[SENSe:]TEMPerature:APERture
[SENSe:]TEMPerature:APERture
Syntax
[SENSe:]TEMPerature:APERture {<seconds>|MIN|MAX|DEF} [, (@<ch_list>)]
[SENSe:]TEMPerature:APERture? [{(@<ch_list>)|MIN|MAX}]
Description
This command enables the aperture mode and sets the integration time in seconds (called aperture time) for temperature measurements on the specified channels.
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You should use this command only when you want precise control of the integration time of the internal DMM. Otherwise, specifying integration time using NPLC (see [SENSe:]TEMPerature:NPLC command) executes faster and offers better noise rejection characteristics for values of NPLC greater than 1. |
The following table shows which temperature transducers are supported by each of the multiplexer modules.
| Module | Thermocouple | RTD 2-Wire | RTD 4-Wire | Thermistor |
|---|---|---|---|---|
34901A Armature Multiplexer | Yes | Yes | Yes | Yes |
| 34902A Reed Multiplexer | Yes | Yes | Yes | Yes |
| 34908A Armature Multiplexer (1-Wire) | Not Recommended1 | Yes | No | Yes |
1With a one-wire multiplexer, even very small ground currents can introduce substantial measurement error.
Parameters
Name
Type
Range of Values
Default Value
<seconds>
Numeric
Desired aperture time in seconds between 400 µs and 1 second, with 4 µs resolution.
MIN = 400 µs, MAX = 1 second
Aperture disabled.
<ch_list>
Numeric
One or more channels in the form (@scc).
If <ch_list> is omitted, this command applies to the current scan list.
Remarks
- For the <seconds> parameter, you can substitute MIN or MAX for a numeric value. MIN selects the smallest value accepted, which gives the lowest resolution; MAX selects the largest value accepted, which gives the highest resolution.
- Only the integral number of power line cycles (1, 2, 10, 20, 100, or 200 PLCs) provide normal mode (line frequency noise) rejection.
- The CONFigure, MEASure?, and [SENSe:]TEMPerature:NPLC commands disable the aperture mode (these commands select an integration time in number of power line cycles).
- The aperture mode is disabled after a Factory Reset (*RST command). An Instrument Preset (SYSTem:PRESet command) or Card Reset (SYSTem:CPON command) does not change the setting.
Return Format
The query command returns the aperture time in the form "+1.00000000E-01" for each channel specified. Multiple responses are separated by commas.
Examples
The following command enables the aperture mode and sets the aperture time to 400 ms on channels 03 and 13 in slot 100.
TEMP:APER 400E-03,(@103,113)
The following query returns the aperture time selected on channels 03 and 13 in slot 100.
TEMP:APER? (@103,113)
Typical response: +4.00000000E-01,+4.00000000E-01