 21
17. GPS Function (used presently for lack of a better name)................................. 22
18. Waveform Context Area ................................................................................ 22
19. Toolbar menu items....................................................................................... 23
1) File.................................................................................................................................. 23
a) Import......................................................................................................................... 23
b) Export......................................................................................................................... 23
c) Print............................................................................................................................ 23
d) Exit.............................................................................................................................. 23
2) View................................................................................................................................ 23
a) Toolbar ....................................................................................................................... 23
b) Controls...................................................................................................................... 23
c) Measure ..................................................................................................................... 23
d) Measure output ......................................................................................................... 23
e) Debug Information..................................................................................................... 23
f) Full Screen.................................................................................................................. 23
3) Channel .......................................................................................................................... 23
a) CH1............................................................................................................................. 23
b) CH2............................................................................................................................. 24
c) Math........................................................................................................................... 24
d) Reference ................................................................................................................... 25
4) Trigger ............................................................................................................................ 26
a) Mode.......................................................................................................................... 26

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b) Sweep......................................................................................................................... 26
c) Source......................................................................................................................... 26
d) Slope........................................................................................................................... 26
5) Horizontal....................................................................................................................... 26
a) Time/Div..................................................................................................................... 26
b) Format........................................................................................................................ 27
6) Cursor............................................................................................................................. 27
a) None........................................................................................................................... 27
b) Interactive .................................................................................................................. 27
c) Lines ........................................................................................................................... 27
7) Display............................................................................................................................ 28
a) Waveform................................................................................................................... 28
b) Grid............................................................................................................................. 28
8) Acquire ........................................................................................................................... 29
a) Start............................................................................................................................ 29
b) Stop ............................................................................................................................ 29
c) Zoom in ...................................................................................................................... 29
d) Zoom out.................................................................................................................... 29
e) Zoom reset ................................................................................................................. 29
f) Interpolation .............................................................................................................. 29
g) Demo mode................................................................................................................ 29
9) Utility.............................................................................................................................. 29
a) Zero offset Calibration ............................................................................................... 30
b) Auto Setup.................................................................................................................. 30
c) Default Settings.......................................................................................................... 30
10) Help ............................................................................................................................ 30
a) Contents..................................................................................................................... 30
b) About.......................................................................................................................... 30
20. Toolbar shortcut menu Icons ......................................................................... 30
1) Import from file.............................................................................................................. 30
2) Output to file.................................................................................................................. 30
3) Print................................................................................................................................ 30
4) Math Functions .............................................................................................................. 31
5) Reference Waveform ..................................................................................................... 31
6) Fast Fourier Transform................................................................................................... 31
7) Waveforms..................................................................................................................... 31
a) Line............................................................................................................................. 32
b) Dot.............................................................................................................................. 32
c) Render Normal........................................................................................................... 32
d) Render phosphor........................................................................................................ 32
e) Colors ......................................................................................................................... 32

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f) Intensity...................................................................................................................... 32
g) Phosphor Persistence................................................................................................. 32
8) Grid................................................................................................................................. 32
a) Turn Off/On................................................................................................................ 32
b) Scale ........................................................................................................................... 32
c) Intensity...................................................................................................................... 32
9) Cursor............................................................................................................................. 32
a) None........................................................................................................................... 32
b) Interactive .................................................................................................................. 32
c) Lines ........................................................................................................................... 32
10) Start acquiring............................................................................................................ 33
11) Stop acquiring ............................................................................................................ 33
12) Zoom in ...................................................................................................................... 33
13) Zoom out.................................................................................................................... 33
14) Reset Zoom ................................................................................................................ 33
15) Auto Setup.................................................................................................................. 33
16) Default Settings.......................................................................................................... 33
17) Full Screen.................................................................................................................. 33
18) Hide Toolbar............................................................................................................... 34
19) Toggle Measure.......................................................................................................... 34
20) Toggle Controls .......................................................................................................... 34
21) About.......................................................................................................................... 34
21. Control Panel functions.................................................................................. 34
1) Horizontal Time base controls ....................................................................................... 34
a) Rotary Knob blue........................................................................................................ 34
b) Time/Div dropdown box. ........................................................................................... 34
c) Format........................................................................................................................ 34
2) Vertical (First Channel)................................................................................................... 35
a) Enabled box................................................................................................................ 35
b) Dropdown box............................................................................................................ 35
c) Rotary Knob yellow. ................................................................................................... 35
d) Volt/Div dropdown box.............................................................................................. 35
e) Probe.......................................................................................................................... 35
f) AC Couple................................................................................................................... 35
g) Invert.......................................................................................................................... 35
3) Vertical (Second Channel).............................................................................................. 35
a) Enabled box................................................................................................................ 35
b) Dropdown box............................................................................................................ 35
c) Rotary knob green...................................................................................................... 36
d) Volt/Div dropdown box.............................................................................................. 36
e) Probe.......................................................................................................................... 36

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f) AC Couple................................................................................................................... 36
g) Invert.......................................................................................................................... 36
4) Trigger Dropdown boxes................................................................................................ 36
a) Trigger level................................................................................................................ 36
b) Trigger mode.............................................................................................................. 36
c) Trigger Sweep............................................................................................................. 36
d) Trigger Source. ........................................................................................................... 37
e) Trigger Slope. ............................................................................................................. 37
22. Common Terms Explained ............................................................................. 38
1) Bandwidth ...................................................................................................................... 38
2) Sample Rate ................................................................................................................... 38
3) Frequency and Period .................................................................................................... 38
4) Voltage ........................................................................................................................... 38
5) Phase.............................................................................................................................. 38
6) Rise Time ........................................................................................................................ 38
7) Vertical Sensitivity.......................................................................................................... 38
8) Sweep Speed.................................................................................................................. 39
9) Gain Accuracy................................................................................................................. 39
10) Time Base or Horizontal Accuracy.............................................................................. 39
11) Triggering ................................................................................................................... 39
12) ADC Resolution (Or Vertical Resolution).................................................................... 39
13) FFT .............................................................................................................................. 39
14) Record Length ............................................................................................................ 39
15) Probes ........................................................................................................................ 40
23. Application Examples:.................................................................................... 42
1) Basic Measurement Technique:..................................................................................... 42
2) Simple Measurement:.................................................................................................... 42
3) Capturing a Single-Shot Signal: ...................................................................................... 43
4) X-Y Application: .............................................................................................................. 44
5) Taking Cursor Measurements: ....................................................................................... 46
6) Automotive Tests and Measurements:.......................................................................... 47
7) Some 6022 Peculiarities:................................................................................................ 47
24. Appendix:...................................................................................................... 54
Appendix A: Specifications for Hardware Hantek 6022BE Oscilloscope................................ 54
Appendix B: Specifications for Software OPEN6022BE Application ...................................... 54
Appendix C: General Maintenance ........................................................................................ 56
Notes:..................................................................................................................................... 57

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1. This Manual:
This manual has been compiled to support the free OPEN6022BE software for the Hantek
6022BE Digital Storage Oscilloscope. Some contents are extracts from the original Hantek
manual as well as input from forum members on the www.eeblog.com website and other
general Internet sources. Here you can find a thread dedicated to the Hantek 6022BE DSO;
http://www.eevblog.com/forum/testgear/hantek-6022be-20mhz-usb-dso/.
Quite a substantial number of additional features and enhancements have been added, that
makes this oscilloscope a much more user friendly tool, thanks to Richard Krupskis’initiative
and his hard work.
This is a live document which can be updated and changed as the software is improved.
2. General Safety:
Read the following safety precautions carefully before operating the DSO to avoid any
personal injuries or damage to the device itself or any other devices connected to it. To avoid
potential hazards use the DSO only as specified by the supplier.
The information below is to make the user aware of the hazards and danger and is not
considered a complete and accurate guide for use in dangerous situations. The user should
consult other sources for more detailed and complete information or should be trained in the
correct usage thereof.
Avoiding Fire or Personal Injury
Do not use this device where the equipment will form a common ground to the mains power
when connected for testing!
Meaning the ground on the mains power plug is grounded to the device under test;
The PC used to run this DSO also has the mains power grounded to its ground and the USB
port ground;
The DSO powered by a separate power supply with its own ground now connected in
common to the PC via the USB connection.
Ensure that your mains supply is safe and has a recently tested good ground and that the
approved ground leakage units are fitted that have also been tested recently.
Also note that the AC mains power neutral is actually connected to ground on the supply side,
but a potential difference could exist between your mains ground and the neutral.
* Some AC to DC adapters which do not test any continuity between the AC input and the DC
output, used to power the DSO may cause the DSO PC drivers to fail immediately when
connecting the ground clip of the probe to another device powered also powered by an
“isolated” AC adaptor with the DSO connected to a Desktop PC instead of a laptop running on
batteries.
Note: Removing the oscilloscope grounding connections, either by using a two-pronged plug
or using an isolation transformer to power the scope is dangerous practice. The whole metal
enclosure of the oscilloscope can be at line voltage when one connects the probe to AC
circuitry under test.
The safest method is to connect the circuit one wants to test, i.e." a switching power supply"
via a 1:1 isolation transformer and use the oscilloscope as normal, with its earth lead
connection intact. This does not really reduce the danger as the device under test now has a
floating ground and that metal part can be dangerous if touched!
Better is to run the device under test from batteries if possible in any way.
When working with high voltages there is always a high level of danger involved, either
electrocution or blowing up equipment if the proper steps are not followed.
The following are listed as the various methods that can be used with caution and prior
knowledge, some are safer than other:
oA mains isolating transformer to power the device under test or
oPowering the device under test by batteries or

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oA laptop running on batteries. (Not connected to AC adapter) or
oA laptop and AC adapter with isolated ground (*Ground lead not connected to
secondary ground*) or
oA USB isolator (it has opto-isolators for data and an isolated DC-DC for power)
Connect and disconnect properly. Do not connect or disconnect probes or test leads
while they are connected to a voltage source.
Connect the probe to the oscilloscope before connecting the probe to the circuit under
test. Disconnect the probe input and the probe reference lead from the circuit under test
before disconnecting the probe from the oscilloscope.
Observe all maximum ratings. To avoid fire, shock hazard, or damage to equipment,
observe all ratings and markings on the product. Consult the oscilloscope manual for
further rating information before making connections to the oscilloscope.
Use proper probes. To avoid shock hazard, use the correctly rated probe for your
measurement.
Avoid exposure to circuit or wires. Do not touch exposed connections and components
when power is on.
Do not operate with suspected failures. If suspected damage occurs to the device, have it
inspected by qualified service personnel before further use.
Provide proper ventilation. Refer to the installation instructions for proper ventilation of
the oscilloscope.
Do not operate in wet/damp Conditions.
Do not operate in an explosive/inflammable area.
Keep device surfaces clean and dry.
3. Overview:
This oscilloscope is small, lightweight, portable, requires no external power and uses a PC for
displaying the test results. It is ideal for production testing, R&D, education, training,
applications involving analog circuit testing and troubleshooting. This is a basic, affordable
device, focused on low end use.
Typical DSO:
Replace this with a better picture if someone else can help.
4. PC System Requirements:
Minimum PC System Requirements
Laptop or Desktop PC with USB port
Operating System - Windows XP/Vista/7/8

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Processor –1 GHz
Memory –128 MB
Disk Space –500 MB disk free space
Screen resolution - 800 x 600
5. General Features
Dual channel;
Maximum real-time sample rate: 48MSa/s;
Memory depth: 1Mbyte/channel (PC memory);
Built-in Fast Fourier Transform function (FFT);
20 Selectable Automatic measurements;
Automatic cursor tracking measurements;
Waveform storage on PC;
User selectable fast offset calibration;
Mathematical functions, Add, Subtract, Multiply and Division;
Adjustable waveform intensity & colors, more effective waveform view;
User interface in several user-selectable languages;
6. General Check:
Please inspect the instrument after unpacking for the first time:
Check the shipping container for damage:
Keep the damaged shipping container or padding material until the contents of the shipment
have been checked for completeness and the instrument has been checked mechanically and
electrically.
Check the accessories:
Accessories supplied with the instrument are listed in "Accessories" in this guide. If the
contents are incomplete or damaged,please contact the seller.
Check the instrument:
In case there is any mechanical damage or defect, or the instrument does not operate
properly or fails performance tests, please notify the seller.
7. Accessories:
Two Passive Probes 10:1 (Included).
USB Cable (Included).
CD with Software, drivers and user manual (Included).
Probes 100:1 (Optional).
Laptop or Notebook (Not Included).
Current Clamp (Optional).
Variable DDS or Waveform Generator (Optional).

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8. Connections and Indications:
On the rear panel there are 2 connectors:
1. The USB port for connection to a PC (for standard male type B USB cable)
2. The USBXI ™ port for connection to other Hantek devices
This port is described by Hantek as a “Standard USBXI™interface, easily inserts into USBXI™
housing to make up a combination instrument”. Hantek has not implemented the use of this
connector it seems, and has not made any additional information available. It is thus assumed
that this is a proprietary Hantek connector port that will allow a Hantek device (i.e. Hantek
1025G Waveform Generator and others) to be connected to another Hantek device (i.e.
Hantek 6022BE DSO) with a special Hantek interface cable.
On the front panel you will see a red/green bi-color led, two BNC connectors and two hook
lugs:
1. The bi-color led between the Ch1 BNC connector and the edge of the enclosure only
has 3 states, off, flashing red or flashing green.
No Indication:
If no drivers are installed on PC, the led stays unlit when connected to the USB port.
Red flashing: (DSO and PC not communicating)
a. If drivers are already installed on the PC and DSO is connected to the USB
port, but program is not running or
b. when the program fails, due to timebase settings out of limit or
c. when program shows red STOP in left top corner
Green flashing: (DSO & PC is communicating)
a. When the DSO is connected to the USB port and program is running or
b. when program shows green WAIT in top left corner or
c. when program shows green AUTO in top left corner or
d. when program shows green Trig’D in top left corner
2. The two BNC connectors are for the Channel 1 & 2 probes.
3. The hook lug marked 1 KHz 2VP-P provides a fixed reference square wave for
adjusting probe compensation.
4. The hook lug marked with the ground symbol is the common ground of the DSO, used
to connect the ground clips to when adjusting probe compensation, as well as for
calibration of the DSO.

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9. Installing Hantek6022BE Software:
The latest Hantek6022be v1.0.4 software is available as of January 2014 and can be
downloaded from www.hantek.com . You will need to register on the website to download
the software, manual and drivers. This software is normally provided on a CD when
purchasing the oscilloscope.
When using the free OPEN6022BE software you will also need to install these Hantek drivers
for it to work.
While in Windows, insert the installation CD into the CD-ROM drive.
1. The installation should start up automatically. Otherwise in Windows Explorer, switch
to the CD-ROM drive and run Setup.exe or run Setup.exe from your installation folder
on your PC.
2. The software Installation will start. Click 'Next' to continue.
3. Choose a destination directory. Click 'Next' to continue.

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4. Check the setup information. Click Next to start the copying of files.
5. This Status dialog is displayed during the copying of files.
6. Updating Your System Configuration.
7. The installation is complete.
10.Driver Installation:
1. Connect the A-Type Black USB Plug of the USB cable to your PC’S USB port. If your USB
port cannot provide enough current then the Red USB plug can be plugged to another
USB port on the same PC. The red plug is only for additional power.
2. Connect the B-Type Plug of USB cable to USB port on the oscilloscope.
3. New hardware is found.
4. New hardware search wizard starts.

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5. New hardware search wizard starts to search for the driver.
6. New hardware wizard installs the “DRIVER”.
7. The wizard has finished installing the “DRIVER”

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8. New hardware is found.
9. Found new hardware Wizard. Select “Install the software automatically”.
10. New hardware wizard installs software and finishes new hardware search wizard.
11. Your new hardware is installed and ready to use.

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In Device Manager -> View –> Show Hidden Devices you will see both driver 1 and 2 installed,
only driver 2 shows as connected to PC. Driver 1 silently installs the firmware to the device on
boot and Driver 2 is for communication with the PC:
11.Installing OPEN6022BE Software:
This method may change as the OPEN6022BE software is developed further.
1. Additionally you need to install the latest Hantek6022BE drivers for your Windows version
as per previous point 9. If you already have the latest factory software working then the
latest drivers are already installed.
2. Optionally create a new folder called “Open6022be” in your Program Files folder on the C
drive.
3. Copy the compressed file Open6022BE_1_0_Binary.rar (or latest version) to this folder
and extract the compressed files. Right click on Open6022BE.exe and select “Send to”.
Click on “Desktop (create shortcut)”and a shortcut will be placed on your Desktop.
4. Run OPEN6022BE by clicking on this shortcut.
5. To uninstall just delete the folder and shortcut created above.
12.Probe Compensation Adjustment:
Probe compensation adjustment should be performed whenever attaching a probe to any
input channel for the first time, to match the characteristics of the probe to the channel input.
From the “Probe” menu, select attenuation 1:10 for both channels. Set the switch to “X10” on
both probes and connect them to CH1 and CH2 of the oscilloscope. Attach the probe tip to the
Reference signal output lug on the front face of the Oscilloscope and the reference ground lug
to the probe crocodile clip, select CH1 and CH2, and then press the “AUTO SET“ button in the
menu of the toolbar to give the best display of the reference signal or set manually as
required.

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Now check the shape of the displayed waveforms. Adjust each probe to give the best square
wave as per the picture below.
Correct Over compensated Under Compensated
If necessary, use a non-metallic tool (usually supplied with the probe) to adjust the trimmer
capacitor on the rear of the probe for the flattest square wave being displayed on the
oscilloscope.
Repeat if necessary.
WARNING: To avoid electric shock while using the probe, ensure that the insulated cable is in
good condition and does not touch the metallic portions of the probe while it is connected to
a voltage source.
13.Functional Check:
Perform this basic functional check to verify that your oscilloscope is operating correctly.
The USB patch cord supplied with the oscilloscope has two connections on one end, one black
and one red. The black one is a full USB cable, meaning it provides the connection to the PC as
well as the 5V DC power for the oscilloscope to run on. The red USB plug is only wired for
power and is used in a second USB port on your PC if the first (black) connection cannot
provide enough current to run the oscilloscope. Usually this not needed on newer PC’s.
Connect the oscilloscope
Connect the A-Type connector on the USB cable to your PC’s USB port and the B-Type
connector on the USB cable to the oscilloscope USB port.

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Input a signal to a channel on the oscilloscope:
The oscilloscope is equipped with dual channels and has a built in signal generator that puts
out a 2V P-P square wave at 1 KHz on an output lug on the front panel..
Input a signal in the following steps:
Set the attenuation switch on the probe to 10X and connect the probe to the oscilloscope CH1
BNC signal input. Align the slot in the probe connector to the pins on the BNC connector of
CH1 and insert, turn right to lock the probe connector in place.
Set the CH1 probe attenuation of the oscilloscope to X10 on the PC. (The default is X1).
Finally, attach the tip of probe to the 1 KHz output and the black crocodile clip to the Ground
connector. (See photo above).
A square wave will be displayed. (Approximately 1 kHz, 2V, peak- to- peak).
Test CH2 in the same way by repeating steps 2 and 3.
14.Self-Calibration:
The self-calibration routine lets you optimize the oscilloscope signal path for maximum
measurement accuracy, with reference to the zero setting. You can run the routine at any
time, but should also do so if the ambient temperature changes by 5°C or more. For accuracy,
power on the oscilloscope and wait about twenty minutes to ensure it is warmed up before
calibrating.
Then access the Toolbar “Utility -> Calibrate” option and follow the directions on the screen.
The software will remind you to connect both probes to the ground reference lug. The self-
calibration routine takes several minutes to complete, but does not give a completed message
on the OEM software. The OPEN6022BE software will give you a task completed message
immediately.
15.Limitations and things to be aware of:
You need to recognize that this is actually a budget, low end, oscilloscope, which cannot be
compared to high end devices or even be expected to deliver the same results.
Here are some known shortcomings or limitations:

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a) The Hantek 6022BE does not have the Logic Analyzer built in and the PCB has spare
positions without the components. The Hantek 6022BL has the Logic Analyzer
installed, but only one of the two devices can be used at a time.
b) The firmware is not situated on the PCB, but is loaded from the driver every time the
oscilloscope is connected to the PC.
c) The PCB does not have proper metal screening over the components although the
board has been designed for screening cans to be fitted. These can be retrofitted to
reduce noise. Base line noise is about 5mV in this state.
d) Some users have inspected the device and have provided the following observations,
which may be of interest to some.
The key components are as follows:
i. Microcontroller CY7C68013A-100AXC Cypress EZ-USB FX2LP USB 8/16 bit
16KB memory
ii. EEPROM 24LC02 2048 bits (2K)
iii. ADC (Analog to Digital Converter) AD9288BSTZ-40 Dual Channel with glued on
heat-sink.
iv. HRA Amplifiers 2 Analogue input channels. Each channel containing 2
cascaded 74HC4051, 5 pin 'HRA' amplifiers and a 3 pin fast switching dual
rectifier A7 device.
v. Regulator AMS1117 3V3.
vi. There are positions on the PCB for a 16 channel Logic Analyzer, using another
CY7C68013A-100AXC, 24LC02 and a SMSC USB2512A USB Hub. The complete
unit can be purchased as the Hantek 6022BL which has the logic analyzer
installed.
vii. There is also a position for a 5V supply. Interestingly, the only components
needed are a socket and a diode. There is no polyfuse in the external supply rail
unlike the USB feed. The unpopulated components opposite the front end are
for an alternate isolated supply for the front end. They are using an LTC3440
Buck regulator for the +5V and a classic 7660 Charge Pump for the -5V supply.
The question remains, why is it there if they already have an isolated DC-DC
supply (specifically a Mornsun A0505S-2W)?
viii. The screening cans have not been fitted over the input amplifiers but the PCB
has positions for such. This may explain some of the noise issues that are
reported but it could be other factors as well.

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ix. Noise level with no input checked on 20mV div range only 5-10mV noise and
impulses could be seen.
x. No physical AC coupling, but at least the user can add a capacitor himself to
do this.
xi. At 50ms (1Mhz) it starts acquiring at full 1M samples (1,047,552 for each
channel total 2x1047552)
At 20ms (1Mhz) it is at 523264 samples each Channel
At 10ms (1Mhz)= 523264
At 5ms (1Mhz)= 523264
At 1ms (1MHz) = 130048
At 100us (1Mhz) = 130048
At 20us (4Mhz) = 130048
At 10us (8Mhz) = 130048
At 5us (16Mhz) = 130048
At 2us (48Mhz) = 1016
Anything faster than 2us, it is still at 48MHz at 1016 samples each channel
(2032 total).
xii. The A7 device is just two fast switching diodes, which breaks down at 100V
and is used to protect the HRA input amplifier.
xiii. Also take note that instead of your usual 1M ohm resistor and trimmer
capacitor in parallel connected from input signal to ground we have the input
signal going through a 909K resistor with the trimmer capacitor in parallel
with it, then shunted to ground through a 100K resistor and an SMD capacitor
in parallel. To the input, it looks like a 1M resistor to ground, but the signal is
being tapped between 909K and 100K, then going to the first Op Amp.
xiv. A 5V input signal in 1x mode is going to give a 500mV signal at the node
between the 909K and 100K and at the ADC input. Anything more than
500mV will be clipped by the ADC.This would mean with the probe in 1x
mode is going to be safe from overloading the input up to 35V. (As per
specifications maximum input should not exceed +35V and -35V in 1x which is
+350V and -350V in 10x mode).
xv. The actual input voltage is limited to a +- 5.0V signal. That means with a 1x
probe, signals from -5V to +5V can be displayed; with a 10x probe -50V to
+50V, with a 100X probe -500V to +500V and so forth. Clipping will occur if the
voltage at the input exceeds 5V. With the proper probe you can thus measure
higher voltages than 5V.

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Below is a picture showing the clipping when a signal with a peak to peak
voltage of 11.5V is applied:
xvi. Once nice thing about a schematic like this is it makes plain the fact that the
6022BE, unlike most scopes that have 3 or 4 decades of Sensitivity settings,
has only one decade. I.e., 100mV/div to 1V/div. That's one area they saved
money by compromising on (along with the limited sample rates, and no real
triggering). [Normally, you see anywhere from 10 mV-5V/div, to 1 mV-
10V/div.]
The settings below 100mV/div are just zoomed (e.g., like an Agilent with 4
mV/div claims 1 mV/div, by zooming). Since at that level, the FS range of the
ADC is 1,024 mV, and it is 8-bits (256 levels), that means the LSB is 4 mV. So
it's not surprising to see "noise" on the 20 mV/div setting, since in addition to
real noise (that shielding and proper grounding can help minimize), the
uncertainty present in the LSB will result in jitter of +/-4 mV, all by
itself. Which becomes more visible the further in you zoom.
xvii. With a USB scope, remember one very important thing:
Your 6022BE scope shares a ground with the USB port, which means you
share the ground with your computer, which means the monitor, which
means... well, your dish washer, your refrigerator... May I suggest: To ensure
isolation, use a laptop on battery, NO external monitor and NO wired
network. Or an isolation transformer.
xviii. Also see “Some 6022 Peculiarities” in the Application Examples section for
more detail.