SIGMA SQM-160 - Manual (Page 19)

Chapter 2 Operation
2-8
2.5 Sensor Min/Max Frequency
The Sensor Min/Max frequencies establish the operating range for the sensing quartz
crystals. Both values are used to determine the % life that is displayed in Xtal Life
mode.
When the sensor frequency drops below the minimum, the SQM-160 indicates a sensor
failure by blinking the Crystal Status display. Likewise, a sensor whose initial value
exceeds the maximum will cause a blinking Crystal Status.
To set sensor minimum and maximum frequencies:
1. Press Program to enter program mode.
2. Press Prev to enter the System Parameters Menu
3. Press Next until FMIN/FMAX is shown.
4. Depress the Control Knob to display FREQ MIN .
5. Adjust the Control Knob to the desired minimum operating frequency on Display2.
6. Depress the Control Knob to accept the minimum value and display FREQ MAX.
7. Adjust the Control Knob to the desired maximum operating frequency on Display2.
8. Depress the Control Knob to accept the maximum value.
9. Press Program to exit the System Parameters Menu and return to normal mode.