Thermo Electron 8600 Series, Troubleshooting Service Manual

Page: 33 / 35

4 - 3
n. Sample Probe Zero Offset (optional)
1. Press the right arrow until SAM OF = +XX.X is
displayed in the message center.
2. Press Enter or right arrow key.
This function displays the amount of offset the sample
probe currently carries. The amount is displayed in
degrees Celsius with a .1 degree of accuracy. This
option is only available if there is a sample probe
installed.
Note: the freezer must be powered up with J10 of the
micro board jumpered in the S position to activate the
menu.
o. Analog Type
1. Press the right arrow until ALG OUT is displayed in
the message center.
2. Press up/down arrow to toggle between VOLT for 0
to 1 volt or 0 to 5 volt; or CRNT for 4 to 20mA.
3. Press Enter to save to memory.
This option must match the analog output dip switch
settings on the micro board.
p. Analog Calibration
Connect a decade box set at 250 Ohms to
pin 1 positive and pin 2 negative on the remote
alarm/analog connector on the freezer. Connect a digital
volt meter across the decade box.
1. Press the right arrow until ANALOG CAL is
displayed in the message center.
2. Press enter.
3. Observe the temperature display. Using the analog
output reference table, find the display temperature.
Locate the appropriate output for the temperature. Using
the up/down arrows and enter key on the freezer control
panel, adjust the reading until the meter reading is equal
to the output shown on the chart. Press enter.
Note: You must press enter for the output to change.