Example
Making 4-Wire Ohms Measurements
MEAS:FRES? 1560,MAX,(@100:103)
!Function: 4-wire ohms;
range selected: 1861
Ω
;
MAX resolution: 125 m
Ω
;
specify sense channel list (scan 4 channels
once); trigger source is IMMediate by
default.
enter statement
!Enter readings into computer.
:RESistance?
MEASure:RESistance? [<
range
>[,<
resolution
>]] , <
channel_list
>
selects the 2-wire ohms function and allows you to specify the range and resolution.
Two-wire ohms measurements can only be made using the scanning multimeter (a
channel list is required).
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
232
Ω
| 1861
Ω
| 14894
Ω
|
119156
Ω
| 1048576
Ω
|
AUTO | DEF | MIN | MAX
ohms
<
resolution
>
numeric
resolution
(see Table 5-1) |
DEF | MIN | MAX
ohms
<
channel_lis
t
>
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 resistance. 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.
•
The
MIN
and
MAX
parameters select the minimum or maximum values for range
and resolution:
For range:
MIN
= 232
Ω
;
MAX
= 1048576
Ω
For resolution:
MIN
selects the best resolution (the smallest value from Table 5-1)
for the selected range.
MAX
selects the worst resolution (the largest value from
Table 5-1) for the selected range.
•
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).
•
To select autorange, specify
AUTO
(or
DEF
) for range or do not specify a value
for the parameter. In the autorange mode, the multimeter samples the input signal
before each measurement and selects the appropriate range.
145 Command Reference
Chapter 5
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