Tektronix 3 Series Hybrid Domain Oscilloscope

Set frequency range: 9kHz-50kHz, touch "Cursors" → "Marker", move the marker to "highest noise point", record DANL, need to be<-109dBm/Hz;

Switch the frequency range to 50kHz-5MHz (<-126dBm/Hz) and 5MHz-2GHz (<-136dBm/Hz), and repeat the test.

② Residual Stray Response Test

Test purpose: To confirm whether the "spurious signal without input" of the spectrum analyzer is within the qualified range, and excessive spurious will interfere with RF signal detection.

Testing process:

RF input connected to 50 Ω terminal, set reference level -15dBm, RBW 100kHz;

The frequency range is 9kHz-50kHz, and for observing stray signals, it is required to be<-78dBm;

Switch the frequency range to 50kHz-5MHz (<-78dBm), 5MHz-2GHz (<-78dBm,<-76dBm required at 1.25GHz), 2GHz-3GHz (<-78dBm,<-62dBm required at 2.5GHz), and record all excessive stray signals.

3. Test records and result processing

Test Record: The document provides a "Test Record" form (110 pages in total), which needs to be printed and filled in with the "lower limit value, test result, and upper limit value" for each test. For input terminal testing, the impedance value of "channel 1 1M Ω 10mV/div" needs to be recorded, and for DC balance testing, the "div" value needs to be recorded as evidence of instrument performance.

Result judgment and processing:

If the test result is within the range of "lower limit upper limit", it is judged as "Passed";

If it fails, first review the "operation steps, equipment settings" (such as whether SPC is executed and impedance is matched) to eliminate human errors;

If the operation is confirmed to be correct but still fails, the performance verification process "does not provide adjustment function", and it is necessary to refer to the "3 Series MDO Service Manual" to perform "factory calibration" (such as adjusting the analog channel gain resistance and AFG frequency reference); If calibration still fails, contact Tektronix for repair (North America 1-800-833-9200).

Test records and subsequent processing

Test record: The document provides a detailed table to record the "lower limit value test result upper limit value" for each test, which needs to be printed and filled in;

Result processing: Performance verification only judges whether it meets the standard, without adjusting the instrument; If the test fails, refer to the "3 Series MDO Service Manual" to perform factory calibration;

Calibration cycle: The validity period of the reference frequency error (± 10ppm) is 1 year, and it is recommended to calibrate once a year.