Stanford Research Systems SR844, User Manual

Page: 96 / 246

3-38 Scan - Rel
SR844 RF Lock-In Amplifier
XY READY
R[dBm]
θθθθ
These indicators are on if there are XY or R
θ
Rel Values stored for the current scan
frequency. They do not imply that these Rel Values are being applied to the current
measurement.
Rel Mode
This key toggles
REL MODE
.
In
SCAN MODE
with
REL MODE
on, the instrument automatically recalls the stored
Rel Configuration and Rel Values at each scan frequency (if previously stored, as
indicated by
XY READY
or
R[dBm]
θθθθ
) . The
REL
indicator within the CH1 and CH2
displays is on whenever the recalled Rel Configuration and Rel Values are in effect.
If the current scan frequency does not have any stored Rel Values (as indicated by
XY READY
or
R[dBm]
θθθθ
) , the current configuration and offsets remain in effect. The
REL indicator is off in this case.
The stored XY Rel Values are applied as X and Y offsets (adjusted for the current
phase). The stored R[dBm] Rel Value is applied as the R[dBm] offset. The stored
θ
Rel
Value is applied as the Reference Phase (there is no phase offset). Offset indicators
within the CH1 and CH2 displays are turned on as appropriate (as well as the
REL
indicator).
Turning
REL MODE
off does not change the current measurement. The current
measurement configuration remains in effect. As long as
REL MODE
is off, stored Rel
Values and Configurations are not recalled at any other scan frequencies.
CLEAR ALL
[Shift–Rel
Mode] This key sequence discards all stored Rel Values and Configurations.
CLEAR ONE
[Shift–Start/
Step] This key sequence discards the stored Rel Values and Configurations at the current scan
frequency.
Any key that
changes the
instrument
configuration All keys in the SIGNAL INPUT and SENSITIVITY sections as well as Slope
Up/Down, Ratio, Recall, Preset, Ref Z-In, Ref Source
change the measurement
configuration and turn the REL indicators off. This does not affect REL MODE .
Start/Step
This key is used to step through the scan frequencies. If
REL MODE
is on, stored Rel
Configurations and Values (if previously stored) will be applied.