Atec Agilent-53132A-53131A-53181A - Manual (Page 7)

7
Auto arming: Measurements are initiated
immediately and acquired as fast as possible,
using a minimum number of signal edges.
Timed arming: The duration of the measurement
is internally timed to a user-specified value
(also known as the “gate time”).
Digits arming: Measurements are performed
to the requested resolution (number of digits)
through automatic selection of the acquisition
time.
External arming: An edge on the external arm
Input enables the start of each measurement.
Auto arming, timed arming modes or another
edge on the external arm input may be used to
complete the measurement.
Time interval delayed arming: For time interval
measurements, the stop trigger condition is
inhibited for a user-specified time following the
start trigger. The 53132A offers advanced time
interval arming capabilities including use of user
specified time or Channel 2 events to delay both
start and stop triggers.
Measurement limits
Limit checking: The measurement value is
checked against user-specified limits at the
end of each measurement.
Display modes: The measurement result may
be displayed as either the traditional numeric
value or graphically as an asterisk moving
between two vertical bars.
Out-of-limits Indications:
• The limits annunciator will light on the front
panel
display.
• The instrument will generate an SRQ if
enabled via GPIB.
• The limits hardware signal provided via the
RS-232 connector will go low for the duration
of the out-of-limit condition.
• If the analog display mode is enabled, the
asterisk appears outside the vertical bars,
which define the upper and lower limits.
2 × Ch2 Freq × 1 + (Ch1 Freq × Ch2 Trigger error) 2
(Ch1 Freq) 2 × Gate time
(t
res
) 2 + Start trigger error 2 + Stop trigger error 2 RMS resolution:
RMS resolution:
RMS resolution:
Time interval, pulse width, rise/fall time (53131A and 53132A only):
RMS Resolution:
Systematic uncertainty: ± 2x resolution
LSD: Ratio :
t
res
53131A
750 ps
53132A
300 ps
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
Systematic 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)
1
Ch2 Freq × Gate time
Ch2 Freq
(Ch1 Freq) 2 × Gate time
Frequency ratio:
Phase (53131A and 53132A)
Duty cycle (53131A and 53132A)
Ch1 ,
Ch2 Ch1 ,
Ch3 Ch2 ,
Ch1 Ch3
Ch1 Ch1 ,
Ch2 Ch2
Ch1
(53131A and 53132A) (53181A)
2
1
1
2
Ratio :
1
2
Ratio :
2
1 Ratio :
2 × 1 + (Ch1 Freq × Ch2 Trigger error) 2
Ch2 Freq × Gate time
× Frequency × 360°
360°
Phase
1 +
2
×
( (T
res
) 2 (2 × Trigger error 2 ) ) × (1 + Duty cycle 2 ) × Frequency +
( (T
res
) 2 + (2 x Trigger error 2 ) )
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.