1b-48
Operation Reference
Function
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
ATTN HOLD 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
ATTN HOLD is selected. However, amplitude settings that exceed the limits may not
provide output levels that are within the accuracy specifications of the instrument.
3. RF OUTPUT
The following table shows the reverse power protection for the RF output port of each
instrument model. When the instrument senses a reverse-power signal, it turns the RF
output off, the step attenuator to maximum attenuation, and the vernier to its lowest
setting. A message appears in the second line of the display when the reverse power
protection has been activated.
After you have removed the reverse-power signal from the RF output, press the
RF ON/OFF
key to turn the output signal on again.
10 dB Specified Vernier Ranges
Range Upper and Lower Limits
1
+10.0 dBm
a
to −5.9 dBm
a. +13 dBm for 8648B/C/D
2 −6.0 dBm to −15.9 dBm
3 −16.0 dBm to −25.9 dBm
4 −26.0 dBm to −35.9 dBm
5 −36.0 dBm to −45.9 dBm
6 −46.0 dBm to −55.9 dBm
7 −56.0 dBm to −65.9 dBm
8 −66.0 dBm to −75.9 dBm
9 −76.0 dBm to −85.9 dBm
10 −86.0 dBm to −95.9 dBm
11 −96.0 dBm to −105.9 dBm
12 −106.0 dBm to −115.9 dBm
13 −116.0 dBm to −127.0 dBm
14 −127.1 dBm to −136.0 dBm
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