where “
cc
” is the multiplexer (card) number.
•
The channel list is of the form
(@ccnn)
,
(@ccnn,ccnn)
, or
(@ccnn:ccnn)
, where
cc
= card number and
nn
= channel number (105 is channel 05 of card number 1,
for example).
•
Four-wire temperature measurements use channel pairs. On the HP E1345A
multiplexer, for example, channels 0 and 8, 1 and 9, 2 and 10, etc. are paired. The
lower channel in each pair (0, 1, 2, ...7) is the "sense" channel. Use channel_list to
specify the sense channels.
•
You can measure RTD types 85 (alpha=0.00385
Ω/Ω/°
C) and 92
(alpha=0.00392
Ω/Ω/°
C). The values 385, 0.00385, 392, 0.00392 are also
accepted for the type parameter.
•
Thermistor types are 2252, 5000, and 10000. Use thermistors that match the
Omega 440xx series temperature response curves.
Example
Making Thermocouple Measurements
MEAS:TEMP? TC,J,(@100:107)
!Measure J-type thermocouples (scan the 8
channels once); trigger source is IMMediate
by default.
enter statement
!Enter readings into computer.
:VOLTage:AC?
MEASure:VOLTage:AC? [<
range
>[,<
resolution
>]] [,<
channel_list
>]
selects the
AC-coupled RMS voltage function and allows you to specify the range and
resolution. If you specify a channel list, those multiplexer channels are scanned.
For a complete listing of range and resolution values available, see
Table 5-1 on page 120.
Parameters
Parameter Name
Parameter Type
Range of Values
Default Units
<
range
>
numeric
0.0795 V | 0.63V | 5.09 V |
40.7 V | 300 V | AUTO | DEF |
MIN | MAX
volts
<
resolution
>
numeric
resolution
(see Table 5-1) |
DEF | MIN | MAX
volts
<
channel_list
>
numeric
Refer to the multiplexer user’s manual for
a list of channels available.
none
Comments
•
To select a standard measurement range, specify range as the input signal’s
maximum expected voltage. The multimeter then selects the correct range.
•
The
AUTO
and
DEFault
options for the range parameter have the same effect
(enable autorange). The
DEF
option for the resolution parameter defaults the
integration time to 1 PLC.
147 Command Reference
Chapter 5
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