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Service and Maintenance

2

 

Fuse Replacement

U1270 Series Service Guide

57

Fuse Replacement

The current input terminals of your multimeter are fuse 
protected. The fuses are located next to the battery 
compartment. 

•

The 

µA mA

 terminal is protected by a 10 

×

 35 mm 

 

440 mA/1000 V 30 kA fast- acting fuse (Fuse 1).

•

The 

A

 terminal is protected by a 10 

×

 38 mm 

 

11 A/1000 V 30 kA fast- acting fuse (Fuse 2).

If you are certain that the fuse is faulty, replace it with one 
of the same size and rating.

1

Open the battery cover.

 Lift the tilt stand and loosen 

screws with a suitable Phillips screwdriver and remove 
the battery cover.

2

Locate the faulty fuse.

 Fuse 1 (see 

Figure 2- 3

) is located 

to the right of batteries, and Fuse 2 (see 

Figure 2- 4

) is 

located at the bottom of the batteries. See 

Figure 2- 5

 for 

the specific location, size, and ratings of Fuse 1 and 2.

Gently remove the defective fuse by prying one end of the 
fuse with a flathead screwdriver and removing it out of 
the fuse bracket. Replace a new fuse of the same size and 
rating into the center of the fuse holder.

3

Close the batter cover.

 Place the battery cover back in its 

original position and tighten the screws.

N O T E

No recalibration is required after replacing the fuse.

C A U T I O N

Before you proceed with the fuse replacement, remove all cable 
connections to the terminals and ensure that the rotary switch is at the 
OFF position.

Содержание U1270 Series

Страница 1: ...Agilent Technologies Agilent U1270 Series Handheld Digital Multimeters Service Guide...

Страница 2: ...that conflict with these terms the warranty terms in the separate agreement shall control Technology Licenses The hardware and or software described in this document are furnished under a license and...

Страница 3: ...t current DC Caution risk of electric shock Alternating current AC Caution risk of danger refer to this manual for specific Warning or Caution information Both direct and alternating current Category...

Страница 4: ...ttery type The power for the meter is supplied with four AAA 1 5 V batteries Observe the correct polarity markings before you insert the batteries to ensure proper insertion of the batteries in the me...

Страница 5: ...surement Voltages measured are usually greater than what are indicated on the multimeter as the voltages with higher frequencies have been filtered through the LPF function Do not use the ZLOW low inp...

Страница 6: ...batteries Storage condition 40 C to 70 C Humidity Operating condition Maximum 80 RH at 40 C non condensing Minimum 50 RH at 40 C non condensing Storage condition Up to 95 RH at 40 C non condensing Al...

Страница 7: ...CES NMB 001 indicates that this ISM device complies with the Canadian ICES 001 Cet appareil ISM est confomre a la norme NMB 001 du Canada This instrument complies with the WEEE Directive 2002 96 EC ma...

Страница 8: ...ctrical or electronic product in domestic household waste Product Category With reference to the equipment types in the WEEE directive Annex 1 this instrument is classified as a Monitoring and Control...

Страница 9: ...this instrument is available on the Agilent Web site You can search the DoC by its product model or description at the Web address below http regulations corporate agilent com DoC search htm NOTE If...

Страница 10: ...X U1270 Series Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK...

Страница 11: ...al input test 23 Calibration Process 25 Test Considerations 26 Performance Verification Tests 27 Calibration Security 37 Unsecuring the Instrument for Calibration 38 To unsecure the instrument from th...

Страница 12: ...nce Troubleshooting 52 Checking the Fuse 53 Fuse Replacement 57 Returning the Instrument for Service 61 Replaceable Parts 62 To order replaceable parts 62 Types of Service Available 63 Extended servic...

Страница 13: ...4 Input warning display A mA terminal 24 Figure 1 5 Unsecuring the instrument 38 Figure 1 6 Changing the calibration security code 39 Figure 1 7 Resetting the calibration security code 40 Figure 1 8...

Страница 14: ...XIV U1270 Series Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK...

Страница 15: ...f Tables Table 1 1 Recommended test equipment 20 Table 1 2 Performance verification tests 28 Table 1 3 Adjustment input values 43 Table 1 4 Calibration error codes 50 Table 2 1 Operating checklist 52...

Страница 16: ...XVI U1270 Series Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK...

Страница 17: ...ss 25 Test Considerations 26 Performance Verification Tests 27 Calibration Security 37 Unsecuring the Instrument for Calibration 38 To unsecure the instrument from the front panel 38 To change the cal...

Страница 18: ...calibration The instrument features closed case electronic calibration In other words no internal mechanical adjustments are required The instrument calculates correction factors based upon the input...

Страница 19: ...tions are only guaranteed within the period stated from the last adjustment Agilent recommends that re adjustment should be performed during the calibration process for best performance This will ensu...

Страница 20: ...e target calibration value Table 1 1 Recommended test equipment Application Recommended equipment Recommended accuracy requirements DC voltage Fluke 5520A 20 of the U1270 Series accuracy specification...

Страница 21: ...erature Fluke 5520A 20 of the U1270 Series accuracy specification Short Shorting plug a dual banana plug with a copper wire shorting the two terminals Zlow Agilent U1252B Table 1 1 Recommended test eq...

Страница 22: ...test Backlight test U1271A U1272A only Press and hold the key while turning the rotary switch to any other position OFF to ON Check that the multimeter s backlight is turned on Press any key to exit t...

Страница 23: ...this mode Figure 1 2 U1271A U1272A LCD screen Current terminal input test This test determines if the input warnings of the current terminals are functioning properly Input warning test A terminal The...

Страница 24: ...the A mA terminal but the rotary switch is not set to the or function The multimeter displays an input warning error Figure 1 4 Figure 1 4 Input warning display A mA terminal The alert beep tone will...

Страница 25: ...ecure the instrument for calibration see Calibration Security on page 37 4 Prior to performing the adjustments see the Adjustment considerations on page 42 5 Perform the adjustment procedure see Adjus...

Страница 26: ...be put under the laboratory environment for at least 1 hour Ensure that the calibration ambient temperature is stable and is between 18 C and 28 C Ideally the calibration should be performed at 23 C...

Страница 27: ...ide available for download at www agilent com find hhTechLib The performance verification tests are recommended as acceptance tests when you first receive the instrument The acceptance test results sh...

Страница 28: ...000 V 1000 V 20 V 1000 V 70 Hz 250 V ZLOW Turn the rotary switch to the position 1000 V 3 V 2 0 V NOTE First connect the COM and terminals of the U1252B or equivalent to the COM and V terminals of the...

Страница 29: ...5 V 30 V 45 Hz 0 230 V 0 200 V 30 V 65 Hz 0 230 V 0 200 V 30 V 1 kHz 0 325 V 0 325 V 30 V 5 kHz 00625 V 0 475 V 30 V 20 kHz 0 640 V 0 640 V 27 V 100 kHz 0 985 V 300 V 300 V 45 Hz 2 30 V 2 00 V 300 V 6...

Страница 30: ...n press the key twice 99 99 50 100 Hz 3 Vpp square wave 0 3 0 3 5 ACmV Turn the rotary switch to the position 30 mV 30 mV 20 Hz 0 235 mV 30 mV 45 Hz 0 200 mV 30 mV 65 Hz 0 200 mV 30 mV 1 kHz 0 235 mV...

Страница 31: ...60 V 3 V 45 Hz 0 0235 V 3 V 65 Hz 0 0235 V 3 V 1 kHz 0 0360 V 3 V 5 kHz 0 0510 V 3 V 20 kHz 0 0675 V 2 7 V 100 kHz 0 1017 V 30 V 30 V 20 Hz 0 360 V 30 V 45 Hz 0 235 V 30 V 65 Hz 0 235 V 30 V 1 kHz 0 3...

Страница 32: ...20 mV 0 20 mV 2 The accuracy is specified after the Null function is used to subtract the thermal effect by shorting the test leads before measuring the signal 9 AC DCmV Turn the rotary switch to the...

Страница 33: ...M 0 0185 M 0 0185 M 30 M 4 30 M 0 365 M 0 365 M 100 M 4 100 M 2 10 M 300 M 4 120 M 9 70 M 3 The accuracy of the 30 to 3 k range is specified after the Null function is used to subtract the test lead...

Страница 34: ...ent for at least 1 hour before you proceed to ensure that the multimeter s internal reference junction sensor and input terminal are stabilized at the same environment Keep the multimeter away from an...

Страница 35: ...mA While the rotary switch is in the position press the key once 30 mA 30 mA 20 Hz 0 295 mA 30 mA 45 Hz 0 295 mA 0 205 mA 30 mA 65 Hz 0 295 mA 0 205 mA 30 mA 1 kHz 0 295 mA 0 295 mA 300 mA 300 mA 20 H...

Страница 36: ...he key once 3 A 3 A 45 Hz 0 0325 A 0 0265 A 3 A 65 Hz 0 0325 A 0 0265 A 3 A 1 kHz 0 0325 A 0 0325 A 10 A 10 A 45 Hz 0 125 A 0 105 A 10 A 65 Hz 0 125 A 0 105 A 10 A 1 kHz 0 125 A 0 125 A Table 1 2 Perf...

Страница 37: ...ust unsecure it by entering the correct security code see Unsecuring the Instrument for Calibration on page 38 The security code is set to 1234 when the instrument is shipped from the factory The secu...

Страница 38: ...the and keys simultaneously for more than 1 second The calibration security code entry is shown on the display Figure 1 5 Unsecuring the instrument 2 Key in the default security code if you are unsecu...

Страница 39: ...ss for more than 1 second 2 The factory default calibration security code 1234 is shown on the display if you are changing the calibration security code for the first time Figure 1 6 Changing the cali...

Страница 40: ...ess the and keys simultaneously for more than 1 second The calibration security code entry is shown on the display 3 Press for U1273A U1273AX or for U1271A U1272A for more than 1 second Figure 1 7 Res...

Страница 41: ...e calibration security code is now set to its factory default code 1234 If the incorrect security code is entered an error code will appear briefly after which the instrument will prompt you for the s...

Страница 42: ...indicator appears replace the batteries as soon as possible to avoid false readings 3 Consider the thermal effects as you are connecting the test leads to the calibrator and multimeter It is recommend...

Страница 43: ...1 1 Reference value 300 mV 300 00 mV 0 9 to 1 1 Reference value ACmV 30 mV 3 000 mV 70 Hz 0 9 to 1 1 Reference value 30 000 mV 70 Hz 0 9 to 1 1 Reference value 30 000 mV 30 kHz 0 9 to 1 1 Reference v...

Страница 44: ...9 to 1 1 Reference value 300 0 V 70 Hz 0 9 to 1 1 Reference value 300 0 V 3 kHz 0 9 to 1 1 Reference value DC A OPEN OPEN OPEN terminals 300 A 300 00 A 0 9 to 1 1 Reference value 3000 A 3000 0 A 0 9 t...

Страница 45: ...ce value Capacitance OPEN OPEN With cables connected to CAP COM terminals 10 nF 04 000 nF 0 9 to 1 1 Reference value 10 000 nF 0 9 to 1 1 Reference value 100 nF 010 00 nF 0 9 to 1 1 Reference value 10...

Страница 46: ...t compensation required Note Ensure the multimeter is turned on and stabilized for at least 60 minutes with the K type thermocouple connected between the multimeter and the calibrator output terminal...

Страница 47: ...e calibration item will be shown on the display Figure 1 8 Reference value display 4 Configure each calibration item 5 Use the arrow keys to select the calibration range 6 Apply the input signal shown...

Страница 48: ...t function column shown in Table 1 3 Repeat step 3 to step 8 for each adjustment point shown in the adjustment table 11 Verify the adjustments using the Performance Verification Tests on page 27 Exiti...

Страница 49: ...reset to 0 The calibration count can be read from the front panel after the instrument has been unsecured 1 In adjustment mode press to view the calibration count 2 Take note of the calibration count...

Страница 50: ...ration Table 1 4 Calibration error codes Code Descriptions Er002 Calibration error secure code invalid Er003 Calibration error serial number code invalid Er004 Calibration error calibration aborted Er...

Страница 51: ...Replacement 57 Returning the Instrument for Service 61 Replaceable Parts 62 To order replaceable parts 62 Types of Service Available 63 Extended service contracts 63 Obtaining Repair Service Worldwid...

Страница 52: ...ich is not covered in this manual should only be performed by qualified personnel Table 2 1 Operating checklist Malfunction Identification No display when powered ON using the rotary switch Verify the...

Страница 53: ...terminal Ensure that the probe tip touches the metal inside the A mA input terminal as shown in Figure 2 1 3 To test Fuse 2 place and touch the tip of the test probe on the left half of the A input t...

Страница 54: ...the Fuse 54 U1270 Series Service Guide Table 2 2 Fuse displayed readings Current input terminal Fuse Part number Fuse rating Displayed readings Fuse healthy Replace fuse 1 2110 1400 440 mA 1000 V 102...

Страница 55: ...Service and Maintenance 2 Checking the Fuse U1270 Series Service Guide 55 Figure 2 1 Testing Fuse 1 Smart Smart...

Страница 56: ...2 Service and Maintenance Checking the Fuse 56 U1270 Series Service Guide Figure 2 2 Testing Fuse 2 Smart Smart...

Страница 57: ...emove the battery cover 2 Locate the faulty fuse Fuse 1 see Figure 2 3 is located to the right of batteries and Fuse 2 see Figure 2 4 is located at the bottom of the batteries See Figure 2 5 for the s...

Страница 58: ...2 Service and Maintenance Fuse Replacement 58 U1270 Series Service Guide Figure 2 3 Replacing Fuse 1 1 2 3...

Страница 59: ...Service and Maintenance 2 Fuse Replacement U1270 Series Service Guide 59 Figure 2 4 Replacing Fuse 2 1 2 3...

Страница 60: ...ervice and Maintenance Fuse Replacement 60 U1270 Series Service Guide Figure 2 5 Positions of Fuse 1 and Fuse 2 Fuse 1 10 35 mm 440 mA 1000 V fast acting fuse Fuse 2 10 38 mm 11 A 1000 V fast acting f...

Страница 61: ...f owner Instrument model number Instrument serial number Description of the service required or failure indications 2 Remove all accessories from the instrument Do not include accessories unless they...

Страница 62: ...s include a brief description of each part with its corresponding Agilent part number To order replaceable parts You can order replaceable parts from Agilent using the Agilent part number Note that no...

Страница 63: ...f your warranty After your warranty expires Agilent offers repair services at competitive prices Extended service contracts Many Agilent products are available with optional service contracts that ext...

Страница 64: ...pplicable To obtain warranty service or technical support information you can contact Agilent at one of the following telephone numbers In the United States 800 829 4444 In Europe 31 20 547 2111 In Ja...

Страница 65: ...6 4866 China tel 800 810 0189 fax 800 820 2816 Europe tel 31 20 547 2111 Japan tel 81 426 56 7832 fax 81 426 56 7840 Korea tel 080 769 0800 fax 080 769 0900 Latin America tel 305 269 7500 Taiwan tel 0...

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