GW Instek GRF-1300A - Manual (Page 121)

Appendix
Resistor Values in π-type Resistance Attenuators
50Ω
50Ω
R1
R2
R3
dB R1 R2 R3
1 869.55 5.77 869.55
2 436.21 11.61 436.21
3 292.40 17.61 292.40
4 220.97 23.85 220.97
5 178.49 30.40 178.49
6 150.48 37.35 150.48
7 130.73 44.80 130.73
8 116.14 52.84 116.14
9 104.99 61.59 104.99
10 96.25 71.15 96.25
11 89.24 81.66 89.24
12 83.54 93.25 83.54
13 78.84 106.07 78.84
14 74.93 120.31 74.93
15 71.63 136.14 71.63
16 68.83 153.78 68.83
17 66.45 173.46 66.45
18 64.40 195.43 64.40
19 62.64 220.01 62.64
20 61.11 247.50 61.11
25 55.96 443.16 55.96
30 53.27 789.78 53.27
35 51.81 1405.41 51.81
40 51.01 2499.75 51.01
119