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measurement error due to the resistance of the wires. With four wires the in
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strument can completely cancel the error. The internal measurement circuit is
configured differently depending on the number of wires.
Note: The instrument tries to calculate a measurement even if the wire settings
are incorrect. Therefore, the Probe Wires setting must match the actual number
of wires or loss of accuracy will result (see Section 6.6). Use the Up and Down
buttons to set the value and press the ENT button to store and continue.
7.9.15 PCal
This function shows the date the probe was calibrated and allows it to be set.
The date is stored in the INFO-CON connector and is used simply for refer
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ence. Use the Up and Down buttons to set each date segment and the ENT but
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ton to move to the next date segment to the right. Press ENT when the date is
correctly entered. Press CLR to move to the next function without changing the
date.
7.9.16 PDue
This function shows the date the probe is due for calibration and allows it to be
set. The date is stored in the INFO-CON connector. The probe due date is regu-
larly checked against the present date and if the calibration has expired the user
is alerted with the message “Prb cal expired”. The message disappears only
when the probe is recalibrated and the probe calibration due date is set to a fu-
ture date. To set the date use the Up and Down buttons to set each date segment
and the ENT button to move to the next date segment to the right. Press ENT
when the date is correctly entered. Press CLR to move to the next function
without changing the date.
If any of the parameters in the CAL Mode were changed, the message “Up
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loading params” is displayed when exiting the PDue parameter. After the pa
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rameters have been uploaded into the INFO-CON connector, the meter
advances to the next menu item.
7.9.17 Digital Filter
The digital filter helps to smooth variations in the measurements and improve
resolution. A negative effect of filtering is that it tends to slow the response to
changes in temperature. You can increase the filter time constant to further im
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prove accuracy and resolution or decrease the time constant to reduce the re
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sponse time. Valid values are any number between 0.0 and 60.0 seconds. A
value of 0.0 disables the filter. The default is 0.0. Use the Up and Down but
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tons to set the value and press the ENT button to store and continue. Press
CLR to move to the next function without changing the filter.
7.9.18 MCal
This function shows the date the instrument was calibrated and allows it to be
set. The date is used simply for reference. Use the Up and Down buttons to set
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7 Display Functions
CAL MODE