Agilent Technologies B2902 Service Manual download pdf (Page 139)

Agilent B2900 SCPI Command Reference, Edition 2 4- 17

Subsystem Commands

:CALCulate:MATH[:EXPRession][:DEFine]

Resources used in the expressions

The following resources can be used in user-defined math expressions.

• Reserved variables

The variables listed in Table 4-1 are reserved for reading the channel output or

measurement data.

Scalar variable is used for spot measurement data.

Vector (array) variable is used for sweep measurement data.

• Math operators

The following operators are available.

• Arithmetic operators: +, -, *, /, ^, see Table 4-2

• Elementary functions: ln, log, sin, cos, tan, exp

The functions log and ln perform the operation after calculating the absolute

value. So if a negative value is specified, they do not result in an error, but

calculate as if a positive value was specified. For example, log(-10) results in

log(10)=1.

• Numeric value

Decimal (0 to 4294967294, 4294967295 indicates -1), binary (32 bit, 0 to

0b11111111111111111111111111111111), or hexadecimal (0 to 0xFFFFFFFF).

Table 4-1 Reserved Variables

Reserved variable

a. The numeric suffix [c] is effective for specifying the channel. For exam-

ple, use CURR2 to read the current spot measurement data for channel

2. See

“Numeric Suffix” on page 1-8.

Description

Scalar Vector

SOUR[c] SOUR[c][] Source output setting data

VOLT[c] VOLT[c][] Voltage measurement data

CURR[c] CURR[c][] Current measurement data

RES[c] RES[c][] Resistance measurement data

TIME[c] TIME[c][] Time (timestamp) data

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Agilent Technologies B2902 Service Manual Page 139