Fluke 6060B Instruction Manual page 148

MAINTENANCE
CALIBRATION ADJUSTMENTS
oscillator is adjusted for a stable display on the oscilloscope at both upper and lower
limits. The external reference input level to the Generator is reduced to determine
sensitivity.
PROCEDURE
a. Remove the top Generator cover and the 10-M Hz adjustment access screw
b. Connect the frequency standard to the reference input of the LFSSG.
c. Connect the LFSSG output to the oscilloscope vertical input channel ! using a
d. Connect the UUT rear panel 10 M Hz OUT to oscilloscope vertical input
e. Program the LFSSG to 10 M Hz and 0 dBm.
f.
g. Set the vertical controls of the oscilloscope to display both the LFSSG output
h. Edit the LFSSG to 200 Hz above 10 M Hz (10.0002 M Hz).
J .
k. Edit the LFSSG to 100 Hz below 1 0 MHz (9.9999 M Hz).
L
m. Program the LFSSG to 10 M Hz.
o. Increase the LFSSG level until the oscilloscope display first indicates the
p. Perform Reference Frequency Adjustment procedure on page 4C-I l of this
4C-16
from the the module plate. (See Figure 4C-3 C240 for 10-MHz adjustment
location.)
BNC tee, and then connect the cable to the UUT I 0 MHz I N using a cable less
than three feet in length.
channel 2.
Set the UUT rear panel REF INT/EXT switch to EXT.
and the UUT 10-MHz signal. Set the triggering to channel ! , and adjust the
timebase for O. l usjdiv.
If the signals are unlocked, adjust C240 for a locked condition. Verify the
UNCAL indicator is not lit.
Adjust C240 clockwise until the two waveforms are not synchronized (break
lock). Verify the UNCAL indicator is flashing. Turn C240 counterclockwise to
the first stable, locked point.
Verify Locked Condition: Two wave forms synchronized and UNCAL
indicator is not lit_
Reduce the level of LFSSG until the signals displayed on the oscilloscope
locked-point. Verify that this level is less than 300 mY peak-to-peak as
measured with the oscilloscope.
manual.