Analog Outputs - Ametek 7230 Instruction Manual

Chapter 6, COMPUTER OPERATION
FMSPANF[.] [n] Oscillator frequency modulation span frequency command
FMVSPAN[.] [n] Oscillator frequency modulation voltage span command

6.7.07 Analog Outputs

CH n
6-22
control in the range 0 to 10. The value of 0 gives the widest bandwidth for this filter,
with the value of 10 the lowest.
In fixed point mode n sets the oscillator frequency-modulation span frequency in
mHz. The range of n is 0 to 60000000 or 125000000 representing 0 to ± 60 kHz or
125 kHz; in floating point mode n sets the span frequency in the range 0 to 6.0E4 or
1.25E5.
Note: The center frequency
limits of the oscillator (0 to 120 or 250 kHz). Hence the center frequency plus the
span frequency cannot exceed 120.0 or 250.0 kHz and the center frequency must
be greater than or equal to the span frequency. For example, with an instrument
fitted with the 7230/99 upper frequency extension option and a 125 kHz center
frequency the maximum span frequency is
the maximum span frequency is
maximum span frequency is also
span frequency under computer control it is recommended to first set the span
frequency to zero followed by the center frequency to the required value and
finally the span frequency to the required value. This will avoid potential problems
with the new center frequency being rejected because it is not a legal value when
compared with the old span frequency.
The value of n sets the oscillator frequency modulation span voltage; in fixed point
mode n is an integer in the range 0 to +10000, corresponding to a range from
0.000 V to 10.000 V, and in floating point mode it is in volts.
Note: The span voltage plus the center voltage cannot exceed
[n ] DAC analog output control
1 2
Defines what outputs appear on the DAC1, DAC2, DAC3 and DAC4 connectors on
the rear panel.
n is compulsory and is 1 for DAC1, 2 for DAC2, 3 for DAC3, or 4 for DAC4
1
n Signal (DAC1)
2
0 X1% (2.5 V FS)
1 Noise % (2.5 V FS)
2 Ratio: (10 × X1%/ADC 1)
(10  X1%/ADC1)
3 Log Ratio: log
10
4 Equation 1
5 Equation 2
6 User DAC1
7 Main signal channel ADC output (digital signal monitor 1)
8 Magnitude2 % (2.5 V FS) (dual mode only)

the span frequency must not exceed the frequency

125 kHz; at 10k Hz center frequency

10 kHz; at 240 kHz center frequency the

10 kHz. When setting the center frequency and

10.000 V