Anritsu 37 D Series, Maintenance Manual, Page: 83 / 190

Chapter 5
System Performance
Verification
5-1
INTRODUCTION
This chapter provides specific procedures to be used to verify that the
VNA is making accurate, traceable S-parameter measurements. The
operational performance tests described in Chapter 4 should be per-
formed at least once anually, and prior to verifying the system perfor-
mance test procedures in this chapter.
Please ensure that you have read and fully understand the servicing
concepts for the VNA presented in Chapter 1 prior to continuing with
this chapter.
The ME7808B/C broadband system verification is described in
Appendix D.
5-2
CALIBRATION AND
MEASUREMENT
CONDITIONS The surrounding environmental conditions and the condition and sta-
bility of the test port connectors, through-cable, and calibration kit de-
termine the system measurement integrity to a large extent.
These are all user controlled conditions, and as such, should be evalu-
ated periodically for impact on system performance. If these conditions
vary significantly with time, the system verification procedures should
be performed more often than the recommended annual cycle.
Standard Conditions The standard conditions specified below must be observed when per-
forming any of the operations in this chapter—both during calibration
and during measurement.
q Warm-up Time:
One hour minimum
q Environmental Conditions:
Temperature: 23
±
3 deg C
Relative Humidity: 20% to 50% recommended
q Error Correction:
Perform software-guided 12-term calibration
37XXXD MM 5-3