Technical data

4-4
Hardkey and Softkey Reference
ASSERT SRQ. sets the sequence bit in the Event Status Register, which can be used to generate an SRQ (service
request) to the system controller.
AUTO FEED ON off. turns the plotter auto feed function on or off when in the define plot menu. It turns the printer auto
feed on or off when in the define print menu.
AUTO SCALE. brings the trace data in view on the display with one keystroke. Stimulus values are not affected, only
scale and reference values. The analyzer determines the smallest possible scale factor that will put all displayed data
onto 80% of the vertical graticule. The reference value is chosen to put the trace in center screen, then rounded to an
integer multiple of the scale factor.
AUX CHAN on OFF. enables and disables auxiliary channels 3 and 4.
AUX OUT on OFF. allows you to monitor the analog bus nodes (except nodes 1, 2, 3, 4, 9, 10, and 12) with external
equipment. To do this, connect the equipment to the AUX INPUT BNC connector on the rear panel.
AVERAGING FACTOR. makes averaging factor the active function. Any value up to 999 can be used. The algorithm used
for averaging is:
where
A(n) = current average
S(n) = current measurement
F = average factor
AVERAGING on OFF. turns the averaging function on or off for the active channel. “Avg” is displayed in the status
notations area at the left of the display, together with the sweep count for the averaging factor, when averaging is on.
The sweep count for averaging is reset to 1 whenever an instrument state change affecting the measured data is made.
At the start of the averaging or following AVERAGING RESTART, averaging starts at 1 and averages each new sweep
into the trace until it reaches the specified averaging factor. The sweep count is displayed in the status notations area
below “Avg” and updated every sweep as it increments. When the specified averaging factor is reached, the trace data
continues to be updated, weighted by that averaging factor.
AVERAGING RESTART. averaging starts at 1 and averages each new sweep into the trace until it reaches the specified
averaging factor. The sweep count is displayed in the status notations area below “Avg” and updated every sweep as it
increments.
Avg. is used to access three different noise reduction techniques: sweep-to-sweep averaging, display smoothing, and
variable IF bandwidth. Any or all of these can be used simultaneously. Averaging and smoothing can be set
independently for each channel, and the IF bandwidth can be set independently if the stimulus is uncoupled.
B. measures the absolute power amplitude at input B.
B/R. calculates and displays the complex ratio of input B to input R.
B SAMPLER lw/RF. manually sets the RF switch in the lightwave test set, which feeds directly to the B sampler. The
switch toggles between the OPTICAL RECEIVER INPUT port of the lightwave test set and the electrical PORT 2 of the
instrument. If COUPLED SW is set to ON, the B SAMPLER setting will revert back to the default position at the end of
the sweep.
BACK SPACE. deletes the last character entered.
BACKGROUND INTENSITY. sets the background intensity of the LCD as a percent of white. The factory-set default value
is stored in non-volatile memory.
BANDWIDTH. in the Marker Search menu, this key turns on the search for the 3 dB bandwidth point on the high side of
the reference marker. You must first place the reference marker (marker 1), and then press BANDWIDTH . This search
is intended for lowpass devices. In the Marker Function menu, this key turns on the bandwidth search feature and
calculates the center stimulus value, bandwidth, and Q of a bandpass or band-reject shape on the trace. This search is
intended for bandpass devices.
BANDWIDTH LIMIT. selects the bandwidth limit line choice. This selection leads to the menu used to define and test
bandwidth limits of a bandpass filter.
BANDWIDTH VALUE. sets the magnitude value that defines the passband or rejectband of BANDWIDTH.
BEEP DONE ON off. toggles an annunciator which sounds to indicate completion of certain operations such as
calibration or instrument state save.
An() Sn() Sn 1–()... Sn F–1+()+++[]F⁄=