HP 8970B Service Manual page 12

Block Diagram and Parts List
Front End
Figure 1-3: Schematic Representation of Input Assembly
PAD 1
Limiter
10 dB
PAD
Limiter (on 08970-60125
Input Assembly only).
This is a schematic representation of the RF input assembly. The amplifier section and
each and each of the attenuator sections are switchable by the control lines.
On units using the Input Assembly 08970-60125, the Limiter suppresses externally
generated transients.
In Figure 1-1 the numbers in brackets inside the input assembly refer to the wire colors.
The numbers at the side of the second convertor refer to the wire colors attached to the
connector which connects up to the second convertor.
1-4
20 dB PAD 2
Amp
20 dB 10 dB
AMP PAD
PAD 3
10 dB
PAD
HP 8970B Option 020 Service Manual Supplement
2dB
3 GHz
PAD
LPF