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L4451A and L4452A Calibration Procedures A
L4400 User’s Guide 251
6 Send the command CALibration:SECure:STATe ON to activate the new
code and secure the instrument.
7 Turn off the instrument and re- install the instrument sub-assembly
into the instrument carrier. Turn on the instrument.
Continue with the procedures for calibrating the instrument. Note that
the instrument will first have to be unsecured using the new security
code set in Step 5.
Calibration Message
The instruments allow you to store a message in calibration memory. For
example, you can store such information as the date when the last
calibration was performed, the date when the next calibration is due, the
instrument’s serial number, or even the name and phone number of the
person to contact for a new calibration.
• You can record a calibration message only when the instrument is
unsecured. You can read the calibration message whether the
instrument is secured or unsecured.
• The calibration message may contain up to 40 characters.
• Calibration Message Commands:
CALibration:STRing “<string>”
CALibration:STRing?
Calibration Count
You can query the L4451A and L4452A to determine how many
calibrations have been performed. Note that your instrument was
calibrated before it left the factory. When you receive your instrument,
be sure to read the count to determine its initial value.
• The calibration count increments up to a maximum of 2
32
- 1 after
which it rolls over to “0”. Since the value increments by one for each
calibration point, a complete calibration may increase the value by
many counts.
• Calibration Count Command:
CALibration:COUNt?