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SCPI Command Introduction

etc. Special values of numerical parameter are also acceptable, such as MIN,

MAX and DEF. In addition, suffixes for engineering units can also be sent

together with numerical Parameter (including M, k, m or u). If the command

accepts only some specific values, the instrument will automatically round the

input parameter to acceptable values. The following commands require

numerical Parameter of frequency value:

[SOURce[1|2]:]FREQuency:CENTer {<Frequency>|MINimum|MAXimum}

 <NR1>: represents an integer value, such as 273;

 <NR2>: represents a real number in floating-point format, such as

0.273;

 <NR3>: represents a real number in scientific notation, such as

2.73E+2;

 <Nrf>:The extensible form includes <NR1>, <NR2> and <NR3>;

 <Nrf+>: The extensible decimal form includes <NRf> and MIN MAX

DEF, MIN and MAX represent the minimum and maximum finite

number. DEF is the default of the parameter.

⚫ Discrete parameter

Discrete Parameter are used for settings with limited number of programming

values (such as IMMediate, EXTernal or BUS). They can use short and long

format like key words of commands. They may be expressed in both upper and

lower case. The query response always returns uppercase Parameter in short

format. The following commands require discrete Parameter in voltage unit:

[SOURce[1|2]:]VOLTage:UNIT {VPP|VRMS|DBM}

⚫ Boolean parameter

Boolean Parameter refer to true or false binary conditions. In case of false

conditions, the instrument will accept "OFF" or "0". In case of true conditions,

the instrument will accept "ON" or "1". In query of Boolean settings, the

instrument will always return "0" or "1". Boolean Parameter are required by the

following commands:

DISPlay {OFF|0|ON|1}

⚫ ASCII string Parameter

String Parameter may actually include all ASCII character sets. Character

strings must start and end with paired quotation marks; and single quotation

marks or double quotation marks are both allowed. Quotation mark separators

may also act as one part of a string, they can be typed twice without any

character added between them. String parameter is used in the following

ITech IT-M7700 Series Programming Guide

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