Time Base Accuracy; Description; Clock Verification Procedure - LeCroy WaveSurfer 400 Series Service Manual

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
5-34 Performance Verification

Clock Verification Procedure

Recall Timebase Accuracy.lss or configure the DSO
Panel Setups :
Channels trace ON
Input gain :
Input offset :
Trigger setup :
Trigger on :
Slope 1 :
Level 1 :
Trigger mode :
Delay :
Time base :
Measure :
P1 :
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.
Recall FROM DEFAULT SETUP
Channel 1
.1 V/div.
0 mV
Edge
C1
Pos
0 mV
Auto
50 %
100 msec/div.
Parameters
Frequency of C1
Rev. D Sept 2007