ETS-Lindgren SMART 1000 Mini-Reverb Cell - Manual (Page 26)

26 | Tuners
The current position (CP) read from the controller returns the corrected value.
The tuners can be operated in either a stepped (tuned) mode with step size from
two-degree increments, or a stirred mode with one of three available speed
settings using the Sx command. The stepper motors can provide position
feedback while switched on and when queried will reply with the current tuner
position relative to the zero position set at switch on.
Stored tuner positions do not exist; therefore, the tuners default to a setting of
zero degrees when powered on, regardless of actual position. The home position
for the tuners should always be set prior to performing measurements using the
indications provided on the inside of the chamber. This also represents the
home position used for the factory calibration.
Communication is through an RS-232 interface. Two ports are required for the
two tuners. Following are the required computer settings.
RS-232 P ORT S ETTINGS
Baud Rate: 9600
Bits: 8
Parity: None
Stop Bit: One
Flow Control: None
O PERATION
The antennas fitted to the SMART 1000 can be used for either transmit or
receive depending if the chamber is being used for immunity or emission
measurements. In either case, calibration data can be used to provide
corrections for the measured quantities.
SMART 1000 chambers are provided either with two antennas covering the
entire frequency range of 1 to 40 GHz or with two identical antennas from
1 to 18 GHz (one transmit and one receive). The chamber is calibrated at the
factory and supplied with the chamber calibration factors based on the
IEC61000-4-21 method.