Performance Test 61
SR620 Universal Time Interval Counter
PERFORMANCE TESTS
INTRODUCTION
The procedures in this section test the
performance of the SR620 and compare it to the
specifications in the front of this manual. The first
set of tests test the functionality of the SR620 from
the front panel and verify the functionality of the
circuitry. The second set of tests actually measure
the SR620's specifications. The results of each
test may be recorded on the test sheet at the end
of this section.
NECESSARY EQUIPMENT
The following equipment is necessary to complete
the tests. The suggested equipment or its
equivalent may be used.
1) 0 -20 MHz synthesized function generator that
can be phase-locked to an external reference
clock. Such as Hewlett-Packard HP3325B.
2) 100MHz - 2 GHz synthesized signal generator
such as Hewlett-Packard HP8642B.
2) Precision DC voltmeter such as Fluke 8840A.
3) 2 equal ( less than ±1/2")length BNC cables.
4) Epson compatible printer with PC compatible
cable (DB25 connector to Centronics
connector).
5) 100MHZ or faster Oscilloscope.
6) 10MHz frequency reference such as a Cesium
clock.
FUNCTIONAL TESTS
These tests verify that the SR620's circuitry is
functional.
Front Panel Test
This test verifies the functionality of the front panel
digits, LED's, and buttons.
1) Turn on the SR620 while holding down the
"DISP" button. A single segment of the
leftmost digit should light.
2) Use the MODE up arrow key to light each
segment (7 of them) and the decimal point of
the leftmost two digits. Only a single segment
should be on at a time. The MODE down
arrow key will step backward through the
pattern.
3) Push the up arrow key again and all of the
segments of all 16 digits should light.
4) Press the up arrow key repeatedly to light
each front panel indicator LED in turn, top to
bottom, left to right. At any time only a single
LED should be on.
5) After all of the LED have been lit further
pressing of the front panel keys will display the
key code associated with each key. Each key
should have a different keycode.
Internal Self-Tests
The internal self tests test the functionality of the
system RAM, the CPU, the video RAM, the two
internal counter channels, and the time interval
calibration.
1) Turn on the SR620. The model number, the
ROM firmware version number, and the serial
number should be displayed for about 3
seconds. Then the message SELF TEST
PASS should appear. If a TEST ERROR
message appears see the TROUBLESHOOT-
ING section for a description of the errors.
Test errors 33 and 34 indicate loss of
calibration and may be fixed by running the
Autocal procedure (see CONFIGURATION
MENU section).
Trigger Input Tests
These tests test the EXT, A, and B trigger inputs
and the REF output.
1) Set the SR620 mode to FREQ, source to A/B,
arming to EXT, Automeasure off (hold down
RESET button until AUTO LED goes off), and
display to TRIG to display the trigger levels on
the front panel.
2) Set the REF output to TTL and display the
output on a scope terminated into 1 Mohm.
The scope should display a 1kHz square wave
Summary of Contents for SR620
Page 2: ...SR620 Universal Time Interval Counter...
Page 6: ...iv Table of Contents SR620 Universal Time Interval Counter...
Page 8: ...vi Safety and Preparation for Use SR620 Universal Time Interval Counter...
Page 12: ...x Specifications SR620 Universal Time Interval Counter...
Page 58: ...42 Programming Commands SR620 Universal Time Interval Counter...
Page 72: ...56 Programming Examples SR620 Universal Time Interval Counter...
Page 76: ...60 Troubleshooting Tips SR620 Universal Time Interval Counter...
Page 82: ...66 Performance Test SR620 Universal Time Interval Counter...
Page 90: ...74 Calibration Procedure SR620 Universal Time Interval Counter...
Page 102: ...86 Circuit Description SR620 Universal Time Interval Counter...
Page 124: ...108 Parts List SR620 Universal Time Interval Counter...
