4-5
Lock-in Parameters
Max
Fr= 100.00 Hz
Full Scale = 10 mV
Dyn Reserve = 0 dB 100 mS
12 dB/oct Line 2xLin AC A
X
X = 9.7284 mV± 10.000 e-3 0.0 V
Y
Y =-1.2050 mV± 10.000 e-3 0.0 V
Trace 2
Intrnl
Reserve
Filter dB/oct.
Sensitivity
10 mV f.s.
Manual
100 mS
1.2 Hz
6 12
18 24
60 dB gain
Synchronous
Off
< 200Hz
Time Constant
Min
Syncro
Harmonic= 1 LOCLOCK
Soft Key Definitions.
Pressing the corresponding
soft key will either highlight a
field or select an option.
Top
Display
Status and
activity
indicators
Soft Keys
Sensitivity and
Dynamic Reserve
Time Constant
and Slope
Input configuration
and signal filters
Bottom
Display
SCREEN DISPLAY
DEFAULT DISPLAY
The SR850's default display is shown above. This
is the display format in effect when the unit is
turned on.
This screen resembles a "normal" lock-in front
panel. The lock-in setup is displayed across the
top of the screen. The sensitivity, reserve, time
constant, prefilters and input configuration are all
easily visible. The upper numeric readout and bar
graph show the value of X (Rcos
θ
) and the lower
graph shows the value of Y (Rsin
θ
).
The bar graphs are normally scaled so that plus
full scale is at the right end, minus full scale is at
the left end, and zero is in the middle. Whenever
the sensitivity is changed, the bar graphs are
scaled to the full scale sensitivity. The
[AUTO SCALE] key will scale the active display to
the actual measured signal (the center remains
zero). The range and center of a bar graph may be
manually adjusted to expand a portion of the
scale.
Status indicators are displayed across the bottom
of the screen. These include the reference mode,
unlock alert, reference frequency, harmonic
detect, overloads, and GPIB/RS232 activity, error
and remote status.