Acterna SPM-32A - Inputs, Input Impedances (Z;W)

4-22
4.2 Operation and features SPM-32A ... SPM-36A
4.2.2 Inputs, input impedances (Z/
Ω
)
Note: The instrument has various input impedance options;
the 150 Ω input impedance can be replaced by
impedances of 120, 124, or 140 Ω. The following
deals with the 150 Ω version of the instrument, but
applies in principle to the other versions.
With the instrument you have the choice of 2 selectable
inputs:
• Coaxial input:
Input impedances: 75 Ω or
∞
(> 6.5 kΩ).
• Balanced input
Input impedances: 75 Ω, 150 Ω, 600 Ω or ∞
(>13 kΩ).
Only one input should be selected at any one time
Selecting the input and the input impedance
The input and the input impedance are selected together:
»
WARNING +30 dBm
«
The input level (a.c+d.c)
must not exceed
1W or +30 dBm
Max. d.c. input voltage=
60 V
from Z
out
≥ 600 Ω
21
Z/∞
BAL/UNBAL
3
75 600150
150