Chapter 3—Characteristics
23
[1] [.] [0] [0] [0] [ENTER]
entering 1.000 V as the scan vertex potential.
7.
Press [DELAY 2]. Then key:
[1] [0] [SEC] [ENTER]
establishing 10 seconds as the time for which the vertex potential will be applied.
8.
Press [SCAN 2]. Then key:
[2] [0] [ENTER]
establishing a scan rate of 20 mV/s for the second leg of the scan as well.
9.
Press [E/I 3]. Then key:
[0] [ENTER]
establishing the scan-end potential at 0 V, which was also the starting potential.
10.
Locate the Cycle Select key (second key from the bottom in the CONTROL group).
Press this key as required to light the SINGLE CYCLE indicator.
11. Locate
[
] and [
] keys in the CURRENT RANGE group. Operate these keys as
necessary to light the 10 µA range indicator. AUTO must be OFF (adjacent light will be
extinguished.)
12.
Locate the OUTPUT SELECT key (bottom key of OUTPUT group). Operate this key as
necessary to light the LINEAR indicator.
13.
Set the CELL ENABLE switch to the ON position.
14.
Press the CELL ON key, lighting the associated indicator.
15.
Press the ENTER key as many times as are required to blank the bottom line of the
display.
The Model 273A is now ready to run the experiment. The programmed sequence will be
initiated in the following step.
16.
Press START. The following should be observed. Note: START can be pressed at any
time to restart the check sequence.
a.
The E/I 1 indicator (scan status display at upper left-hand corner of the front panel) will
flash once, indicating that the initial potential has been applied. This potential (0 V) and
the resulting current (0 A) will be indicated on the upper display line. Note: There is
always some small deviation from the nominal value. For purposes of these initial
checks, a normal current indication will be within 1% of the selected current range (range
is 10 µA; 1% of that is 100 nA). Potential indications should be within 10 mV of the
indicated value.
b.
The DELAY 1 indicator (scan status display) will light and remain lighted for 10 s, the
programmed delay interval. The displayed potential and current will remain constant.
Summary of Contents for 273A
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