6100B/6105A
Users Manual
7-20
7-33. Using an External Reference Frequency
Equipment required: a pulse source with frequency accuracy 2.5 ppm or better.
1. Connect any Pulse Input channel to an accurate frequency reference source between
10 Hz and 5 MHz. The source must be suitable to drive the Pulse Inputs. See Chapter
1 for input driving specifications.
2. Enable a voltage channel. For safety reasons, ensure nothing is connected to the
voltage terminals.
3. Use the Channel Configuration options (see “Preparing to Use the Energy Option”)
to select MUT Source to be “Channel 1 to 6 independent”.
4. Press Enter to accept the Channel Configuration and select the Display Units to be
Counts.
5. Begin a Free Run test by pressing the OPER key.
6. Verify that the frequency displayed for the chosen Pulse Input channel is within
±(10 ppm - pulse source frequency accuracy in ppm) of the applied frequency.
7. Terminate the test by pressing .
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