Stanford Research Systems SR620, Руководство пользователя

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62 Performance Test
SR620 Universal Time Interval Counter
with 50% duty cycle. The signal should go
from 0V to 4V.
3)
Set the scope to 50 ohms. The REF
amplitude should now be 2V.
4) Set the REF output to ECL. The signal should
go from -1.8V to -0.8V with a 50 ohm
termination.
EXT input
1) Set the REF output to TTL and connect it to
the EXT input.
2) Adjust the EXT trigger knob and verify the
triggering starts at about 0V and stops at
about 4V.
3) Set the EXT input to 50 ohms and verify that
triggering now occurs between about 0 and
2V.
4) Set the REF output to ECL and verify that
triggering occurs between about -1.8 and -
0.8V.
A input
1) Set the REF output to TTL and connect it to
the A input.
2) Adjust the A trigger knob and verify the
triggering starts at about 0V and stops at
about 4V.
3) Set the A input to 50 ohms and verify that
triggering now occurs between about 0 and
2V.
4) Set the REF output to ECL and verify that
triggering occurs between about -1.8 and -
0.8V.
5) Set the A input to AC and verify that triggering
occurs between about -0.5 to +0.5 V.
B input
1) Set the REF output to TTL and connect it to
the B input.
2) Adjust the B trigger knob and verify the
triggering starts at about 0V and stops at
about 4V.
3) Set the B input to 50 ohms and verify that
triggering now occurs between about 0 and
2V.
4) Set the REF output to ECL and verify that
triggering occurs between about -1.8 and -
0.8V.
5) Set the B input to AC and verify that triggering
occurs between about -0.5 to +0.5 V.
Counter Channel Tests
1) Set the SR620 to TIME mode, A source,
+TIME arming, sample size to to 500,
Automeasure on (press the START button
until the AUTO LED comes on) and display
the mean. Tee the 10MHz rear panel output
to the A and B inputs using equal length
cables from the tee to the inputs. Set the A
and B inputs to 50 ohms and the trigger levels
to 0.0V.
2) Set the A and B slopes to +. The display
should read less than 1ns.
3) Set the display to jitter. The reading should be
less than 50ps.
4) Set the mode to frequency, the arming to 0.1s
gate, the source to A, sample size to 1. The
display should read 10 MHz ±35mHz.
(9999999.965 to 10000000.035 Hz)
5) Set the gate size to 1s. The display should
read 10MHz ±3.5mHz.
6) Set the A input to UHF. The reading should
be 10MHZ ±3.5mHz.
7) Set the source to B, and the B input to UHF.
The reading should be 10MHz ±3.5mHz.
Rear Panel Tests
1)
Attach the x and y scope outputs to an
oscilloscope in x-y mode. Set the scope input
channel to 1 V/div. Make sure that the
displayed picture is free of major distortion or
anomalies. Minor distortion can be caused by
poorly compensated scope inputs.
2) Attach the printer to the printer port. Press the
print button. The printed graph should be the
same as the displayed graph.
THIS COMPLETES THE FUNCTIONAL TESTS