Digalog Systems 2040D Series, Maintenance Manual

Page: 46 / 67

Series 2040 Test System
Series 2040 Maintenance Manual V2.00 Certification
45
CERTIFICATION
System certification ensures that the system standards that are used for Selftest
and calibration are accurate, and can be traced to the National Institute of
Standards and Technology (NIST). There are two elements of the Series 2040
Functional Test System that need to be certified:
1) The TDAC high precision digital to analog converter on each
Selftest unit.
2) The TCXO precision oscillator on the Time Measurement System
(TMS) in the 2040 Testhead.
To perform a certification, the following equipment is necessary:
1) A Digalog Calibration Station
2) A Digalog Selftest assembly (Mounted on the 2040)
3) A printer (if a hard copy certificate is desired)
The Calibration Station contains a precision digital multimeter and a precision
counter/timer. Both instruments are equipped with a GPIB interface so that
the certification process (in terms of instrument setup and measurement
processing) is completely automatic.
Setup
A number of connections between the 2040 and the Calibration Station must
be made before continuing. These are:
1) Installation of the Selftest assembly. (See page 2-1.)
2) Power connections for the Calibration Station.
3) GPIB IEEE-488 communication link between the 2040 and the
Calibration Station.
4) Connections between the TDAC port on the Selftest assembly and
the multimeter.
5) Connections between the 10MHz output of the TMS in the
Testhead and the counter/timer.
Using the interconnect on the left page, hook a BNC cable from the 10MHz
connector on the back panel of the 2040 Console to the “A” input of the
Frequency counter of the Calibration Station. Using another BNC cable,
connect the TDAC signal from the Selftest unit to the Multimeter on the