Thermo Scientific APEX 100 User Manual page 57

6) When the calibration is complete, the detector displays the Main Menu, which should
now look something like this. (Your screen will look different if IXR is enabled.)
Product Name
7) Sometimes, however, the high-frequency and high gain settings are too sensitive,
which saturates the detector's circuit. When this occurs, the APEX halts the
calibration and displays a screen (see below) showing the next-best option—the
high-frequency/low gain option.
a. High Frequency/Low Gain Option
High Frequency, Low Gain
b. Press the Go button to restart the full product calibration. If this setting is too
sensitive, the following screen appears—the low frequency/high gain option.
c. Low Frequency/High Gain Option
Low Frequency, High Gain
Please note that if the frequency is changed, the APEX must relearn the X and R
noise thresholds for optimal performance. The APEX software will take you to
page 2 of the frequency and gain menu. Follow the directions on page 166 to
calibrate the X and R noise thresholds. Then return to the full calibration and
continue.
Thermo Scientific APEX User's Guide Page 57