Ametek 7280 Instruction Manual page 145

n
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
AS 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.
ASM 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
maximize the X channel output and minimize the Y channel output.
ACGAIN [n] AC Gain control
Sets the gain of the signal channel amplifier according to the following table:-
Chapter 6, COMPUTER OPERATION
full-scale sensitivity
IMODE=1 IMODE=2
10 fA n/a
20 fA n/a
50 fA n/a
100 fA n/a
200 fA n/a
500 fA n/a
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
IMODE=3
1 pA
2 pA
5 pA
10 pA
20 pA
50 pA
100 pA
200 pA
500 pA
1 nA
2 nA
5 nA
10 nA
20 nA
50 nA
100 nA
200 nA
500 nA
1 µA
2 µA
5 µA
10 µA
20 µA
50 µA
100 µA
6-11