Teledyne LeCroy DA1855A - Manual (Page 79)

Operator’s Manual
922258-00 Rev A 73
b. Connect a BNC cable from the Frequency Reference Signal Output of the leveled
sine wave generator to the External Trigger Input of the oscilloscope. (If the sine
wave generator does not have a Frequency Reference Signal Output, insert a BNC
Tee adapter into the Output connector and attach the External Trigger BNC cable to
the BNC Tee.)
Figure 20, LF CMRR Check Setup
c. Set the oscilloscope to display channel 1, vertical scale to 5 V/div and time base to
10 ms/div.
d. Set the sine wave generator frequency to 70 Hz.
e. Set the high amplitude output of the sine wave generator to exactly 20 Vp-p (4
divisions). Adjust the oscilloscope trigger level as necessary for a stable display. Take
care not to alter the sine wave generator settings during the following steps.
f. Remove the sine wave generator output cable from the oscilloscope input.
g. Connect the open end of this cable to the female to female BNC adapter, a BNC ‘Y”
and a 6” BNC cable to each end of the BNC ‘Y”.
h. Connect the two free ends of the 6” BNC cables to the +INPUT and –INPUT of the
DA1855A. Refer to Figure 21.
i. Verify that both the +INPUT and –INPUT of the DA1855A are set to DC.
j. Connect another BNC cable from the AMPLIFIER OUTPUT on the DA1855A under
test to channel 1 of the oscilloscope.