FLUKE 732B, 734A INST 电路图.pdf

732B/734A DC Reference Standard Instruction Manual PN 869321 March 1992 Rev.3, 11/97 1993, 1994, 1997 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies. RadioFans.CN 收音机爱 好者资料库 LIMITED WARRANTY for an extended short, recovery time is less than 2 hours. To maintain calibration as a traceable standard, the 732B must continue to receive uninterrupted operating voltage from ac line power or from the internal battery. If battery voltage drops too low, the front panel IN CAL indicator goes out and recalibration is required. The internal rechargeable battery (if switched on) protects the standard from line power interruption and provides power for hot shipment (shipment under power). The 732B outputs are unaffected as you change between battery or ac line power. Battery operation with a fully charged battery lasts at least 72 hours. You can extend battery operation by connecting an external 12V battery such as Model 732B-7001 to the rear panel MONITOR/EXT BAT IN connector. Plugging the 732B into ac line power for 24 hours fully recharges the internal battery. Four front panel indicators show operating status. Model 732B-7001 External Battery and Charger has all but the IN CAL indicator. AC PWR lights when the 732B is connected to ac line power. IN CAL goes out to warn you when the 732B may have lost its calibration. This indicator responds to an excessively large drop in battery voltage or a large change in oven temperature. If battery voltage falls below the level needed to keep the 732B working normally, the IN CAL indicator extinguishes, indicating a loss of the state of calibration. Once power is restored and the output has been verified, you can reset the IN CAL indicator. Note An illuminated IN CAL indicator is not sufficient by itself to indicate the 732B satisfies the specifications of section 1-12. See Calibration label on front of the 732B for calibration due date. 732B/734A Instruction Manual 1-4 LOW BAT blinks to warn you to plug the line cord into ac power when only a few hours of battery operation remain. CHARGE lights when the battery is being recharged in constant-current charge mode, and is off when the battery is charged to the 90% level. At 90% of full charge, a float charge completes and maintains full charge. You can monitor the oven temperature by measuring the resistance of the oven temperature thermistor through the rear panel MONITOR/EXT BAT IN connector. Instructions for using this connector are in Section 3. Hardware Options1-2. Table 1-1 summarizes hardware options for the 732B DC Standard. Calibration Options are described further on in this section. Table 1-1. 732B/734A Hardware Options and Accessories Model NumberName 734A-7001Instrument Enclosure 732B-7001External Battery and Charger 732B-7002Transit Case for two 732Bs or 732B-7001s Y734Rack Mount Kit for 734A or 734A-7001 734A-7001 Instrument Enclosure1-3. The Model 734A DC Reference Standard is made up of one 734A-7001 Instrument Enclosure and four 732B DC Standards. The Model 734A-7001 can be purchased separately as needed for your application. The enclosure securely holds up to four 732B DC Standards and/or 732B-7001 External Battery/Chargers (described next). An ac power bus inside the 734A-7001 enclosure powers up to four 732B units with only one ac line cord. Using the enclosure allows you to rack mount 732Bs. (See Y734 Rack Mount Kit.) 723B-7001 External Battery and Charger1-4. The Model 732B-7001 External Battery and Charger is contained in the same enclosure as the 732B. This means it fits into and is powered by the 734A-7001 Instrument Enclosure just like a 732B DC Standard. When the external battery is completely charged and connected to a completely charged 732B, it increases 732B battery operating time from 72 to 130 hours. Just as in the 732B, the charger in the 732B-7001 takes 36 hours to completely charge the battery (with no load on the battery). Refer to Section 3 for information about interconnecting 732Bs and 732B-7001s. Accessory Y734 Rack Mount Kit1-5. To rack mount a 732B, use the 734A-7001 Instrument Enclosure (standard equipment with Model 734A). Use Accessory Y734 Rack Mount Kit to mount the enclosure in a rack. Outside dimensions of the 732B and 734A are shown in the specifications at the end of this section. Instructions for rack mounting the 734A-7001 Instrument Enclosure are packed with the kit. Introduction and Specifications Calibration Options1 1-5 Calibration Options1-6. Unless requested at time of order, the 732B is shipped cold (not under battery power) and will need to be calibrated on receipt. A procedure to calibrate a 732B using a reference 732B as a transfer standard is provided in Section 5. After calibration, the 732B must be kept powered by ac power or battery, even during shipment. Fluke calibration services that are available for the 732B are described next. Note Contact a Fluke Sales or Service Center for price and delivery information about 732B calibration options. Addresses for Fluke Service Centers are provided following the parts lists in Section 6. 732B-000 Special Calibration1-7. If you ordered Option 732B-000, the standard is shipped to you hot with a calibration report that assigns a value to the 10V output. This calibration meets or exceeds the requirements of MIL-STD-45662A. 732B-100 Special Calibration and Drift Characterization1-8. If you ordered Option 732B-100, the standard is shipped to you hot with a calibration report that assigns a value to the 10V output. This calibration meets or exceeds the requirements of MIL-STD-45662A. In addition, a calibration report shows the predicted output on the 1st of each month for the 12 months following shipment. 732B-200 On-Site Calibration1-9. Option 732B-200 is the Fluke Direct Volt Maintenance Program, as has been applied to other Fluke dc standards equipment. This program works as follows: 1. Fluke hot-ships a Fluke-owned transfer standard with all the necessary interconnecting cables and clear instructions. 2. You make a series of comparisons over five days and send your data to Fluke. 3. Fluke sends you a calibration report that assigns a value to your 732B 10V output relative to the Fluke Volt. The Fluke Volt is maintained by means of a Josephson Junction array in the Fluke Primary Standards laboratory. Periodic transfers to NIST also maintain traceability to the U.S. Legal Volt (at greater uncertainty) for those who are required to maintain NIST traceability. Warranty Information1-10. The warranty that applies to your Fluke product appears at the front of this manual. 732B/734A Instruction Manual 1-6 Service and Reshipment Information1-11. Warning Service procedures, including replacing the batteries, are to be done by qualified service personnel only. To avoid electric shock or fire, do not service the 732B unless you are qualified to do so. If your standard ever needs service, you may return it to Fluke for Warranty or after- warranty repair. Addresses for authorized service centers are in Section 6. If you are qualified to troubleshoot electronic equipment, you can refer to Section 5 for theory, troubleshooting, and calibration information. Schematic diagrams are in Section 7. The 732B and 734A are designed to withstand the shock and vibration of air and ground shipment, provided that you protect the equipment with a proper shipping container. When you return a 732B or 734A to Fluke for service or calibration, use the original shipping carton, a replacement carton obtained from Fluke, or the accessory transit case. Transit Case Model 732B-7002 holds two 732B DC Standards or 732B-7001 External Battery/Chargers. Caution Do not charge a 732B or 732B-7001 while it is in the transit case. Doing so can cause overheating and possible equipment damage, and in the case of the 732B, loss of the state of calibration. Specifications1-12. Output Voltages 10V and 1.018V are provided at separate binding post pairs with the following characteristics: Note A potential difference of approximately 0.18 V/m, there could be errors in measurements. Temperature Coefficient (TC) of Output In the temperature range of 15C to 35C, the magnitude of the TC is bounded by the following: - 10V Output: TC 0.04 ppm/C - 1.018V Output: TC 0.1 ppm/C Load Regulation 10V Output Load ChangeMaximum 10V Output Change 0 mA to 12 mA (no load to full load)1 ppm 0 mA to 2 mA0.1 ppm Introduction and Specifications Specifications1 1-9 Line Regulation The outputs will change no more than 0.05 ppm for any 10% line voltage change or for the entire operating range of the battery. Output Protection All outputs can be shorted indefinitely without damage to the instrument. The 10V output can withstand voltages from other sources as follows: 1. For voltages 220V dc, the unit is protected for up to 50 mA continuous current. 2. For voltage 1100V dc, the unit is protected for up to 25 mA continuous current or up to 0.6 joules for short periods of time. Environment Temperature RangeRelative HumidityAltitude Normal Operation15C to 35C15% to 80%0 to 6,000 ft Safe Operation0C to 50C15% to 90%0 to 10,000 ft Storage (With battery removed) -49C to 50CNoncondensing0 to 40,000 ft Compliance to Standards ANSI/ISA-S82 CSA C22.2 #231 IEC348 IEC 1010 UL 1244 Line Power Requirements Line voltage is accepted in the two ranges 90 to 132V and 180 to 264V, at 47 to 63 Hz as shown in the table below. AC line current at 120V ac is 0.13A. 732B Line Voltage SettingLine Voltage AcceptedFrequency Accepted 100V90 to 110V47 to 63 Hz 120V108 to 132V47 to 63 Hz 220V180 to 235V47 to 63 Hz 240V225 to 264V47 to 63 Hz Battery Operation When fully charged, the internal batteries will operate the 732B for a minimum of 72 hours at 23 5C, with 0 to 0.1 mA current drain at the 10V output. Model 732B-7001 contains the same battery and charger as Model 732B. 732B/734A Instruction Manual 1-10 Charging Time The batteries are rechargeable in less than 36 hours with a self-contained automatic battery charger. External DC Input A rear panel input for external 12 to 15V dc allows for powering the 732B indefinitely. The dc source must be rated for 300 mA or more. Isolation The resistance from any of the 732B binding posts to earth (chassis) ground or to ac line power is greater than 10,000 M shunted by less than 1000 pF. Guard and Ground Terminals Chassis ground connections are provided on both the front and rear panels. Access to the internal guard is provided by a front panel binding post. Mechanical Specifications Model 734A*Model 732B*Model 732B-7001 Height17.8 cm (7.0 in)13.4 cm (5.28 in)13.4 cm (5.28 in) Width43.2 cm (17.0 in)9.8 cm (3.85 in)9.8 cm (3.85 in) Depth50.3 cm (19.8 in) including handles40.6 cm (16.0 in)40.6 cm (16.0 in) Weight30.4 kg (67 lb)5.91 kg (13 lb)5.91 kg (13 lb) Refer to Figure 1-1. Introduction and Specifications Specifications1 1-11 734A DC REFERENCE STANDARD 50.3 cm (19.8 in) 17.8 cm (7.0 in) 43.2 cm (17.0 in) 732B DC STANDARD AC PWRIN CALCHARGELOW BAT 10V1.018VCHASSIS GUARD1.018V COM10V COM SERIAL NUMBER 732B DC STANDARD AC PWRIN CALCHARGELOW BAT 10V1.018VCHASSIS GUARD1.018V COM10V COM SERIAL NUMBER 732B DC STANDARD AC PWRIN CALCHARGELOW BAT 10V1.018VCHASSIS GUARD1.018V COM10V COM SERIAL NUMBER 732B DC STANDARD AC PWRIN CALCHARGELOW BAT 10V1.018VCHASSIS GUARD1.018V COM10V COM SERIAL NUMBER DC STANDARD AC PWRIN CALCHARGELOW BAT 10V1.018VCHASSIS GUARD1.018V COM10V COM SERIAL NUMBER 40.6 cm (16.0 in)9.8 cm (3.85 in) 13.4 cm (5.28 in) 732B 734A k1i.eps Figure 1-1. Mechanical Specifications 732B/734A Instruction Manual 1-12 2-1 Chapter 2 Installation TitlePage 2-1.Introduction. 2-3 2-2.Unpacking and Inspection. 2-3 2-3.Selecting Line Voltage and Accessing the Fuse. 2-4 2-4.Connecting to Line Power. 2-5 2-5.Installing a 732B or 732B-7001 in a 734A-7001 Instrument Enclosure 2-5 732B/734A Instruction Manual 2-2 Installation Introduction2 2-3 Introduction2-1. This section provides instructions for the following: Unpacking Installation Selecting line voltage Checking or replacing the fuse Connecting to line power Because this section explains fusing and operating environment requirements, you should read this section before operating the standard. Section 3 contains instructions for operating your standard. Unpacking and Inspection2-2. The 732B and 734A are shipped in a container that is specially designed to prevent damage during shipping. However, you should inspect the standard carefully for damage, and immediately report any damage to the shipper. Instructions for inspection and claims are included in the shipping container. If you need to reship the 732B, refer to Service and Reshipment Information in Section 1. If you ordered your 732B with calibration option 732B-000 or 732B-100, the standard is shipped hot (under battery power) to maintain the state of calibration. Verify that the IN CAL indicator is lit. Immediately refer to the fusing and line voltage instructions in this section, and plug the standard into ac line power. Accompanying the standard should be an ac line power cord appropriate for your country. Line power cords available from Fluke are listed in Table 2-2 and illustrated in Figure 2-1. If you have any questions about the contents of the carton you are unpacking, contact the nearest Fluke Service Center. (A List of Service Centers is located in Appendix A of this manual.) For more information about calibration options, refer to Section 1. If a verification test is required for your acceptance procedures, refer to Section 5 for instructions. Table 2-1. Standard Equipment ItemModel or Part Number AC Line Cord(See Table 2-2 and Figure 2-1) 732B/734A Instruction Manual871723 Table 2-2. AC Line Cords Available for Fluke Instruments TypeVoltage/CurrentFluke North American120V/15ALC-1 North American240V/15ALC-2 Universal Euro220V/16ALC-3 United Kingdom240V/13ALC-4 Switzerland220V/10ALC-5 Australian240V/10ALC-6 South African240V/5ALC-7 732B/734A Instruction Manual 2-4 LC-1LC-2LC-3LC-4 LC-5LC-6LC-7 k2f.eps Figure 2-1. Line Power Cords Available for Fluke Instruments Selecting Line Voltage and Accessing the Fuse2-3. Caution To avoid blowing the ac line fuse, verify the position of the line voltage selection drum before plugging in the line cord. Rotate the drum if necessary to match local line power. Caution To prevent instrument damage, verify that a 1/4A, 250V FAST BLOW fuse is installed. No other rating or type of fuse is acceptable. The ac input module on the rear panel has four line voltage settings: 100V, 120V, 220V, and 240V. Each voltage setting has a voltage tolerance of 10% and accepts line frequencies of 50 or 60 Hz. To sel