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Fluke 2620A User Manual

Hydra series ii data acquisition unit, hydra series ii data logger
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2620A/2625A
Hydra Series II Data Acquisition Unit
Hydra Series II Data Logger
Users Manual
PN 686675
November 1997
© 1997 Fluke Corporation, All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.

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  Summary of Contents for Fluke 2620A

  • Page 1 ® 2620A/2625A Hydra Series II Data Acquisition Unit Hydra Series II Data Logger Users Manual PN 686675 November 1997 © 1997 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies.
  • Page 2 Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price.
  • Page 3: Table Of Contents

    The Hydra Series II Data Acquisition Unit ... 1-3 The Hydra Series II Data Logger ... 1-3 Options and Accessories ... 1-3 Applications Software... 1-3 IEEE-488 Interface Assembly... 1-3 Connector Set (2620A-100) ... 1-3 Accessories... 1-5 Where to go From Here... 1-5 Overview... 2-1 Introduction ... 2-3 Setting Up the Instrument...
  • Page 4 2620A/2625A Users Manual Using the Scan Function... 2-16 Reviewing Channel Data... 2-16 Viewing the Totalizer Count ... 2-17 Using External DC Power ... 2-17 Using the Rack Mount Kit... 2-18 Operating the Instrument from the Front Panel... 3-1 Introduction ... 3-3 Operating Modes ...
  • Page 5 Autoprint: Computer Interface Control ... 4-5 Autoprint: Output Format ... 4-5 Memory Storage: Computer Interface Control... 4-6 Memory Retrieval ... 4-6 Memory Full Operation ... 4-7 Clearing Memory... 4-7 Cabling the Instrument to a Host or Printer (RS-232) ... 4-7 Installation Test...
  • Page 6 2620A/2625A Users Manual Isolated and Shielded Sensor Configuration ... 5-11 In More Detail ... 5-12 Maintenance ... 6-1 Introduction ... 6-3 Cleaning... 6-3 Line Fuse ... 6-3 Self-Test Diagnostics and Error Codes ... 6-3 Performance Tests ... 6-4 Accuracy Verification Test ... 6-7 Channel Integrity Test...
  • Page 7 Table 1-1. Hydra Features... 1-4 1-2. Accessories ... 1-5 2-1. Display Annunciators ... 2-7 2-2. Front Panel Pushbuttons ... 2-11 2-3. Review Array... 2-17 3-1. Configuration Reset Settings ... 3-5 3-2. DC Voltage, AC Voltage ... 3-6 3-3. Resistance ... 3-7 3-4.
  • Page 8 2620A/2625A Users Manual 6-3. Performance Tests (Voltage, Resistance, and Frequency) ... 6-8 6-4. Performance Tests for Thermocouple Temperature Function (IPTS-68/ITS-90) . 6-13 6-5. Performance Tests for RTD Temperature Function (Resistance) (DIN/IEC 751 Amendment 1) (IPTS-68) ... 6-14 6-6. Performance Tests for RTD Temperature Function (DIN/IEC 751 Amendment 1) (IPTS-68) ...
  • Page 9 Figure 2-1. Adjusting Handle ... 2-3 2-2. Front Panel... 2-5 2-3. Left Display ... 2-6 2-4. Right Display ... 2-6 2-5. Annunciators... 2-6 2-6. Rear View ... 2-8 3-1. Configuration Mode... 3-3 3-2. Input Module Connections ... 3-19 3-3. 2-Terminal and 4-Terminal Connections... 3-21 3-4.
  • Page 10 20402. Stock No. 004-000-00345-4. Declaration of the Manufacturer or Importer We hereby certify that the Fluke Model 2620A Data Acquisition Unit and 2625A Data Logger are in compliance with BMPT Vfg 243/1991 and is RFI suppressed. The normal operation of some equipment (e.g.
  • Page 11 Safety Terms in this Manual This instrument has been designed and tested in accordance with IEC publication 1010, Safety Requirements for Electrical Measuring, control and Laboratory Equipment. This Users Manual contains information, warnings, and cautions that must be followed to ensure safe operation and to maintain the instrument in a safe condition.
  • Page 12 2620A/2625A Users Manual AC Power Source The instrument is intended to operate from an ac power source that will not apply more than 264V ac rms between the supply conductors or between either supply conductor and ground. A protective ground connection by way of the grounding conductor in the power cord is required for safe operation.
  • Page 13: Getting Started

    Introduction This section will have you operating Hydra in a matter of minutes. All basic operating information is covered in this short Getting Started guide. Subsequent chapters of the manual cover the instrument in more detail. This manual contains information and warnings that must be followed to ensure safe operation and retain the instrument in safe condition.
  • Page 14 Selecting the Scan Data Destination The 2620A will always send the scan data to the RS-232 printer port, following each scan. The 2625A can be configured to send the scan data to the RS-232 printer port, or to the internal Memory Storage, or to both simultaneously.
  • Page 15 select the mode (“Mode” in right display) from “All” to output all scan data, “ALAr” to output only alarm data, or “trAnS” to output data scanned only when the Hydra goes into or out of alarm. Once the destination and mode have been set, enable Memory Storage by pressing: print. The “PRN”...
  • Page 16 2620A/2625A Users Manual You cannot activate the Monitor function if the selected channel is set up as OFF; the instrument gives a long beep and ignores your request. The "MON" annunciator comes on, and the instrument starts taking measurements on the selected channel.
  • Page 17 Press N or C to remove the Review data from the display when you’re through. The remainder of this manual covers all aspects of using Hydra. Glance over the Table of Contents; you’ll find that each section presents an additional layer of information. You can use as little as (or as much as) you need for your Hydra application.
  • Page 18 2620A/2625A Users Manual...
  • Page 19: Introduction

    The Hydra Series II Data Acquisition Unit ... 1-3 The Hydra Series II Data Logger ... 1-3 Options and Accessories ... 1-3 Applications Software ... 1-3 IEEE-488 Interface Assembly ... 1-3 Connector Set (2620A-100) ... 1-3 Accessories... 1-5 Where to go From Here... 1-5...
  • Page 20 2620A, 2625A Users Manual...
  • Page 21: The Hydra Series Ii Data Acquisition Unit

    IEEE-488 Interface. Connector Set (2620A-100) The 2620A-100 is a complete set of input connectors (one Input Module and two Digital I/O Connectors). These connectors allow for additional wiring setups so that a single Hydra Series II Data Acquisition Unit or Data Logger can then be moved among multiple installations.
  • Page 22: Hydra Features

    2620A, 2625A Users Manual Channel Scanning Can be continuous scanning, scanning at an interval time, single scans, or triggered (internal or external) scans. Channel Monitoring Make measurements on a single channel and view these measurements on the display. Channel Scanning and Monitoring View measurements made for the monitor channel while scanning of all active channels continues.
  • Page 23: Accessories

    Shielded RS-232 modem cable. Connects the instrument to a modem with properly configured DB-25 male pin connector. Use an RS40 and an RS41 cable in series to connect with an IBM PC/AT(\R). RS42 Serial printer cable. Contact Fluke for list of compatible printers. TL20 Industrial test lead set. TL70 Test lead set.
  • Page 24 Provides a quick introduction to instrument setup and operation. Chapter 1 Introduction Describes standard features, options, and accessories for the Fluke Hydra Series II Data Acquisition Unit and Hydra Series II Data Logger. Also, this chapter discusses the organization and intended uses of this manual.
  • Page 25: Overview

    Title Introduction ... 2-3 Setting Up the Instrument... 2-3 Unpacking and Inspecting the Instrument... 2-3 Adjusting the Handle ... 2-3 Line Power ... 2-4 Front/Rear Panel Features... 2-4 Input Channels ... 2-9 Operating Modes ... 2-9 Turning the Instrument On ... 2-9 Front Panel Display ...
  • Page 26 2620A, 2625A Users Manual...
  • Page 27: Introduction

    Unpacking and Inspecting the Instrument The following items are included in the shipping container: This manual Hydra Series II Starter Software Hydra Series II Data Acquisition Unit (2620A) or Hydra Series II Data Logger (2625A) Input Module Digital I/O and Alarms Connector...
  • Page 28: Line Power

    2620A, 2625A Users Manual Line Power To avoid shock hazard, connect the instrument power cord to a power receptacle with earth ground. Plug the line cord into the connector on the rear of the instrument. The instrument operates on any line voltage between 90 and 264V ac without adjustment, and at any frequency between 45 and 440 Hz.
  • Page 29: Front Panel

    REVIEW LAST FUNC ALRM 300V Mx+B CANCL INPUT TERMINALS (Channel 0) DISPLAY (See Figures 2-3, 2-4, and 2-5) ACTIVE MODE BUTTONS SINGLE ( POWER BUTTON PRINT/COMMUNICATIONS BUTTONS MODE ( COMM ( LOCAL ( INSTRUMENT CONFIGURATION BUTTONS TRIGS ( RATE ( CLOCK ( Figure 2-2.
  • Page 30: Left Display

    2620A, 2625A Users Manual REVIEW LAST REVIEW LAST REVIEW LAST FUNC SCAN ALARM AUTO Mx+B C F RO mV AC DC x1Mk Figure 2-3. Left Display FUNC SCAN ALARM AUTO Mx+B C F RO mV AC DC x1Mk Figure 2-4. Right Display...
  • Page 31: Display Annunciators

    Table 2-1. Display Annunciators Indicates that the Monitor function is enabled. SCAN Indicates that the Scan function is enabled. Scanning can be enabled as a single scan (SINGLE K Q), with a scan interval, with an alarm-triggered scan, or as an externally triggered scan.
  • Page 32: Rear View

    2620A, 2625A Users Manual "1" "2" HI, LO REVIEW MIN, MAX LAST 90-264V 50/60 Hz 15VA ALARM OUTPUTS + – + – 9-16 V DC PWR EXTERNAL BATTERY WARNING: If voltages greater than 30V are to be measured, a safety ground must be attached to the rear panel ground connector when the instrument is operated from battery power.
  • Page 33: Input Channels

    Input Channels The instrument provides one input (channel 0) on the front panel and 20 inputs (channels 1 .. 20) through a connector on the rear panel. Channels 0, 1, and 11 can measure a maximum of 300V; all other channels can measure a maximum of 150V. The maximum input that can be applied between any terminal of channels 2..10 and 12..20 is 150V dc or ac rms.
  • Page 34: Front Panel Display

    2620A, 2625A Users Manual Active Mode if this mode was in effect prior to the cycling of power. Scanning, monitoring, or combined scanning/monitoring is resumed. Inactive Mode if the instrument was in Inactive Mode or Configuration Mode prior to cycling of power.
  • Page 35: Front Panel Buttons

    Front Panel Buttons Go ahead and press any front panel button. The instrument always provides an audible response to each button press. Valid entries yield a short beep; incorrect entries yield a longer beep. Don’t worry if you press an inappropriate button and get a long beep; you can’t damage the instrument.
  • Page 36: Setting Up A Channel

    Calls up the Review array of MIN, MAX and LAST values to the display. Calls up the present Totalizer count to the display. (RS-232 only) Prints out the Last values of the Review array (2620A and 2625A) or Data Logger memory (2625A only) via the RS-232 interface.
  • Page 37 1. Select a channel to set up: Look for the desired channel number in the right display. 2. Press the following buttons to change the setup: SET and FUNC come on bright, along with the present setting for measurement function. Cycle through the choices for measurement function.
  • Page 38: Setting Alarm Limits And Mx+B Scaling Values

    2620A, 2625A Users Manual Any old alarm status/limits, Review array values, or scaling parameters are automatically cleared whenever you change a channel’s function. Setting Alarm Limits and Mx+B Scaling Values Alarm limits and Mx+B scaling values are set in a manner very similar to that used for the channel function.
  • Page 39: Mx+B Scaling

    Mx+B Scaling The menu for setting Mx+B scaling values takes you through the following steps: Set the M value (sign and number). Set the decimal point location for the M value. Set the multiplier for the M value (m, x1, k, M). Set the B value (sign and number).
  • Page 40: Using The Monitor Function

    2620A, 2625A Users Manual Using the Monitor Function The Monitor function repeatedly measures the displayed channel. Press the Monitor function. Use channels (those set to OFF) are automatically skipped over. Since the instrument cannot take measurements on a channel that has not been set up, it responds with a long beep if you try to activate the Monitor function on a channel that is defined as OFF.
  • Page 41: Viewing The Totalizer Count

    To clear out the contents of the Review array, press the display, and then select CLEAR ( array values, including the displayed value, are changed to "-----". If a scan is occurring when a review clear is requested, new review values are taken from the next scan. If the Scan function is not active, "-----"...
  • Page 42: Using The Rack Mount Kit

    2620A, 2625A Users Manual Using the Rack Mount Kit Use the M00-200-634 Rack Mount Kit to mount the instrument in a standard 19-inch rack. First, rotate the two bottom feet on the instrument 180 degrees so that the support pads point up. Then install the instrument per the instructions provided with the Rack Mount Kit.
  • Page 43: Operating The Instrument From The Front Panel

    Operating the Instrument from the Front Introduction ... 3-3 Operating Modes ... 3-3 Other Displayed Data ... 3-4 What is the Present Configuration?... 3-4 If Power is Interrupted ... 3-4 If the Configuration is Reset ... 3-4 Channel Configuration ... 3-4 Selecting Channel, Function, and Range ...
  • Page 44 2620A, 2625A Users Manual Front Panel Review Only Function... 3-26 Front Panel Monitor Only Function... 3-26 Computer Interface-Initiated Lockouts ... 3-27 REM Annunciator ... 3-27 Calibration ... 3-27...
  • Page 45: Introduction

    Introduction Chapter 3 describes how to use the instrument features that were introduced in Chapter 2. The introductory information in Chapter 2 is designed to give you a feel for the instrument’s controls and display. The information presented here in Chapter 3 adds more detail about connecting and operating the instrument.
  • Page 46: Other Displayed Data

    2620A, 2625A Users Manual Other Displayed Data An array of "MIN", "MAX", and "LAST" values for each channel is updated whenever scan measurements are taken. This Review array can be displayed from Active or Inactive (but not Configuration) Mode by pressing...
  • Page 47: Configuration Reset Settings

    Table 3-1. Configuration Reset Settings Perform a Configuration Reset to restore these conditions by pressing and holding POWER ON. Channels 0 - 20: Measurement rate: Scaling (M): (B): Alarm parameters: Alarm assignments: Scan interval time: Review values (MIN, MAX, LAST): Digital I/O lines: Totalizer: Autoprint:...
  • Page 48: Dc Voltage, Ac Voltage

    2620A, 2625A Users Manual through both a known resistance and the sensed resistance. The resulting voltages are measured and appropriate conversions are applied to the measurement, yielding a displayed output in ohms. Frequency is measured by counting cycles for a known time period. The measurement represents the frequency observed during the sampling time.
  • Page 49: Resistance

    Channel PRESS THESE BUTTONS: SELECT V DC FROM V AC THESE CHOICES: Note 1. Determine the highest resistance value anticipated for this channel. Then select a range large enough to accommodate this value. If the highest resistance cannot be anticipated, select “Auto”. Note 2.
  • Page 50: Thermocouple Temperature

    2620A, 2625A Users Manual Channel PRESS THESE BUTTONS: SELECT FROM THESE CHOICES: Note: The nine thermocouple choices and related temperature measurement ranges are: "J" Type J (-210 to 760 C) "K" Type K (-270 to 1372 C) "E" Type E (-270 to 1000 C) "T"...
  • Page 51: Setting Alarms

    Channel Function PRESS THESE BUTTONS: SELECT V DC FROM V AC THESE CHOICES: C or F Note 1. Pt selects RTD temperature measurement (DIN/IEC 751). See Table 3-5 for J, K, E, T, N, R, S, b, and C thermocouple selections. Note 2.
  • Page 52: Alarm Indications

    2620A, 2625A Users Manual Alarm evaluation is not carried out for a channel if: The limit sense is changed to "OFF". Alarm checking and the alarm limit values are re-enabled by setting limit sense to "HI" or "LO". An open thermocouple has been detected on that channel (thermocouple temperature function only).
  • Page 53: Resetting Alarm Conditions

    Alarm annunciation is disabled when the instrument is in Inactive or Configuration Mode. ALARM annunciation and evaluation follow these rules: 1. When any channel reading from the latest scan is in alarm (but the presently displayed channel is not in alarm or a scan interval countdown is in progress): "ALARM"...
  • Page 54: Mx+B Scaling

    2620A, 2625A Users Manual At any Configuration Reset (power up channels 4 through 20 are assigned to Digital I/O lines 4 through 7 in the "ORed" pattern shown in Table 3-8. These assignments can be changed via the Computer Interface. Each limit ( or ) for a channel can be assigned to any one digital output.
  • Page 55 be changed at any point is brightly lit (solid for digits, flashing for other annunciators); all other elements are dimly lit at this time. Table 3-9 presents a full description of the Mx+B configuration sequence. If you press while setting the "M" value (anytime prior to showing the "B" value), no changes entered thus far are stored.
  • Page 56: Instrument Configuration

    2620A, 2625A Users Manual Channe PRESS THESE BUTTONS: TO SELECT FROM THESE CHOICES: PRESS THESE BUTTONS: TO SELECT FROM THESE CHOICES: Note 1. Multiplier definitions: m .001 x1 1.0 k 1000 M1000000 Note 2. If your press entered thus far are stored. If you press changes to "B"...
  • Page 57: Selecting Scan Interval

    This number editing technique occurs during Configuration Mode operations whenever you are setting a numeric value. Instances of number editing include the following: R0 (RTD)Table 3-6 Alarms Table 3-7 Mx+B Scaling Table 3-9 Scan Interval TimeTable 3-10 Time/Date Table 3-13 Selecting Scan Interval The scan interval is the period between starts of measurement scans.
  • Page 58: Triggering

    2620A, 2625A Users Manual Press these buttons: To select from these choices: Triggering To set the scan triggering type from the front panel, use the procedure shown in Table 3- Press these buttons: To select from these choices: Note: The three trigger types signify: "OFF"...
  • Page 59: Setting Date And Time Of Day

    Setting Date and Time of Day The instrument features a built-in, battery-maintained clock and calendar. Verify or change the settings using the steps shown in Table 3-13. If necessary, refer to "Entering and Changing Numeric Values" for a more detailed description of the number changing technique used here.
  • Page 60: Dc Volts, Ac Volts, Frequency, And Thermocouples

    2620A, 2625A Users Manual DC Volts, AC Volts, Frequency, and Thermocouples Any analog input channel (0 through 20) can be used to measure dc volts, ac volts, or frequency. For channel 0, use the two terminals on the front panel. For channels 1 through 20, use the H (high) and L (low) inputs on the rear panel Input Module.
  • Page 61: Input Module Connections

    Operating the Instrument from the Front Panel Measurement Connections oo08f.eps Figure 3-2. Input Module Connections 3-19...
  • Page 62: Resistance And Rtd

    2620A, 2625A Users Manual Resistance and RTD For all channels (0 through 20), 2-terminal resistance or RTD measurements are allowed. Four-terminal measurements can be made on channels 1 through 10 only. Refer to Figure 3-3. For each channel configured for 4-terminal measurements (channels 1-10 only), a second channel (numbered 10 higher than the first) becomes unavailable for any other type of measurement.
  • Page 63: Terminal And 4-Terminal Connections

    2-WIRE (2T) CONNECTION 13 14 15 16 17 18 19 20 SOURCE H L H L H L H L H L H L H L H L H L (4-WIRE) SENSE H L H L H L H L H L H L H L H L H L (4-WIRE) USE H AND L TERMINALS FOR ANY CHANNEL.
  • Page 64: Totalizing

    2620A, 2625A Users Manual Totalizing General Event counting (totalizing) is commonly used on production lines for counting items. The instrument counts events by detecting low-to-high voltage transitions; each low-to- high transition increments the totalizer value by one. The maximum count is 65535;...
  • Page 65: List Button Functions

    List Button Functions If the RS-232 interface is active, you can print out the Last values from the Review array (2620A and 2625A) or all values from Data Logger memory (2625A only). This procedure is described in Table 3-16. In the LASt printout, channels that are defined as OFF are not included. Following is a...
  • Page 66: List Button Operation

    Note 2. "LASt" prints out all values in the Review array. Review array values are not affected. An error results if Review array data has been cleared. "StorE" prints out logged scan data from the Hydra Data Logger (2620A) memory. Logged data is not affected. An error results if there is no logged data.
  • Page 67: Autoprint

    Autoprint The front panel setup procedure is summarized in Table 3-17. Begin this procedure by selecting MODE ( "Print" (left display). For the Hydra Series II Data Logger, a destination of "both" can also be selected, allowing for simultaneous printing and storage. (For the Hydra Series II Data Acquisition Unit, "Print"...
  • Page 68: Front Panel Lock Out Conditions

    2620A, 2625A Users Manual Press these MODE buttons:P To select from these choices: Note 1. “Print” “StorE” “both” Note 2. “ALL” “ALAr” “trAnS” To Initiate Hold , and press “CLEAr” appears in right display Front Panel Lock out Conditions Various methods are available to prevent accidental use of the front panel buttons. These actions can be initiated from either the front panel or the computer interface.
  • Page 69: Computer Interface-Initiated Lockouts

    can now be used to change the monitored channel. All other front panel buttons are locked out; a long beep results from their use. Press both to deactivate the Monitor Only function and return the instrument to normal front panel button operation (regular Monitor Function on.) Computer Interface-Initiated Lockouts Front Panel lockout can also be specified over the Computer Interface with the following...
  • Page 70 2620A, 2625A Users Manual 3-28...
  • Page 71: Using The Computer Interface

    Using the Computer Interface Title Introduction ... 4-3 Front Panel and Computer Interface Operations... 4-3 Types of Computer Interface ... 4-3 Using the RS-232 Computer Interface ... 4-3 Setting Communication Parameters (RS-232) ... 4-4 Autoprint and Memory Storage (RS-232)... 4-5 Autoprint: Computer Interface Control ...
  • Page 72 2620A, 2625A Users Manual Status Byte Register... 4-19 Reading the Status Byte Register ... 4-20 Service Request Enable Register ... 4-21 Instrument Event Register ... 4-21 Computer Interface Command Set ... 4-22...
  • Page 73: Introduction

    This chapter assumes you are familiar with the basics of data communication, the RS- 232 interface, and/or the IEEE-488 bus. For an introduction to the IEEE-488 interface, request Fluke Application Bulletin AB-36, "IEEE Standard 488-1978 Digital Interface for Programmable Instrumentation."...
  • Page 74: Rs-232 Setup

    Note: If “IEEE” is selected here (2620A only), the RS-232 setup sequence is exited and the IEEE setup sequence is begun. Refer to Table 4-3. 1. Select COMM (K L). 2. The baud rate presently selected is now shown in the left display, and "bAUd" is shown in the right display.
  • Page 75: Autoprint And Memory Storage (Rs-232)

    5. Press G or D to scroll to odd, even, or no parity, respectively. Press EE to select the displayed parity. 6. "Echo" now appears in the right display, with "On" or "OFF" appearing on the left display. When Echo is "On", each character sent to the instrument over the RS-232 interface is "echoed"...
  • Page 76: Memory Storage: Computer Interface Control

    2620A, 2625A Users Manual 10:33:45 5/11/90 Lines following the time and date contain measurement data for channels that have been set up for this session. The last line of the printout contains the Totalizer count and the status of the digital I/O lines.
  • Page 77: Memory Full Operation

    Data for the oldest set of scan readings in Hydra Series II Data Logger memory can be retrieved with the LOG? query. Each set of scan readings is cleared from memory when read with LOG? The LOG? query returns the following information: Date and time at the start of the logged scan.
  • Page 78: Installation Test

    To connect the instrument to a specific brand of RS-232 printer, use the cable that would be used to connect that printer to an RS-232 port on an IBM PC/AT (DB-9 connector). The RS42 cable is compatible with most serial printers; contact Fluke for printer compatibility information.
  • Page 79: Rs-232 Prompts

    Series II with 2620A-05K) supports the IEEE-488 capabilities shown in Table 4-2. Installing the IEEE-488 Interface The following instructions pertain to the 2620A/05 Data Acquisition Unit or a Hydra Series II Data Acquisition Unit equipped with a 2620A-05K IEEE-488 kit. A standard IEEE-488 cable attaches to the instrument rear panel.
  • Page 80: Sample Program

    2620A, 2625A Users Manual 10 ’ EXAMPLE.BAS 20 ’ 30 ’ 40 ’ Hydra must be set up for RS232, 9600 baud, no parity (from front panel) 50 KEY OFF 60 ’ Open communications port 9600 baud, no parity, 8 bit data, 70 ’...
  • Page 81 PRINT #1, "FUNC " + STR$(I) + "," + CMD$ GOSUB 800 520 NEXT I 530 ’ 540 LOCATE 23,1 550 PRINT "Measuring " + CMD$ + " 560 ’ 570 FOR I = 1 TO 3 PRINT #1, "*TRG" GOSUB 800 PRINT #1, "SCAN_TIME? : GOSUB 800 ’...
  • Page 82: Enabling The Ieee-488 Interface

    2620A, 2625A Users Manual Capability SH1 and AH1 Enabling the IEEE-488 Interface The IEEE-488 interface can be enabled only from the front panel, using the following procedure. This procedure is also summarized in Table 4-3. Press these COMM buttons: To select...
  • Page 83: Installation Test

    IEEE-488 operations: This is a program as entered from a Fluke 1722A Instrument Controller using Fluke BASIC commands. Syntax may vary with the host computer and language.
  • Page 84: Input Strings

    LF (Line Feed) In some instances, a terminator is automatically transmitted by the host at the end of the command string (i.e., the instrument’s input string). For example, in Fluke BASIC, the PRINT statement finishes with a CR LF pair.
  • Page 85: Typical Input Strings

    Select ohms function for channel 1 Select 30-kilohm range Select 2-wire (2T) connections Select temperature measurement for channel 12 Select K-type thermocouple input Select temperature measurement for channel 1 Select RTD (DIN/IEC 751) Select 2-wire (2T) connections Set new R0 value for channel 12 Set interval between scan starts to 10 minutes Start scanning Return measured values for all scanned channels...
  • Page 86: Sending Numeric Values To The Instrument (Rs-232 And Ieee-488)

    2620A, 2625A Users Manual Sending Numeric Values to the Instrument (RS-232 and IEEE-488) Numeric values can be sent to the instrument as integers, real numbers, or real numbers with exponents, as shown in the following examples: EXAMPLE +12345 123.45 -1.2345E2...
  • Page 87: Service Requests (Ieee-488 Only) And Status Registers

    loaded, the Message Available (MAV) bit in the Status Byte Register is set true. (For more information, see "Status Byte Register" later in this chapter.) Numeric output from the instrument is returned as shown in the following examples: Integer Values Examples In response to RANGE? query, range is 3 for the selected function.
  • Page 88 Standard Event Status Register Read Using & & & & & & & & Standard Event Status Enable Register Read Using Write to Using Service Request Generation & & & & & & ESR? & Queue Not-Empty ESE? Output Queue Read by Serial Poll Status Byte Register Read Using...
  • Page 89: Event Status And Event Status Enable Registers

    Name Instrument Event Bit. When any bit in the Instrument Event Register is set and the corresponding mask bit(s) in the Instrument Event Enable register is set, this Instrument Event Bit in the Status Byte will be set. When read, the Instrument Event Bit is recomputed based on the new value from the Instrument Event Register and its mask, the Instrument Event Enable Register.
  • Page 90: Reading The Status Byte Register

    2620A, 2625A Users Manual Name not used not used Reading the Status Byte Register The host can read the Status Byte Register by taking a serial poll or by sending the instrument a *STB? query. The value of the status byte is not affected by the *STB? query.
  • Page 91: Service Request Enable Register

    Service Request Enable Register The Service Request Enable Register (SRE) is an 8-bit register that enables or disables (i.e., masks) corresponding summary messages in the Status Byte Register (STB). The instrument can be programmed to make a service request on errors or when output is available.
  • Page 92: Computer Interface Command Set

    2620A, 2625A Users Manual Whenever the Instrument Event Register is read, the condition bits are cleared. This register is used in conjunction with the Instrument Event Enable Register to determine the conditions under which the Instrument Event Bit of the Status Byte is set.
  • Page 93: Command And Query Summary

    Table 4-7. Command and Query Summary Alarms ALARMS? Active Alarms Query ALARM_ASSOC Associate Alarm Output ALARM_ASSOC? Alarm Association Query ALARM_ASSOC_CLR Clear Alarm Association ALARM_DO_LEVEL Set Alarm Output Level ALARM_DO_LEVELS? Alarm Output State Query ALARM_LIMIT Set Alarm Limit ALARM_LIMIT? Alarm Limit Assignments Query Digital I/O DIO_LEVELS? Digital I/O State Query...
  • Page 94 2620A, 2625A Users Manual Lock LOCK LOCK? Measurement Rate RATE RATE? Measurement Values LAST? MAX? MIN? NEXT? Monitor MON_CHAN? MON_VAL? Mx+B Scaling SCALE_MB SCALE_MB? RS-232 Commands (includes Autoprint) LOG? LOG_CLR LOG_COUNT? LOG_MODE LOG_MODE? LOGGED? LOG_BIN? PRINT PRINT? PRINT_TYPE PRINT_TYPE? LOCS...
  • Page 95 Table 4-7. Command and Query Summary (cont) Response Format FORMAT Response Format FORMAT? Query Response Format Review Array REVIEW_CLR Clear Review Values Scan INTVL Set Scan Interval INTVL? Scan Interval Query SCAN Enable/Disable Scanning SCAN? Return Scan Status SCAN_TIME? Time of Scan Temperature Unit TEMP_CONFIG Temperature Configuration...
  • Page 96: Command And Query Reference

    FIELD DESCRIPTION Manufacturer’s name (FLUKE). Instrument model number (2620A or 2625A). Firmware revision levels. As an example, for main software version M2.41, display software version D1.3, A/D software version A3.7, the response would be: FLUKE,2620A,0,M2.41 A3.7 D1.3 Operation Complete Causes the instrument to generate an Operation Complete when parsed.
  • Page 97 Table 4-8. Command and Query Reference (cont) *SRE Service Request Enable Sets the Service Request Enable Register to the given value. *SRE <value> If the value is greater than 255, a Command Error is generated. The value of bit 6 is ignored, since it is not used by the Service Request Enable Register.
  • Page 98 2620A, 2625A Users Manual ALARMS? ALARM_ASSOC 4-28 Table 4-8. Command and Query Reference (cont) Active Alarms Query Returns alarm status for the indicated channel(s). The value returned represents data from the most recent scan. The most recent scan is the scan in progress or, if scanning is not in progress, the last completed scan.
  • Page 99 Table 4-8. Command and Query Reference (cont) ALARM_ASSOC? Alarm Association Query Returns alarm output associations for the indicated channel and alarm limit. ALARM_ASSOC? <channel>,<limit_num> <channel> = (4 .. 20) <limit_num> = 1 2 Returns the digital output line number associated with the indicated alarm limit.
  • Page 100 2620A, 2625A Users Manual ALARM_LIMIT ALARM_LIMIT? DATE 4-30 Table 4-8. Command and Query Reference (cont) Set Alarm Limit Store alarm limit information for the indicated channel and limit. The fields to be given (in order) are: ALARM_LIMIT <channel>,<limit_num>,<sense>,<value> <channel> = (0 .. 20) <limit_num>...
  • Page 101 Table 4-8. Command and Query Reference (cont) DIO_LEVELS? Digital I/O State Query Returns digital input and output levels for the eight configurable digital I/O lines. Returns an integer value representing the actual states of the digital I/O lines. The low-order eight bits are used to indicate the status of each configurable I/O line (0 indicates low;...
  • Page 102 2620A, 2625A Users Manual FORMAT? FUNC 4-32 Table 4-8. Command and Query Reference (cont) MEASUREMENT UNITS STRING Scaled “MX+B” Volts DC “VDC” Volts AC “VAC” Resistance “OHMS” Frequency “Hz” Temperature “C” Temperature “F” Query Response Format Returns the format presently in use: The default.
  • Page 103 Table 4-8. Command and Query Reference (cont) For temperature functions, the "range" is a thermocouple type (J, K, E, T, N, R, S, B, C) or DIN/IEC 751 RTD (PT). Use of any other value causes an Execution Error. <terminals> = Specification of terminals is necessary when the function type is OHMS or when an RTD temperature measurement is being defined.
  • Page 104 2620A, 2625A Users Manual IEE? IER? INTVL INTVL? LAST? 4-34 Table 4-8. Command and Query Reference (cont) Instrument Event Enable Query Returns the present value of the Instrument Event Enable Register as an integer. Instrument Event Register Query Returns the value of the Instrument Event Register as an integer, then clears all bits.
  • Page 105 Table 4-8. Command and Query Reference (cont) LOCK Lock the instrument front panel so that only use of the arrow keys and the simultaneous use of LOCK commands are recognized: Unlock Lock and begin review. If the instrument is not in review, a review is begun (even if there are no defined channels.) Monitor lock.
  • Page 106 2620A, 2625A Users Manual LOGGED? LOG_BIN? LOG_CLR LOG_COUNT? 4-36 Table 4-8. Command and Query Reference (cont) The Totalizer count is returned as a scientific notation value in the range 0 through 65535 (00.000E+3 through 65.535E+3). If the Totalizer has overflowed, a value of 1E+9 is returned.
  • Page 107 Table 4-8. Command and Query Reference (cont) LOG_MODE Determines treatment of new scan data when memory is full (RS-232 only) LOG_MODE <mode> 0 Wrap around. When memory is full, oldest scans are discarded to make room for new scans. This is the default mode. 1 Discard new scans.
  • Page 108 2620A, 2625A Users Manual MIN? MON_CHAN? MON_VAL? 4-38 Table 4-8. Command and Query Reference (cont) Channel’s Minimum Value Returns minimum value(s) for channels measured in the most recent scan. The value returned represents data from the most recent scan. The most recent scan is the scan in progress or, if scanning is not in progress, the last completed scan.
  • Page 109 An Execution Error is generated if any other value is used, if this command is used with a 2620A and you attempt to select STORE SCANS or BOTH. The Hydra Data Logger can hold 2047 scans, with each scan containing 21 channels of data.
  • Page 110 2620A, 2625A Users Manual PRINT_TYPE? RANGE? RATE RATE? 4-40 Table 4-8. Command and Query Reference (cont) Data Logging Type Query (RS-232 only) Return the Autoprint or internal Memory Storage type and the type of scan data logged. Returns 0 (AUTOPRINT), 1 (STORE), OR 2 (BOTH), and 0 (ALL), 1 (ALARM), or 2 (TRANS).
  • Page 111 Table 4-8. Command and Query Reference (cont) REMS Remote without Lockout (RS-232 only) Enter the IEEE-488.1 remote without front panel lockout (REMS) state. The REM annunciator is lit, and only the following three front panel buttons are now active (with special REMS functionality): triggers a single scan.
  • Page 112 2620A, 2625A Users Manual RWLS SCALE_MB 4-42 Table 4-8. Command and Query Reference (cont) Remote with Lockout (RS-232 only) Enter the IEEE-488.1 remote with front panel lockout (RWLS) state. All front panel buttons are disabled, and the REM annunciator is lit.
  • Page 113 Table 4-8. Command and Query Reference (cont) SCALE_MB? Mx+B Scaling Values Query Return the M and B scaling values for the indicated channel. SCALE_MB? <channel> If the channel number given is invalid, an Execution Error is generated. Remember that Mx+B scaling values are automatically reset to 1 (M) and 0 (B) when the function for that channel is changed.
  • Page 114 2620A, 2625A Users Manual TEMP_CONFIG? TIME TIME_DATE? 4-44 Table 4-8. Command and Query Reference (cont) Use the lowest two bits of the value given as individual flags to specify the temperature configuration. Therefore, the value given must be in the range from 0 through 3 or an Execution Error is generated.
  • Page 115 Table 4-8. Command and Query Reference (cont) TOTAL Set Totalizer Count Give the Totalizer count a new initial value. TOTAL <t_value> If the value is not in the range 0 through 65,535, an Execution Error is generated. Clear the Totalizer count by setting the Totalizer to zero (0). TOTAL? Totalizer Value Query Returns the value of the present Totalizer count.
  • Page 116 2620A, 2625A Users Manual TRIGGER? 4-46 Table 4-8. Command and Query Reference (cont) Trigger Type Query Returns an integer representing the present trigger type: (off) (on) (alarm)
  • Page 117: Additional Considerations

    Additional Considerations Title Introduction ... 5-3 Measurement Rate... 5-3 Advanced Trigger Mechanisms... 5-3 Front Panel Trigger Control... 5-3 Computer Interface Trigger Control ... 5-3 Both External and Monitor Alarms Disabled (Type 0) ... 5-4 External Trigger Enabled (Type 1) ... 5-4 Monitor Alarm Enabled (Type 2) ...
  • Page 118 2620A, 2625A Users Manual...
  • Page 119: Introduction

    Introduction Chapter 5 discusses some topics that will help you use the instrument more effectively. These considerations assume that you are familiar with the basic operation of the instrument and have some basic understanding of electronics. Measurement Rate The two measurement rates provide a choice of maximum accuracy and noise rejection (slow rate) or maximum throughput (fast rate).
  • Page 120: Both External And Monitor Alarms Disabled (Type 0)

    2620A, 2625A Users Manual Verify the trigger type over the computer interface by sending the query: TRIGGER? Single scans can be triggered via the RS-232 interface or the IEEE-488 interface by sending the *TRG command. Note that the IEEE-488 interface GET command can be used only when the IEEE-488 interface is enabled.
  • Page 121: External Trigger Timing

    ALARM OUTPUTS + – 1 2 3 TR + – 1 2 3 TR 9-16 V DC PWR 7.0V HIGH 2.0V 0.8V –0.6V Figure 5-1. External Trigger Timing Advanced Trigger Mechanisms DIGITAL I/O 0 1 2 3 4 5 6 7 +30V VALID EXTERNAL TRIGGERS...
  • Page 122: Monitor Alarm Enabled (Type 2)

    2620A, 2625A Users Manual Monitor Alarm Enabled (Type 2) This corresponds to the Front Panel ALAr or Computer Interface TRIGGER=2 setting. When the Monitor Alarm trigger is enabled and the Monitor function is on, a scan is triggered if the monitor measurement is found to be in alarm. After this scan occurs, a monitor measurement is again made.
  • Page 123: T And 4T-Connections

    2-WIRE (2T) CONNECTION 13 14 15 16 17 18 19 20 SOURCE H L H L H L H L H L H L H L H L H L (4-WIRE) SENSE H L H L H L H L H L H L H L H L H L (4-WIRE) USE H AND L TERMINALS FOR ANY CHANNEL.
  • Page 124: True Rms Measurements

    2620A, 2625A Users Manual 3.0000 k 30.000 k 300.00 k 3.0000 M 10.000 M 4-Terminal Configuration In 4-terminal configuration, the instrument uses a second pair of leads to automatically eliminate measurement-lead and internal-relay resistance errors. With measurement lead and internal relay resistances eliminated, this configuration yields the most accurate readings.
  • Page 125: Making Mixed Measurements

    average-responding measurement devices display the correct rms reading of 1.0000V (the dc component equals 0). However, consider the 2V (peak-to-peak) square wave. Both types of measurement correctly display the dc component (0V), but the instrument also correctly measures the ac component (1.0000V). The average-responding device measures 1.111V, which amounts to an 11% error.
  • Page 126: Comparison Of Common Waveforms

    2620A, 2625A Users Manual AC-COUPLED INPUT WAVEFORM SINE PK-PK RECTIFIED SINE (FULL WAVE) PK-PK RECTIFIED SINE (HALF WAVE) PK-PK SQUARE PK-PK RECTIFIED SQUARE PK-PK RECTANGULAR PULSE PK-PK D = X/Y K = D-D TRIANGLE SAWTOOTH PK-PK RMS CAL IS THE DISPLAYED VALUE FOR AVERAGE RESPONDING INSTRUMENTS THAT ARE CALIBRATED...
  • Page 127: Using Shielded Wiring

    If non-isolated sensors are used, (e.g. a thermocouple probe where the sensor and its shield are electrically connected), try leaving the shield disconnected (open) at the 2620A-100 Input Module. Isolated and Shielded Sensor Configuration The following suggestions rely on the shield being kept...
  • Page 128: In More Detail

    2620A, 2625A Users Manual 1. Connect the shield to L (low) at the 2620A-100 Input Module, and try connecting the sensor shield to a quiet earth ground at or very near the measurement sensor end (and at only one place), or 2.
  • Page 129: Maintenance

    Introduction ... 6-3 Cleaning... 6-3 Line Fuse ... 6-3 Self-Test Diagnostics and Error Codes ... 6-3 Performance Tests ... 6-4 Accuracy Verification Test ... 6-7 Channel Integrity Test... 6-7 Thermocouple Measurement Range Accuracy Test ... 6-9 4-Terminal Resistance Test... 6-10 Thermocouple Temperature Accuracy Test...
  • Page 130 2620A, 2625A Users Manual...
  • Page 131: Introduction

    Service Manual. Otherwise, package the instrument securely (using the original container if available.) Then forward the package, postage paid, to the nearest Fluke Service Center. Include a brief description of the problem. Fluke assumes no responsibility for damage in transit.
  • Page 132: Performance Tests

    If the instrument fails any of these performance tests, calibration adjustment and/or repair is needed. To perform these tests, you will need a Fluke 5700A Multifunction Calibrator or equipment meeting the minimum specifications given in Table 6-2. –...
  • Page 133: Power-Up Error Codes

    All measurements listed in the performance test tables are made in the slow reading rate unless otherwise noted. The 2620A/2625A instrument contains high voltages that can be dangerous or fatal. Only qualified personnel should attempt to service the instrument. Turn off the Hydra Series II and remove all power sources before performing the following procedures.
  • Page 134: Recommended Test Equipment

    Type K Thermos bottle and cap Measures +5V dc Sinewave, 0.5 to 1V rms 10 Hz to 5 kHz Alternate Equipment List Fluke 5440B Fluke 5100B (for AC Volts only) Philips PM5193 or Fluke 6011A Recommended Model Fluke 5700A Accuracy 0.05%...
  • Page 135: Accuracy Verification Test

    Accuracy Verification Test 1. Power up the instrument and allow it to temperature stabilize for 1/2 hour. 2. Connect a cable from the Output VA HI and LO connectors of the 5700A to the V and COM connectors on the front panel of the Hydra Series II Instrument. Select the channel 0 function and range on the Hydra Series II and the input level from the 5700A using the values listed in Table 6-3.
  • Page 136: Performance Tests (Voltage, Resistance, And Frequency)

    2620A, 2625A Users Manual Table 6-3. Performance Tests (Voltage, Resistance, and Frequency) Function DC Volts Voltages greater than 150V can only be applied to channels 0,1, and 11. Voltages greater than 150V can only be applied to channels 0, 1, and 11. The rear Input Module must be installed when measuring ac volts on channel 0.
  • Page 137: Thermocouple Measurement Range Accuracy Test

    Table 6-3. Performance Tests (Voltage, Resistance, and Frequency) (cont) Using inputs in decades of 1.9: 30 k 300 k Using inputs in decades of 1: 30 k 300 k 10 M * *Optional test point if standards available. All channels (0 through 20) can accommodate 2-terminal resistance measurements. Channel 0, with only two connections, cannot be used for 4-terminal measurements.
  • Page 138: 4-Terminal Resistance Test

    2620A, 2625A Users Manual 3. Connect a cable from the Output VA HI and LO connectors of the 5700A to the V and COM connectors on the front panel of the Hydra Series II Instrument. 4. Set the 5700A to output 0V dc 5.
  • Page 139: Thermocouple Temperature Accuracy Test

    4-terminal connections are made using pairs of channels. 4-terminal measurements can only be made on channels 1 through 10. The accompanying pairs are channels 11 through 20. Thermocouple Temperature Accuracy Test Assure the Thermocouple Measurement Range Accuracy Test meets minimum acceptable levels before performing this test.
  • Page 140: Terminal Connections To 5700A

    2620A, 2625A Users Manual SOURCE (4-WIRE) SENSE (4-WIRE) 6-12 13 14 15 16 17 18 19 20 H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L...
  • Page 141: Open Thermocouple Response Test

    SOURCE (4-WIRE) SENSE (4-WIRE) Figure 6-3. 4-Terminal Connections to Decade Resistance Box Table 6-4. Performance Tests for Thermocouple Temperature Function (IPTS-68/ITS-90) Thermocouple Type Open Thermocouple Response Test 1. Switch OFF power to the instrument and disconnect all high voltage inputs. 2.
  • Page 142: Rtd Temperature Accuracy Test

    2620A, 2625A Users Manual RTD Temperature Accuracy Test The following two RTD Temperature Accuracy Tests are different in that one uses a Decade Resistance Source and the other uses an RTD. Only one of the tests need to be performed to assure operation.
  • Page 143: Rtd Temperature Accuracy Test (Using Din/Iec 751)

    RTD Temperature Accuracy Test (Using DIN/IEC 751) 1. Switch OFF power to the instrument and disconnect all other high voltage inputs. 2. Remove the Input Module from the rear of the instrument. Open the Input Module and connect a Platinum RTD, conforming to the European Standards IEC 751 (DIN 43760).
  • Page 144: Digital Output Test

    2620A, 2625A Users Manual Digital Output Test 1. Ensure that communication parameters (i.e., transmission mode, baud rate, parity, and echo mode) on the Hydra Series II and the host are properly configured to send and receive serial data. Refer to Chapter 4.
  • Page 145: Totalizer Test

    Total input. The test requires computer interfacing with a host (terminal or computer). The host must send commands to the 2620A/2625A instrument to control the digital line for this test. Refer to Chapter 4 for a description of configuring and operating the Hydra Series II instrument.
  • Page 146: Totalizer Sensitivity Test

    2620A, 2625A Users Manual 5. Press the TOTAL button on the front panel of Hydra Series II. Assure Hydra Series II displays a 0 value. 6. Jumper output 0 to the Total ( ) input by connecting the ( ) terminal test lead to output 0’s test lead.
  • Page 147: Dedicated Alarm Output Test

    Hydra Series II’s display should now show the totalizing value incrementing at a 10 count per second rate. Dedicated Alarm Output Test The Dedicated Alarm Output Test verifies that Alarm Outputs 0 through 3 are functioning properly. Because this test is dependent on voltage readings the Accuracy Verification Test for channel 0 and the Channel Integrity Test for channels 1 through 3 should be performed if voltage readings are suspect.
  • Page 148: Dedicated Alarms Output Test

    2620A, 2625A Users Manual ALARM OUTPUT CONNECTOR HYDRA FRONT PANEL 300V (USE STACKED BANANA JACKS) 6-20 ALARM OUTPUTS + – 1 2 3 TR + – 1 2 3 TR 0 1 2 3 4 5 6 7 +30V 9-16 V...
  • Page 149: External Trigger Input Test

    Ensure the scan continues to execute at its specified interval. Calibration Refer to the Fluke Hydra Series II Service Manual (P/N 688868) for calibration procedures. The instrument must be stabilized in an environment with ambient temperature of 22 to 24ºC and relative humidity of less than 70% and have been turned on for at least 1/2 hour prior to calibration.
  • Page 150: Variations In The Display

    If the problem cannot be remedied, forward the instrument, postage paid, to the nearest Fluke Service Center. Be sure to pack the instrument securely; use the original container if available. Include a brief description of the problem. Fluke assumes NO responsibility for damage in transit.
  • Page 151: Appendices

    Appendix Specifications... A-1 ASCII & IEEE-488 Bus Codes ... B-1 IEEE-488.2 Devise Documentation Requirements... C-1 Making Mixed Measurements ... D-1 Binary Upload of Logged Data (LOG_BIN?) (2625A only)... E-1 RS-232 Cabling... F-1 Appendices Title Page...
  • Page 153: A Specifications

    Introduction The instrument specifications presented here are applicable within the conditions listed in the Environmental chapter. The specifications state total instrument accuracy following calibration, including: A/D errors Linearization conformity Initial calibration errors Isothermality errors Relay thermal emf’s Reference junction conformity Temperature coefficients Humidity errors Sensor inaccuracies are not included in the accuracy figures.
  • Page 154 2620A/2625A Users Manual DC Voltage Inputs Range 300 mV 30 V 300 V Range 90 Days, Slow 300 mV 0.018% + 20 µV 0.019% + 0.2 mV 0.019% + 2 mV 150/300V 0.019% + 20 mV Input Impedance 100 Me minimum in parallel with 150 pF maximum for all ranges 3V and below 10 Me...
  • Page 155 Thermocouple Inputs Temperature Measurements - Accuracy (Thermocouples) (IPTS-68) Thermocouple Type Temperatur 90 Days e (C°) Slow -100 to -30 0.43 -30 to 150 0.38 150 to 760 0.43 -100 to -25 0.52 -25 to 120 0.43 120 to 1000 0.60 1000 to 1372 0.98 -100 to -25...
  • Page 156 2620A/2625A Users Manual Temperature Measurements - Accuracy (Thermocouples) (ITS-90) Thermocouple Type Temperatur (°C) (°C) -100 to -30 -30 to 150 150 to 760 -100 to -25 -25 to 120 120 to 1000 1000 to 1372 -100 to -25 -25 to 120...
  • Page 157 Input Impedance 100 M minimum in parallel with 150 pF maximum Common Mode and Normal Mode Rejection See Specifications, DC Voltage Inputs Cross-Talk Rejection Refer to Appendix D Open Thermocouple Detect Small ac signal injection and detection scheme before each measurement detects greater than 1 to 4 k as open.
  • Page 158 2620A/2625A Users Manual Temperature Resolution (°C) Slow -200.00 0.02 0.00 0.02 100.00 0.02 300.00 0.02 600.00 0.02 * Sensor inaccuracies are not included 2-Wire Accuracy For 2-wire sensors with R degrade accuracy an additional 11ºC for channels 1 to 20 and 0.05ºC for channel 0.
  • Page 159 Range Frequency 20 Hz - 50 Hz 1.43% + 0.25 mV 50 Hz - 100 Hz 0.30% + 0.25 mV 300 mV 100 Hz - 10 kHz 0.16% + 0.25 mV 10 kHz - 20 kHz 0.37% + 0.25 mV 20 kHz - 50 kHz 1.9% + 0.30 mV 50 kHz - 100 kHz...
  • Page 160 2620A/2625A Users Manual Frequency 20 Hz - 50 Hz 50 Hz - 100 Hz 100 Hz - 10 kHz 10 kHz - 20 kHz 20 kHz - 50 kHz 50 kHz - 100 kHz Input Impedance 1 M in parallel with 100 pF maximum Maximum Maximum Crest Factor 2.0 for rated accuracy...
  • Page 161 Ohms Inputs Range Resolution Slow Fast 10 m 30 k 300 k 10 M 10 k Range 18°C to 28°C 90 Days, Slow 1 Year, Slow 0.013% + 20 m 0.014% + 20 m 0.015% + 0.2 0.016% + 0.2 30 k 0.013% + 2 0.014% + 2...
  • Page 162 2620A/2625A Users Manual Frequency Inputs Frequency Range 15 Hz to greater than 1 Mhz Range 15 Hz - 900 Hz 9 kHz 90 kHz 900 kHz 1 MHz Sensitivity Frequency 15 Hz - 100 kHz 100 kHz - 300 kHz...
  • Page 163 Typical Scanning Rate See table below. The measurement conditions are: averaged rate over 20 scans; continuous scanning; alarm limits and Mx+B scanning set on all channels; logging data to internal memory; and RS-232 communications set at 9600 baud. Measurements were taken with short-circuit inputs on all channels, except frequency, which was taken with 5V at 15 Hz on all channels.
  • Page 164: Digital Inputs

    2620A/2625A Users Manual Maximum Autoranging Time (Seconds per Channel) Function 300 mV 150 V 300 mV 300 mV 150 V 300 mV Ohms 10.0 M Totalizing Input Input Voltage 30V maximum 4V minimum 2V peak minimum signal Isolation None dc-coupled Threshold 1.4V...
  • Page 165 Isolation none dc-coupled Threshold 1.4V Hysteresis 500 mV Trigger Input Input Voltages contact closure and TTL compatible “high” =2.0V min, 7.0V max “low” = -0.6V min, 0.8V max Isolation None dc-coupled Minimum Pulse Width 5 µs Maximum Frequency 5 Hz Specified Conditions The instrument must be in the quiescent state, with no interval scans in process, no commands in the queue, no RS-232 or IEEE interface activity, and no front panel...
  • Page 166 2620A/2625A Users Manual Digital and Alarm Outputs Output Logic Levels Logical “zero”: Logical “one”: For non-TTL loads: 1.8V max for an Iout or -20 mA Logical “zero”: Isolation none Real-Time Clock and Calendar Accuracy Within 1 minute per month for 0°C to 50°C range...
  • Page 167 Altitude Operating: 2,000 m maximum Non-operating: 12,200 m maximum Vibration 0.7 g at 15 Hz 1.3 g at 25 Hz 3 g at 55 Hz Shock 30 g half sine per Mil-T-28800 Bench handling per Mil-T-28800 General Channel Capacity 21 Analog Inputs 4 Alarm Outputs 8 Digital I/O (inputs/outputs) Measurement Speed...
  • Page 168 Status of the eight digital I/O Totalizer count Memory is battery-backed Memory life: 5 years minimum at 25°C 2620A Options IEEE-488 (Option -05k) Capability codes: SH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT1, E1, TE0, LE0, and C0 Complies with IEEE-488.1 standard.
  • Page 169: B Ascii & Ieee-488 Bus Codes

    Appendix B ASCII & IEEE-488 Bus Codes...
  • Page 170 2620A/2625A Users Manual BITS CONTROL 0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0...
  • Page 171: C Ieee-488.2 Devise Documentation Requirements

    (In this context, "device" means the Fluke 2620A Hydra Series II Data Acquisition Unit. The Fluke Hydra Series II Data Logger cannot be equipped for IEEE-488 operation.) The information in Appendix C is provided in compliance with this requirement.
  • Page 172 2620A/2625A Users Manual Measurement rate: Slow. Scaling (M):1 (all channels) Offset (B): 0 (all channels) Alarm parameters: Limit-1 and Limit-2 OFF. All limit values 0. Alarm assignments: Channels 0-3 assigned to outputs 0-3,respectively. Channels 4-20 assigned to digital I/O lines 4-7, as shown in Table 3-8.
  • Page 173 <PROGRAM MESSAGE UNIT> <PROGRAM MESSAGE UNIT SEPARATOR> <COMMAND MESSAGE UNIT> <QUERY MESSAGE UNIT> <COMMAND PROGRAM HEADER> <QUERY PROGRAM HEADER> <PROGRAM DATA> <CHARACTER PROGRAM DATA> <DECIMAL NUMERIC PROGRAM DATA> 7. A description of any buffer size limitations related to block data, Section 7.7.6.5. No block data is used.
  • Page 174 16. A description of the response to the identification common query, *IDN?, Section 10.14. The *IDN? query returns: FLUKE,2620A,0,M2.41 A3.7 D1.3 The version number of the main software is "M2.41", "A3.7" is the version number of the analog sub-system software, and "D1.3" is the version number of the display sub- system software.
  • Page 175 22. For each command, a statement describing whether is overlapped or sequential. All commands are sequential; none are overlapped. 23. For each command, the device documentation shall specify the functional criteria that are met when an operation complete message is generated in response to that command, Section 12.8.3.
  • Page 176 2620A/2625A Users Manual...
  • Page 177: D Making Mixed Measurements

    Making Mixed Measurements Introduction This appendix augments the discussion of ac signal effects on other channels (cross talk) found in Chapter 5 ("Making Mixed Measurements"). Effects on each measurement function are discussed below. These numbers should only be considered as references. Since cross talk can be introduced into a measurement system in many places, each setup must be considered individually.
  • Page 178 2620A/2625A Users Manual AC Signal Cross Talk Into an AC Voltage Channel ACV Error Ratio = Range v Hz 30.000 V 1.2 10 150.00/300.00 1.2 10 For example, to find the typical effect of a 60 Hz, 220V ac signal on another channel for the 300 mV range, you would calculate: 220 X 60 X 1.4 X 10...
  • Page 179 AC Signal Crosstalk Into a Temperature Channel Frequency = 50, 60 Hz TEMPERATURE Error Ratio = Types J, K, E, T, N: Types R, S, B, C: Type PT (RTD): C error VACrms crosstalk Worst case Typical 2.7 10 5.0 10 Vrms 1.1 10 2.0 10...
  • Page 180 2620A/2625A Users Manual...
  • Page 181: E Binary Upload Of Logged Data (Log_Bin?) (2625A Only

    Binary Upload of Logged Data Introduction The LOG_BIN? <index> query can be used to quickly upload logged data from a 2625A. The response is a single ASCII string, which encodes the raw binary data stored at the specified <index> position. The logged data is also retained in the 2625A. The measurement data returned from the 2625A is in the (binary) IEEE single-precision floating point format.
  • Page 182: E-1. Ascii String Decoding

    2620A/2625A Users Manual -* decode(): Decode LOG_BIN? response string into raw byte stream ** Decoding is done on multiples of four input bytes: ** Inputs: ** Outputs: ** Returns: decode(dst, src) unsigned char *dst; char *src; /* src to dst xlate */...
  • Page 183 The raw data output array contains the information listed below. Note that the number of floating point values is equal to the number of channels in use, plus one. (The totalizer count is always present in the data, and is stored as a floating point number.) Time stamp (BCD format) byte0: hours byte1: minutes...
  • Page 184: E-1. Floating Point Format

    2620A/2625A Users Manual The floating point format used is 32-bit with a 1-bit sign, 8-bit exponent, and 24-bit mantissa with the most significant bit hidden under the LSB of the exponent. The number is formatted as shown in Table F-1.
  • Page 185: E-2. Floating Point Conversion

    /* Import globals from main program */ extern int timestamp[]; extern int misc[]; extern float values[]; -* convert(): Convert a LOG_BIN? array of binary data into useful data ** Converts BCD values to integer, raw floating point values into float ** values usable under the Intel x86 (IBM PC) architecture.
  • Page 186: E-3. Example

    2620A/2625A Users Manual /* Globals convert() uses for destination */ int timestamp[6]; int misc[3]; float values[22]; extern int isnan(); extern int isinf(); -* main(): LOG_BIN? query response example program ** Converts a hard-coded LOG_BIN? response string into usable data. main() extern int decode();...
  • Page 187: Rs-232 Cabling

    (Fluke 17XXA series), printer, or modem. All connections can be made using the Fluke RS-series of cables (see Options and Accessories in Chapter 1). RS-232 cables should not exceed 50 feet (15 meters) although longer cables are permitted if the load capacitance measured at a connection point (including signal terminator) does not exceed 2500 picofarads.
  • Page 188: F-1. Summary Of Rs-232 Connections

    2620A/2625A Users Manual For example, connection to a serial-to-parallel converter (when using a printer with a parallel input) may be as a DTE (cable RS42) or DCE (cable RS40). HYDRA (DTE) (DB-9/MALE) HYDRA (DTE) (DB-9/MALE) HYDRA (DTE) (DB-9/MALE) HYDRA (DTE)
  • Page 189: F-2. Hydra (Db-9) To Pc (Db-9) Rs-232 Connection (Generic)

    HYDRA RS-232C DB-9 PINS FEMALE MALE Figure F-2. Hydra (DB-9) to PC (DB-9) RS-232 Connection (Generic) RS43 CABLE (NULL MODEM) DB-9 DCD – DATA CARRIER DETECT Rx – RECEIVE Tx – TRANSMIT DTR – DATA TERMINAL READY GND – GROUND DSR –...
  • Page 190: F-3. Hydra (Db-9) To Pc (Db-25) Rs-232 Connection

    2620A/2625A Users Manual HYDRA RS-232C PINS FEMALE MALE RS40 CABLE (OR EQUAL) DB-9 Tx – TRANSMIT Rx – RECEIVE RTS – REQUEST TO SEND CTS – CLEAR TO SEND DSR – DATA SET READY GND – GROUND DCD – DATA CARRIER DETECT DTR –...
  • Page 191: F-4. Hydra (Db-9) To Modem (Db-25) Rs-232 Connection

    HYDRA RS-232C DB-9 PINS Tx – TRANSMIT FEMALE Rx – RECEIVE MALE RTS – REQUEST TO SEND CTS – CLEAR TO SEND DSR – DATA SET READY GND – GROUND DCD – DATA CARRIER DETECT DTR – DATA TERMINAL READY RI –...
  • Page 192: F-5. Hydra (Db-9) To Printer (Db-25) Rs-232 Connection

    2620A/2625A Users Manual HYDRA RS-232C PINS FEMALE MALE Figure F-5. Hydra (DB-9) to Printer (DB-25) RS-232 Connection RS42 CABLE (OR EQUAL) DB-9 Tx – TRANSMIT Rx – RECEIVE RTS – REQUEST TO SEND CTS – CLEAR TO SEND DSR – DATA SET READY GND –...
  • Page 193: F-6. Rs-232 Db9 And Db-25 Connectors

    SOLDER SIDE MALE CONNECTOR SIDE SOLDER SIDE MALE CONNECTOR SIDE Figure F-6. RS-232 DB9 and DB-25 Connectors DB-9 CONNECTOR DB-25 CONNECTOR Appendices RS-232 Cabling CONNECTOR SIDE FEMALE SOLDER SIDE CONNECTOR SIDE FEMALE SOLDER SIDE oo77f.eps...
  • Page 194 2620A/2625A Users Manual...
  • Page 195 Hydra Configuration Record SET-UP NAME_________________________________________ DATE_________________________ q Slow SCAN RATE: q Fast SCAN INTERVAL:_______ :_______: _______ q Printer OUTPUT: q Memory Mode: q All Data q Alarm Data q Alarm Transition Data q Off q External TRIGGERS: Chan Input Name TEMPERATURE UNITS q °C q°F q RS-232-C COMMUNICATION I/F...
  • Page 196 —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-1 AC signal cross talk into a frequency channel, D-2 AC signal cross talk into an ac voltage channel, D-2 AC signal cross talk into an ohms channel, D-2 AC signal crosstalk into a temperature channel, D-3...
  • Page 197 2620A/2625A Users Manual Front panel trigger control, 5-3 —G— General, 3-22 General information (RS-232 and IEEE-488), 4-13 —H— How the instrument processes input, 4-13 Hysteresis, A-12 —I— IEEE-488 operating limitations, 4-9 If power is interrupted, 3-4 If the configuration is reset, 3-4 Implementation of IEEE standard 488.2-1987, C-1...

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2625a