Specifications

Chapter 1 Performance Tests
Introduction
14 Assembly-Level Service Guide
Auditing the counter’s performance for the quick check points (designated
by a ‘Q’) verifies performance for normal accuracy drift mechanisms. This
test does not check for abnormal component failures. To perform the quick
performance check, do the following:
• Perform the counter Self-Test as shown on page 19.
• Perform only the performance verification tests indicated with the
letter Q at the beginning of the test.
• If the counter fails the quick performance check, repair may be
required. Refer to “Troubleshooting the Counter” on page 150.
Remote testing of the Counter
All of the counter tests may be run using an automated test system and
remote programming commands. Three interfaces are provided in each
counter to allow operation over an interface from a remote computer:
GPIB, LAN, and USB. Refer to the SCPI Programmer’s Reference for
information on the remote commands available for controlling the counter.
Performance Test Record
The results of the operational verification, and performance tests should
be recorded on a copy of the Performance Test Record, located at the end of
the complete performance tests section in this chapter.
Test Considerations
For optimum performance, all performance tests should comply with the
following recommendations:
• Ensure that the ambient temperature for running the Performance
Tests is stable and between 18 degrees C and 28 degrees C. Ideally,
the tests should be performed at 23
o
C ± 1
o
C.
• Ensure that ambient relative humidity is less than 80 %.
• Allow a 1-hour warm-up period before verification or calibration.
• Keep the instrument cables as short as possible, consistent with the
impedance requirements. Use only RG-58 or equivalent 50  cable for
measurements.