128 16900A, 16902A, and 16903A Service Guide
8 Theory of Operation
Clock IN
This BNC input is specifically for a 10 MHz clock signal from
an oscilloscope or other source. The signal is AC coupled
and passed through a 10X multiplier part (low jitter) and
then fed to the FPGA as one of the 100 MHz clock source
choices. Using this input allows two measurement
instruments to run on the same time base and maintain
correct time alignment over long aquisitions.
Calibration OUT
This BNC output is a low frequency, 49 KHz, signal driven
from a LVTTL 50 Ω line driver. It is used by an external
Time Correlation Fixture to simultaneously trigger multiple
frames and oscilloscopes. This is then used with a software
averaging program to closely correlate the trigger point
across instruments.
16903A Front Panel Assembly
The identical front panel assembly is used on both the
16902A six- slot logic analyzer and the 16903A three- slot
logic analyzer. See “16902A/16903A Front Panel
Assembly" on page 114.
16903A Power Up Routine
The power up routine is the same on all frames. See
“16900A/16902A/16903A Power Up Routine" on page 115.
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