HP 3326A Operating And Reference Manual page 19

Selectmg an Operating Mode
In the 2 TONE mode, the channel B frequency tracks changes to the channel A fre-
quency (see Figure 1-5). The maximum frequency difference between channel A and
channel B is 100 kHz. Amplitude, dc offset, external amplitude modulation, sine wave
output, and square wave output are independent for each channel.
HP-IB Examples:
"MODE3"
or
"MODE TWOT"
STEP 1
STEP
2
STEP 3
STEP 4