®2620A/2625AHydra Series II Data Acquisition UnitHydra Series II Data LoggerUsers ManualPN 686675November 1997© 1997 Fluke Corporation, All rights res
viiiCautionTHIS IS AN IEC SAFETY CLASS 1 PRODUCT. BEFORE USING, THE GROUND WIRE IN THELINE CORD OR THE REAR PANEL BINDING POST MUST BE CONNECTED FOR S
2620A, 2625AUsers Manual4-30Table 4-8. Command and Query Reference (cont)ALARM_LIMIT Set Alarm LimitStore alarm limit information for the indicated ch
Using the Computer InterfaceComputer Interface Command Set44-31Table 4-8. Command and Query Reference (cont)DIO_LEVELS? Digital I/O State QueryReturns
2620A, 2625AUsers Manual4-32Table 4-8. Command and Query Reference (cont)MEASUREMENT UNITS STRINGScaled “MX+B”Volts DC “VDC”Volts AC “VAC”Resistance “
Using the Computer InterfaceComputer Interface Command Set44-33Table 4-8. Command and Query Reference (cont)For temperature functions, the "range
2620A, 2625AUsers Manual4-34Table 4-8. Command and Query Reference (cont)IEE? Instrument Event Enable QueryReturns the present value of the Instrument
Using the Computer InterfaceComputer Interface Command Set44-35Table 4-8. Command and Query Reference (cont)LOCK Lock the instrument front panel so th
2620A, 2625AUsers Manual4-36Table 4-8. Command and Query Reference (cont)The Totalizer count is returned as a scientific notation value in the range0
Using the Computer InterfaceComputer Interface Command Set44-37Table 4-8. Command and Query Reference (cont)LOG_MODE Determines treatment of new scan
2620A, 2625AUsers Manual4-38Table 4-8. Command and Query Reference (cont)MIN? Channel’s Minimum ValueReturns minimum value(s) for channels measured in
Using the Computer InterfaceComputer Interface Command Set44-39Table 4-8. Command and Query Reference (cont)NEXT? Next Scan’s ValuesThe NEXT? query re
ixSafety Terms in this ManualThis instrument has been designed and tested in accordance with IEC publication 1010,Safety Requirements for Electrical M
2620A, 2625AUsers Manual4-40Table 4-8. Command and Query Reference (cont)PRINT_TYPE? Data Logging Type Query (RS-232 only)Return the Autoprint or inte
Using the Computer InterfaceComputer Interface Command Set44-41Table 4-8. Command and Query Reference (cont)REMS Remote without Lockout (RS-232 only)E
2620A, 2625AUsers Manual4-42Table 4-8. Command and Query Reference (cont)RWLS Remote with Lockout (RS-232 only)Enter the IEEE-488.1 remote with front
Using the Computer InterfaceComputer Interface Command Set44-43Table 4-8. Command and Query Reference (cont)SCALE_MB? Mx+B Scaling Values QueryReturn
2620A, 2625AUsers Manual4-44Table 4-8. Command and Query Reference (cont)Use the lowest two bits of the value given as individual flags to specifythe
Using the Computer InterfaceComputer Interface Command Set44-45Table 4-8. Command and Query Reference (cont)TOTAL Set Totalizer CountGive the Totalize
2620A, 2625AUsers Manual4-46Table 4-8. Command and Query Reference (cont)TRIGGER? Trigger Type QueryReturns an integer representing the present trigge
5-1Chapter 5Additional ConsiderationsTitle PageIntroduction ...
2620A, 2625AUsers Manual5-2
Additional ConsiderationsIntroduction55-3IntroductionChapter 5 discusses some topics that will help you use the instrument more effectively.These cons
2620A/2625AUsers ManualxAC Power SourceThe instrument is intended to operate from an ac power source that will not apply morethan 264V ac rms between
2620A, 2625AUsers Manual5-4Verify the trigger type over the computer interface by sending the query:TRIGGER?Single scans can be triggered via the RS-2
Additional ConsiderationsAdvanced Trigger Mechanisms55-5LOWHIGH7.0V2.0V0.8V–0.6V0VALID EXTERNALTRIGGERSSCANTIMESCANHIGH≥ 100 mSFALLING EDGEHELD 5 µSIG
2620A, 2625AUsers Manual5-6Monitor Alarm Enabled (Type 2)This corresponds to the Front Panel ALAr or Computer Interface TRIGGER=2 setting.When the Mon
Additional ConsiderationsWhen Measuring Resistance or Temperature (Rtd)55-71211 13 14 15 16 17 18 19 2021 345678910SOURCE(4-WIRE)SENSE(4-WIRE)H L H LH
2620A, 2625AUsers Manual5-8Table 5-1. Ohms Test VoltageRange Typical Full Scale Voltage300.00 Ω 0.223.0000 kΩ 0.2530.000 kΩ 0.29300.00 kΩ 0.683.0000 M
Additional ConsiderationsMaking Mixed Measurements55-9average-responding measurement devices display the correct rms reading of 1.0000V(the dc compone
2620A, 2625AUsers Manual5-10DC AND ACTOTAL RMSTRUE RMS =0.0001.0001.0000.9000.6360.0000.7071.0001.0001.0002D0.0001.000AC-COUPLEDINPUTWAVEFORMPK-PKPEAK
Additional ConsiderationsUsing Shielded Wiring55-11• Avoid connecting inputs with ac volts signals to any channel 10 numbers away froma sensitive cha
2620A, 2625AUsers Manual1. Connect the shield to L (low) at the 2620A-100 Input Module, and try connecting thesensor shield to a quiet earth ground a
6-1Chapter 6MaintenanceTitle PageIntroduction ...
xiGetting StartedIntroductionThis section will have you operating Hydra in a matter of minutes. All basic operatinginformation is covered in this shor
2620A, 2625AUsers Manual6-2
MaintenanceIntroduction66-3IntroductionThis chapter describes basic maintenance that the instrument user can perform. Do notattempt any maintenance no
2620A, 2625AUsers Manual6-4Power-Line Cord ConnectorLine Fuse(T 125 mA, 250V, Slow Blow)Fuse Holder(Spare Fuse Provided)Complies with the limit for a
MaintenancePerformance Tests66-5Table 6-1. Power-Up Error CodesError Description1 ROM checksum error2 External RAM test failed3 Internal RAM test fail
2620A, 2625AUsers Manual6-6Table 6-2. Recommended Test EquipmentInstrument Type Minimum Specification RecommendedModelMultifunction Calibrator DC Volt
MaintenancePerformance Tests66-7Accuracy Verification Test1. Power up the instrument and allow it to temperature stabilize for 1/2 hour.2. Connect a
2620A, 2625AUsers Manual6-8Table 6-3. Performance Tests (Voltage, Resistance, and Frequency)Function Range Input Level FrequencyDisplay Accuracy(1 yea
MaintenancePerformance Tests66-9Table 6-3. Performance Tests (Voltage, Resistance, and Frequency) (cont)Using inputs in decades of 1.9:300 Ω short 0.0
2620A, 2625AUsers Manual6-103. Connect a cable from the Output VA HI and LO connectors of the 5700A to the VΩand COM connectors on the front panel of
MaintenancePerformance Tests66-11Note4-terminal connections are made using pairs of channels. 4-terminalmeasurements can only be made on channels 1 th
2620A/2625AUsers Manualxiithis example, "OFF" is lit if you’re working with channel 0, and have alreadyperformed the Configuration Reset).3.
2620A, 2625AUsers Manual6-121211 13 14 15 16 17 18 19 2021 345678910SOURCE(4-WIRE)SENSE(4-WIRE)H L H LH LH LH LH LH LH LH LH LH L H LH LH LH LH LH LH
MaintenancePerformance Tests66-131211 13 14 15 16 17 18 19 2021 345678910SOURCE(4-WIRE)SENSE(4-WIRE)H L H LH LH LH LH LH LH LH LH LH L H LH LH LH LH L
2620A, 2625AUsers Manual6-14RTD Temperature Accuracy TestThe following two RTD Temperature Accuracy Tests are different in that one uses aDecade Resis
MaintenancePerformance Tests66-15RTD Temperature Accuracy Test (Using DIN/IEC 751)1. Switch OFF power to the instrument and disconnect all other high
2620A, 2625AUsers Manual6-16Digital Output Test1. Ensure that communication parameters (i.e., transmission mode, baud rate, parity,and echo mode) on
MaintenancePerformance Tests66-17 Verify that the returned value as shown on the Host screen = 255.NoteThe number returned is the decimal equivalent o
2620A, 2625AUsers Manual6-185. Press the TOTAL button on the front panel of Hydra Series II. Assure Hydra Series II displays a 0 value.6. Jumper out
MaintenancePerformance Tests66-19Hydra Series II’s display should now show the totalizing value incrementing at a 10count per second rate.Dedicated Al
2620A, 2625AUsers Manual6-201211 13 14 15 16 17 18 19 2021 345678910SOURCE(4-WIRE)SENSE(4-WIRE)H L H LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH LH L
MaintenanceCalibration66-21External Trigger Input TestThe External Trigger Input Test verifies that the rear panel trigger input of Hydra SeriesII is
Getting Started (continued)xiiiselect the mode (“Mode” in right display) from “All” to output all scan data, “ALAr” tooutput only alarm data, or “trAn
2620A, 2625AUsers Manual6-22no parts to disassemble, no mechanical adjustments to make, and the instrument can becalibrated by an automated instrument
AppendicesAppendix Title PageA Specifications...A
A-1Appendix ASpecificationsIntroductionThe instrument specifications presented here are applicable within the conditions listedin the Environmental ch
2620A/2625AUsers ManualA-2DC Voltage InputsRange ResolutionSlow Fast300 mV 10 µV 0.1 mV3 V 0.1 mV 1 mV30 V 1 mV 10 mV300 V 10 mV 0.1 VAccuracy ± (% ±
AppendicesSpecificationsAA-3Thermocouple InputsTemperature Measurements - Accuracy (Thermocouples) (IPTS-68)Thermocouple Accuracy (±°C)*18°C to 28°C
2620A/2625AUsers ManualA-4Temperature Measurements - Accuracy (Thermocouples) (ITS-90)Thermocouple Accuracy (±°C)*18°C to 28°C 0°C to 60°CType(°C)Temp
AppendicesSpecificationsAA-5Input Impedance100 MΩ minimum in parallel with 150 pF maximumCommon Mode and Normal Mode RejectionSee Specifications, DC
2620A/2625AUsers ManualA-6IEC 751, Amendment 2, 100 e Platinum (ITS-90)RTD 4 Wire Accuracy* (±°C)Temperature Resolution 18°C to 28°C 0°C to 60°C(°C) S
AppendicesSpecificationsAA-71 Year Accuracy ±(% ± V)Range Frequency 18°C to 28°C0°C to 60°CSlow Fast Slow Fast20 Hz - 50 Hz 1.43% + 0.25 mV 1.43% +
2620A/2625AUsers ManualxivNoteYou cannot activate the Monitor function if the selected channel is set upas OFF; the instrument gives a long beep and i
2620A/2625AUsers ManualA-8Frequency Maximum Input at Upper Frequency20 Hz - 50 Hz 300 V rms50 Hz - 100 Hz 300 V rms100 Hz - 10 kHz 200 V rms10 kHz - 2
AppendicesSpecificationsAA-9Ohms InputsRange ResolutionTypical FullMaximumCurrentThroughMaximum OpenSlow FastScale Voltage Unknown Circuit Voltage30
2620A/2625AUsers ManualA-10Frequency InputsFrequency Range15 Hz to greater than 1 MhzRange Resolution Accuracy + (% ± Hz)Slow Fast Slow Fast15 Hz - 90
AppendicesSpecificationsAA-11Typical Scanning RateSee table below. The measurement conditions are: averaged rate over 20 scans;continuous scanning;
2620A/2625AUsers ManualA-12Maximum Autoranging Time(Seconds per Channel)Function Range Change Slow FastVDC 300 mV ----------------------------> 150
AppendicesSpecificationsAA-13Isolationnonedc-coupledThreshold1.4VHysteresis500 mVTrigger InputInput Voltagescontact closure and TTL compatible“high”
2620A/2625AUsers ManualA-14Digital and Alarm OutputsOutput Logic LevelsLogical “zero”: 0.8V max for an Iout of -1.0 mA (1LSTTL load)Logical “one”: 3.8
AppendicesSpecificationsAA-15AltitudeOperating: 2,000 m maximumNon-operating: 12,200 m maximumVibration0.7 g at 15 Hz1.3 g at 25 Hz3 g at 55 HzShock
2620A/2625AUsers ManualA-16Power90V to 264V ac (no switching required), 50 and 60 Hz, 10 VA maximum9V dc to 16V dc, 10W maximumIf both sources are app
B-1Appendix BASCII & IEEE-488 Bus Codes
Getting Started (continued)xv20...0LAST MIN MAXLAST MIN MAXoo24f.epsPress N or C to remove the Review data fro
2620A/2625AUsers ManualB-2B7B6B5B427262524B323222120B2B1B0BITSNUL SP!"12#$0@P pNULSOH GTLDLE MLA0 MLA16 @ MTA0 P MTA16 MSA0 MSA16PSPACECONTROLUPP
C-1Appendix CIEEE-488.2 Devise DocumentationRequirementsIntroductionSection 4.9 of the IEEE Standard 488.2-1987 states: "All devices shall supply
2620A/2625AUsers ManualC-2 Measurement rate: Slow. Scaling (M):1 (all channels) Offset (B): 0 (all channels) Alarm parameters: Limit-1 and Limit-2 OFF
AppendicesIEEE-488.2 Devise Documentation RequirementsCC-3 <PROGRAM MESSAGE UNIT> <PROGRAM MESSAGE UNIT SEPARATOR> <COMMAND MESSAGE U
2620A/2625AUsers ManualC-4 There are no device-to-device messages.11. The size of any block data responses, Section 8.7.9.4. There are no block data
AppendicesIEEE-488.2 Devise Documentation RequirementsCC-522. For each command, a statement describing whether is overlapped or sequential. All com
2620A/2625AUsers ManualC-6
D-1Appendix DMaking Mixed MeasurementsIntroductionThis appendix augments the discussion of ac signal effects on other channels (cross talk)found in Ch
2620A/2625AUsers ManualD-2AC Signal Cross Talk Into an AC Voltage ChannelACV Error Ratio = VACrms errorVACrms crosstalk Frequency crosstalk()() ()×
AppendicesMaking Mixed MeasurementsDD-3AC Signal Crosstalk Into a Temperature ChannelFrequency = 50, 60 HzTEMPERATURE Error Ratio = °CerrorVAC
2620A/2625AUsers Manualxvi
2620A/2625AUsers ManualD-4
E-1Appendix EBinary Upload of Logged Data(LOG_BIN?) (2625A only)IntroductionThe LOG_BIN? <index> query can be used to quickly upload logged data
2620A/2625AUsers ManualE-2/*-* decode(): Decode LOG_BIN? response string into raw byte stream**** Decoding is done on multiples of four input bytes:**
AppendicesBinary Upload of Logged Data (LOG_BIN?) (2625A only)EE-3The raw data output array contains the information listed below. Note that the num
2620A/2625AUsers ManualE-4The floating point format used is 32-bit with a 1-bit sign, 8-bit exponent, and 24-bitmantissa with the most significant bit
AppendicesBinary Upload of Logged Data (LOG_BIN?) (2625A only)EE-5/* Import globals from main program */extern int timestamp[];extern int misc[];ext
2620A/2625AUsers ManualE-6/* Globals convert() uses for destination */int timestamp[6]; /* Scan timestamp */int misc[3]; /* Temperatu
F-1Appendix FRS-232 CablingIntroductionThis appendix details the RS-232 cabling between the instrument and a PC, instrumentcontroller (Fluke 17XXA ser
2620A/2625AUsers ManualF-2For example, connection to a serial-to-parallel converter (when using a printer with aparallel input) may be as a DTE (cable
AppendicesRS-232 CablingFF-3RxTxDTRGNDDSRRTSCTS123456789RS-232CHYDRADB-9DCDRxTxDTRGNDDSRRTSCTSRI123456789COMPCDB-9RS43 CABLE(NULL MODEM)FEMALEMALEPI
1-1Chapter 1IntroductionTitle PageThe Hydra Series II Data Acquisition Unit... 1-3The Hydra Series
2620A/2625AUsers ManualF-4RxTxDTRGNDDSRRTSCTS123456789RS-232CHYDRADB-9TxRxRTSCTSDSRGNDDCDDTRRICOMPCDB-25RS40 CABLE(OR EQUAL)FEMALEMALEPINSKEYTx – TRAN
AppendicesRS-232 CablingFF-5RxTxDTRGNDDSRRTSCTS123456789RS-232CHYDRADB-9TxRxRTSCTSDSRGNDDCDDTRRIMODEMDB-25RS41 CABLE(OR EQUAL)FEMALEMALEPINSKEYTx –
2620A/2625AUsers ManualF-6RxTxDTRGNDDSRRTSCTS123456789RS-232CHYDRADB-9TxRxRTSCTSDSRGNDDCDDTRRIPRINTERDB-25RS42 CABLE(OR EQUAL)FEMALEMALEPINSKEYTx – TR
AppendicesRS-232 CablingFF-7DB-9CONNECTORCONNECTORSIDEDB-25CONNECTORSOLDERSIDEFEMALECONNECTORSIDESOLDERSIDEMALECONNECTORSIDESOLDERSIDEFEMALECONNECTO
2620A/2625AUsers ManualF-8
Hydra Configuration RecordSET-UP NAME_________________________________________ DATE_________________________SCAN RATE: q Slow TEMPERATURE UNITS q
1Index—2—2-wire accuracy, A-6, A-9—4—4-terminal resistance test, 6-10—A—AC signal cross talk in a dc voltage channel, D-1AC signal cross talk into a f
2620A/2625AUsers Manual2Front panel trigger control, 5-3—G—General, 3-22General information (RS-232 and IEEE-488), 4-13—H—How the instrument processes
LIMITED WARRANTY & LIMITATION OF LIABILITYEach Fluke product is warranted to be free from defects in material and workmanship undernormal use and
2620A, 2625AUsers Manual1-2
IntroductionThe Hydra Series II Data Acquisition Unit11-3NoteThis manual contains information and warnings that must be followed toensure safe operati
2620A, 2625AUsers Manual1-4Table 1-1. Hydra Features• Channel ScanningCan be continuous scanning, scanning at an interval time, single scans, or trigg
IntroductionWhere to go From Here11-5AccessoriesAccessories available for the instrument are described in Table 1-2.Table 1-2. AccessoriesModel Descri
2620A, 2625AUsers Manual1-6Getting StartedProvides a quick introduction to instrument setup and operation.Chapter 1 IntroductionDescribes standard fea
2-1Chapter 2OverviewTitle PageIntroduction ... 2-3
2620A, 2625AUsers Manual2-2
OverviewIntroduction22-3IntroductionChapter 2 provides an overview of the major features of the instrument. Comprehensivedetails on all instrument fea
2620A, 2625AUsers Manual2-4Line Power WarningTo avoid shock hazard, connect the instrument power cord to apower receptacle with earth ground.Plug the
OverviewSetting Up the Instrument22-5CALENABLEV 300VMAXPOWERREVIEWLASTMAXMINREMAUTOSCANMONSETMx+BFUNCALARM°C °F ROmV AC DCx1MkHzLIMITHILOOFFCALPRNEX
iTable of ContentsChapter Title Page1 Introduction... 1-1The Hydr
2620A, 2625AUsers Manual2-6REVIEWLASTMAXMINREMAUTOSCANMONx1MkLIMITHILOOFFCALPRNEXTSETMx+BFUNCALARM°C °F ROmV AC DCHzCHTR12ΩFoo03f.epsFigure 2-3. Left
OverviewSetting Up the Instrument22-7Table 2-1. Display AnnunciatorsMON Indicates that the Monitor function is enabled.SCAN Indicates that the Scan fu
2620A, 2625AUsers Manual2-8Table 2-1. Display Annunciators (cont)"1" Lit when alarm limit 1 is being defined. Also lit when displaying a mea
OverviewOperating Modes22-9Input ChannelsThe instrument provides one input (channel 0) on the front panel and 20 inputs (channels1 .. 20) through a co
2620A, 2625AUsers Manual2-10• Active Mode if this mode was in effect prior to the cycling of power. Scanning,monitoring, or combined scanning/monitor
OverviewFront Panel Buttons22-11Front Panel ButtonsGo ahead and press any front panel button. The instrument always provides an audibleresponse to eac
2620A, 2625AUsers Manual2-12Table 2-2. Front Panel Pushbuttons (cont)M Turns the Monitor function on or off.I Allows you to change the scan interval.
OverviewSetting up a Channel22-131. Select a channel to set up: G D Look for the desired channel number in the right display.2. Press the following
2620A, 2625AUsers Manual2-14NoteAny old alarm status/limits, Review array values, or scaling parametersare automatically cleared whenever you change a
OverviewSetting the Scan Interval22-15Mx+B ScalingThe menu for setting Mx+B scaling values takes you through the following steps:• Set the M value (s
2620A/2625AUsers ManualiiUsing the Scan Function... 2-16Reviewing Cha
2620A, 2625AUsers Manual2-16Using the Monitor FunctionThe Monitor function repeatedly measures the displayed channel. Press M to activatethe Monitor f
OverviewViewing the Totalizer Count22-17To clear out the contents of the Review array, press N to call the review data up tothe display, and then sele
2620A, 2625AUsers Manual2-18Using the Rack Mount KitUse the M00-200-634 Rack Mount Kit to mount the instrument in a standard 19-inchrack. First, rotat
3-1Chapter 3Operating the Instrument from the FrontPanelTitle PageIntroduction ...
2620A, 2625AUsers Manual3-2Front Panel Review Only Function... 3-26Front Panel Monitor Onl
Operating the Instrument from the Front PanelIntroduction33-3IntroductionChapter 3 describes how to use the instrument features that were introduced i
2620A, 2625AUsers Manual3-4Other Displayed DataAn array of "MIN", "MAX", and "LAST" values for each channel is updated w
Operating the Instrument from the Front PanelChannel Configuration33-5Table 3-1. Configuration Reset SettingsPerform a Configuration Reset to restore
2620A, 2625AUsers Manual3-6through both a known resistance and the sensed resistance. The resulting voltages aremeasured and appropriate conversions a
Operating the Instrument from the Front PanelChannel Configuration33-7Table 3-3. ResistanceChannel FunctionRange(Note 1)TerminalsPRESSTHESEBUTTONS:TOS
Contents (continued)iiiAutoprint: Computer Interface Control... 4-5Autoprint: Output Format...
2620A, 2625AUsers Manual3-8Table 3-5. Thermocouple TemperatureChannel FunctionRange(Note)PRESSTHESEBUTTONS:TOSELECTFROMTHESECHOICES:1..20OFFV DCV ACΩH
Operating the Instrument from the Front PanelChannel Configuration33-9Table 3-6. RTD Temperature Channel FunctionType(Note 1)Terminals(Note 2)R0(Ice
2620A, 2625AUsers Manual3-10Alarm evaluation is not carried out for a channel if:• The limit sense is changed to "OFF". Alarm checking and
Operating the Instrument from the Front PanelChannel Configuration33-11Alarm annunciation is disabled when the instrument is in Inactive or Configurat
2620A, 2625AUsers Manual3-12At any Configuration Reset (power up C or computer interface *RST), alarm limits onchannels 4 through 20 are assigned to D
Operating the Instrument from the Front PanelChannel Configuration33-13be changed at any point is brightly lit (solid for digits, flashing for other a
2620A, 2625AUsers Manual3-14Table 3-9. Mx+B SelectionChannelSign, MValueDecimalPointPositionMultiplier(Note 1)PRESSTHESEBUTTONS:GDBGDHJEGDHJEGDHJETO S
Operating the Instrument from the Front PanelInstrument Configuration33-15This number editing technique occurs during Configuration Mode operations wh
2620A, 2625AUsers Manual3-16Table 3-11. Measurement Rate SelectionPress these buttons: RATE(KJ)] GDETo select from thesechoices:SLOFAST(Completes sele
Operating the Instrument from the Front PanelMeasurement Connections33-17Setting Date and Time of DayThe instrument features a built-in, battery-maint
2620A/2625AUsers ManualivIsolated and Shielded Sensor Configuration ... 5-11In More Detail...
2620A, 2625AUsers Manual3-18DC Volts, AC Volts, Frequency, and ThermocouplesAny analog input channel (0 through 20) can be used to measure dc volts, a
Operating the Instrument from the Front PanelMeasurement Connections33-19LHLHLHHLHLHLHLHLHLHLHLLHLHHLHLHLHLHLHLHLHLHL HLHLHLHLHL HLHLHLHL HLHLHLHLHLHL
2620A, 2625AUsers Manual3-20Resistance and RTDFor all channels (0 through 20), 2-terminal resistance or RTD measurements are allowed.Four-terminal mea
Operating the Instrument from the Front PanelMeasurement Connections33-211211 13 14 15 16 17 18 19 2021 345678910SOURCE(4-WIRE)SENSE(4-WIRE)H L H LH L
2620A, 2625AUsers Manual3-22TotalizingGeneralEvent counting (totalizing) is commonly used on production lines for counting items.The instrument counts
Operating the Instrument from the Front PanelList Button Functions33-23Table 3-15. Review ArrayActivate (Note 1) Review PointsDeactivate(Note 3)NH JN2
2620A, 2625AUsers Manual3-2407:41:37 02/09/91CH LAST VALUE MAX VALUE MIN VALUE 1: 097.32 mVDC 098.51 mVDC 096.10 mVDC 2: 0.
Operating the Instrument from the Front PanelAutoprint33-25AutoprintThe front panel setup procedure is summarized in Table 3-17. Begin this procedure
2620A, 2625AUsers Manual3-26Table 3-17. Autoprint/Memory Storage SelectionDestination(“dESt”) (Note1)Mode (“MOdE”)(Note 2)Press thesebuttons:PMODEKU)G
Operating the Instrument from the Front PanelREM Annunciator33-27G and D can now be used to change the monitored channel. All other front panelbuttons
vList of TablesTable Title Page1-1. Hydra Features...
2620A, 2625AUsers Manual3-28
4-1Chapter 4Using the Computer InterfaceTitle PageIntroduction ...
2620A, 2625AUsers Manual4-2Status Byte Register... 4-19Reading the Stat
Using the Computer InterfaceIntroduction44-3IntroductionThe instrument can be operated from a host via commands sent through the rear panelcomputer in
2620A, 2625AUsers Manual4-4Setting Communication Parameters (RS-232)Baud rate ("bAUd"), parity ("PAR"), and echo ("Echo"
Using the Computer InterfaceUsing the RS-232 Computer Interface44-55. Press G or D to scroll to odd, even, or no parity, respectively. Press EE tosel
2620A, 2625AUsers Manual4-610:33:45 5/11/90Lines following the time and date contain measurement data for channels that have beenset up for this sessi
Using the Computer InterfaceUsing the RS-232 Computer Interface44-7Data for the oldest set of scan readings in Hydra Series II Data Logger memory can
2620A, 2625AUsers Manual4-8To connect the instrument to a specific brand of RS-232 printer, use the cable that wouldbe used to connect that printer to
Using the Computer InterfaceUsing the IEEE-488 Interface44-9RS-232 PromptsThe instrument parses and executes, in turn, each command received from the
2620A/2625AUsers Manualvi6-3. Performance Tests (Voltage, Resistance, and Frequency) ... 6-86-4. Performance Tests fo
2620A, 2625AUsers Manual4-1010 ’ EXAMPLE.BAS Hydra program to scan VDC, VAC, OHMS, FREQ, or TEMP20 ’ - initialize RS232 communication and set up
Using the Computer InterfaceUsing the IEEE-488 Interface44-11500 PRINT #1, "FUNC " + STR$(I) + "," + CMD$510 GOSUB 80
2620A, 2625AUsers Manual4-12Table 4-2. IEEE-488.1 CapabilitiesCapability DescriptionSH1 and AH1 Read and write bus handshaking, including hold off.T5
Using the Computer InterfaceGeneral Information (RS-232 and IEEE-488)44-132. Press D to scroll to "IEEE"; then press E to enable the IEEE-4
2620A, 2625AUsers Manual4-14Input StringsThe instrument processes and executes valid input strings sent by the host. A valid inputstring is one or mor
Using the Computer InterfaceGeneral Information (RS-232 and IEEE-488)44-15Select ohms function for channel 1Select 30-kilohm rangeSelect 2-wire (2T) c
2620A, 2625AUsers Manual4-16Sending Numeric Values to the Instrument (RS-232 and IEEE-488)Numeric values can be sent to the instrument as integers, re
Using the Computer InterfaceGeneral Information (RS-232 and IEEE-488)44-17loaded, the Message Available (MAV) bit in the Status Byte Register is set t
2620A, 2625AUsers Manual4-180123456701234567&&&&&&&&Logical ORStandardEvent Status RegisterRead Using *ESR?StandardEve
Using the Computer InterfaceGeneral Information (RS-232 and IEEE-488)44-19Table 4-4. Status Byte RegisterBit Name Description0 IEB Instrument Event Bi
viiList of FiguresFigure Title Page2-1. Adjusting Handle...
2620A, 2625AUsers Manual4-20Table 4-5. Event Status RegisterBit Name Description0 OPC Operation Complete. Set true (1) upon execution of the *OPC comm
Using the Computer InterfaceGeneral Information (RS-232 and IEEE-488)44-21Service Request Enable RegisterThe Service Request Enable Register (SRE) is
2620A, 2625AUsers Manual4-22Table 4-6. Instrument Event Register (IER)NoteWhenever the Instrument Event Register is read, the condition bits are clear
Using the Computer InterfaceComputer Interface Command Set44-23Table 4-7. Command and Query SummaryAlarmsALARMS? Active Alarms QueryALARM_ASSOC Associ
2620A, 2625AUsers Manual4-24Table 4-7. Command and Query Summary (cont)LockLOCK Lock/unlock front panel control keysLOCK? Returns instrument front pan
Using the Computer InterfaceComputer Interface Command Set44-25Table 4-7. Command and Query Summary (cont)Response FormatFORMAT Response FormatFORMAT?
2620A, 2625AUsers Manual4-26Table 4-8. Command and Query Reference*CLS Clear StatusClears all event registers summarized in the status byte, except fo
Using the Computer InterfaceComputer Interface Command Set44-27Table 4-8. Command and Query Reference (cont)*SRE Service Request EnableSets the Servic
2620A, 2625AUsers Manual4-28Table 4-8. Command and Query Reference (cont)ALARMS? Active Alarms QueryReturns alarm status for the indicated channel(s).
Using the Computer InterfaceComputer Interface Command Set44-29Table 4-8. Command and Query Reference (cont)ALARM_ASSOC? Alarm Association QueryReturn
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