Reference Section - Stanford Research Systems SR844 User Manual

Reference Section

The Reference Section of the front panel contains the Reference
Display, connectors for the External Reference Input and for the
Reference Out, and several keys and indicators. The knob is also
located here. The display and keys are discussed below.
Reference The Reference Display is a 4-½ digit LED display that shows the following features:
Display
Key
Phase
Freq
PRECISE
FREQ
I.F.
AuxOut
CH1/CH2
Offset Modify
SETTLE...
Scan Set
Scan Set
Scan Set
Note 1
Display
Reference Phase
Reference
Frequency
Precise
Reference
Frequency
IF Frequency
AUX OUT 1, 2
Offset
Elapsed Time
Scan Start
Scan Stop
Scan Steps
See the description of Scan and Rel later in this chapter for more details.
Reference Section
Knob Adjust? Description
Yes The detection phase relative to
the reference (deg).
Only in Internal The detection frequency.
Reference Mode
Only in Internal Displays the reference
Reference Mode frequency on the Channel 2
and Reference Displays with
extra precision.
Only in Internal The IF (chop frequency) used
Reference Mode in the SR844, provided for
information.
Yes The rear panel Aux Output
voltages.
Yes The offset (% f.s.) for the CH1
or CH2 display quantity.
No Time constants elapsed.
Yes The start frequency for manual
scanning. Note 1
Yes The stop frequency for manual
scanning. Note 1
Yes The number of frequency steps
for manual scanning. Note 1
SR844 RF Lock-In Amplifier
3-27