Stanford Research Systems SR844, User Manual

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Scan - Rel 3-37
SR844 RF Lock-In Amplifier
appropriate for different configurations. Using stored Rel Values at a scan frequency will also
recall the stored measurement configuration .
The measurement configuration includes:
•
Signal Z-In
•
Sensitivity
•
Wide Reserve
•
Close Reserve
•
Phase (if R
θ
Rel Values are stored)
•
Ratio
•
Time Constant Slope (but not the Time Constant)
Other parameters, such as Display, Expand and AUX OUT values are not included.
Press Rel Mode to turn REL MODE on. In this mode, stored Rel Configurations and Values are
automatically recalled at the current scan frequency (if previously stored, as indicated by XY READY or
R[dBm]
θθθθ
) . When a Rel Configuration is recalled, the
REL
indicators within the CH1 and CH2 displays
are turned on. The
XYOffs
and
ROffs
indicators within the displays are turned on and off as appropriate.
After a Rel Configuration is recalled, changing the measurement configuration or modifying offsets causes
the
REL
indicators to turn off. This does not alter the stored Rel Values or Configuration, it merely
indicates that the current configuration is not the same as the stored configuration. It also does not alter the
offsets currently in use. Use Rel Mode to toggle REL MODE off and back on to recall the stored Rel
Values and Configuration once again.
Changing frequency scan parameters clears all stored Rel Values. Use the CLEAR ALL key ( Shift–Rel
Mode
) to clear all stored Rel Configurations and Values and
CLEAR ONE (Shift–Start/Step)
to clear
the Rels at the current scan frequency only.
The Rel Values are saved when the instrument power is turned off. They are not stored with the 9
available stored setups.
Store XY Performs Auto Offset on both X and Y and stores the XY offsets as XY Rel Values at
the current scan frequency. X and Y displays and outputs are offset to zero. Any
previously stored XY Rel Values are replaced. The current measurement configuration is
also saved. Previously stored R
θ
Rel Values are discarded if they were stored with a
measurement configuration which differs from the current one.
The XY READY indicator turns on indicating that XY Rel Values are stored for this
scan frequency.
Store
R[dBm]
θ
[
Shift–
Store XY]
Performs Auto Phase and Auto Offset on R[dBm] and stores the R[dBm] offset and
reference phase as R
θ
Rel Values at the current scan frequency. R[dBm] and
θ
displays
are offset to zero. Any previously stored R
θ
Rel Values are replaced. The current
measurement configuration is also saved. Previously stored XY Rel Values are
discarded if they were stored with a measurement configuration which differs from the
current one.
The
R[dBm]
θθθθ
indicator turns on indicating that R
θ
Rel Values are stored for this scan
frequency.