Equipment - Agilent Technologies E4416A Service Manual

by using the following assumptions:
2
V – V
0
The error in doing this is:
(
– V
So if 2V
ignored. In practice
0.01%.
By substituting equation 3 into equation 1 and manipulating the result you get:
0 =
This quadratic can be solved to give equation 2.
The definitions of the terms in equation 2 are:
• V is the voltage measured between V
0
and after the Agilent 432A has been zeroed.
• V is the voltage measured between V
1
power is approximately 1 mW.
• V
comp
ground with power applied.
• R is the resistance of the mount resistor in the Agilent 432A power meter
• Calibration Factor is the value of the thermistor mount at 50 MHz.

Equipment

• Test power meter: Agilent 432A.
• Thermistor Mount: Agilent 478A Option H75 or H76.
• Digital Voltmeter (DVM): Agilent 3458A.
E4416A/E4417A Power Meters Service Guide
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2 2
( )
= – V – V
1 1 0
2 2 2
) (
+ V – 2V V – V – V
1 0 1 0 0
( ) 2V (
V – V « V –
0 1 0 co mp 1
∼
V 4Volts
c omp
2
( ) (
V – V – 2V V
1 0 comp 1
is the voltage between the Agilent 432A V
2 2
)
= – 2V + 2V V =
1 0 1 0
)
V , that is, V « V then the error can be
0 0 c omp
<
and V 400μV . The eror is less than
0
3 –
) ( )R CalibrationFactor (
– V + 4 10
0
and V with no power applied
comp RF
and V with power applied. This
comp RF
connector and chassis
comp
Adjustments 3
( )
2V V – V
0 1 0
)
67