DMTA-10040-01EN, Rev. E, February 2018
Control Functions 83
To enable the fine-knob function, press the Enter key ( ) when ANGLE is
highlighted. The fine-knob function can be used to adjust the angle more precisely.
ANGLE will be underlined when this function is enabled. The angle can then be
changed in 0.1 degree increments. To turn off the fine-knob function, press one
more time.
GAIN
Gain is adjustable from 0.0 dB to 100.0 dB. The displayed gain setting is adjusted
in 0.1 dB steps. At full gain (100 dB), with the instrument’s probe drive set to
MEDIUM, instrument sensitivity is 10 V/Ω, as measured at the rear panel
horizontal and vertical outputs. In other words, ten screen divisions represents an
impedance change of one ohm on the display.
Gain can be adjusted independently in the horizontal or vertical direction, or in
both directions simultaneously. The primary method of adjusting gain is by
turning the knob. However, gain may also be adjusted by using the knobless
function (for more details, see “Knobless Entry” on page 78).
To adjust the horizontal and vertical gain simultaneously, press the MAIN FILTER
menu key ( ), followed by the C key. The gain may then be adjusted with the
knob. The selected value will be applied to both the horizontal and the vertical
gain, and the difference between the horizontal and vertical gains will remain
constant; they will increase or decrease at the same rate.
To adjust the horizontal gain only (without changing the vertical gain), press the
MAIN FILTER menu key ( ), followed by the D key. The knob will then adjust
only the horizontal gain. To adjust only the vertical gain, press the E key. The
knob will then adjust only the vertical gain.
To speed up the gain selection process (while the combined horizontal and vertical
gain, horizontal gain, or vertical gain function is highlighted), press once. This
enables the coarse-knob function. GAIN, H GAIN, or V GAIN will be underlined
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