R&S 1424.7005.02, Руководство пользователя

Страница: 456 / 514

Remote Control Basics
R&S
®
NRX
456 User Manual 1178.5566.02 ─ 07
●
Character strings
●
Block data
The parameters required for each command and the allowed range of values are
specified in the command description.
Numeric values
Numeric values can be entered in any form, i.e. with sign, decimal point and exponent.
Values exceeding the resolution of the instrument are rounded up or down. The man-
tissa can comprise up to 255 characters, the exponent must lie inside the value range
-32000 to 32000. The exponent is introduced by an "E" or "e". Entry of the exponent
alone is not allowed.
Units
For physical quantities, you can enter the unit. Units and prefixes, as defined by the
international system of units (SI), are allowed and recognized. If you omit the unit, the
default or set unit is used. See also
Chapter 13.5.1.3, "Units" , on page 207.
If you need decimal multiples and submultiples of a unit, you can use SCPI prefixes,
see
Table 14-2 . Because SCPI uses only capital letters, it cannot distinguish between
upper and lower case characters. Therefore, if SI prefixes use the same letter in upper
and lower case, SCPI defines the meaning. An example is milli (m) and mega (M). In
SCPI, M means milli for all units except Hz and Ohm -
MHZ
means mega Hz, 10 6 Hz.
Table 14-2: SCPI prefixes
Factor SI name SI symbol SCPI prefix
10 3
kilo k K
10
6 mega M MA; also allowed are MOHM
and MHZ
10
9 giga G G
10 12
tera T T
10
-3 milli m M
Exception: Hz and Ohm
10
-6 micro
μ
U
10 -9
nano n N
10
-12 pico p P
Special numeric values
The texts listed below are interpreted as special numeric values. For a query, the
numeric value is provided.
●
MIN/MAX
MINimum
and
MAXimum
denote the minimum and maximum value.
●
DEF
SCPI Command Structure
www.allice.de Allice Messtechnik GmbH