Uni-Trend UTD2000E Series User manual

UNI-T
Manual
UTD2000E Series Programmable Digital Oscilloscope
June 2017
Uni-Trend Technology (China) Co., Ltd.

UNI-T
UTD2000E Series Osilloscope Pro
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Manual
Warranty and Statement
Copyright
2017 U n i - T r e n d T e c h n o l o g y ( C h i n a ) C o . , L t d .
Brand Information
UNI-T is the registered trademark of Uni-Trend Technology (China) Co., Ltd.
Software Version
00.00.01
Software upgrade may have some change and add more function, please subscribe
UNI-T website to get the new version or contact UNI-T.
Statement
 UNI-T products are protected by patents (including obtained and pending) in China and
other countries and regions.
 UNI-T reserves the right to change specifications and prices.
 The information provided in this manual supersedes all previous publications.
 Information provided in this manual is subject to change without prior notice.
 UNI-T shall not be liable for any errors that may be contained in this manual. For any
incidental or consequential damages, arising out of the use or the information and
deductive functions provided in this manual.
 Without the written permission of UNI-T, this manual cannot photocopied, reproduced
or adapted.
Product Certification
UNI-T has certified that the product conforms to China national product standard and
industry product standard as well as ISO9001:2008 standard and ISO14001:2004
standard. UNI-T will go further to certificate product to meet the standard of other
member of the international standards organization.
Contact Us
If you have any question or problem, you can contact us,
Website：https://www.uni-trend.com

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UTD2000E Series Osilloscope Pro
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Manual
e format, symbols, parameters, and abbreviations of the SCPI command.
Instruction Format
The SCPI command is a tree-like hierarchy consisting of multiple subsystems, each
consisting of a root keyword and one or more hierarchical key words. The command
line usually begins with a colon ":"; Keywords are separated by the colon ":",
followed by optional parameter settings. The command keyword is separated by
spaces from the first parameter. The command string must end with a newline
<NL> character. Add the question mark "? " after the command line. It is
usually indicated that this feature is being queried.
Symbol Description
The following four symbols are not part of SCPI command, it cannot send with the
command. It usually used as supplementary description of command parameter.
 Brace { } usually contains multiple optional parameters, it should select one
parameter when send command.
Such as DISPlay:GRID:MODE { FULL | GRID | CROSS | NONE} command
 Vertical Bar | used to separated multiple parameters, it should select one parameter
when send command.
Such as DISPlay:GRID:MODE { FULL | GRID | CROSS | NONE} command
 Square Brackets [ ] the contents in square brackets (command keywords) can
omissible. If the parameter is ignoret, the instrument will set the parameter as the
default value.
Such as MEASure:NDUTy? [<source>] command, it presents current channel
 Triangular Brackets < > The parameter in the brackets must be replaced with a
valid value.
Such as use DISPlay:GRID:BRIGhtness 30 form to send DISPlay:GRID:BRIGhtness
<count> command.

UNI-T
UTD2000E Series Osilloscope Programming Manual
Parameter Description
The parameter in this manual can divide into five types: Boolean, Integer, Real,
Discrete, ASCII string
 Boolean
Parameter value can set “ON” (1) or “OFF” (0)
Such as SYSTem:LOCK {{1 | ON} | {0 | OFF}}
 Integer
Parameter can take any valid integer value unless there have some other
descriptions.
Such as command: DISPlay:GRID:BRIGhtness <count> , parameter of
<count> can take integer from 0~100
Note: Do not set decimal as parameter, otherwise it may occur error.
 Real
Parameter can take any valid integer value unless there have some other
descriptions.
Such as for command CH1, CHANnell: OFFSet <offset> , parameter of <offset>
can take integer value.
 Discrete
Parameter can only take some specified numbers or characters.
Such as command DISPlay:GRID:MODE { FULL | GRID | CROSS | NONE}
parameter can only take FULL, GRID, CROSS, NONE
 ASCII Character String
String parameter contain all ASCII string sets. Strings must begin and end
with paired quotes; it can use single or double quotation marks. The quotation
and delimiter can also be part of a string by typing it twice and not adding any
characters.
Such as set IP SYST:COMM:LAN:IPAD "192.168.1.10".

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Shorthand Rule
All command can identify capital and small letter, if command need enter shorthand,
it should be all capital letter.
Data Return
Data return is divided into single data and batch data. The single data return is the
corresponding parameter type, in which the real return type is presents by the
scientific notation method. The part before e retains three figure behind the decimal
point, and the e part retains three figure; the batch return must be obey IEEE
488.2# string data format, ‘#’+ the length of character bits[fixed to one character]+
ASCII valid value+ valid data+ end string[‘\n’]
Such as #3123xxxxxxxxxxxxxxxxxxx\n presents 123 strings batch data return format, ‘3’
presents “123” occupies three character bits.
Notes：* presents return valid data.

UNI-T
UTD2000E Series Osilloscope Programming Manual
SCPI Command
IEEE488.2 Common Command
*IDN?
 Command format：
*IDN?
 Functional description：
For query manufacture name, model, product serial number and software version.
 Return format：
Manufacture name, model, product serial number, software version separated by dot
mark.
 For example：
UNI-T Technologies, UPO2000CS, UPO1000, 00.00.01
*RST
 Command format：
*RST
 Functional description：
 Restore factory settings and clear the entire error message, send and receive queue buffers.
SYSTem Command
The command used for the oscilloscope basic operation, including operating control,
full qwerty lock, error queue and system setup.
:RUN
 Command format：
:RUN
 Functional description：
Oscilloscope start to sampling, execute :STOP command to stop it.
:STOP
 Command format：
:STOP
 Functional description：
Stop sampling function, execute :RUN command to start it.

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:AUTO
 Command format：
:AUTO
 Functional description：
Set control parameter automatically, use auto function to achieve the best display effect.
:SYSTem:LOCK
 Command format：
:SYSTem:LOCK {{1 | ON} | {0 | OFF}}
:SYSTem:LOCK?
 Functional description：
For lock/unlock full qwerty.
 Return format：
Query return full qwerty lock status, 0 presents unlock，1 presents lock.
 For example：
:SYSTem:LOCK ON/:SYST:LOCK 1 full qwerty lock
:SYSTem:LOCK OFF/:SYST:LOCK 0 unlock full qwerty
:SYSTem:LOCK? query return 1，it presents locked
:SYSTem:ERRor
 Command format：
:SYSTem:ERRor
:SYSTem:ERRor?
 Functional description：
Empty error message queue.
 Return format：
Query return the last time error message, return error message by query format <message
number>,<message content>, <message number> is a integer，<message content> is ASCII
character string with double quotation marks.
like-113,"Undefined header; command cannot be found"
 For example：
:SYSTem:ERR empty error message queue
:SYSTem:ERR? query return：
-113,"Undefined header; command cannot be found"
presents undefined command head

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:SYSTem:SETup
 Command format：
:SYSTem:SETup <setup_data>
:SYSTem:SETup?
 Functional description：
Set system configuration data, <setup_data> is conform to IEEE 488.2 # format of binary data.
In sending，data flow is followed command character and complete send in time.
In reading, make sure there has enough buffer to receive data flow, otherwise it may occurred
abnormal.
 Return format：
Query return system setup data, return format is conform to IEEE 488.2 # format of binary data.
:SYSTem:LANGuage
 Command format：
:SYSTem:LANGuage { ENGLish | SIMPlifiedchinese | TRADitionalchinese }
:SYSTem:LANGuage?
 Functional description：
Set system language.
 Return format：
Query return{ ENGLish | SIMPlifiedchinese | TRADitionalchinese }.
 For example：
:SYSTem:LANGuage ENGL set system language as English
:SYSTem:LANGuage? query returnENGLish
:SYSTem:CAL
 Command format：
:SYSTem:CAL
 Functional description：
Set system self-calibration, during self-calibration, oscilloscope can not communication.
:SYSTem:CLEAr
 Command format：
:SYSTem:CLEAr
 Functional description：
Empty system saved waveform and setup data.

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:SYSTem:CYMOmeter
 Command format：
:SYSTem:CYMOmeter {1 | ON} | {0 | OFF}
:SYSTem:CYMOmeter?
 Functional description：
The switch of frequency meter.
 Return format：
Query return frequency meter status，1 presents on, 0 presents off.。
 For example：
:SYSTem:CYMOmeter ON open frequency meter
:SYSTem:CYMOmeter? query return 1
:SYSTem:CYMOmeter:FREQuency?
 Command format：
:SYSTem:CYMOmeter:FREQuency?
 Functional description：
Acquire measured frequency value of frequency meter.
 Return format：
Query return measured frequency value of frequency meter, invalid value return *.
 For example：
:SYSTem:CYMOmeter:FREQuency? query return 1.20000E+3
:SYSTem:SQUare:SELect
 Command format：
:SYSTem:SQUare:SELect { 10Hz | 100Hz | 1KHz | 10KHz }
:SYSTem:SQUare:SELect?
 Functional description：
Select square wave output.
 Return format：
Query return{ 10Hz | 100Hz | 1KHz | 10KHz }。
 For example：
:SYSTem:SQUare:SELect 10Hz select 10Hz of saquare wave output
:SYSTem:SQUare:SELect? query return 10Hz
:SYSTem:MNUDisplay
 Command format：
:SYSTem:MNUDisplay { 5S | 10S | 20S | INFinite}

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:SYSTem:MNUDisplay?
 Functional description：
Set menu display time, INFinite presents menu is display all time.
 Return format：
Query return{ 5S | 10S | 20S | INFinite }。
 For example：
:SYSTem:MNUDisplay 5S set menu display base as 5s, automatic fold.
:SYSTem:MNUDisplay? query return 5S
:SYSTem:BRIGhtness
 Command format：
:SYSTem:BRIGhtness <count>
:SYSTem:BRIGhtness?
 Functional description：
Set screen luminance, <count> take value from 1~100，the bigger the number, the brighter the
screen.
 Return format：
Query return the current screen luminance.
 For example：
:SYSTem:BRIGhtness 50 screen luminance as 50
:SYSTem:BRIGhtness? query return 50
:SYSTem:VERSion?
 Command format：
:SYSTem:VERSion?
 Return format：
Query return version information, 128 bytes character string.
HW is hardware version number, SW is software version numer，PD is created date, ICV is
protocol version number.
 For example：
:SYST:VERS? query return HW:1.0;SW:1.0;PD:2014-11-20;ICV:1.4.0
:SYSTem:COMMunicate:LAN:APPLy
 Command format：
:SYSTem:COMMunicate:LAN:APPLy
 Functional description：
The current internet parameter take effect immediately.

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:SYSTem:COMMunicate:LAN:GATEway
 Command format：
:SYSTem:COMMunicate:LAN:GATEway <gateway>
:SYSTem:COMMunicate:LAN:GATEway?
 Functional description：
For the default gateway, <gateway> is belong to ASCII character string parameter，format is
xxx.xxx.xxx.xxx.
 Return format：
Query return the default gateway.
 For example：
:SYST:COMM:LAN:GATE "192.168.1.1" set default gateway as 192.168.1.1
:SYST:COMM:LAN:GATE? query return 192.168.1.1
:SYSTem:COMMunicate:LAN:SMASK
 Command format：
:SYSTem:COMMunicate:LAN:SMASK <submask>
:SYSTem:COMMunicate:LAN:SMASK?
 Functional description：
Set subnet mask, <submask> is belong to ASCII character string parameter ，format is
xxx.xxx.xxx.xxx.
 Return format：
Query return subnet mask.
 For example：
:SYST:COMM:LAN:SMASK "255.255.255.0" set subnet mask as 255.255.255.0
:SYST:COMM:LAN:SMASK? query return 255.255.255.0
:SYSTem:COMMunicate:LAN:IPADdress
 Command format：
:SYSTem:COMMunicate:LAN:IPADdress <ip>
:SYSTem:COMMunicate:LAN:IPADdress?
 Functional description：
Set IP address, <ip> is belong to ASCII character string parameter，format is xxx.xxx.xxx.xxx。
 Return format：
Query return IP address
 For example：

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:SYST:COMM:LAN:IPAD "192.168.1.10" set IP address as 192.168.1.10
:SYST:COMM:LAN:IPAD? query return192.168.1.10
:SYSTem:COMMunicate:LAN:DHCP
 Command format：
:SYSTem:COMMunicate:LAN:DHCP {{1 | ON} | {0 | OFF}}
:SYSTem:COMMunicate:LAN:DHCP?
 Functional description：
For switch configuration mode（auto IP）and（manual IP）.
 Return format：
Query return dynamic configuration mode, 0 presents（manual IP），1 presents（auto IP）.
 For example：
:SYST:COMM:LAN:DHCP ON turn on IP dynamic configurarion mode
:SYST:COMM:LAN:DHCP? query return 1
:SYSTem:COMMunicate:LAN:MAC?
 Command format：
:SYSTem:COMMunicate:LAN:MAC?
 Return format：
Query return MAC physical address.
 For example：
:SYST:COMM:LAN:MAC? query return 00-2A-A0-AA-E0-56
KEY Command
This command is to control button and knob on the oscilloscope panel.
:KEY:<key>
 Command format：
:KEY:<key>
:KEY:<key>:LOCK { {1 | ON} | {0 | OFF} }
:KEY:<key>:LOCK?
:KEY:<key>:LED?
 Functional description：
Set button function and button lock status, <key> definition and description, see Appendix 1：
Key Table.
 Return format：
Query return key lock status or LED status.
Lock status：0 presents unlock, 1 presents lock；

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LED light staus：0 presents light off, 1 presents light on.
 For example：
:KEY:AUTO set oscilloscope control parameter automatically
:KEY:AUTO:LOCK ON/OFF lock/unlock button
:KEY:AUTO:LOCK? query return this key lock status, 1 presents locked
:KEY:AUTO:LED? query return LED status，0 presents light off
CHANnel Command
This command is to set channel independently. <n> take value as 1/2/3/4/5/6/7/8/9, it
presents {CH1/CH2/ CH3/ CH4/ MATH/ REF-A/ REF-B/ REF-C/ REF-D}.
Notes: this command in instruction set is not only valid for physical channel, but also
valid for MATH and reference channel parameter.
:CHANnel<n>:BWLimit
 Command format：
:CHANnel<n>:BWLimit {{1|ON}|{0|OFF}}
:CHANnel<n>:BWLimit?
 Functional description：
Set bandwidth limit function is ON (turn on bandwidth to 20MHz，to reduce display noise) or
OFF (turn off bandwidth to full display）
 Return format：
Query return 1 or 0，it presents ON or OFF.
 For example：
:CHAN1:BWL ON turn on channel 1 bandwidth limit
:CHAN1:BWL? query return 1，it presents channel 1 bandwidth limit is turn on
:CHANnel<n>:COUPling
 Command format：
:CHANnel<n>:COUPling {DC|AC|GND}
:CHANnel<n>:COUPling?
 Functional description：
Set channel coupling mode, DC presents AC and DC component of input signal; AC presents DC
component of blocking input signal; GND (grounding) presents break input signal.
 Return format：
Query AC, DC or GND.
 For example：
:CHAN1:COUP DC set channel 1 coupling mode as DC
:CHAN1:COUP? query return DC

UNI-T
UTD2000E Series Osilloscope Programming Manual
:CHANnel<n>:DISPlay
 Command format：
:CHANnel<n>:DISPlay { {1|ON} | {0|OFF} }
:CHANnel<n>:DISPlay?
 Functional description：
The switch of the specified channel.
 Return format：
Query return 1 or 0，it presents ON or OFF.
 For example：
:CHAN1:DISP ON turn on channel 1
:CHAN1:DISP? query return 1，it presents channel 1 is turn on
:CHANnel<n>:INVert
 Command format：
:CHANnel<n>:INVert { {1|ON} | {0|OFF} }
:CHANnel<n>:INVert?
 Functional description：
Set wave inversion function is ON (turn on) or OFF (back to normal display）.
 Return format：
Query return 1 or 0，it presents ON or OFF.
 For example：
:CHAN1:INV OFF turn off channel 1 inversion function
:CHAN1:INV? query return 0，it presents channel 1 inversion function is off
:CHANnel<n>:PROBe
 Command format：
:CHANnel<n>:PROBe { 0.01X | 0.02X | 0.05X | 0.1X | 0.2X | 0.5X | 1X | 2X | 5X | 10X |20X
|50X |100X |200X |500X |1000X }
:CHANnel<n>:PROBe?
 Functional description：
Set the probe attenuation factor corresponding to the probe.
 Return format：
Query return { 0.01X | 0.02X | 0.05X | 0.1X | 0.2X | 0.5X | 1X | 2X | 5X | 10X |20X |50X |100X
|200X |500X |1000X }.
 For example：
:CHAN1:PROB 10X set channel 1 probe attenuation factor as 10
:CHAN1:PROB? query return 10X

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:CHANnel<n>:OFFSet
 Command format：
:CHANnel<n>:OFFSet <offset>
:CHANnel<n>:OFFSet?
 Functional description：
Set wave offset in vertical position, <n> take value as 1/2/3/4/5, it presents {CH1/CH2/CH3/
CH4/ MATH }.
 Return format：
Query return offset value by scientific notation method, unit is related with the current channel
unit.
 For example：
:CHAN1:OFFS 20V set channel 1 vertival offset as 20V
:CHAN1:OFFS? query return 2.000e001
:CHANnel<n>:SCALe
 Command format：
:CHANnel<n>:SCALe {<scale> | UP | DOWN}
:CHANnel<n>:SCALe?
 Functional description：
Set voltage base in vertical position.
<scale>：voltage base value；
UP：plus one position based on the current position；
DOWN ：minus one position based on the current position.
 Return format：
Query return the current voltage position value by scientific notation method, unit is V.
 For example：
:CHAN1:SCAL 20V set channel 1 voltage base as 20V
:CHAN1:SCAL? query return 2.000e001。
:CHAN1:SCAL UP plus one position based on 20V voltage base
:CHANnel<n>:UNITs
 Command format：
:CHANnel<n>:UNITs {VOLTs|AMPeres }
:CHANnel<n>:UNITs?
 Functional description：
Set channel unit as VOLTs and AMPeres.
 Return format：
Query return VOLTs, AMPeres.

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 For example：
:CHAN1:UNIT VOLT set channel 1 unit as VOLTs
:CHAN1:UNIT? query return VOLTs
:CHANnel<n>:VERNier
 Command format：
:CHANnel<n>:VERNier { {1|ON} | {0|OFF} }
:CHANnel<n>:VERNier?
 Functional description：
Set position accommodation mode, ON presents Fine tuning，to further subdivides between coarse
tuning settings to improve vertical resolution; OFF presents Coarse tuning， based on 1-2-5
system to set vertical sensitivity.
 Return format：
Query return 1 or 0，it presents ON or OFF.
 For example：
:CHAN1:VERN ON turn on channel 1 fine tuning function
:CHAN1:VERN? query return 1
:CHANnel<n>:SELect
 Command format：
:CHANnel<n>:SELect
:CHANnel<n>:SELect?
 Functional description：
For channel selection.
 Return format：
Query return 1 or 0，it presents ON or OFF.
 For example：
:CHAN1:SELect select channel 1
:CHAN1:SELect? query return 1，it presents channel 1 has been selected

UNI-T
UTD2000E Series Osilloscope Programming Manual
TIMebase Command
This command is to change the current channel horizontal scale (time base) and
horizontal position of trigger in memory (trigger offset). Horizontal scale change will
make waveform expand or shrink relative to screen center. Horizontal position change
will make wave shift relative to screen center.
:TIMebase:MODE
 Command format：
:TIMebase:MODE {MAIN | WINDow}
:TIMebase:MODE?
 Functional description：
Set timebase mode, MAIN or WINDow (zoom timebase <Zoomed>）
 Return format：
Query return MAIN or WINDow.
 For example：
:TIM:MODE MAIN set timebase mode as MAIN
:TIM:MODE? query return MAIN
:TIMebase:OFFSet
 Command format：
:TIMebase:OFFSet <offset>
:TIMebase:OFFSet?
 Functional description：
For adjust MAIN offset value, wave shift relative to screen center.
 Return format：
Query return <offset> value by scientific notation，unit is S.
 For example：
:TIM:OFFS 1s set MAIN offset value as 1s
:TIM:OFFS? query return 1.000e000

UNI-T
UTD2000E Series Osilloscope Programming Manual
:TIMebase:WINDow:OFFSet
 Command format：
:TIMebase:WINDow:OFFSet <offset>
:TIMebase:WINDow:OFFSet?
 Functional description：
For adjust WINDow offset value（zoom timebase <Zoomed>）,wave shift relative to screen center.
 Return format：
Query return<offset> value by scientific notation method unit is S.
 For example：
:TIM:WIND:OFFS 1 set WINDow offset value as 1s
:TIM:WIND:OFFS? query return 1.000e000
:TIMebase:SCALe
 Command format：
:TIMebase:SCALe {<scale> | UP | DOWN}
:TIMebase:SCALe?
 Functional description：
Set timebase position of MAIN, s/div.
<scale>：timebase value；
UP：plus one position based on the current position；
DOWN ：minus one position based on the current position.
 Return format：
Query return< scale> value by scientific notation method, unit is s/div.
 For example：
:TIM:SCAL 2 set MAIN offset value as 2s/div
:TIM:SCAL? query return 2.000e000
:TIMebase:WINDow:SCALe
 Command format：
:TIMebase:WINDow:SCALe {<scale> | UP | DOWN}
:TIMebase:WINDow:SCALe?
 Functional description：
For adjust WINDow timebase（zoom timebase <Zoomed>）, that is s/div.
 Return format：
query return < scale> value by scientific notation method, in s/div.
 For example：
:TIM:WIND:SCAL 2 set WINDow timebase offset value as 2s/div
:TIM:WIND:SCAL? query return 2.000e000

UNI-T
UTD2000E Series Osilloscope Programming Manual
FUNCtion Command
Display the operational result plus, minus, multiply, divide, AND, OR, negation,
exclusive OR and FFT of CH1,CH2,CH3,CH4 waveform, set filter to use expression
operation.
:FUNCtion:MATH:MODE
 Command format：
FUNCtion:MATH:MODE {MATH | FFT | FILTer}
FUNCtion:MATH:MODE?
 Functional description：
Select MATH function mode.
 Return format：
Query return {MATH | FFT | FILTer }
 For example：
FUNC:MATH:MODE FFT select MATH mode as FFT mode
FUNC:MATH:MODE? query return FFT
:FUNCtion:OPERation
 Command format：
:FUNCtion:OPERation {ADD | SUBTract | MULTiply | DIVide }
:FUNCtion:OPERation?
 Functional description：
Set functional operator, including basic operation and logic operation, they are plus, minus,
multiply, divide, AND, OR, negation, exclusive OR.
 Return format：
query return {ADD | SUBTract | MULTiply | DIVide }
 For example：
:FUNCtion:OPERation ADD use puls operator：src1+src2
:FUNCtion:OPERation? query return ADD
:FUNCtion:SOURce<m>
 Command format：
:FUNCtion:SOURce<m> <value>
:FUNCtion:SOURce<m>?
 Functional description：
SOURce <m> presents source 1 or source 2, <m> take value as 1, 2.
SOURce1 is to select the first source of operator and math function or it can be single source of
Filter and FFT.
SOURce2 is to select the second source of operator and math function. Single source of Filter,

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and FFT is not applicable.
<value> presents CHANnel<n>， <n> take vaule as 1/2/3/4{CH1/ CH2/ CH3/ CH4}.
 Return format：
Query return <n> take valu as 1/2/3/4/5/6/7/8/9.
 For example：
:FUNCtion:SOUR1 CHAN1 choose channel 1 as source 1
:FUNCtion:SOUR1? query return1
:FUNCtion:SOUR2 CHAN2 choose channel 2 as source 2
:FUNCtion:SOUR2? query return 2
:FUNCtion:OPERation ADD add source 1 and source 2
:FUNCtion:FFT:WINDow
 Command format：
:FUNCtion:FFT:WINDow {RECTangular|HANNing|HAMMing|BMAN}
:FUNCtion:FFT:WINDow?
 Functional description：
FFT windowing to intercept signal. RECT, HANN, HAMM, BMAN is rectangular window,
Hanning window, Hamming window and Blacman window respectively.
 Return format：
Query return {RECTangular|HANNing|HAMMing|BMAN}.
 For example：
:FUNCtion:SOUR1 CHAN1 set channel 1 as source 1
:FUNC:FFT:WIND HAMM windowing Hamming window
:FUNC:FFT:WIND? query return HAMMing
:FUNCtion:FFT:VTYPe
 Command format：
:FUNCtion:FFT:VTYPe {VRMS|DBRMS}
:FUNCtion:FFT:VTYPe?
 Functional description：
Set unit of FFT vertical diection as dbrms or VRMS. dbrms presents root mean square of power;
VRMS presents root mean square of voltage.
 Return format：
Query return VRMS, DBRMS
 For example：
:FUNCtion:SOUR1 CHAN1 set channel 1 as source 1
:FUNC:FFT:VTYP VRMS set unit of FFT vertical diection as root mean square of voltage
:FUNC:FFT:VTYP? query return VRMS