VXI VT1422A - Manual (Page 114)

112 Programming the VT1422A for Data Acquisition and Control Chapter 4
To set channels 0 through 15 to measure resistances greater than 8,000
Ω
and set channels 16, 20, and 24 through 31 to measure resistances less than
8k (in this case paired to current source SCP channels 32 through 57):
OUTP:CURR:AMPL 30e-6, (@132:147)
set 16 channels to output 30
μA for 8 kΩ or greater resistances
SENS:FUNC:RES 30e-6, (@100:115)
link channels 0 through 15 to resistance EU conversion (8 k
Ω or greater)
OUTP:CURR:AMPL 488e-6, (@148,149,150:157)
set 10 channels to output 488
μA for less than 8 kΩ resistances
SENS:FUNC:RES 488e-6, (@116,120,124:132)
link channels 16, 20, and 24 through 32 to resistance EU conversion
(less than 8 k
Ω)
Linking Temperature
Measurements
To link channels to temperature EU conversion, send the
[SENSe:]FUNCtion:TEMPerature <type>, <sub_type>,
[<range>,](@<ch_list>) command.
•
The <ch_list> parameter specifies which channel(s) to link to the
temperature EU conversion.
•
The <type> parameter specifies RTD, THERmistor, or TC (for
Thermo-Couple)
•
The optional <range> parameter can be used to choose a fixed A/D
range. When not specified (defaulted), the module uses auto-range.
RTD and Thermistor Measurements
Temperature measurements using resistance type sensors involve all the
same considerations as resistance measurements discussed in the previous
section. See the discussion of Figure 4-5 in "Linking Resistance
Measurements."
For resistance temperature measurements, the <sub_type> parameter
specifies:
•
For RTDs; "85" or "92" (for 100 ohm RTDs with 0.00385 or 0.00392
ohms/ohm/°C temperature coefficients respectively).
•
For Thermistors; 2250, 5000, or 10000 (the nominal value of these
devices at 25 °C).