Chapter 13 609
Softkey Descriptions
Softkey Descriptions
SWEEP TIME DAC Sweep-Time DAC
DESCRIPTION Displays the output of the sweep-time DAC, SWP_DAC,
from the sweep-ramp generator on the A7 analog
interface assembly. The top graticule represents +10 V
and the bottom represents −10 V.
The sweep times are grouped into three ranges.
• 20 milliseconds to less than 300 milliseconds.
• 300 milliseconds to less than 6 seconds.
• 6 seconds to 100 seconds.
Within each range, a negative voltage is displayed and
becomes more negative as the sweep time is decreased.
Refer to Chapter 4 for additional troubleshooting
information.
R
ELATED SOFTKEYS SWEEP RAMP
VERIFY TIMEBASE Verify Timebase
DESCRIPTION Note that instruments equipped with Precision
Frequency Reference do not use this softkey function.
Allows the DAC value for the 10 MHz timebase to be
changed temporarily. Either the −37 Hz or the
−2001 Hz passcode must be entered to activate this
function.
This function is used to verify the settability
specification for the timebase. Refer to the 10 MHz
reference accuracy verification test in the calibration
guide for your instrument.
R
ELATED SOFTKEYS CAL TIMEBASE
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