Numeric Data Suffix Reference
Unit suffixes are not required for data parameters, provided the values are scaled for the global default units. The MS4640A SCPI default units are:
• Hz (hertz) for frequency-related parameters
• s (second) for time-related parameters
• m (meter) for distance-related parameters
• ohm for impedance-related parameters
• dB for power-related parameters
• Henry and Farad for reactance-related parameters
For example, the commands below set the MS4640A marker 1 frequency to 3 GHz.
:CALCulate1:MARKer1:X 3000000000
:CALCulate1:MARKer1:X 3.0E9
The following table provides a reference to the I/O parameter types (and the appropriate multiplier) used with the MS4640A VNA.
Numeric Data Suffix
Code | Parameter Type | Multiplier |
DB, DBL, DBM | Power | 1.0 |
DEG | Phase | 1.0 |
RAD | Phase | 180/π (180/Pi) |
HZ | Frequency (Hertz) | 1.0 |
KHZ | Frequency (Kilohertz) | 1.0E3 |
MHZ | Frequency (Megahertz) | 1.0E6 |
GHZ | Frequency (Gigahertz) | 1.0E9 |
REU | Real | 1.0 |
IMU | Imaginary | 1.0 |
S | Time | 1.0 |
MS | Time (Millisecond) | 1.0E-3 |
US, USC | Time (Microsecond) | 1.0E-6 |
NS, NSC | Time (Nanosecond) | 1.0E-9 |
PS, PSC | Time (Picosecond) | 1.0E-12 |
M, MTR | Distance (Meter) | 1.0 |
CM, CMT | Distance (Centimeter) | 1.0E-2 |
MM, MMT | Distance (Millimeter) | 1.0E-3 |
OHM | Impedance | 1.0 |
V, VLT | Voltage | 1.0 |
MV | Voltage (Millivolt) | 1.0E-3 |
XM3 | Unitless | 1.0E-3 |
XX1 | Unitless | 1.0 |
XX3 | Unitless | 1.0E3 |