HP 8904A - Page 248

Performance Tests
Model 8904A
Performance Limits
0, 0.8 to 655.35 ms
0, 0.8 to 655.35 ms
f20 ps
Performance Test 12
TONE SEQUENCE TIMING ACCURACY (OPTION 001)
Conditions
Option 001
except 0 off-time and 0 on-time
except
0 off-time and 0 on-time
Specification
Characteristic
Tone Sequence
On-time Duration
Off-time Duration
Timing Accuracy
Description
A repetitive, tone-burst sequence of five, 1 *kHz cycles is set up and observed on an oscilloscope. By
incrementing the duration of the burst (the on-time), the nominal
5 ms on-time is made to exactly
synchronize with the end of the fifth cycle of the burst. The total on-time incrementing equals the
on-time error.
The burst’s off-time is measured by setting the off-time equal to the previously measured on time
(nominally
5 ms) and observing the waveform on an audio spectrum analyzer. The analyzer will display
a 1 kHz “carrier” with 100 Hz sidebands. The off-time is incremented until the second sideband of
the
1 kHz carrier is suppressed. The total off-time incrementing equals the off-time error.
NOTE
For instruments with Option 006 (balanced output), even though the tone
sequences appear at Output
I, tone sequence timing accuracy is not specified.
Equipment
Audio Spectrum Analyzer.. ...........................................
HP 3561A or HP 3580A
Oscilloscope ..................................................... HP 1740A or Tektronix 2235
Procedure
On-Time Accuracy
1. Connect the Multifunction Synthesizer OUTPUTS 1 HIGH output to the high-impedance, ac
coupled oscilloscope’s input and to the (non-floating) input of the audio spectrum analyzer using
a tee. Refer to Figure 4-7.
Performance Test 12 4-37
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