3-35
3
To change offset and gain scale factors use:
SOURce:VOLT:OFFset n, value
SOURce:VOLT:SLOPe n, value
3.8.10 Reading the Analog Inputs
The Analog Inputs are read by the MEASure:VOLTage? query. The user
has to set the :RANGe, :POLarity and :AVERage values before reading an
input voltage. The factory defaults are for a 10 volts bipolar range and an
average value to reject 60 Hz noise. To read a voltage use:
MEAS:VOLT? n
'where n is analog channel number
A? n
Note - Use AFI to clear the average filter before reading a step input.
3.8.11 Reading the Temperature Inputs
The Temperature Inputs read Type J thermocouples with the
MEASure:TEMPerature? query. The temperature inputs are multiplexed
on analog channel 0. The user should not change the channel 0's :RANGe
or :POLarity settings. The AVERage value can be changed to reject noise
on the thermocouple inputs. The factory defaults are for a 5 volts unipolar
range and an average value to reject 60 Hz noise. To read a temperature use:
MEAS:TEMP? n
'where n is temperature channel
TM? n
For the example in Figure 3-2 use:
MEAS:TEMP? 1
'reads amplifier temperature
MEAS:TEMP? 2
'reads motor temperature
3.8.12 Setting the Filter Values
The filter function averages the A/D and temperature readings to minimize
noise errors. The filter values are factory set to average the readings over
a number of 60 Hz AC power cycles. Tables 3-4 and 3-5 list the filter
settings and the best sample periods for 50 and 60 Hz from an Excel
worksheet. The values are computed by
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