Publication No. 980935 Rev. A
3152B User Manual
Initial Instrument
Setting
To avoid confusion as to what initial setting is to be used for each test,
it is required that instrument be reset to factory default values prior to
each test.
Frequency
Accuracy
Frequency accuracy verifies the accuracy of the internal oscillator. The
internal oscillator determines the accuracy and stability of the entire
generator. The accuracy of the frequency depends on the 10 MHz
reference oscillator. The 3152B defaults to CLK10 which has 100 ppm
accuracy and the 3100M/R-3152B defaults to the internal TCXO which
provides an accuracy of 1 ppm.
The accuracy of the output frequency tests the internal TCXO because
its accuracy is much higher than the backplane CLK10. If both the
internal TCXO and the backplane CLK10 are insufficient for accuracy
purposes, an external 10 MHz reference clock can be applied to the
3100M/R-3152B or 3151B.
The 10 MHz external reference input is not available for the legacy
3152B.
Frequency
Accuracy, Internal
Reference
Equipment: Counter
Preparation:
1. Configure the counter as follows:
Termination: 50
Ω
, DC coupled
2. Connect the 3152B output to the counter input – channel A
3. Configure the 3152B as follows:
Waveform: Square
wave
Amplitude: 2
V
Output: On
Frequency:
As specified in Table 6-2
Test Procedure:
1. Perform frequency Accuracy tests using Table 6-2.
Table 6-2, Frequency Accuracy
3152B Setting
Error Limits
Counter Reading
Pass
Fail
10.0000000 Hz
±
10µHz
100.000000 Hz
±
0.1mHz
1.00000000 kHz
±
1mHz
10.0000000 kHz
±
10mHz
100.000000 kHz
±
100mHz
1.00000000 MHz
±
1Hz
10.0000000 MHz
±
10Hz
100.0000000 MHz
±
100Hz
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Performance Checks 6-3
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