Keysight Technologies E4417A User Manual

Adjustments 3
Keysight E4416A/E4417A Power Meters Service Guide 79
by using the following assumptions:
The error in doing this is:
So if , that is, then the error can be
ignored. In practice and . The eror is less than 0.01%.
By substituting equation 3 into equation 1 and manipulating the result you get:
This quadratic can be solved to give equation 2.
The definitions of the terms in equation 2 are:
–V
0
is the voltage measured between V
comp
and V
RF
with no power applied and
after the Keysight 432A has been zeroed.
–V
1
is the voltage measured between V
comp
and V
RF
with power applied. This
power is approximately 1 mW.
–V
comp
is the voltage between the Keysight 432A V
comp
connector and chassis
ground with power applied.
– R is the resistance of the mount resistor in the Keysight 432A power meter
– Calibration Factor is the value of the thermistor mount at 50 MHz.
Equipment
– Test power meter: Keysight 432A.
– Thermistor Mount: Keysight 478A Option H75 or H76.
– Digital Voltmeter (DVM): Keysight 3458A.
V
0
2
V
1
2
– V
1
V
0
–()
2
–=
V
1
2
V
0
2
2V
1
V
0
–+
⎝⎠
⎛⎞
– V
0
2
V
1
2
–
⎝⎠
⎛⎞
– 2V
0
2
– 2V
1
V
0
+2V
0
V
1
V
0
–()==
2V
0
V
1
V
0
–()2V
comp
V
1
V
0
–()«
V
0
V
comp
«
V
comp
4Volts~
V
0
400 μ V<
0 V
1
V
0
–()
2
2V
comp
V
1
V
0
–()– 410
3–
()RCalibrationFactor()+=

Keysight Technologies E4417A Specifications

General

Brand	Keysight Technologies
Model	E4417A
Category	Measuring Instruments
Language	English