Ametek 7230 Instruction Manual page 156

Appendix E, ALPHABETICAL LISTING OF COMMANDS
NOISEMODE [n] Noise Measurement Mode control
OA[.] [n]
OF[.] [n]
PHA[.]
PHASEPOL [n]
PORTDIR [n]
E-18
The value of n sets the noise measurement mode according to the following table:
n Function
0 Noise measurement mode off
1 Noise measurement mode on.
When the noise measurement mode is turned on, the output filter time constant is
automatically adjusted until it lies in the range 500 µs to 10 ms inclusive, the
synchronous time constant control is turned off, the fast analog output mode is
turned on (FASTMODE 1), and the output filter slope is set to 12 dB/octave if it had
previously been 18 or 24 dB/octave.
Oscillator amplitude control
microvolts rms. The range of n is 0 to 5000000 representing 0 V to 5 V rms.
In floating point mode n sets the amplitude in volts.
Oscillator frequency control
In fixed point mode n sets the oscillator frequency in mHz. The range of n is 0 to
120000000 or 250000000 representing 0 to 120 kHz or 250 kHz.
In floating point mode n sets the oscillator frequency in Hz. The range of n is 0 to
1.2E5 or 2.5E5
Signal phase
In fixed point mode causes the lock-in amplifier to respond with the signal phase in
centidegrees, in the range ±18000.
In floating point mode causes the lock-in amplifier to respond with the signal phase
in degrees.
Signal phase polarity control
n Function
Operation is the same as earlier SIGNAL RECOVERY lock-in amplifiers, such
0
as the models 7220, 7225, 7265, 7265, 7280, 5209 and 5210.
1 Operation is the same as earlier versions of firmware in the models 7270,
7124 and 7230
Digital port direction control
The value of n determines which of the eight lines on the digital port are configured
as inputs and which as outputs. The parameter n is a decimal number whose bit-wise
interpretation defines whether the corresponding line is an input or output. The line
is an input if the corresponding bit is a "1". For example:
n status
0 All lines configured as outputs
1 D0 = input, D1 - D7 = outputs
2 D1 = input, D0 and D2 - D7 = outputs
4 D2 = input, D0 - D1 and D3 - D7 = outputs
8 D3 = input, D0 - D2 and D4 - D7 = outputs
16 D4 = input, D0 - D3 and D5 - D7 = outputs
32 D5 = input, D0 - D4 and D6 - D7 = outputs
64 D6 = input, D0 - D5 and D7 = outputs