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Compare this temperature with the temperatures listed on the probe calibration
report to verify that the coefficients you entered are correct.
6.5 Filtering
While measuring temperature, the readings may appear to vary. This may be
due to actual variations in temperature or electrical noise internal to the 1502A.
The filter helps to smooth variations in the measurements and improve resolu
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tion. The drawback is that filtering tends to slow the response to changes in
temperature. You can increase the filter time constant to further improve accu
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racy and resolution or decrease the time constant to reduce the response time.
You can set it to any value between 0 and 60 seconds. A value of 0 disables the
filter. The default time constant is 4 seconds.
To change the filter value, enter the Sample menu. This is done by first press
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ing the Menu button (“SEt?” appears) then pressing the F/Sample button.
The display will briefly indicate “SA Par”, then “FILtEr”, then the current
filter value. Use the U and D buttons to increase or decrease the filter value
then press Enter. The next parameter in the menu, the current, will then appear.
6.6 Setting the Current
You can select one of two options for the probe excitation current: 1.0 mA (de-
fault) or 0.5 mA. The current is set within the Sample menu. Press the Menu
button (“SEt?” appears) then press the F/Sample button. The filter value will
appear. Press Enter to continue. The display will briefly show “CurrEnt”
followed by the value for the current. You can use the Uand Dbuttons to
change the value for the current. Press Enter to continue.
6.7 Power Saver
The power saver feature causes the display to blank after a period of no user ac
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tivity. The power saver feature can reduce operating current by as much as 100
mA. While the display is blanked a small illuminated dot appears on the left
side of the display as an indication that the 1502A is still operating. Pressing
any button on the front panel restores the display. You can program the power
saver to activate after a specified period of time from 5 minutes to 60 minutes
in intervals of 5 minutes. You can also disable the power saver feature com
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pletely. The power saver is off by default.
The power saver is programmed in the Sample menu. Press the Menu button
(“SEt?” appears) then press the Sample menu button. Press Exit twice to skip
to the power saver parameter. The display will briefly show “PO SA” followed
by the power saver setting. You can use the U and D buttons to change the
power saver period (in minutes) or set it to OFF. Press Enter to continue.
1502A Thermometer Readout
User’s Guide
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