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:FRESistance?

MEASure:FRESistance? [<range>[,<resolution>]] [,<channel_list>] selects the

4-wire ohms 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

232 Ω | 1861 Ω | 14894 Ω |

119156 Ω | 1048576 Ω |

AUTO | DEF | MIN | MAX

ohms

numeric

resolution (see Table 5-1) |

DEF | MIN | MAX

ohms

<channel_list>

numeric cc00-cc15 (E1345A/E1347A) 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).

• Four-wire resistance measurements use channel pairs. For example, on the HP

E1345A multiplexer, 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.

• 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.

• To specify a MIN or MAX resolution while autoranging, you must specify

MEAS:FRES? AUTO or MEAS:FRES? DEF must be specified (you cannot omit

the range parameter). This prevents the

MIN or MAX resolution from being

interpreted as a range setting.

• The fastest aperture time available when autoranging is 100 µs. In order to specify an

aperture time of 10 µs, you must select a fixed range.

Chapter 5 Command Reference 144