Pendulum CNT-91R User Manual

Specifications
Timebase
Specifications
CNT-91
R
Product Family
Timebase Type
'9X' Rubidium
Uncertainty due to:
-Calibration adjustment tolerance
@ +23 °C ± 3°C
<6x10
-12
-Aging:
per 24 h
per month
per year
1)
2)
n.a.
<5x10
-11
<2x10
-10
-Temperature variation:
0 °C - 45 °C
20 °C - 26 °C (typ. values)
10
<1x10
-
<1.2x10
-11
-Power voltage variation: ±10%
<1x10
-11
Short term stability:
(Root Allan Variance)

= 1 s
Typical values

= 1 0 s
<1x10
-11
<3x10
-1
2
Power-on stability:
-Deviation versus final value after 24 h on
time, after a warm-up time of 12 min:
<5x10
-10
Time to lock @25 °C
appr. 5 min
Total uncertainty,
for operating
temperature 0°C to 45 °C, @ 2  (95 %)
confidence interval:
-1 year after calibration
-2 years after calibration
<3x10
-10
3)
-10
<5x10
Typical total uncertainty, for
operating temperature 20°C to 26 °C,
@ 2  (95 %) confidence interval:
-1 year after calibration
-2 years after calibration
<2.5x10
-10
3)
<5x10
-10
Explanations
1)
After 3 months of continuous operation.
2)
After 1
st
year, aging during 1
st
year:
<5x10
-10
; long-term < 2 x 10
-9
/ 10 years.
3)After 1 year of operation. Uncertainty
<6x10
-10
the first year of operation.
Calibration Adjustment Tolerance is the
maximum tolerated deviation from the true
10 MHz frequency after a calibration. When
the reference frequency does not exceed the
tolerance limits at the moment of calibration,
an adjustment is not needed.
NOTE: Electrical adjustment by means of
tuning voltage from DAC; no potentiometer
trimming.
Serial interface for
closed-case
calibration
and status reporting.
8-45
USER MANUAL ● CNT 9x Series ● Rev.22 February 2020

Pendulum CNT-91R Specifications

General

Brand	Pendulum
Model	CNT-91R
Category	Measuring Instruments
Language	English