Ametek 7270 Instruction Manual page 160

Chapter 6, COMPUTER OPERATION
SRATE[.] [n]
SWEEP [n]
6-22
In floating point mode n
Linear sweep n = 1
2
In fixed point mode, n
In floating point mode n
Linear seek sweep n = 2
2
In fixed point mode, n
In floating point mode n
The seek sweep mode automatically stops when the signal magnitude exceeds
50% of full scale. This mode is most commonly used when setting up the virtual
reference mode.
Oscillator frequency and amplitude sweep step rate
In fixed point mode, sets the sweep rate in milliseconds per step, and in floating
point mode sets the rate in seconds. The range of n is 1 to 1000000 (1 ms to 1000 s)
Oscillator frequency and amplitude sweep control
n Sweep status
0 Stop
1 Start/continue frequency sweep
2 Start/continue amplitude sweep
3 Start/continue frequency sweep and amplitude sweep
5 Pause frequency sweep
6 Pause amplitude sweep
7 Pause frequency sweep and amplitude sweep
9 Link frequency sweep to curve buffer acquisition
10 Link amplitude sweep to curve buffer acquisition
11 Link frequency and amplitude sweep to curve buffer acquisition
This command is used to start or stop the internal oscillator frequency or amplitude
sweep, or to specify that the sweep should be linked to the curve buffer data
acquisition.
In the normal mode, when a frequency and/or amplitude sweep has been defined,
applying SWEEP with a parameter of 1 2 or 3 will start it. The sweep can be paused
using the command with the correct value of n for the sweep in progress. For
example, if a frequency sweep is started using SWEEP 1 then it can only be paused
by sending SWEEP 5. Similarly, it can only be continued by sending SWEEP 1. The
command SWEEP 0 will, however, stop either or both types of sweep.
When n is equal to 9, 10 or 11 the instrument is set to link the oscillator frequency
and/or amplitude sweeps to the curve buffer. The SWEEP command continues to
function as a write/read command except when the curve buffer acquisition is
actually running. In such cases, the SWEEP command changes to read-only and will
only report values of 9, 10 or 11, indicating what type of linking is active. The sweep
can then only be stopped by stopping the curve buffer, using the HC command.
However, the user can still determine the progress of the sweep using the curve
buffer monitor "M" command and the OF and/or OA (oscillator frequency and
amplitude) commands.
is in percent. The range of n
1
is the step size in millihertz.
1
is in hertz. The range of n
1
is the step size in millihertz.
1
is in hertz. The range of n
1
is 0 to 100.000%
1
is 0 to 250 kHz
1
is 0 to 250 kHz
1