Agilent 75000 Series B Agilent E1346A 48-Channel Relay Multiplexer Service Manual Enclosed is the Service Manual for the Agilent E1346A 48-Channel Relay Multiplexer. Insert this manual, along with any other VXIbus manuals that you have, into the binder that came with your Agilent Technologies mainframe.
Certification Agilent Technologies certifies that this product met its published specifications at the time of shipment from the factory. Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology (formerly National Bureau of Standards), to the extent allowed by that organization’s calibration facility, and to the calibration facilities of other International Standards Organization members.
Printing History The Printing History shown below lists all Editions and Updates of this manual and the printing date(s). The first printing of the manual is Edition 1. The Edition number increments by 1 whenever the manual is revised. Updates, which are issued between Editions, contain replacement pages to correct the current Edition of the manual. Updates are numbered sequentially starting with Update 1. When a new Edition is created, it contains all the Update information for the previous Edition.
Agilent 75000 Series B Service Documentation Suggested Sequence to Use Manuals Manual Descriptions Installation and Getting Started Guide. This manual contains step-by-step instructions for all aspects of plug-in module and mainframe installation. Introductory programming information and examples are also included. Mainframe User’s Manual.
What’s in this Manual Manual Overview This manual shows how to service the Agilent E1346A Single Ended Relay Multiplexer. Consult the Agilent E1346A User’s Manual for additional information on installing, configuring, and operating the Agilent E1346A. Consult the appropriate mainframe user’s manual for information on configuring and operating the mainframe. Manual Content Chap Title Content 1 General Information Provides a basic description and lists the test equipment required for service.
Contents Chapter 1 - General Information Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 SafetyConsiderations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3 - Replaceable Parts Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 Replaceable Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 Mechanical Parts Locators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 Chapter 4 - Service Introduction . . . . . . . . . . . . . . . . . . . Equipment Required . . . . . . . . . . . .
1 General Information Introduction This manual contains information required to test, troubleshoot, and repair the Agilent E1346A Single Ended Relay Multiplexer. See the Agilent E1346A User’s Manual for additional information on the Agilent E1346A. Figure 1-1 shows the Agilent E1346A Single Ended Relay Multiplexer. Each multiplexer consists of a component assembly and a terminal block. Figure 1-1.
Safety Considerations This product is a Safety Class I instrument that is provided with a protective earth terminal when installed in the mainframe. Check the mainframe, multiplexer, and all related documentation for safety markings and instructions before operation or service. Refer to the WARNINGS page (page iii) in this manual for a summary of safety information. Safety information for preventive maintenance, testing, and service follows and is also found throughout this manual.
WARNING USING AUTOTRANSFORMERS. If the mainframe is to be energized via an autotransformer (for voltage reduction) make sure the common terminal is connected to neutral (that is, the grounded side of the main’s supply). CAPACITOR VOLTAGES. Capacitors inside the mainframe may remain charged even when the mainframe has been disconnected from its source of supply. USE PROPER FUSES.
Relay Life Loading and Switching Frequency Effects Electromagnetic relays are subject to normal wear-out. Relay life depends on several factors. Two factors are loading and switching frequency. Relay Load. In general, higher power switching reduces relay life. In addition, capacitive/inductive loads and high inrush currents (e.g., when turning on a lamp or motor) reduce relay life. Exceeding the specified maximum inputs can cause catastrophic failure. Switching Frequency.
Replacement Strategy The replacement strategy also depends on the application. If some relays are used more often, or at higher load, than the others, the relays can be individually replaced as needed. If all of the relays see similar loads and switching frequencies, the entire circuit board can be replaced when the end of life approaches. The sensitivity of the application should be weighed against the cost of replacing relays with some useful life remaining.
Multiplexer Description NOTE The Agilent E1346A Single Ended Relay Multiplexer is an "instrument" in a VXIbus mainframe. As such, the multiplexer is assigned an error queue, input and output buffers, and a status register. Instruments are based on the logical addresses of the plug-in modules. See the Agilent 75000 Series B Installation and Getting Started Guide to set the addresses to create an instrument.
Multiplexer Serial Numbers Multiplexers covered by this manual are identified by a serial number prefix listed on the title page. Agilent Technologies uses a two-part serial number in the form XXXXAYYYYY, where XXXX is the serial prefix, A is the country of origin (A=USA), and YYYYY is the serial suffix. The serial number prefix identifies a series of identical instruments. The serial number suffix is assigned sequentially to each instrument. The serial number plate is located on the backplane connector.
Recommended Test Equipment Table 1-1 lists the test equipment recommended for testing, adjusting, and servicing the relay multiplexer. Essential requirements for each piece of test equipment are described in the Requirements column. Table 1-1. Recommended Test Equipment Instrument Requirements Recommended Model Use* Controller, GPIB GPIB compatibility as defined by IEEE Standard 488-1987 and the identical ANSI Standard MC1.1: SH1, AH1, T2, TE0, L2, LE0, SR0, RL0, PP0, DC0, DT0, and C1, 2, 3, 4, 5.
Notify Agilent and carrier. Notify Agilent Return Multiplexer to Agilent Figure 1-2.
Shipping Guidelines Follow the steps in Figure 1-3 to return a relay multiplexer to a Agilent Technologies Sales and Support Office or Service Center.
2 Verification Tests Introduction This chapter describes the verification tests for the Agilent E1346A Single Ended Relay Multiplexer. The three levels of test procedures described in this chapter are used to verify that the Agilent E1346A: • is functional (Functional Verification Test) • meets selected testable specifications (Operation Verification) • meets all testable specifications (Performance Verification) Test Conditions/ Procedures See Table 1-1 for test equipment requirements.
Functional Verification Test Procedure The Functional Verification Test for the Agilent E1346A Single Ended Relay Multiplexer consists of sending the *IDN? command and checking the response. This test can be used to verify that the multiplexer is connected properly and is responding to a basic command. 1. Verify that the multiplexer is properly installed in mainframe 2. Verify that the mainframe has passed its power-on test. 3. Send *IDN? to the multiplexer (see example following) 4.
Performance Verification Tests The procedures in this section are used to test the multiplexer’s electrical performance using the specifications in Appendix A - Specifications of the Agilent E1346A Single Ended Relay Multiplexer User’s Manual as the performance standard. There are two performance verification tests for the relay multiplexers: Test 2-1: Closed-Channel Resistance Test and Test 2-2: DC Isolation Test.
Test 2-1: Closed Channel Resistance Test This test verifies that all relay contacts meet the closed-channel resistance specification for the multiplexer. When making the Closed Channel Resistance Test, the path measured always includes: a tree relay, a channel relay, and one or more protection resistors. This test uses the test fixture (see Figure 2-1). The Closed Channel resistance specification for each relay is 2 Ω.
Table 2-1. Measured Protection Resistor Values Resistor Measured Value (Ω) R38 R39 R40 ________________ ________________ ________________ Chs 00-47 and 90-92 HI Measurements Resistor R41 R42 R43 Measured Value (Ω) ________________ ________________ ________________ 1 . Make Hardware Connections • Turn mainframe power OFF • Connect DMM leads as shown in Figure 2-3 • Turn mainframe power ON Figure 2-3. Ch 00-47 HI Measurement Connections 2.
Ch 90-92 LO Measurements 1 . Make Hardware Connections • Turn mainframe power OFF • Connect DMM leads as shown in Figure 2-4 • Turn mainframe power ON Figure 2-4. Ch 90 LO Measurement Connections 1. Measure Channel 90 LO Resistance • Send *RST to multiplexer • Send CLOS (@nn00) to close chan 90 and 00, where nn = card # • • • • (omit leading zeroes in nn ).
Ch 90-92 GU Measurements 1. Make Hardware Connections • Turn mainframe power OFF • Connect DMM leads as shown in Figure 2-5 • Turn mainframe power ON Figure 2-5. Ch 90 GU Measurement Connections 2. Measure Channel 90 GU Resistance • Send *RST to multiplexer • Send CLOS (@nn00) to close chan 90 and 00, where nn = card # • • • • (omit leading zeroes in nn ).
Ch 93 HI Measurement 1. Make Hardware Connections • Turn mainframe power OFF • Connect DMM leads as shown in Figure 2-6 • Turn mainframe power ON Figure 2-6. Ch 93 HI Measurement Connections 2.
Ch 93 LO Measurement 1. Make Hardware Connections • Turn mainframe power OFF • Connect DMM leads as shown in Figure 2-7 • Turn mainframe power ON Figure 2-7. Ch 93 LO Measurement Connections 2.
Ch 93 GU Measurement 1. Make Hardware Connections • Turn mainframe power OFF • Connect DMM leads as shown in Figure 2-8 • Turn mainframe power ON Figure 2-8. Ch 93 GU Measurement Connections 2.
Example: Closed Channel Resistance Test NOTE This example performs a Closed Channel Resistance Test to measure Channels 00 - 47, Channels 90-92 and Channel 93 HI, LO, and GU relay contact resistances. If the relay contact resistance for a channel is >2.0 Ω the program prints a message indicating which channel has failed the test. Use this list in chapter 4 when troubleshooting a failing relay. Since small measurement variations may occur when measuring the protection resistors, the program returns "0.
0 310 320 330 340 350 360 PRINT " 5. Turn Mainframe power ON " PRINT " 5.
670 PRINT TABXY(1,1),"Channels 90-92 ";Path$(K);" Measurements" 680 PRINT TABXY(1,3),"Connect DMM Sense and Input HI leads to COMMON ";Path$(K) 690 PRINT TABXY(1,4),"Connect DMM Sense and Input LO leads to VOLTAGE SENSE ";Path$(K) 700 DISP " Press Continue when connections are complete " 710 PAUSE 720 CLEAR SCREEN 730 J=100 ! Address Offset 740 FOR I=0 TO 2 750 OUTPUT @Mux;"CLOS (@"&VAL$(J)&")" 760 OUTPUT @Dmm;"TRIG SGL" 770 ENTER @Dmm;Value1(I,K) 780 OUTPUT @Mux;"OPEN (@"&VAL$(J)&")" 790 Result1(I,K)=Value
1040 1050 1060 1070 1080 1090 1100 PAUSE CLEAR SCREEN OUTPUT @Mux;"CLOS (@"&VAL$(J)&")" OUTPUT @Dmm;"TRIG SGL" ENTER @Dmm;Value1(K,3) OUTPUT @Mux;"OPEN (@"&VAL$(J)&")" Result1(K,3)=Value1(K,3)-(R(38+K)+R(43-K)) 1110 IF Result1(K,3)<0 THEN Result1(K,3)=0. 1120 IF Result1(K,3)>2.0 THEN 1130 PRINT "Resistance for Channel";(J-100);" ";Path$(K);"Relay is >2.
1440 1450 1460 1470 1480 1490 1500 NEXT K PRINT PRINT "Channel 93 Contact Resistance" PRINT FOR K=0 TO 2 PRINT "Channel 93 ";Path$(K);" ";Result1(K,3);" Ohms" NEXT K 1510 END Typical Result Channel 00-47 and Channels 90-92 HI Contact Resistance CH 0 & 90 CH 1 & 90 CH 2 & 90 CH 3 & 90 CH 4 & 90 CH 5 & 90 CH 6 & 90 CH 7 & 90 CH 8 & 91 CH 9 & 91 CH 10 & 91 CH 11 & 91 CH 12 & 91 CH 13 & 91 CH 14 & 91 CH 15 & 91 CH 16 & 92 CH 17 & 92 CH 18 & 92 CH 19 & 92 CH 20 & 92 CH 21 & 92 CH 22 & 92 CH 23 & 92 1.6785 .
Test 2-2: DC Isolation Test NOTE This test verifies that sufficient DC isolation exists at various points on the multiplexer. DC Isolation is checked from HI to Chassis, HI to LO, and HI to GU (GUARD). This test uses the test fixture (see Figure 2-1). The DMM used should be capable of measuring at least 1 G. Ω. If the DMM indicates an overload, record the reading as >Rmax, where Rmax is the highest resistance that the DMM can measure.
Figure 2-10. HI to LO Isolation Connections HI to GU Isolation 1. Make hardware connections as shown in Figure 2-11 2. Trigger the DMM with TRIG SGL 3. Record the DMM reading on Table 2-2 (HI to GU) Figure 2-11.
Example: DC Isolation Test This example performs DC Isolation Tests for HI to Chassis, HI to LO, and HI to GU (GUARD). 10! RE-SAVE "DC_ISOL" 20 ASSIGN @Dmm TO 722 30 ASSIGN @Mux TO 70914 40 DISP CHR$(129) 50 DIM Conn$(5)[10] 60 DATA CHASSIS, LO, G , CHASSIS, COMMON LO, COMMON G 70 READ Conn$(*) 80 OUTPUT @Dmm;"OHM 1E9" 90 PRINT "Equipment Connections " 100 PRINT 110 PRINT " 1. Turn Mainframe and Agilent 3458A DMM power OFF" 120 PRINT " 2. Connect GPIB Cable between mainfrmae and DMM" 130 PRINT " 3.
360 370 380 390 400 410 420 Typical Result PAUSE CLEAR SCREEN PRINT TABXY(1,1),"DC Isolation Tests " PRINT TABXY(1,3),"HI to CHASSIS (Ohms)";Value(0) PRINT TABXY(1,4),"HI to LO (Ohms) ";Value(1) PRINT TABXY(1,5),"HI to GUARD (Ohms) ";Value(2) END A typical result for an overload on all three measurements is : DC Isolation Tests HI to CHASSIS (Ohms) 1.E+38 HI to LO (Ohms) 1.E+38 HI to GUARD (Ohms) 1.
Performance Test Record Table 2-2, Performance Test Record, is a form you can copy and use to record performance verification test results for the multiplexers. Table 2-2 shows multiplexer test limits, DMM measurement uncertainty, and test accuracy ratio (TAR) values. Test Limits Test limits are defined for relay closed channel resistance and DC isolation using the specifications in Appendix A - Specifications of the Agilent E1346A Single Ended Relay Multiplexers User’s Manual .
Table 2-2. Performance Test Record (Page 1 of 3) General Information Test Facility: Name ____________________________________ Report No.
Table 2-2. Performance Test Record (Page 2 of 3) Test No/Description Minimum* Value Measured Value (V) Maximum Value ** Meas Uncert Test Acc Ratio (TAR) 2-1.
Table 2-2. Performance Test Record (Page 3 of 3) Test No/Description Minimum* Value Measured Value (V) Maximum Value ** Meas Uncert Test Acc Ratio (TAR) 2-1. Closed Channel Resistance (Values in Ohms) (cont’d) HI Path Resistance Channel 36 & 91 Channel 37 & 91 Channel 38 & 91 Channel 39 & 91 ___________________ ___________________ ___________________ ___________________ ___________________ 2.0 2.0 2.0 2.0 8.00E-5 8.00E-5 8.00E-5 8.
2-24 Verification Tests
3 Replaceable Parts Introduction This chapter contains information to order replaceable parts for Agilent E1346A Single Ended Relay Multiplexers with serial number prefixes 2934A and below. Table 3-1 lists assembly and terminal block part numbers for the multiplexer, Table 3-2 lists replaceable parts for the multiplexer, Table 3-3 shows reference designators for parts in Table 3-2, and Table 3-4 shows the manufacturer code list for these parts.
Table 3-2. Agilent E1346A Replaceable Parts Reference Agilent Part Qty Designator Number Part Description Mfr. Code Mfr. Part Number ASSEMBLIES/CABLES/MANUALS (See Figure 3-1) A1 E1346-66201 1 MOD RLY MUXR 48CH SE 28480 E1346-66201 E1400-61605 1 CABLE RIBBON ASSEMBLY FOR E1400A 28480 E1400-61605 0050-2183 2 CASTING-ZINC P.C.
Table 3-2. E1346A Replaceable Parts (Continued) Reference Agilent Part Qty Designator Number Part Description Mfr. Code Mfr. Part Number A1CR2 8150-4086 1 WIRE 22AWG-WHITE TEFLON 1X22 105C 28480 8150-4086 A1F1 2110-0712 1 FUSE-SUBMINIATURE 4A 125V NTD AX 75915 R251004T1 A1F2 2110-0665 1 FUSE-SUBMINIATURE 1A 125V NTD AX UL CSA 75915 R251001T1 A1J1 1252-1596 2 CONNECTOR-POST TYPE 2.54-PIN-SPCG 96-CONTACT 06776 DIN-96CPC-SRI-TR A1J2 1252-3712 1 CONNECTOR-POST TYPE .
Table 3-2. E1346A Replaceable Parts (Continued) Reference Agilent Part Qty Designator Number Part Description Mfr. Code Mfr.
Table 3-2. E1346A Replaceable Parts (Continued) Reference Agilent Part Qty Designator Number Part Description Mfr. Code Mfr. Part Number TERMINAL MODULE (See Figure 3-2) A3 E1346-66510 1 THERMNL MODULE PC 28480 E1346-66510 A3P1 1252-1593 1 CONNECTOR-POST TYPE 2.54-PIN-SPCG 96-CONTACT 91662 20-8577-096-002-025 A3PCB1 E1346-26510 1 PC BOARD - BLANK 28480 E1346-26510 A3TB1-TB5 0360-2391 5 TERMINAL BLOCK 12 P.
Table 3-4. Agilent E1346A Code List of Manufacturers Mfr.
Mechanical Parts Locators Figures 3-1 and 3-2 show locations of selected mechanical parts for the Agilent E1346A Single Ended Relay Multiplexer. See the Component Locators at the end of Chapter 4 - Service for locations of electrical components. Figure 3-1.
Figure 3-2.
4 Service Introduction This chapter contains service information for the Agilent E1346A multiplexer. Also included are troubleshooting, repair, and maintenance guidelines. Component locators and schematic diagrams for the multiplexer are located at the end of this chapter. WARNING Do not perform any of the service procedures shown unless you are a qualified, service-trained technician and have read the WARNINGS and CAUTIONS in Chapter 1.
Agilent E1346A Multiplexer Description Component Assembly Description The Agilent E1346A 48-Channel Single Ended Relay Multiplexer consists of an E1346A component assembly (E1346-66201) and a terminal block. The multiplexer provides switching (multiplexing) for 48 channels (channels 00 to 47). Each channel switches only a high (HI) connection. The Low (LO) and Guard (G) connections are common for all channels. The Low and Guard are switched, however, by the tree switches.
Figure 4-1.
Troubleshooting Techniques NOTE Identifying the Problem To troubleshoot a relay multiplexer problem you must first identify the problem and then isolate the cause of the problem to a replaceable part. See Chapter 3 - Replaceable Parts for descriptions and locations of Agilent E1346A replaceable parts.
NOTE See the Agilent E1346A Single Ended Relay Multiplexer User’s Manual for information on logical address and IRQ settings. If there are no apparent problems following the visual checks, run the Performance Verification Tests in Chapter 2 to see if a relay or other component is defective. Table 4-2.
Table 4-3.
Repair and Maintenance Guidelines ESD Precautions This section provides guidelines for repairing and maintaining the Agilent E1346A Single Ended Relay Multiplexer including: • ESD precautions • Soldering printed circuit boards • Post-repair safety checks Electrostatic discharge (ESD) may damage static sensitive devices in the multiplexers. This damage can range from slight parameter degradation to catastrophic failure.
Component Locators and Schematic Diagrams Table 4-4 lists Component Locator Diagrams and Schematic Diagrams for the Agilent E1346A relay multiplexer. Table 4-4.
Appendix A Verification Tests - C Programs Functional Verification Test This program is designed to do the Functional Verification Test found in Chapter 2 - Verification Tests. Example: Self Test NOTE The self test for Agilent E1346A Single Ended Relay Multiplexer consists of sending the *IDN? command and checking the response. This test can be used to verify that the multiplexer is connected properly and is responding to a baxic command.
Performance Verification Test This program is designed to do the Performance Verification Test found in Chapter 2 - Verification Tests. NOTE These programs assume a primary address of 09 and a secondary address of 14. If your Multiplexer address does not match this, you must either change the Multiplexers address setting or change the program lines # define ADDR "hpib7,9,14" to match your Multiplexers address setting.
/* ---------------Measure Protection Resistors ---------------* / printf ("\ n\ nMeasure Protection Resistors R38 - R43"); printf ("\ n\ n 1. Turn mainframe power OFF."); printf ("\ n 2. Remove E1346A component assembly from mainframe."); printf ("\ n 3. Press ENTER when ready to measure protection resistors.
if (result[i] < 0) result[i] = 0; if (result[i] > 2.0) printf ("\ n* * * Resistance for Channel %u HI path is 2.0 Ohms * * * %If", i, result[i]); } printf ("\ n\ nMeasurements complete for Channels 00-47 and 90-92 HI"); printf ("\ nPress ENTER for Channels 90-92 LO measurements"); getchar (); /* ..........Measure Channels 90-92 LO..........* / iprintf (id, "* RST\ n"); printf ("\ n\ n\ nChannels 90-92 LO measurements"); printf ("\ n\ n 1. Connect DMM Sense and Input HI leads to COMMON LO."); printf ("\ n 2.
for (i = 0; i < = 2; i+ + ) { iprintf (id, "CLOS (@°/0u)\ n", j); iprintf (dm, "TRIG SGL\ n"); iscanf (dm, "%lf", &value1[i][2]); iscanf (dm, "%t", cr); iprintf (id, "OPEN (@%u)\ n", i* 8); resultl[i][2] = value1[i][2] - R[42]; if (resultl[i][2] < 0) resultl[i][2] = 0; if (resultl[i][2] > 2.0) printf ("\ n* * * Resistance for Channel %u G Relay is 2.0 Ohms", i+ 90); j = j + 8; } printf ("\ n\ nMeasurements complete for Channels 90-92 G."); printf ("\ nPress ENTER for Channel 93 HI, LO, and G measurements.
iscanf (dm, "%t", cr); resultl[1][3] = valuel[1][3] - R[39] - R[42]; iprintf (id, "open (@%u)\ n", j); if (result1[1][3] < 0) result1[1][3] = 0; if (result1[1][3] > 2.0) printf ("\ n* * * Resistance for Channel 93 LO Relay is 2.0 Ohms"); printf ("\ n\ n 1. Connect DMM Sense and Input HI leads to VOLTAGE SENSE G."); printf ("\ n 2. Connect DMM Sense and Input LO leads to CURRENT SOURCE G."); printf ("\ n 3. Press ENTER when connections are complete.
Example: DC Isolation Test This example performs DC Isolation Tests for HI to Chassis, HI to LO, and HI to GU (Guard). /* DC Isolation Test E1346A * / # include < stdio.h> # include < sicl.
/* ..........HI to GUARD..........* / printf ("\ n\ nConnect DMM HI and LO to E1346A COMMON HI and COMMON G"); getchar (); iprintf (dm, "TRIG SGL\ n"); iscanf (dm, "%t", reading); printf ("\ nDC Isolation - HI to GUARD "); printf (" R = %s Ohms", reading); /* .........................................
