Agilent Technologies 53181A - Example Procedure for Set Reference Function-Offset from the Last Measurement Value (Seeing Digits Not Visible on the 12-Digit Display)

Chapter 2 Operating Your Frequency Counter
Using the MATH Menu Keys
Operating Guide 2-25
2
MATH: OFF is displayed. Now, Scale and Offset no longer are used to modify the
displayed result.
3 Press Run key to return the Counter to its normal operation.
Example Procedure for Set Reference Function—Offset From the Last
Measurement Value (Seeing Digits Not Visible on the 12-Digit Display)
The SET REF: YES menu item uses the negative of the last measurement value,
rounded to eleven digits, to set the OFFSET. It also resets the scale value to 1.0. Thus,
any difference in the offset (or now the reference value) and the current measurement
value is displayed.
Let’s assume you are measuring the frequency of a stable source, but you are only
interested in the least significant digits of the measurement. Use the SET REF: YES
menu item to configure the appropriate OFFSET value.
Your task is to measure a stable source to obtain the changes in the least significant
digits.
1Cycle POWER key to preset the Counter.
2 Change gate time to 15.0 seconds on GATE menu.
3 To demonstrate SET REF:, connect a 10 MHz sine wave signal to channel 1 of
the Counter, and press Freq Ch 1 key.
(Note that since the gate time is set to 15 seconds, it will take about 15 seconds to for
the Counter to display the measurement.)
10.000,000,000,1 MHz is displayed.
4 Press Scale & Offset key until SET REF: is displayed.
5 Press the any one of the arrow keys to select SET REF: YES, and press Enter
key.
OFFS: −10.00000 M is displayed, for example.