4-24
4.2 Operation and features SPM-32A ... SPM-36A
The following key is use to select the input impedance
(75, 150, 600 Ω or "∞")
When this key is pressed the ohmic part of the input
impedance is disconnected from the input connector leaving
only the high impedance of the input amplifier (> 6.5 kΩ or
>13 kΩ resp.)
A small square at the right-hand edge of the display shows
whether "Z" or "∞" has been selected.
Fig. 4-5 Examples illustrating input selection
Left: Coaxial input, Z
in
= 75 Ω
Right: Balanced input, high impedance (∞)
1
1
The simultaneously marked impedance value is needed
during dBm display for power computation. During dB
display, it is irrelevant.
Z/∞
150
150
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