Ametek 7230 Instruction Manual page 96

Chapter 6, COMPUTER OPERATION
DCCOUPLE [n]
SEN [n]
SEN.
AS
ASM
6-10
Input coupling control
The value of n sets the input coupling mode according to the following table:
n Coupling mode
0 AC coupled
1 DC coupled
Full-scale sensitivity control
The value of n sets the full-scale sensitivity according to the following table,
depending on the setting of the IMODE control:
n full-scale sensitivity
IMODE=0
3 10 nV
4 20 nV
5 50 nV
6 100 nV
7 200 nV
8 500 nV
9 1 µV
10 2 µV
11 5 µV
12 10 µV
13 20 µV
14 50 µV
15 100 µV
16 200 µV
17 500 µV
18 1 mV
19 2 mV
20 5 mV
21 10 mV
22 20 mV
23 50 mV
24 100 mV
25 200 mV
26 500 mV
27 1 V
Floating point mode can only be used for reading the sensitivity, which is reported in
volts or amps. For example, if IMODE = 0 and the sensitivity is 1 mV the command
SEN would report 18 and the command SEN. would report +1.0E-03. If IMODE was
changed to 1, SEN would still report 18 but SEN. would report +1.0E-09
Perform an Auto-Sensitivity operation
The instrument adjusts its full-scale sensitivity so that the magnitude output lies
between 30% and 90% of full-scale.
Perform an Auto-Measure operation
The instrument adjusts its full-scale sensitivity so that the magnitude output lies
between 30% and 90% of full-scale, and then performs an auto-phase operation to
IMODE=1 IMODE=2
10 fA n/a
20 fA n/a
50 fA n/a
100 fA n/a
200 fA 2 fA
500 fA 5 fA
1 pA 10 fA
2 pA 20 fA
5 pA 50 fA
10 pA 100 fA
20 pA 200 fA
50 pA 500 fA
100 pA 1 pA
200 pA 2 pA
500 pA 5 pA
1 nA 10 pA
2 nA 20 pA
5 nA 50 pA
10 nA 100 pA
20 nA 200 pA
50 nA 500 pA
100 nA 1 nA
200 nA 2 nA
500 nA 5 nA
1 µA 10 nA