Ametek 7280 Instruction Manual page 200

Appendix F, ALPHABETICAL LISTING OF COMMANDS
ENBW[.]
EQU n
EVENT [n]
F-8
Parameter n is used to set the addition/subtraction operator in the numerator
3
according to the following table:-
n Operator
3
0 Subtraction
1 Addition
The parameters n , n , n
2 4
according to the following table:
n Variable
0 X or X1
1 Y or Y1
2 MAG or MAG1
3 PHA or PHA1
4 ADC1
5 ADC2
6 ADC3
7 ADC4
8 C1
9 C2
10 0
11 1
12 FRQ
13 OSC
Dual modes only:-
14 X2
15 Y2
16 MAG2
17 PHA2
*Parameter n is the only one that can be set to values of 12 or 13.
5
Equivalent noise bandwidth
In fixed point mode, reports the equivalent noise bandwidth of the output low-pass
filters at the current time constant setting in microhertz.
In floating point mode, reports the equivalent noise bandwidth of the output low-pass
filters at the current time constant setting in hertz.
Output result of equation #1 or equation #2
The value returned is the output of the user equation #1 (n = 1) or equation #2 (n =
2), where the equations are defined using the Output equations menu (see section
5.3.11). The possible range is ±2,147,483,647 (signed 32-bit integer).
Event marker control
During a curve acquisition, if bit 13 in the CBD command has been asserted, the
lock-in amplifier stores the value of the Event variable at each sample point. This can
be used as a marker indicating the point at which an experimental parameter was
changed. The EVENT command is used to set this variable to any value between 0
and 32767.
and n specify the variables A, B, C and D respectively
5 6
Range
±30000
±30000
0 to 30000
±18000
±10000
±10000
±10000
±10000
0 to 100000
0 to 100000
zero
unity
0 to 2000000000 (i.e. reference frequency in mHz)*
0 to 2000000000 (i.e. oscillator frequency in mHz)*
±30000
±30000
0 to 30000
±18000