Beta [CVD only] - Set the beta probe coefficient
b0 [Therm only] - Set the b0 probe coefficient
b1 [Therm only] - Set the b1 probe coefficient
b2 [Therm only] - Set the b2 probe coefficient
b3 [Therm only] - Set the b3 probe coefficient
Probe Wires- Set the number of wires of the probe
PCal - Set the probe calibration date
PDue - Set the probe calibration due date
Filter- Set the digital filter time constant
MCal - Set the instrument calibration date
MDue - Set the instrument recalibration due date
CAL1 - Set the 0 to 400Ωinstrument calibration parameter
CAL2 - Set the 400Ωto 500 kΩinstrument calibration parameter
The calibration functions are described in detail in the following subsections.
7.8.1 Mtr Due
This functiondisplays the date the 1521 is due for calibration. The date cannot
be changed withthis function.
7.8.2 Prb Due
This function displays the date the probe is due for calibration. The date is
stored in the INFO-CON probe connector.The date cannot be changed with
this function.
7.8.3 Time
This function displays and sets the time of day. The time is alwaysset, dis -
played, or printed in 24-hour format. Toset each time segment use the Up and
Downbuttons. U se the ENT button to movebetween time segments and to
savethe changed values. The CLR button moves to the next function.
7.8.4 Passcode
Allfunctions below this function are protected by a pass-code so that only au-
thorized users can access them.The passcode must be entered correctly to con-
tinue.If thepasscode is entered incorrectly or the MODE or CLR buttons are
pressed, the message “InvalidPasscode” is displayed and the instrument is re-
turned to the next display mode after the display mode that was active before
theCAL Mode was entered.
Each individualinstrument has its own unique passcode. The passcode number
is givenon a notice provided with this instrument. The equipment manager is
responsiblefor keeping the passcode number stored in a proper location and
1521 Handheld Thermometer Readout
User’s Guide
30