Setting The Timebase Latches - Agilent Technologies E8285A Manual

Periodic Adjustments/Calibration

Setting the Timebase Latches

Setting the Timebase Latches
The refs_DAC_coarse and ref_DAC_fine values adjust the frequency of
the Test Set's internal 10 MHz reference. They are stored in memory. The
controller reads the values and sends the appropriate adjustment to the Reference
assembly.
The following procedure is to be used when running the program "Timebase
Reference Using a Counter" on page 132.
1. Press Config key to access the CONFIGURE screen, see Figure 5-5.
2. On the CONFIGURE screen, select SERVICE, the SERVICE screen appears.
Figure 5-5 SERVICE Screen
3. Connect a frequency counter to the rear-panel 10 MHz REF OUTPUT
connector.
4. Select the Latch field.
5. Select refs_DAC_coarse under the Choices: menu.
6. Select the Value field.
7. Rotate the knob until the counter reads as close to 10 MHz as possible.
8. Select the Latch field.
9. Select refs_DAC_fine under the Choices: menu.
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