HP 8648 A/B/C/D - Changpuak.ch

RF output
RF Output
1. RF ON/OFF Press [-ON/OFF) to turn the RF output signal on or off. RF OFF
appears in the second line of the AMPLITUDE display when the
output signal is off.
The instrument turns off the output signal by switching in the
maximum output attenuation (130 dB) and setting the vernier to
its lowest setting. This results in approximately 170 dB of carrier
isolation.
2. ATTN HOLD Press [ATTN HOLD) to hold the step attenuator at its current setting.
HOLD appears in the second line of the AMPLITUDE display when the
attenuator hold function is on.
1 b-54 Operation Reference
When the attenuator hold function is on, amplitude adjustments are
limited to the range of the instrument’s vernier. The vernier provides
0.1 dB per step adjustment resolution across its specified 10 dB range.
Vernier Ranges
The following table, “10 dB Specified Vernier Ranges”, provides the
upper and lower limits of each vernier range. The instrument’s
amplitude setting when you press the C-1 key determines
which vernier range is used.
The vernier is allowed to over-range and under-range beyond the
limits shown in the table when @iYlXKKj is selected. However,
amplitude settings that exceed the limits may not provide output
levels that are within the accuracy specifications of the instrument.