Figure 3-3 Adjustment Setup - Keysight Technologies E4417A Service Manual

3 Adjustments
To ensure maximum accuracy in re-adjusting the power reference oscillator
NOTE
output, this procedure provides step-by-step instructions for using Keysight test
instruments of known capability. Signal acquisition criteria may vary if
alternative test instruments are used. In such cases refer to the manufacturer's
guidelines for further information.
The power meter may be returned to the nearest Keysight Technologies office to
NOTE
have the power reference oscillator checked and/or adjusted.
Power Meter
Thermistor
mount
Figure 3-3 Adjustment Setup
For this adjustment the following mathematical assumptions are made:
Equation 1:
P meas
can be manipulated to give the following:
Equation 2:
V 1
78
Keysight 432A
Power Meter
Power ref
2V comp V 1 V 0
= - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
4R CalibrationFactor
(
= V comp V 0 +
–
V
RF
V
comp
2
+ V 0 V 1
( )
– –
)
V comp 2
–
10
( )
–
Keysight E4416A/E4417A Power Meters Service Guide
Digital Voltmeter
2
3
4R ) CalibrationFactor
( (
+ input
- input
)