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Test 2-7: Frequency Accuracy (cont’d)
Test Procedure
(cont’d)
3. Set reference oscillator to INT1 or INT2, as specified in Table 2-7:
ROSC:SOUR INT1 Set ref osc to INT1
or
ROSC:SOUR INT2 Set ref osc to INT2
4.
Set marker source to "ROSC" or "TRIG", as specified in Table 2-7:
MARK:FEED "ROSC"
or
Set marker source to
"ROSC"
MARK:FEED "TRIG" Set marker source to
"TRIG"
5.
If the marker source is "TRIG", use the following commands to
output a squarewave (otherwise, skip this step):
FUNC SQU; Select squarewave
:FREQ2 <f requency>; Set AFG frequency
:TRIG:SOUR INT2 Set trig source
INIT:IMM Initiate
where <frequency> is the value given in the "Squarewave
Frequency" column of Table 2-7.
NOTE
If the marker source is "TRIG", the marker output frequency will be four
times the frequency of the squarewave, since it takes four points to produce
a squarewave. See Table 2-7 for the expected frequencies.
6. Measure frequency with the Counter and record the reading in Table
2-11.
Agilent E1445A Service Manual Verification Tests 57