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8 Calibration Procedure
The 1504 uses a three-point calibration scheme with a quadratic polynomial
correction function to maintain the accuracy of its resistance measurement. The
three calibration points are at 0Ω,10kΩ, and 100 kΩ. Three calibration pa
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rameters determine the correction function: CAL0, CAL10, and CAL100.
The CAL0 parameter sets the correction at 0Ω resistance (but does not
affectthecorrectionat10kΩ). The CAL10 parameter sets the correction
at 10 kΩ resistance (but does not affect the correction at 0Ω). The
CAL100 parameter sets the correction at 100 kΩ resistance (but does
not affect the correction at 0Ω and 10 kΩ). Adjusting the calibration pa
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rameters directly affects the measurement at the specific resistances.
For example, increasing the CAL10 parameter by 0.1 increases the
measured value at 10 kΩ by 0.1Ω.
8.1 Accessing the Calibration Parameters
The calibration parameters are accessed in the Cal menu. The calibration pa-
rameters are protected by requiring the correct password to access them. Press
the Menu/Enter button, “SEt?” appears. Press the
/Exit button and hold it
down for one second, “CAL” appears briefly. The display will show “PA=
0000” and allow you to change the number to the correct password. You must
enter the password (“4051”). Use the L and R buttons to move between
the password digits and the U and D buttons to increase or decrease
the value of a digit. Press Enter when all the digits are correct. If the pass-
word is entered correctly the first parameter in the calibration menu will appear.
The first parameter in the Cal menu is the lockout control parameter, indicated
on the display as “LOCOUt”. This parameter has two options,“CAL”and
“ALL”. “CAL” (default) locks out the calibration menu only. “ALL” locks out
all menus and access to any menu requires the correct password. Use the L
and R buttons to select the lockout option and press Enter to continue.
The instrument calibration parameters follow.
The calibration parameters appear with the name shown briefly then the value.
You can change the sign and digits of each parameter. Use the L and R
buttons to move between digits and the U and D buttons to increase or
decrease the value of the digit. Press Enter to save the new value.
The calibration parameters can also be set using remote commands through the
RS-232 or IEEE-488 interfaces. The *PA=<password><EOS> command must
be used first, using the correct password (“4051”), to enable access to the cali
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bration parameters. Lockout protection is automatically set by cycling the
power. The *C0=<value><EOS>, *C1=<value> <EOS>, and
*C2=<value><EOS> commands can be used to set the values of the CAL0,
CAL10, and CAL100 parameters respectively.
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8 Calibration Procedure
Accessing the Calibration Parameters