Ametek 7230 User Manual

Chapter 6, COMPUTER OPERATION
6-17
RT[.] Ratio output
In integer mode the RT command reports a number equivalent to 1000×X/ADC1
where X is the value that would be returned by the X command and ADC1 is the
value that would be returned by the ADC1 command.
In floating point mode the RT. command reports a number equivalent to X/ADC1.
LR[.] Log Ratio output
In integer mode, the LR command reports a number equivalent to
1000×log(X/ADC1) where X is the value that would be returned by the X command
and ADC1 is the value that would be returned by the ADC1 command. The response
range is -3000 to +2079
In floating point mode, the LR. command reports a number equivalent to
log(X/ADC1). The response range is -3.000 to +2.079
NHZ.
Causes the lock-in amplifier to respond with the square root of the noise spectral
density measured at the Y channel output, expressed in volt/Hz or amps/Hz
referred to the input. This measurement assumes that the Y channel output is
Gaussian with zero mean. (Section 3.3.20). The command is only available in
floating point mode.
ENBW[.] 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.
NN[.] Noise output
In fixed point mode causes the lock-in amplifier to respond with the mean absolute
value of the Y channel output in the range 0 to 12000, full-scale being 10000. If the
mean value of the Y channel output is zero, this is a measure of the output noise.
In floating point mode causes the lock-in amplifier to respond in volts.
DEFEQU [n
1
n
2
n
3
n
4
n
5
n
6
] Define user equation
The DEFEQU command is used to define the user equations, which take the
following form:
Equation =
(A B) C
D
 






Parameter n
1
is used to specify the equation to be modified, and is either 1 for
Equation 1 or 2 for Equation 2.
Parameter n
3
is used to set the addition/subtraction operator in the numerator
according to the following table:-
n
3
Operator
0 Subtraction
1 Addition
The parameters n
2
, n
4
, n
5
and n
6
specify the variables A, B, C and D respectively

Ametek 7230 Specifications

General

Brand	Ametek
Model	7230
Category	Amplifier
Language	English