Datasheet

10 | Keysight | 53131A/132A/181A Counters - Data Sheet
Systematic uncertainty: ± 2x resolution
For measurements using Ch3, substitute Ch3 for Ch2 in these equations. To minimize relative
phase measurement error, connect the higher frequency signal to channel 1.
Time interval, pulse width, rise/fall time (53131A and 53132A only):
Systematic uncertainty:
± (Time base error × Measurement) Trigger level timing error ± 1.5 ns Differential channel
error (53131A)
± (Time base error × Measurement) Trigger level timing error ± 900 ps Differential channel
error (53132A)
where
t
res
= 750 ps for the 53131A, 300 ps for the 53132A
Phase (53131A and 53132A)
53132ASystematic uncertainty:
– (± Trigger level timing error ± 1.5 ns Differential channel error) × Frequency × 360° (53131A)
– (± Trigger level timing error ± 900 ps Differential channel error) × Frequency × 360° (53132A)
Duty cycle (53131A and 53132A)
RMS resolution: + Start trigger error
(t )
res
22 2
+ Stop trigger error
Frequency ratio:
Ch1 Ch1 Ch2 Ch3
Ch2 Ch3 Ch1 Ch1
, , ,
(53131A and 53132A)
Ch1 Ch2
Ch2 Ch1
,
(53181A)
Ch2 Freq × Gate time
1
LSD: Ratio :
1
2
2
(Ch1 Freq) × Gate time
Ch2 Freq
Ratio :
2
1
RMS resolution: Ratio :
1
2
Ch2 Freq × Gate time
2
2 × 1 + (Ch1 Freq × Ch2 Trigger error)
Ratio :
2
1
2
(Ch1 Freq) × Gate time
2
2 × Ch2 Freq × 1 + (Ch1 Freq × Ch2 Trigger error)
RMS resolution:
+ (2 x Trigger error )
( )
(T )
res
22
× Frequency × 360°
2
360°
Phase
1 +×
RMS resolution:
+ (2 x Trigger error )
( )
(T )
res
22 2
× (1 + Duty cycle ) × Frequency
53131A
750 ps
53132A
300 ps
t
res