Racal Instruments 2461 User Manual page 177

Phase Range
0.1 ° to 360 °
LSD
Fin ≤ 1MHz:
1MHz < Fin ≤ 10MHz:
10MHz < Fin ≤ 100MHz:
Resolution
TI Resolution
± ±
LSD
Period 1
Accuracy
TI Accuracy
± ±
LSD
Period 1
Note: (1) A constant signal is required during a phase measurement.
(2) A phase measurement will nominally take 160ms at 100MHz and
Phase 2 Relative to 1
To make this relative phase measurement, the UCT first makes a series of
measurements in different modes:
(1) Ratio 2/1 to ensure that 2 and 1 are at the same frequency.
(2) Period 2 (P
(3) Time Interval 2 to 1 (TI
The phase difference Φ
TI
Φ = × °
−
2 1
360
−
2 1
P
2
A-18
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
0.1 °
1 °
10 °
× °
360
× °
360
4s at 1Hz.
).
2
).
2-1
is then calculated as follows:
2-1
User Manual 2461 Type C