Stanford Research Systems SR844, User Manual

Page: 122 / 246

4-20 Auto Functions
SR844 RF Lock-In Amplifier
Auto Functions
AWRS
The
AWRS
command performs the Auto Wide Reserve function. This command is
the same as pressing Shift–WideReserveDown .
AWRS
automatically sets the
Wide Reserve Mode of the instrument to the minimum reserve without overload.
ACRS
The
ACRS
command performs the Auto Close Reserve function. This command is
the same as pressing
Shift–CloseResrv
.
AGAN
The
AGAN
command performs the Auto Sensitivity function. This command is the
same as pressing
Shift–SensUp
.
AGAN
automatically sets the Sensitivity of the
instrument.
This function may take some time if the time constant is long. This function does
nothing if the time constant is greater than one second. Check the Interface Ready
bit (bit 1) in the Serial Poll Status to determine when the command is finished.
APHS
The
APHS
command performs the Auto Phase function. This command is the same
as pressing
Shift
−
Phase
. This command adjusts the reference phase so that the
current measurement has a Y value of zero and an X value equal to the signal
magnitude, R.
AOFF ch,q
The
AOFF ch,q
command automatically offsets the chosen quantity to zero. The
quantity is specified by its display channel
ch
and quantity
q
as per the table
above. Both parameters
ch
and
q
are required. This command is equivalent to
pressing the Auto Offset key.
ch,q Quantity
1,0 X
1,1 R[V]
1,2 R[dBm]
2,0 Y
Important!
Remember, Auto Offset X or Y performs Auto Offset on both X and Y.