Technical data

Quick-Start 1
Getting Started Guide 21
Certificates of Calibration
Customers receive 2 to 5 Certificates of Calibration (COCs) with the E6640A EXM test
set. The EXM is a scalable test set and can be purchased with 1 to 4 TRX modules. The
TRX modules, along with the Reference module (supplied with each E6640A), are the
only items that require calibration, and therefore they are the only items supplied with a
CoC and calibration sticker at shipment.
Each E6640A test set is shipped with a yellow envelope which contains your calibration
certificates; this envelope is labeled (lower right corner) with a sticker identifying the
unit model number (E6640A) and serial number. Inside each envelope will be from two
to five CoCs: one for the reference module, and one for each of the TRX modules
installed in the test set. This package constitutes your test set’s calibration data.
You may choose to physically attach calibration stickers to your E6640A test set
(recommended), or, as many customers do, you may choose to use the modules’
electronic calibration information to identify the calibration status of any module at any
time. The use of electronic calibration information is of benefit to those customers that
may want to move modules from one instrument to another: the calibration date always
follows the module.
To summarize: calibration of the E6640A is not done at the instrument level, but an
E6640A is fully calibrated when all of the modules (Reference module and TRX
modules) are calibrated. At initial shipment, this information is provided in the yellow
envelope supplied with each unit.