5-34 Performance Verification Rev. D Sept 2007
5.11 Time Base Accuracy
5.11.1 Description
An external sine wave generator of 10.0 MHz with frequency accuracy better than 1
PPM is used.
Specifications
Clock : accuracy : ≤ ±0.001 % or ≤ ±10 PPM
5.11.2 Clock Verification Procedure
Recall Timebase Accuracy.lss or configure the DSO
Panel Setups : Recall FROM DEFAULT SETUP
Channels trace ON Channel 1
Input gain : .1 V/div.
Input offset : 0 mV
Trigger setup : Edge
Trigger on : C1
Slope 1 : Pos
Level 1 : 0 mV
Trigger mode : Auto
Delay : 50 %
Time base : 100 msec/div.
Measure : Parameters
P1 : Frequency of C1
Connect the RF output of the HP8648B generator through a 50 Ohm
coaxial cable into Channel 1.
Set the generator frequency to 10.0 MHz.
Adjust the generator output amplitude to get 6 divisions peak to peak.
Read of the frequency parameter (to 2 decimal places) and record the value in
Table 14.
Verify that the error is less than 100 Hz.
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