Stanford Research Systems SR620, Руководство пользователя

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Configuration Menus 17
SR620 Universal Time Interval Counter
CONFIGURATION MENUS
The SR620 has many control parameters that are
rarely , if ever, adjusted. These parameters are
set in the SR620's four configuration menus. The
configuration menus are accessed by pressing
either the "SET" or "SEL" keys in the CONFIG
section of the front panel. The submenu selection
line then appears and one may choose the
submenu of interest by pressing the "SEL" key.
The currently selected submenu name will flash.
Pressing the "SET" key will then scroll through the
lines of the selected submenu. Pressing the "SEL"
key will return one to the submenu selection
line.The parameters displayed in each submenu
line may be adjusted by pressing either the "scale"
or the "sample size" up and down arrow keys. The
appropriate keys will always be under the
parameter of interest. Pressing any other keys will
return one to the normal data display. The four
submenus are:
Configuration Menus
ctrl
Control: GPIB and RS-232 data.
cAL Calibration data, Clock source.
out Output: graphs, printer/plotter, DVM
scales, Jitter,gate scale,trigger scale.
Scn Scan menu: #points, dwell, D/A and delay
control.
Note : The default parameter values for all settings
will be recalled if the RESET button in the
SAMPLE SIZE section is held down when the unit
is turned "ON". This will also recall the factory
calibration values.
CONTROL MENU (ctrl)
The control menu allows the communications
interfaces to be configured. The GPIB address
and RS-232 baud rates are set with this menu.
The first line of this menu will display the
characters received from the controller in
ASCII(Hex). The up/down keys in the SCOPE
AND CHART section may be used to scroll
through the last 256 characters received. A period
after the right-most digit indicates the last
character received by the unit.
The RS-232 baud rate may be set from 300 to
19.2k baud. If the RS-232 echo is enabled, every
character sent to the SR620 will be echoed back
to the sender. Use this only when using the SR620
with a "dumb" terminal. DO NOT USE THE ECHO
WHEN CONNECTED TO A COMPUTER,
EXCEPT WHEN RUNNING A TERMINAL
EMULATION PROGRAM!!
An RS-232 dwell delay is available to interface to
slow computers. Each unit of delay corresponds to
about 2 ms of delay between characters. Add
delay if you experience problems when using the
SR620 via the RS-232.
Note: The RS-232 characteristics set here will not
affect the RS-232 port as used with a plotter. The
port will transmit at 9600 baud, 8 data bits and no
parity when used with a plotter.
Control Menu Items
Line Default Display Comments
1
dAtA 00 00 00 00. ASCII(Hex) of data from
controller.
2 AddrESS 16 GPIB Address.
3 rS 232 bAud 9600 RS-232 baud rate.
4 rS 232 Echo oFF Turn Echo "ON" if used
with terminal.
5 rS 232 bitS 8 Select 7 or 8 data bits
per character.
6 rS 232 PAr nonE Parity bit control: select
even, odd or none.
7 rS 232 dLy 0 Dwell time (x2 ms)
between characters.
CALIBRATION MENU (cAL)
This menu is used to calibrate the instrument and
to select the source for the timebase.
Calibration and Clock Source Menu
Line Default Display Comments
1 Auto cAL
Press "START" key for
Autocal procedure.
2 cLoc SourcE int Select Timebase source
(int/rear).
3 cLoc Fr -------- Specify Ext timebase
frequency (5/10 MHz).
4 cALdAt 000 01947 Access to 180
calibration words.
The "Autocal" procedure is used to null insertion
delay differences between the start and stop