Specifications

Specifications are divided into four sections. The first section contains the specifications that apply to both the 2680A and 2686A devices. The second section contains specifications that apply only to the Precision A D Input (PAI) module. The third section contains specifications that apply only to the Fast A D Input (FAI) module. The last section contains information only for the digital I O relay and the totalizer (DIO) module. The following specifications apply to both the 2680A and 2686A...

Do Housekeeping

The Command Packet tells the A D to do the following Do all housekeeping readings if bit set. Do the next housekeeping reading in the schedule if bit set. Prescan preset the function relays. Checksum Action Performed is as follows If the Housekeeping bit is 1, the inguard takes a complete set of housekeeping readings for the current measurement rate (there is one set for each rate). If the Next bit is 1, the inguard does the next housekeeping reading indicated by its internal schedule. This is...

Command

The device RS-232 command set is shown in Table 6-7 RS-232 Command Set. The calibration commands are described in more detail in Chapter 5. These are CAL, CAL_CLR, CAL_CONST, CAL_CONST , CAL_REF, CAL_REF , and CAL_STEP . The other commands are described in this chapter. The device does not accept the calibration commands unless calibration mode is enabled. In calibration mode, the device does not accept some non-calibration commands. It is expected that users will make all calibration...

Reading Rates

The instrument has three reading rates fast, medium, and slow. These measurement rates allow you to obtain higher resolution and accuracy at the expense of slower measurements. The instrument obtains higher resolution measurements by averaging multiple A D readings and or waiting longer for signal conditioning to settle. The number of A D readings averaged together to obtain a single measurement is given below in Table 2-16. Multiple A D readings taken to average to obtain a measurement must be...

Fluke DAQ Master Alarm Output Test

Connect Test Leads to ALARM TRIGGER I O Connector Remove the 8-position ALARM TRIGGER I O connector from the device rear panel. Connect a test lead to each line, Master Alarm, Trigger Output, Trigger Input, plus a test lead to the GND line. 2. Measure Line Using a digital multimeter, measure the output of the Master Alarm test lead, referenced to the GND test lead, to check if the voltage is greater than +3.8 V dc. 3. Verify Configuration Channel 1 for V dc In Fluke DAQ, verify channel 1 is...

General Troubleshooting

General troubleshooting uses the device response to self-test as a clue to the fault location. If the device completes self-test and displays an error code on the front panel, refer to Table 6-9. If the device appears dead and will not even self test, refer to Table 6-10. If the device passes self test but is not operating correctly, then refer to Troubleshooting the A D Converter PCA for analog problems, and Troubleshooting the Sys Ctrl PCA for master alarm, trigger in, and trigger out...

AC Volts Measurement Circuitry

AC-coupled voltage inputs are scaled by an ac buffer (A3U29), converted to dc by a true RMS ac-to-dc converter (A3U26), filtered by an active ac volt filter, then sent to the Stallion IC, the Buffer Amplifier, and the A D Conversion Circuitry (see Table 2-6). The HI input is switched to the ac buffer through dc blocking capacitor A3C80. The LO input is sensed through A3L52, A3R146, A3K27, A3R119, and S33 and S37. The gain or attenuation of the ac buffer is selected by A3U30's ACR1-ACR4 outputs....

RS232 Digital Input Output Test

To output bits use the DIO < mask> ,< value> command. Set the mask to 1048575. Use the command DIO for input. The value can range from 1 to 1048575 (2A20 - 1). 1. Set Signal Lines High Set all of the signal lines high using the DIO 1048575,1048575 command. 2. Verify Signal Verify that all of the signal lines are equal to or greater than +3.5 V dc. 3. Set Signal Line Low Set all of the signal lines low using the DIO 1048575,0 command. 4. Verify Signal Verify that all of the signal lines...

Pcmcia Pca Troubleshooting

The PCMCIA interface board mainly consists of a card holder and a set of bi-directional level shifting buffers. The buffers on this board are driven off the same supply as the card, which can be either 3.3 V or 5 V. The buffers on A4 board are always powered from Vcc (3.3 V). This board also has a 5 V to 12 V boost topology switching regulator that is only turned on if the installed card says that it needs 12 V for programming. This 12 V supply was designed to only provide enough power for the...

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Fluke DAQ Trigger Output Test

Configure Interval Trigger Using the Fluke DAQ software, configure the scan parameters for Interval Trigger with an Interval 1 of 1 second. 2. Verify Configuration Channel 1 for V dc In Fluke DAQ, verify channel 1 is configured for V dc, 3 V range. 3. Measure Unset Trigger Output Line Using a digital multimeter, measure the output of the unset test lead, referenced to the GND test lead, for a voltage greater than +3.8 V dc. 4. Verify Trigger Output is Enabled In Fluke DAQ, select Setup Device...

Options and Accessories

Table 1-40 summarizes the available Models, Options and Accessories. Table 1-40. Models, Options and Accessories Table 1-40. Models, Options and Accessories Digital I O Relay with Totalizer Module Fluke DAQ Software. Included with the purchase of each chassis. Fluke Development Software from InduSoft Fluke DLL Library routines for the development of device drivers Fluke OPC Software. Used to configure a PC to act as an OPC server and provide virtual contact with a 268XA device.

4

*The resistance accuracy in this table makes allowance for up to 0.1 Ohm of lead wire resistance plus 0.01 decade resistance tolerance. You must add any additional lead wire resistance present in your setup to the resistance values given in this table. *The resistance accuracy in this table makes allowance for up to 0.1 W of lead wire resistance. You must add any additional lead wire resistance present in your setup to the resistance values given in this table. Using the 5700A in 2-wire...

Servicing Surface Mount Assemblies

The device incorporates Surface-Mount Technology (SMT) for printed circuit assemblies (PCA's). Surface-mount components are much smaller than their predecessors with leads soldered directly to the surface of a circuit board. No plated through-holes are used. Unique servicing, troubleshooting, and repair techniques are required to support this technology. The information offered in the following paragraphs serves only as an introduction to SMT. It is not recommended that repair be attempted...

AD Power Supply PCA Troubleshooting

To access this card for test, the user may need the 2680A-7001K Extender kit, p.n. 1619174. This module is used to isolate module communication and power signals from the earth referenced SYS CTRL PCA. It is located inside each module's housing, as a daughter card that plugs into a 2 row, 10 pin header on every module. The power supply design uses a differential 393 KHz clock source generated on the SYS CTRL card, U25, and arrives to the PCA on P1 pins 9 and 19. There are 3 regulated outputs...

Fluke DAQ Totalizer Count and Debounce Test

Configure DIO In the Configuration dialog, select the DIO from TreeView. In the DIO Configuration dialog, set the start count to 0, select debounce on, and select direction as up. 2. Start Spy Go to the Spy and start the Spy with the play button. 3. Verify Totalizer Value Verify that the totalizer value has not changed. 4. Set Signal Generator Set the signal generator to 1 kHz and 1 V pp and connect to the totalizer input. 5. Verify Totalizer Count Verify that the totalizer count does not...

Digital Input Output Module

The following specifications apply to the DIO Module. The module contains digital open collector outputs, relay contacts, digital inputs, and totalizer. AA'Warning The DIO module is rated as a CAT I device. Table specifications provides a summary of the Digital I O specifications for the 10 Digital I O lines (0 to 19). Digital I O is located on the Output Module Digital connector, terminals 0 to 19, and GND. Note that the Master Alarm can be designated as any Digital output channel or one of...

Using the RS232 Interface

The device supports calibration adjustment and verification using ASCII commands on the RS-232 interface since MET CAL does not have network capability, and field calibration stations probably won't either. The device also supports several commands for factory testing and several for software testing. The RS-232 interface is also used to download the main software to flash. The user can configure the function, range, and number of terminals for channel one only. RS-232 can be used to get a...

RS232 Master Alarm Output Test

Connect Test Leads to ALARM TRIGGER I O Connector Remove the 8-position ALARM TRIGGER I O connector from the device rear panel. Connect a test lead to each line, Master Alarm, Trigger Output, Trigger Input, plus a test lead to the GND line. 2. Measure Line Using a digital multimeter, measure the output of the Master Alarm test lead, referenced to the GND test lead, to check if the voltage is greater than 3.8 V dc. 3. Set or Clear Master Alarm Bit To set or clear the Master Alarm bit through...

Digital Input Output PCA

The following paragraphs describe the digital input output as follows A Texas Instrument MSP430P337A mixed signal microcontroller is the heart of the DIO PCA. The microcontroller, U4, features bi-directional digital ports, a built in UART and internal timers for controlling operation. A quartz crystal operating at 32.8 kHz provides the main clock signal for the microcontroller. This signal is internally multiplied to 3.6925 MHz for clocking of the microcontroller functions and is also divided...

Ad

The multi-slope A D converter in the instrument uses a hardware state machine A3U18 to control the switching of the voltage references during the A D conversion. This state machine also contains the counters that measure how long each reference is switched in, and provides the A3U5 A D microprocessor with its interface to the A D. A synchronous serial port is used to transfer the counter contents from the state machine to the A3U5 A D microprocessor. These counter values can then be manipulated...

Self Test Diagnostics and Error Codes

If the PC card has a configuration in the scan data that is inconsistent with the current module mix, scanning will not begin. When using a PC card, you must either format the PC card or modify the module mix to match the PC card scan configuration before scanning can begin. Module 1 calibration constants corrupt Module 1 calibration procedures incomplete Module 1 zero offset measurements unreasonable Module 1 reference balance measurements unreasonable Module 1 open thermocouple detection...

VAC Calibration Procedure

The V ac calibration procedure calculates gain and offset calibration constants for all of the V ac ranges. Complete the following procedure to manually calibrate the V ac 1. If you have not already done so, complete the procedure Preparing for Calibration earlier in this chapter. 2. Connect the device and 5700A Calibrator as shown in Figure 5-3. 3. Complete the sequence of manual steps shown in Table 5-5. Measurements are made on channel 1 for each V ac range one at 10 of full scale and one at...

Parts Lists

The following tables list the replaceable parts for the 268XA devices. PCAs may be subject to damage by static discharge. Table 7-1. 2680A Final Assembly Parts List Table 7-1. 2680A Final Assembly Parts List HOLDER,HLDR,FUSE,1 4 X 1-1 4,LOPROFILE,PNLMT 2680A-4004 PCA, SYSTEM POWER AND CONTROLLER 5500A-4417,WIRE, BINDING POST TO FASTON LC1 LINE CORD,NORTH AM,10A,5-15 IEC,18 3,SVT,7.5 FT MNO2,3.0V,0.560AH,CR2450,COIN,PC PINS,24X5MM,BULK CABLE ASSEMBLY,FLAT,20 COND,MICRO MODUL RECEPT,FERRITE,12...

Inguard Microcontroller

This microprocessor A3U5 and associated circuitry controls all functions on the A D Converter PCA and communicates with the Controller System Power PCA. Upon request by the Controller System Power PCA also called the out guard processor , the inguard microprocessor selects the input channel to be measured through the channel selection circuitry, sets up the input signal conditioning, commands the A D EPLD A3U18 to begin a conversion, stops the measurement, and then fetches the measurement...

Open Thermocouple Detect Circuitry

The open thermocouple detect circuitry uses devices A3U23 and A3U32. Before every thermocouple measurement, the open T C check is done by sending a small ac-coupled signal to the thermocouple input. The A D Microcomputer A3U5 initiates the open T C test by asserting OTC_EN and turning ON A3Q20. A 19.2 kHz square wave is sent out the OTCCLK line through A3Q20 and A3C82 to the thermocouple. The resulting waveform is detected by A3U32 pin 3 and a proportional level is stored on A3C79. If the level...

Info

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DC Fuse Replacement

The 2680A 2686A devices use a 4 ampere, 250 V, slow blow fuse in series with the dc supply input. This fuse is mounted on the main controller board inside the chassis. See Figure 3-2 for an illustration of the dc fuse location. Because of potential high voltages, this fuse should only be replaced by a Fluke qualified technician. AA'Warning The 268XA chassis contains high voltages that can be dangerous or fatal. Only qualified personnel should attempt to service the chassis. 1. Disconnect all...

Table of Contents

1 Introduction and Block 2680A 2686A Combined 2680A 2686A General Real-Time Clock and Trigger In Trigger Out Master Alarm Output Communication 2686A PC Card Precision Analog Input PAI A D Specifications PAI A D DC Voltage PAI A D AC Voltage Measurement PAI A D 4-Wire Resistance Measurement PAI A D 2-Wire Resistance Measurement PAI A D 4-Wire RTD per ITS-1990 Measurement PAI A D 2-Wire RTD per ITS-1990 Measurement PAI A D Thermocouple per ITS-1990 Measurement PAI A D Frequency Measurement Fast...