Instructions

Page 20
4.5.3 Vertical Scaling
enables the vertical amplitude scaling to be changed. Creates a set of bottom-row
function keys as follows:
creates a pop-up menu enabling the vertical scaling to be set to 10dB/div (the
default) through to 1dB/div.
For scales below 10dB/div only a portion of the sweep amplitude will be
visible and the Shift Up/Shift down keys can be used to pan the trace
through the amplitude range of the graticule. These keys auto-repeat.
4.5.4 Amplitude Offset and Compensation Tables (when fitted)
enables the amplitude scaling to be offset to match external attenuation or gain, or
to add frequency dependent amplitude compensation tables to match transducers or
antennae. These functions are only available when the upgrade option U01 is fitted
- see section 6. Creates a set of bottom-row function keys as follows:
cancels any offset or compensations that have been set and returns the amplitude
scaling to normal.
opens a control menu that enables compensation for a 75 Ohm source impedance,
a fixed attenuation or gain, or a frequency dependent compensation table to be
used. The functions can be used individually or together.
The three keys on the upper line select which function
is to be controlled.
For 75 Ohm source, the options are only on or off.
For Fixed Offset, the Set Offset key creates a
dialogue box by which an offset can be set between
-50.0dB and +50.0dB. The set figure is added to the
displayed reference level and to the graticule values
and marker readout.
For Compensation Table, the Select Table key opens a file list of stored compensation tables
that can be loaded. See section 7.6.2 for a full explanation.
Whenever offsets or compensations are active, a warning message is displayed at the top right
of the graticule. See section 7.6.1 for safety warnings on the use of these function.
4.5.5 Amplitude Limits (when fitted)
sets one or two horizontal lines or complex patterns that can be compared with the
sweep. This function is only available when the upgrade option U01 is fitted - see
section 6. Creates a set of bottom-row function keys as follows:
creates a control screen that enables the selection of lines and patterns, or allows
existing ones to be turned on or off. When Set Line is pressed, the value can be
entered numerically in dBm or dBuV. When Select Pattern is pressed, a Recall File
screen is opened enabling a pattern to be loaded from a file. See section 7.7.1.
creates a pop-up menu that selects the criteria upon which a limit condition is
created. The options are None, Above, Below, Outside or Inside.
Scale/
Shift
Scale
Shift
Down
Shift
Down
Offset/
Tables
Clear
All
Set
Limits
Limit
Conditio
Set
Limits
Limit
Condition