Section 10: Calibrating the Model 9100: Resistance Function
10.4-37
Final Width = 215mm
10.4.7.2
Source Currents
The 9100 synthesizes resistance by sensing the current (I
source
) flowing into its terminals,
and then driving its terminal voltage to a value given by the equation:
V
terminals
= I
source
x R, Where R is the output value set on the 9100 display.
To cope with the wide range of source currents used by different UUTs, most of the
hardware configurations (spans of output resistance) associated with the Resistance
function have user-selectable 'UUTi Low' 'UUTi High' and 'UUTi Super' source current
operating modes.
These hardware configurations, and their corresponding ranges of UUTi source currents
used during normal operation of the 9100 are shown in Table 10.4.7.1. The 9100 is
switched between UUTi source currents by pressing the
CHANGE CURRENT
screen key.
Hardware Configuration Limits
Constant Source Current Limits
on Span of Output Resistance
UUTi Low
UUTi High
UUTi Super
00.0000
Ω
to 40.0000
Ω
250
µ
A to 3.5mA
2.5mA to 35mA
25mA to 350mA
040.001
Ω
to 400.000
Ω
25
µ
A to 320
µ
A
250
µ
A to 3.5mA
2.5mA to 35mA
0.40001 k
Ω
to 4.00000 k
Ω
25
µ
A to 320
µ
A
250
µ
A to 3.5mA
2.5mA to 35mA
04.0001 k
Ω
to 40.0000 k
Ω
2.5
µ
A to 32
µ
A
25
µ
A to 350
µ
A
250
µ
A to 3.5mA
040.001 k
Ω
to 400.000 k
Ω
250nA to 3.2
µ
A
2.5
µ
A to 35
µ
A
25
µ
A to 350
µ
A
0.40001 M
Ω
to 4.00000 M
Ω
25nA to 320nA
250nA to 3.5
µ
A
2.5
µ
A to 35
µ
A
04.0001 M
Ω
to 40.0000 M
Ω
8nA to 32nA
25nA to 350nA
250nA to 3.5
µ
A
040.001 M
Ω
to 400.000 M
Ω
4nA to 32nA
25nA to 200nA
N/A
Table 10.4.7.1: Resistance Spans and Source Current Limits in Normal Operation
Output Voltage Limitation
The terminal voltage compliance in the Resistance function is limited to 10V. As a result,
if the product (I
source
x R) is greater than 10V, the output will saturate and the apparent
output resistance will be less than the value indicated on the screen. Under these
conditions the following error message will be displayed:
======= WARNING =======
UUT sense current is high.
Internal circuits saturated.
Change current setting.
Содержание 9100 Series
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