80 Chapter2
Adjustment Procedures
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,
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
All adjustments should be made with all of the shields on and only after
allowing at least a 20-minute warmup.
Assembly Adjusted
A4 log amplifier
Related Performance Tests
IF Gain Uncertainty Scale Fidelity
Equipment
Frequency synthesizer .....................................................HP3335A
Adapters
Type N (m) to BNC (f) ......................................................1250-1476
Cables
BNC, 122 cm (48 in) ............. .........................................HP10503A
Test cable ....................................................................85680-60093
A4 Limiter Phase Adjustment
This adjustment consists of adjusting A4R445 for maximum on screen
amplitude under the following conditions.
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