SECTION 2
OPERATION
2.1 INTRODUCTION
This section includes operating instructions such as: prepara-
tion for use, environmental conditions, front and rear panel
control descriptions, output connections and several examples
of uass and applications of the Model 220. For Model 220 front
and rear panel illustrations refer to Figure 2-l.
2.2 PREPARATION FOR USE
2.2.1 Power-Up
Plug the Model 220 into the proper power receptacle in accor-
danca with Table 2-l. For fuss replacement or line switch
lS102j setting refer to the maintenance section.
WARNING
Ground the instrument through a properly
aarth grounded racaptacla before operation.
Failure to ground the instrument can result
in severe injury or death in the avant of short
circuit or malfunction.
Table 2-1. Line Voltage Setting
Input Voltage Switch Setting Fuse IFlOlj
5102
105V-125V I15VAC
%A. 25OV. 3AG
21OV25OV 230VAC
%A, 25OV. 3AG
9ov-1lOV’
116VAC ‘%A, 25OV. 3AG
18OV22OV’ 230VAC
%A, 25OV. 3AG
“For instrumenta equipped with low voltage transformer
TR-187.
Immediately after turning on the Model 220 via the power
switch, the display will indicate the followfng for several
seconds:
1. This ia a diiplay teat. The opsretor can nota inoperative
diiplay aegmenh by comparing the Model 220’s display
wfth tha figure above.
2. In addition, the push button and the TALK, LISTEN,
REMOTE indicators will light. All indicators will light
simultaneously if operating correctiy.
After ths display teat is complete the Model 220 will dkplay the
software revision level for approximately ona second.
Emmp’e: /
After the software revision level is displayed, the Model 220
will display ths primary address of the instrument for approx-
imately one second. The primary address of the Model 220 is
factory set at 12.
Example:
j f
I
I
I?
I
2.2.2 Warm-Up
To achieve rated accuracy the Model 220 requires one hour for
warm-up.
2.3 OPERATING INSTRUCTIONS
2.3.1 Environmental Conditions
Operation of the Model 220 should ba at an ambient
temperature within the range of O°C to 5O’C. up to 35°C at
70% noncondensing relative humidity. Environmental condi-
tions for storage are from -25OC to +70°C.
2.3.2 Front Panel Controls Description
Power On/Dff switch operates on the push-push principle.
Depressing this button turns the instrument on. Pushing the
button again heleasingl turns the instrument off.
Display-There are four operating functions in the display
group. They are deacribad as follows.
SOURCE
button selecta the source data for display. The full
Scala range of the available source current is 1.9995nA to
lOl.OOmA. The source current is displayed as a 4% digit
number with a single digit exponent. The least significant digit
of the 4’% digit diiplay is truncated to a “0” or a “5” when the
ENTER button is pressed. When a 1,2,3 or 4 is entersd ss the
least Signifiwnt digit, it is truncated to a zero when the ENTER
button is praaaed. When a 6, 7,8 or 9 is entered as the least
significant digit, it is truncated to a five when the ENTER but-
ton is pressed.
During the entry of source data onto the display (cursor is
flashing), pressing the SOURCE button reverta the display to
the prekus source data. A different source current can be
programrr& for each of the 100 memory locations.
V-LIMfT bumn selecta the voltage compliance for display.
The compliance voltage ranges from 1V to 105V in 1V in-
crements. The voltage compliance is displayed as a thrss digit
number. The three digit number is right justified when a one or
two digit number is entered and the ENTER button is pressed.
The voltage compliance limiting is bipolar.
The vokage limit accuracy for output current (I,,) greater than
1nA and Issa than 1004 is f 3%1+05V). For lDyt greater than
Or equal to 1OOfi there is an additional error of 1V in the seme
2-1
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