HP 8560A

5. DC Log Amplifier Adjustments
5. DC Log Amplifier Adjustments
There are three DC Log adjustments; Limiter Phase, Linear Fidelity, and Log Fidelity.
These adjustment need only be done under the following conditions:
Limiter Phase Only if a repair is made to blocks F, G, H, I, or J.
Linear Fidelity
Only if a repair is made to blocks C, D, F, G, H, I, J, K, 0, IF Gain
Accuracy, RBW switching, or Log Fidelity.
Log Fidelity Only if a repair is made to blocks D, F, H, K, IF Gain Accuracy, RBW
switching, or Log Fidelity.
If multiple adjustments are required they should be done in the following order:
1. Limiter Phase
2. Linear Fidelity
3. Log Fidelity
All adjustments should be made with all of the shields on and only after allowing at least a
20-minute warm up.
Assembly Adjusted
A4 Log Amplifier
Related Performance Tests
IF Gain Uncertainty Test
Scale Fidelity Test
Equipment
Frequency Synthesizer
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3335A
Adapters
Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1476
Cables
BNC,122 cm(48in)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A
Test Cable
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...85680-60093
A4 Limiter Phase Adjustment
This adjustment consists of adjusting A4R445 for maximum on screen amplitude under the
following conditions.
Adjustment Procedures 2-29