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Keithley 2182 Скачать руководство пользователя страница 18

12

Quick Reference Guide

Filter

The Model 2182 has an analog filter and a digital filter. When Filter is enabled by pressing
the FILT key (FILT annunciator on), it assumes the combination of analog and digital filter
configuration for the present measurement function (DCV1, DCV2, TEMP, TEMP2).
Filter state (enabled or disabled) and configuration is saved by each function.

Analog filter

With the low-pass Analog Filter ON, the normal-mode noise rejection ratio of the
instrument is increased at 60Hz. This filters out noise induced by the power line. The
analog filter attenuates frequency at 20dB/decade starting at 18Hz.

A primary use of the analog filter is to keep the high-gain input stage of the Model 2182
from saturating due to the presence of high AC and DC voltage. Note, however, that the
filter only attenuates AC voltages for the 10mV range of the Model 2182.

Digital filter

The digital filter is used to stabilize noisy measurements. The displayed, stored, or
transmitted reading is a windowed-average of a number of reading conversions (from 1 to
100).

In general, the digital filter places a specified number of A/D conversions (Filter Count)
into a memory stack. These A/D conversions must occur consecutively within a selected
reading window (Filter Window). The readings in the stack are then averaged to yield a
single filtered reading. The stack can be filled in two ways (Filter Type): moving or
repeating. The moving filter keeps adding and removing a single A/D conversion from the
stack before taking the average, while the repeating filter only averages a stack that is
filled with new A/D conversions.

Configuring filters

To configure the filters, press SHIFT TYPE, and then choose your selections as needed.
You can turn the analog and digital filters ON or OFF, and set digital filter window, count,
and select average or repeat type filters. See Section 3 of the Model 2182 User’s Manual
for details on filter parameters.

REL key

The REL key sets a rel value for the selected function (DCV1, DCV1, TEMP1, and
TEMP2). Note that a unique rel value can be established for each measurement function.

Perform the following steps to set a rel value:

1.

Display the reading you want as the rel value. This can be a zero offset reading that
you want to null out, or it can be an applied level that you want to use as a baseline.

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Содержание 2182

Страница 1: ...www keithley com Model 2182 2182A Nanovoltmeter Quick Reference Guide 2182A 903 01 Rev A June 2004 A G R E A T E R M E A S U R E O F C O N F I D E N C E...

Страница 2: ...m product modification without Keithley Instruments express written consent or misuse of any product or part This warranty also does not apply to fuses software non rechargeable batteries damage from...

Страница 3: ...04 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A First Printing June 2004 Document Number 2182A 903 01 Rev A This Quick Reference Guide supports both the Models 2182 and 2182A Refe...

Страница 4: ...uld incorporate immediately into the manual Addenda are numbered sequentially When a new Revision is created allAddenda associated with the previous Revision of the manual are incorporated into the ne...

Страница 5: ...tional Electrotechnical Commission IEC Standard IEC 60664 Most measurement control and data I O signals are Measurement Category I and must not be directly connected to mains voltage or to voltage sou...

Страница 6: ...instrument shows that the surface may be hot Avoid personal contact to prevent burns The symbol indicates a connection terminal to the equipment frame If this symbol is on a product it indicates that...

Страница 7: ...ted SCPI commands for remote operation are summarized in tables Most commands have a query form For example OUTPut ON turns the analog output on while OUTPut requests the present state of the analog o...

Страница 8: ...e explained throughout this guide 2182 NANOVOLTMETER RANGE CHANNEL 1 SHIFT LOCAL POWER RANGE SHIFT CH1 REM TALK LSTN SRQ STAT REL FILT 4W BUFFER MATH REAR SCAN TIMER STEP CH2 CH3 CH4 CH5 CH6 CH7 CH8 C...

Страница 9: ...DeoxIT WARNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY WARNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY CAUTION FOR CONTINUED PROTEC...

Страница 10: ...rature measurements that use an external simulated reference junction The red and black wires connect HI and LO of Channel 1 and the green and white wires connect HI and LO of Channel 2 Model 2107 Inp...

Страница 11: ...ctions for single channel voltage measurements using a Model 2107 cable to connect Channel 1 are shown in Figure 4 Test circuit DUT HI HI LO LO Black Green Red White DCV1 CH 1 CH 2 2182 2107 Input cab...

Страница 12: ...ltage measurements using a Model 2107 cable to connect both Channel 1 and Channel 2 are shown in Figure 5 Test circuit DUT HI HI LO LO Black Green Red White DCV1 CH 1 CH 2 2182 2107 Input cable Cable...

Страница 13: ...e input cable and thermocouple wires are immersed in the ice bath CH 1 CH 2 HI LO HI LO DUT Test circuit Thermocouple Thermocouple wire soldered directly to LEMO connector one of two TEMP1 Red Black 2...

Страница 14: ...e measurements is provided in Table 2 It assumes that the DUT is already connected to the Model 2182 as explained in Basic connections Table 1 Voltage measurement procedure Procedure Details 1 Connect...

Страница 15: ...string is the default condition See Section 14 FORMat subsystem of the Model 2182 User s Manual for details on all aspects of the data format SCPI commands SCPI commands to measure voltage and tempera...

Страница 16: ...ltage measurement example Command1 Comments RST Restore GPIB defaults SENS FUNC VOLT Select voltage measurement function SENS CHAN 1 Select channel 1 SENS VOLT CHAN1 RANG AUTO ON Enable channel 1 auto...

Страница 17: ...0 1 PLC Selects the fastest front panel integration time Select 0 1 PLC fast if speed is of primary importance at the expense of increased reading noise 1 PLC Selects a medium integration time Select...

Страница 18: ...general the digital filter places a specified number of A D conversions Filter Count into a memory stack These A D conversions must occur consecutively within a selected reading window Filter Window T...

Страница 19: ...HANnel1 LPASs b Enable disable DCV1 analog filter SENSe VOLTage CHANnel1 DFILter STATe b Enable disable DCV1 digital filter SENSe VOLTage CHANnel2 LPASs b Enable disable DCV2 analog filter SENSe VOLTa...

Страница 20: ...each input trigger or press of TRIG key will store a reading Recalling readings To recall readings press the RECALL key The BUFFER annunciator turns on to indicate that stored readings are being displ...

Страница 21: ...tion TRACe CLEar Clear readings from buffer TRACe FREE Query bytes available and bytes in use TRACe POINts n Specify number of readings to store 2 to 1024 TRACe FEED name Select source of readings SEN...

Страница 22: ...is option the beeper is disabled Only the HI IN LO status message is used for the Limit 1 test OUTSIDE With this option the beeper sounds when the reading is outside HI or LO of Limit 1 INSIDE With th...

Страница 23: ...ands Command Description CALCulate3 LIMit STATe b Enable disable Limit 1 test b ON or OFF CALCulate3 LIMit LOWer n Set lower limit for Limit 1 n limit 100e6 to 100e6 CALCulate3 LIMit UPPer n Set upper...

Страница 24: ...1 or TEMP2 or by selecting Delta Delta Delta provides the measurements and calculation for the DC current reversal technique to cancel the effects of thermal EMFs in the test leads Each Delta reading...

Страница 25: ...asurement function DCV1 DCV2 TEMP1 or TEMP2 or by selecting Ratio NOTE Delta measurements by the Model 2182 require the use of an alternating polarity source The source must have external triggering c...

Страница 26: ...nunciator will turn off Percent This math function determines percent deviation from a specified reference value The percent calculation is performed as follows Input Reference Percent 100 Reference w...

Страница 27: ...Specify units for mX b one or two characters enclosed in single or double quotes CALCulate KMATh PERcent NRf Specify reference value for Percent 100e6 to 100e6 CALCulate KMATh PERcent ACQuire Use inpu...

Страница 28: ...22 Quick Reference Guide...

Страница 29: ...ble Will not read applied input Overload Calibration only Certificate of calibration required Data required attach any additional sheets as necessary Show a block diagram of your measurement system in...

Страница 30: ...ll other trademarks and trade names are the property of their respective companies A G R E A T E R M E A S U R E O F C O N F I D E N C E Keithley Instruments Inc Corporate Headquarters 28775 Aurora Ro...

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