Operator Maintenance and Calibration
Calibration 7
7-9
Calibration Security Passcode
The integrity of Calibrator calibration is protected by a security passcode that must be
entered before new calibration constants can be saved to non-volatile memory. This
passcode replaces the hardware calibration switches found on older calibrators such as
the Fluke 5720A. As with the 5720A, the passcode also protects the ability to set the date
for the internal real-time clock.
If the passcode has not been entered, the Calibrator is secured. Once the passcode is
entered, it is unsecured. The Calibrator secures itself when it is reset or when the setup
menus are closed. The Calibrator can be unsecured at any time over the remote interface
with the CAL_SECURE command and by entering the passcode. The front panel prompts
for the passcode to unsecure the Calibrator before it can accept new values to be
eventually secured.
The passcode contains 1 to 8 decimal digits. The Calibrator is shipped with the passcode
set to "5730". To change the passcode, touch Setup Menu>Calibration>Change
Calibration Passcode. The Calibrator prompts for the current passcode and then the new
passcode. The passcode can also be changed over the remote interface with the
CAL_PASSWD command.
If the passcode for a particular Calibrator is lost, contact Fluke Customer Support. See
“How to Contact Fluke Calibration” in Chapter 1.
Artifact Calibration
The 5730A Calibrator must be calibrated to external standards at the beginning of the
calibration cycle. The length of the cycle (24 hours, 90 days, 180 days, or one year) is
selected in a Setup Menu described in Chapter 4.
To calibrate the Calibrator, apply three portable standards to the output binding posts:
1. 10 V dc voltage standard
2. 1 Ω resistance standard
3. 10 kΩ resistance standard
These standards are recommended:
• Model 732A or 732B DC Reference Standard
• Model 742A-1 1Ω Resistance Standard
• Model 742A-10k 10Ω Resistance Standard
Use 5440A-7003 (spade lugs) Low Thermal Leads for all connections:
Both the Calibrator and the recommended external standards have the ability to internally
control (or compensate for) ambient temperature variations. Therefore, it is unnecessary
to keep the Calibrator in tightly-controlled temperatures during calibration. During the
calibration procedure, the Calibrator prompts for the ambient temperature, and includes
this information in specification readouts and output shift reports.
Note
5440A-7002 and 5440A-7003 Low Thermal Lead sets include a third cable
specifically designed for completing Artifact Calibration. The 5730A-7002
and 5730A-7003 Low Thermal Lead sets do not include the third cable for
connection between reference standards.
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