Novatech 409B Instruction Manual page 10

Adjust Y2 using a non-metallic adjustment tool for
10.000000 MHz, ±7.5 Hz.
NOTE:
If your unit has the /R option installed, the access to
R22 is blocked by the module. Remove the two
screws securing the module and carefully reposition
the module to allow access to R22.
7.5 Amplitude Adjust, R22. Connect the output of
channel 0 to the oscilloscope set to measure ampli-
tude, with a minimum of 16 averages. Set for 50 Ω
termination. Set the output to 35 MHz by sending
the command "F0 35.0000000". Adjust R22
for 1.00 Vpp ±0.075 Vpp. This completes the cali-
bration of the Model 409B.
NOVATECH INSTRUMENTS 10 409B Manual, 17-Apr-2015