Ametek 7270 Instruction Manual page 202

Appendix E, ALPHABETICAL LISTING OF COMMANDS
DEMOD2SRC [n] Second stage demodulator signal source
ENBW[.]
EQU n
EVENT [n]
E-10
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
In the dual reference mode, the value of n sets the source of the signal for the second
stage demodulators according to the following table:
n Signal source
0 Main signal channel ADC (i.e. both demodulators are fed the same signal)
1 ADC1 - rear panel auxiliary ADC input
2 Demodulator 1 X channel output - this is the Tandem demodulation mode
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
5.3.08). The possible range is ±2,147,483,647 (signed 32-bit integer).
Event marker control
During a curve acquisition into the standard curve buffer, 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.
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