23–
9.4 Relation between the reference level and ATT · AMP (in dBm indication)
The programmable attenuator (ATT) and the input amplifier (AMP) inside 2650/2652/2658 are automatically
set according to the setting value of the reference level (REFER).
(ATT cannot be set independently.)
* When the input signal level is higher than the suitable level for 1st mixer’s terminal, it generates
harmonics distortion and spurious. 2650/2652/2658 is designed so that the input signal level of 1st mixer
is determined to proper level by the reference level.
9.5 Setting the offset level
1. to set the offset of reference level.
When amplifier and attenuator are used externally, display level can be matched by offset.
The setting range is from -50.0 to 50.0dB (0.1dB step).
Offset is calculated to the reference level, and it is displayed.
* When offset is set, it is displayed on LEVEL display area as “OFS”.
Furthermore, the value of a marker point is displayed reflecting the calculated offset.
* Offset of dBµV, dBmV, dBV, W, etc. are changed automatically.
REFER
(dBm)
ATT
(dB)
AMP
(dB)
REFER
(dBm)
ATT
(dB)
AMP
(dB)
REFER
(dBm)
ATT
(dB)
AMP
(dB)
REFER
(dBm)
ATT
(dB)
AMP
(dB)
10 25 0 -3 12 0 -16 20 21 -29 7 21
9 24 0 -4 11 0 -17 19 21 -30 6 21
8 23 0 -5 10 0 -18 18 21 -31 5 21
7 22 0 -6 9 0 -19 17 21 -32 4 21
6 21 0 -7 8 0 -20 16 21 -33 3 21
5 20 0 -8 7 0 -21 15 21 -34 2 21
4 19 0 -9 6 0 -22 14 21 -35 1 21
3 18 0 -10 5 0 -23 13 21 -36 5 26
2 17 0 -11 4 0 -24 12 21 -37 4 26
1 16 0 -12 3 0 -25 11 21 -38 3 26
0 15 0 -13 2 0 -26 10 21 -39 2 26
-1 14 0 -14 1 0 -27 9 21 -40 1 26
-2 13 0 -15 0 0 -28 8 21
F5
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