IBM 7220, Instruction Manual

Page: 96 / 155

6-20
Chapter 6, COMPUTER OPERATION
FSTEP[.] [n
1
n
2
] Oscillator frequency sweep step size and type
The frequency may be swept either linearly or logarithmically, as specified by
parameter n
2
. The step size is specified by parameter n
1
.
Log sweep n
2
= 0
In fixed point mode, n
1
is the step size in thousandths of a percent.
In floating point mode n
1
is in percent. The range of n
1
is 0 to 100.00 %
Linear sweep n
2
= 1
In fixed point mode, n
1
is the step size in millihertz.
In floating point mode n
1
is in hertz. The range of n
1
is 0 to 10 kHz
SRATE[.] [n] Oscillator frequency sweep step rate
Sets the sweep rate in time per step in the range 50 ms to 1000 s, in 5 ms increments.
SWEEP [n] Oscillator frequency sweep start/stop
Starts/stops the internal oscillator frequency sweep depending on the value of n
according to the following table:
n Frequency sweep status
0 Stop/Pause
1 Run
When a frequency sweep has been defined, applying SWEEP 1 will start it. The
sweep will continue until the stop frequency is reached. If, during the sweep,
SWEEP 0 is applied, the sweep will stop at the current frequency. If SWEEP 1 is
then applied, the sweep will restart from this point. Once the sweep reaches the stop
frequency and stops, the next SWEEP 1 command will reset the frequency to the start
frequency and restart the sweep.
6.4.07 Auxiliary Outputs
DAC[.] n
1
[n
2
] Auxiliary DAC output controls
Sets the voltage appearing at the rear panel DAC1 and DAC2 outputs.
The first parameter n
1
, which specifies the DAC, is compulsory and is either 1 or 2.
The value of n
2
specifies the voltage to be output.
In fixed point mode it is an integer in the range -12000 to +12000, corresponding to
voltages from -12.000 V to +12.000 V.
In floating point mode it is in volts.