HP HP 8712ES, Руководство пользователя, Страница: 51 / 507

ES User’s Guide 2-17
Getting Started
Performing the Operator's Check
14. Verify that the data trace falls below
−
30 dB. If the data trace is off
the screen, press and the key
until the trace moves up onto the screen.
This concludes the operator's check. However, further confidence can be
obtained by performing the following:
• Measure a known filter to verify that its measured response is the
same as is expected. (A 175 MHz filter is supplied with the analyzer.)
Verify both the frequency accuracy and noise floor.
• Check broadband response with the filter using conversion-loss mode
(same as B*/R*).
• If the analyzer's frequency accuracy is critical for your application,
verify a CW frequency using a frequency counter. Verify to
±
.005%
accuracy (for example,
±
2500 Hz at 500 MHz). Ensure that the
analyzer is placed in trigger-hold mode (press
) to measure frequencies.
If the Analyzer Fails the Operator's Check
First, repeat the operator's check using a different cable and load to
eliminate these as a possible cause of failure. If your analyzer does not
meet the criteria in the operator's check, your analyzer may need
adjustment or servicing. Contact any Hewlett-Packard sales or service
office for assistance. Refer to
Table 9-10, “Hewlett-Packard Sales and
Service Offices,” in Chapter 9 for the nearest office. Before shipping your
analyzer, fill out and attach the blue repair tag, located at the back of the
analyzer’s Service Guide.
SCALE
Reference Level
MENU
Trigger
Hold