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scope, verify that the readings are within the toler-
ances shown.
Table 4: Frequency Test Points
∆f
Frequency
100kHz
±5µHz
1MHz
±50µHz
5MHz
±250µHz
10MHz
±500µHz
30MHz
±1.5mHz
50MHz
±2.5mHz
6.9
This concludes the verification test of the
2965AR.
7.0
CALIBRATION
7.1 The 2960AR and 2965AR require no routine
adjustments for typical operation.
There are no periodic user adjustments required for
operation of the 2960AR or 2965AR. When
necessary, calibration should be performed "closed-
case" using an external 1pps source.
7.2 Closed-case calibration is obtained by connect-
ing the instrument to a known stable and accurate
1pps source, such as a GPS1. (Faster tracking is
obtained by using another 2960AR/2965AR already
tracking and stabilized to a 1pps source.)
7.3 Verify that the 1 PPS TRACKING light illumi-
nates green. A stable 1pps source will allow this illu-
mination within 15 minutes after connection.
7.4 Leave the unit tracking the 1pps in a stable envi-
ronment for a minimum of 5 days. During this time,
the internal auto-adaptive algorithm will measure
and qualify the 1pps source adjusting the frequency
to the long term average of the 1pps source.
7.5 Best calibration performance is obtained in an
environment stable to 23
The auto-adaptive frequency adjustment has a
resolution of ±5.12x10
NOVATECH INSTRUMENTS, INC.
Tolerance
1.0Vrms±0.25Vrms
1.0Vrms±0.25Vrms
1.0Vrms±0.25Vrms
1.0Vrms±0.25Vrms
1.0Vrms±0.5Vrms
1.0Vrms±0.5Vrms
NOTE:
o
o
C
3
C or better.
±
NOTE:
-13
.
7.6 Longer calibration periods are indicated for
obtaining maximum performance from the 2960AR
or 2965AR. Whenever possible, the units should
remain connected to a stable 1pps source.
7
2960AR/2965AR Manual, 13-Jul-2004
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