Stanford Research Systems DS345, Manual

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Performance Tests
5-2
FUNCTIONAL TESTS
These simple tests verify that the DS345's circuitry is functional. They are not intended to verify the DS345's
specifications.
Front Panel Test
This test verifies the functionality of the front panel digits, LED's, and buttons.
1) Turn on the DS345 while holding down [FREQ]. A single segment of the
leftmost digit should light.
2) Use [MODIFY DOWN ARROW] 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. [MODIFY UP ARROW] will step backward through the pattern.
3) Push the down arrow key again and all of the segments of all 12 digits
should light.
4) Press the down 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 LEDs 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 DS345 circuitry.
1) Turn on the DS345. The ROM firmware version number, and the serial
number should be displayed for about 3 seconds. The self tests will execute
and the message "TEST PASS" should be displayed. If an error message
appears see the TROUBLESHOOTING section for a description of the er-
rors.
Sine Wave
This procedure visually checks the sine wave output for the correct frequency
and any visible irregularities.
1) Connect the DS345's output to the oscilloscope input and terminate in
50
Ω
.
2) Set the DS345 to sine, 10 MHz, 10 Vpp. Set the scope to 2 V/div vertical,
and 100ns/div horizontal.
3) The scope should display a sine wave with one cycle per horizontal divi-
sion and about five divisions peak-to-peak. There should be no visible irreg-
ularities in the waveform.
Square Wave
This procedure checks the square wave output for frequency, rise time, and
aberrations.
1) Connect the DS345's output to the oscilloscope input and terminate in
50
Ω
.
2) Set the DS345 to square wave, 1 MHz, 10 Vpp. Set the scope to 2V/div