Front Panel Operation 5
SR620 Universal Time Interval Counter
CHOOSING THE OUTPUT DISPLAY
The SR620 can display statistical information
about the measurement of N samples. The
SR620 computes and reports the mean, standard
deviation or root Allan variance, minimum, and
maximum values seen during the measurement.
The equation for the statistical functions are given
by:
SETTING THE FRONT PANEL DISPLAY
The DISPLAY up and down arrow keys control
what is displayed on the 16 digit LED display. All
of the statistical data is always calculated and may
be viewed by scrolling through the displays. The
settings are:
MEAN
: displays the mean value of the
measurement. If the display is prefaced by "r"
then a relative reading is displayed and the value
displayed is the mean minus the REL.
REL
: displays the value of the REL. The REL is
set by pressing the "SET" button and is cleared by
pressing the "CLR" button. Normally the REL is
set to the value of the mean when the "SET"
button is pressed. However, the REL may be set
to an arbitrary value using the ZOOM feature
described in the GRAPHICS ZOOM section below.
Pressing the "CLR" button with the REL off clears
the display.
JITTER
: displays either the standard deviation
(display prefaced by "d") or Allan variance (
display prefaced by "A"). The statistic that is used
is set in the CONFIGURATION MENU.
MAX
: displays the maximum sample found in this
measurement. If the display is prefaced by "r"
then a relative reading is displayed and the value
displayed is the max minus the REL.
MIN
: displays the minimum sample found in this
measurement. If the display is prefaced by "r"
then a relative reading is displayed and the value
displayed is the min minus the REL.
TRIG
: displays the trigger level set by the EXT, A,
and B trigger knobs (The full scale range of the
knobs may be set in the CONFIGURATION
MENU.).
DVM
: displays the voltage values at the rear panel
DVM inputs.
Pressing both the up and down arrow keys
together toggles the
x1000
expand on and off in
frequency and period mode. In frequency mode
the x1000 expand moves the decimal point 3
places to the left and displays frequencies with
nHz resolution. The maximum frequency
measurable in this mode is 1 MHz. In period
mode the x1000 expand moves the decimal point
3 places to the left and displays periods with fs
Содержание SR620
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Страница 6: ...iv Table of Contents SR620 Universal Time Interval Counter...
Страница 8: ...vi Safety and Preparation for Use SR620 Universal Time Interval Counter...
Страница 12: ...x Specifications SR620 Universal Time Interval Counter...
Страница 58: ...42 Programming Commands SR620 Universal Time Interval Counter...
Страница 72: ...56 Programming Examples SR620 Universal Time Interval Counter...
Страница 76: ...60 Troubleshooting Tips SR620 Universal Time Interval Counter...
Страница 82: ...66 Performance Test SR620 Universal Time Interval Counter...
Страница 90: ...74 Calibration Procedure SR620 Universal Time Interval Counter...
Страница 102: ...86 Circuit Description SR620 Universal Time Interval Counter...
Страница 124: ...108 Parts List SR620 Universal Time Interval Counter...