3390 50 kHz Arbitrary Waveform / Function Generator Verification and Adjustment Manual Section 1: Verification procedures
3390-905-01Rev. B / May 2016
1-3
Verification tests
Use the performance verification tests to verify the measurement performance of the instrument. The
performance verification tests are based upon the instrument's specifications.
Self Test
A brief memory self test is automatically completed when the instrument is powered on. This limited
test assures that the instrument is operational.
1. Press
Utility
on the front panel.
2. Select the
Self Test
softkey from the "Test/Cal" submenu.
When you release the key, the instrument will perform the self test procedure. The self test will
complete in approximately five seconds.
•
If the self test is successful, "Self Test Passed" is displayed.
•
If the self test fails, "Self Test Failed" and an error number are displayed.
Performance verification tests
The performance verification tests are recommended as acceptance tests when you first receive the
instrument. The acceptance test results should be compared against the instrument specifications.
Repeat the performance verification tests at each calibration interval after acceptance. If the
instrument fails performance verification, adjustment or repair is required.
Amplitude and flatness verification procedures
Measurements taken during the AC amplitude (high-impedance) verification procedure are used as
reference measurements in the flatness verification procedures. Additional reference measurements
and calculated references are utilized in flatness verification procedures. Record these reference
measurements and perform the calculations use the table below .
Use a digital multimeter (DMM) and power meter to complete the flatness verification procedures. To
correct the difference between the DMM and power meter measurements, you must set the power
meter with 0.00 dB level to the DMM at 1 KHz.
The flatness error of the DMM at 100 KHz must be applied in order to set the 0.00 dB reference.
The instrument internally corrects the difference between the high-Z input of the DMM and the 50
Ω
input of the power meter while setting the output level.
Allow the reference measurements to convert from V
RMS
(provided by the DMM) to dBm (provided by
the power meter).
For the conversion from V
RMS
(high-Z) to dBm (at 50
Ω), use the equation below.
Power (dBm) = 10 x log(5.0 x V
RMS
2 )
Flatness measurements for the –10 db, –20 dB, and –30 dB attenuator ranges are verified during the
0 dB verification procedure. No separate verification is given for these ranges.