Dc Log Ampli Er Adjustments - Agilent Technologies 8564EC Service Manual

3 . DC Log Amplifier Adjustments
There are three DC log adjustments; limiter phase, linear fidelity, and
log fidelity.
Assembly Adjusted
A4 log amp/cal oscillator
Related Performance Tests
IF Gain Uncertainty Scale Fidelity
Description
These three 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,
O, 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
Chapter 3
Manual Adjustment Procedures
3. DC Log Amplifier Adjustments
121