Agilent Technologies 856290216 service manual DC Log Amplifier Adjustments

5. 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, 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

	TEST CABLE
	----------------------,
:	I
	S P E C T R U M I
I

I

SK16

Figure 2-9. DC Log Adjustment Setup

2-30 Adjustment Procedures