Technical data

4-9
Hardkey and Softkey Reference
DELTA LIMITS. sets the limits an equal amount above and below a specified middle value, instead of setting upper and
lower limits separately. This is used in conjunction with MIDDLE VALUE or MARKER → MIDDLE, to set limits for
testing a device that is specified at a particular value plus or minus an equal tolerance. For example, a device may be
specified at 0 dB ±3 dB. Enter the delta limits as 3 dB and the middle value as 0 dB.
DENOMIN: B1. the first order coefficient in the denominator of the response versus frequency polynomial equation.
DENOMIN: B2. the second order coefficient in the denominator of the response versus frequency polynomial equation.
DENOMIN: B3. the third order coefficient in the denominator of the response versus frequency polynomial equation.
DENOMIN: B4. the fourth order coefficient in the denominator of the response versus frequency polynomial equation.
DIRECTORY SIZE. lets you specify the number of directory files to be initialized on a disk. This is particularly useful with
a hard disk, where you may want a directory larger than the default 256 files, or with a floppy disk you may want to
reduce the directory to allow extra space for data files. The number of directory files must be a multiple of 8. The
minimum number is 8, and there is no practical maximum limit. Set the directory size before initializing a disk.
DISK UNIT NUMBER. specifies the number of the disk unit in the disk drive that is to be accessed in an external disk
store or load routine. This is used in conjunction with the GPIB address of the disk drive, and the volume number, to
gain access to a specific area on a disk. The access hierarchy is GPIB address, disk unit number, disk volume number.
DISP MKRS ON off. displays response and stimulus values for all markers that are turned on. Available only if no marker
functions are on, for example MKR STATS.
Display. provides access to a series of menus for instrument and active channel display functions. The first menu
defines the displayed active channel trace in terms of the mathematical relationship between data and trace memory.
Other functions include auxiliary channel enabling, dual channel display (overlaid or split), display intensity, color
selection, active channel display title, and frequency blanking.
DISPLAY: DATA. displays the current measurement data for the active channel.
DISPLAY: DATA and MEMORY. displays both the current data and memory traces.
DISPLAY: MEMORY. displays the trace memory for the active channel. This is the only memory display mode where the
smoothing of the memory trace can be changed. If no data has been stored in the active memory, a warning message is
displayed.
DISPLAY TESTS. leads to a series of service tests for the display.
DO BOTH FWD + REV. activates both forward and reverse measurements of selected calibration standards.
DO BOTH FWD THRUS. activates both forward measurements (reflection and transmission) of the thru standard from
the selective enhanced response calibration menus.
DO BOTH REV THRUS. activates both reverse measurements of the thru standard S22/S12 from the S11/S21 selective
enhanced response calibration menus.
DO SEQUENCE. has two functions: 1) It shows the current sequences in memory. To run a sequence, press the softkey
next to the desired sequence title. 2) When entered into a sequence, this command performs a one-way jump to the
sequence residing in the specified sequence position (SEQUENCE 1 through 6). DO SEQUENCE jumps to a softkey
position, not to a specific sequence title. Whatever sequence is in the selected softkey position will run when the DO
SEQUENCE command is executed. This command prompts the operator to select a destination sequence position.
DONE 1-PORT CAL. finishes one-port calibration (after all standards are measured) and turns error correction on.
DONE 2-PORT CAL. finishes two-port calibration (after all standards are measured) and turns error correction on.
DONE FWD ENH. RESP. finishes the transmission portion of the enhanced response calibration.
DONE LOADS. finishes all the load standards when the cal kit defines more than one load standard.
DONE OPENS. finishes all the open standards when the cal kit defines more than one open standard.
DONE SHORTS. finishes all the short standards when the cal kit defines more than one short standard.
DONE RESP ISOL'N CAL. finishes response and isolation calibration (after all standards are measured) and turns error
correction on.
DONE REV ENH. RESP. finishes the transmission portion of the enhanced response calibration.
DONE SEQ MODIFY. terminates the sequencing edit mode.
DONE TRL/LRM. finishes TRL/LRM two-port calibration (after all standards are measured) and turns error correction