Agilent 34980A  Multifunction Switch/Measure Unit 34980-90005

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3 Features and Functions Custom A/D Integration Time Integration time is the period of time the internal DMM’s analog- to- digital (A/D) converter samples the input signal for a measurement. Integration time affects the measurement resolution (for better resolution, use a longer integration time) and measurement speed (for faster measurements, use a shorter integration time). The default integration time is 1 PLC. Integration time is specified in number of power line cycles (PLCs). Select from 0.02, 0.2, 1, 2, 10, 20, 100, or 200 power line cycles. Only integral number of power line cycles (1, 2, 10, 20, 100, or 200 PLCs) provide normal mode (line frequency noise) rejection. You can also specify integration time in seconds (this is called aperture time). Select a value from 300 µs and 1 second, with 4 µs resolution. The only way to control the reading rate for ac measurements is by changing the channel delay (see “Channel Delay” on page 120) or by setting the ac filter to the highest frequency limit (see “AC Low Frequency Filter” on page 102). The specified integration time is used for all measurements on the selected channel. If you have applied Mx+B scaling, have assigned alarms to the selected channel or are using Monitor mode, those measurements are also made using the specified integration time. The following table shows the relationship between integration time, measurement resolution, number of digits, and number of bits. Integration Time Resolution Digits Bits 0.02 PLC 0.2 PLC 1 PLC 2 PLC 10 PLC 20 PLC 100 PLC 200 PLC < 0.0001 x Range < 0.00001 x Range < 0.000003 x Range < 0.0000022 x Range < 0.000001 x Range < 0.0000008 x Range < 0.0000003 x Range < 0.00000022 x Range The instrument selects 1 PLC when the measurement function is changed and after a Factory Reset (*RST command). An Instrument Preset (SYSTem:PRESet command) or Card Reset (SYSTem:CPON command) does not change the integration time setting. Front Panel Operation: DMM or Channel (Configure) > INTEGRATION > TIME First, select the measurement function on the active channel. You are automatically guided to the next level of the menu where you can select a specific integration time. Remote Interface Operation: You can set the integration time using the SENSe commands. For example, the following command specifies an aperture time of 2 ms for resistance measurements on channel 2001. SENS:RES:APER 0.002,(@2001) 4½ Digits 5½ Digits 5½ Digits 6½ Digits 6½ Digits 6½ Digits 6½ Digits 6½ Digits 88 Agilent 34980A Mainframe User’s Guide 15 18 20 21 24 25 26 26
Autozero Features and Functions 3 When autozero is enabled (default), the instrument internally disconnects the input signal following each measurement, and takes a zero reading. It then subtracts the zero reading from the preceding reading. This prevents offset voltages present on the instrument’s input circuitry from affecting measurement accuracy. When autozero is disabled, the instrument takes one zero reading and subtracts it from all subsequent measurements. It takes a new zero reading each time you change the function, range, or integration time. Applies to dc voltage, resistance, temperature, and dc current measurements only. The autozero mode is set indirectly when you set the resolution and integration time. Autozero is automatically turned off when you select an integration time less than 1 PLC. The CONFigure and MEASure? commands automatically enable autozero. The autozero setting is stored in non- volatile memory, and does not change when power has been off, after a Factory Reset (*RST command), or after an Instrument Preset (SYSTem:PRESet command). Front Panel Operation: DMM or Channel (Configure) > AUTO ZERO Remote Interface Operation: The OFF and ONCE parameters have a similar effect. Autozero OFF does not issue a new zero measurement. Autozero ONCE issues an immediate zero measurement. [SENSe:]:ZERO:AUTO {OFF|ONCE|ON} [,(@)] Agilent 34980A Mainframe User’s Guide 89
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1 Introduction to the 34980A Data A
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2 Getting Started Front Panel at a
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2 Getting Started Rear Panel Connec
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2 Getting Started Installing and Co
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2 Getting Started 2 Remove the two
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2 Getting Started 3 Make connection
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2 Getting Started Operating the 349
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2 Getting Started Configure Key Gro
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3 Features and Functions Sequences
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3 Features and Functions Factory Re
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3 Features and Functions Instrument
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3 Features and Functions 162 Agilen
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4 Introduction to the Plug-In Modul
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Index date, 153 dc current measurem
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Index 176 Agilent 34980A Mainframe
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Agilent 34980A  Multifunction Switch/Measure Unit *34980-90005*

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Agilent 34980A  Multifunction Switch/Measure Unit 34980-90005