Keithley 169 Instruction Manual Download Page 7 | Manualshive

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Keithley 169 Instruction Manual Download Page 7

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Summary of Contents for 169

Page 1: ...c i a n sw i t ho v e r 1 5 0y e a r so f s p e c i a l i z a t i o n 9 0d a yw a r r a n t y 5d a yr i g h t o f r e t u r no na l l e q u i p me n t 1 3y e a r w a r r a n t i e sf o r n e wa n d p...

Page 2: ...Instruction Manual Model 169 Digital Multimeter 01979 Keithley Instruments Inc Cleveland Ohio U S A Document Number 30161...

Page 3: ...3 3 RECOMMENDED TEST EQUIPMENT 3 1 3 5 ENVIRONMENTAL CONDITIONS 3 l 3 7 PERFORMANCE VERIFICATION PROCEDURE 3 1 3 9 Initial Conditions 3 2 3 11 DC Volts Checkout 3 2 3 12 AC Volts Checkout 3 2 3 13 Re...

Page 4: ...ERY REPLACEMENT 6 9 6 35 CURRENT FUSE REPLACEMENT 6 9 7 REPLACEABLE PARTS 7 D 7 I GENERAL 7 o 7 3 ORDERING INFORMATION 7 D J 5 FACTORY SERVICE 7 O 7 J SCHEMATIC 7 O 7 9 COMPONENTS LAYOUT 7 D J 11 MODE...

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Page 6: ...count 3 l 2 digit liquid crystal dis play LCD with large 0 6 numerals function and range annunicators and a low battery indi cator BAT Appropriate decimal point and minus sign are also displayed posi...

Page 7: ...rranty is given on the inside front cover of this Instruction Manual If there is a need to exercise the warranty contact the Keithley Representative in your area to determine the proper action to be t...

Page 8: ...MODEL 169 GENERAL INFORMATION TABLE 1 1 Specifications Mode 1169 MAXIM M ALLOWABLE INPUT 10 ims 400 prak Hr cO ti o S except 2 m range 35 m i uuLkr 15 sec rndXirnUnlabove 35 1 3...

Page 9: ...FIGURE 2 1 Installation of Batteries NEGATIVE DISPLAYED POSITIVE IWLIED WHEN LW MINUS l 1 CFF BATTERY MILLI 10 3 MICRO I 10 6 AC DIPLAYEO I DC IWLIE I 3 l 2 DIGITS WITH DECIMAL POINT FIGURE 2 2 Model...

Page 10: ...er to prevent their separation and turn the DMM cover to normal position Lift off the top cover NOTE Carbon zinc batteries are supplied These batteries will operate your DMM for ap proximately 1000 ho...

Page 11: ...Operating temperatures these conditions should be avoided for maximum display life Z 10 Front Panel Switches Z 11 Control of the Model 169 is provided by eleven pushbutton switches which are color co...

Page 12: ...unt on 2kn range Checks current fuse 5 A and n 200n and Open 1 00 0 An 2mA Display reads 2mA current shunt on 200n range approx loon 6 A and n 2DOn and Open 1 0 0 uAfl Display reads 20mA current shunt...

Page 13: ...k the DMM accuracy specifications perform the Performance Verification Section 3 The Initial Functional Check is begun with power on and all other push buttons wt To obtain this condition it may be ne...

Page 14: ...l lowed by three blanked digits except on the IOOOV range On the 1OOOV range the instrument can read beyond the maximum allowable input voltage Maximum allowable input voltage 1ooov Pm 1400V peak 106V...

Page 15: ...appear b Connect the circuit to be measured to INPUT HI and LO and select the desired range from the six ranges available The decimal point is positioned by the range pushbutton and the applicable ran...

Page 16: ...are still under war ranty less than 12 months since date of shipment contact your Keithley repre sentative or the factory immediately if the instrument falls outside of specifica tions as determined...

Page 17: ...cified in Table 3 2 d Select each remaining range and apply the required voltage as specified in Table 3 2 verify that the reading is within specifications e Repeat all checks with negative voltage Ra...

Page 18: ...Current Checkout a Select dc current readings with the AC DC and A pushbuttons b Connect the dc current source Item E Table 3 1 to the DMM C Select the 200uA range and apply a current of lOO OOpA to...

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Page 20: ...4 5 MODEL 1651 50 AMPERE SHUNT 4 6 The Model 1651 50 Ampere Shunt shown in Figure 4 2 permits current measurements of up to 50 amperes ac or dc The shunt has a resistance of 0 001 ohm l so that a 50...

Page 21: ...urrent Probe shown in Figure 4 2 permits measurement of ac current by clamping around a single conductor eliminating the need to interrupt the current path Plug the ac current probe into the OMM and s...

Page 22: ...iiUIIT MODEL 1685 CLAMP ON AC CURRENT PROBE FIGURE 4 2 Current Probe and Current Shunt MODEL 1681 CLIP Ok TCST LEAD SET MODEL 1691 GE ER L PURPOSE TEST LEAD SET MODEL 1683 UNIVERSAL TEST LEAD KIT FIGU...

Page 23: ...I ACCESSORIES MODEL 169 I MODEL 1010 o i SINGLE RACK I lOIINTIllT KIT DUAL RACK ElOUNTIN KIT MODEL 1684 CARRYING CASE FIGURE 4 4 Carrying Case and Rack Mounting Kits I 4 4...

Page 24: ...r and their ratio is displayed per the formula IO00 VR i VRREFERENCE 5 6 SIGNAL CONDITIONING 5 l AC DC Voltage Measure wnts 5 8 For voltage measurements ds shown in Figure 5 2 the input is divided by...

Page 25: ...ozero period is set to a minimum of 100 milliseconds During this period the reference voltage input to the A D is stored on capacitor Cl11 and the A D converter is referenced to analog cornnon A corre...

Page 26: ...ECTION 5 23 Effective input protection circuitry has been designed into the Model 169 which provides protec tion against accidental input overloads on all functions and ranges This circuitry is descri...

Page 27: ...nciator Truth Table NN JNCIATOR BAT AC DPl DPZ DP3 V a k SWITCH Q102 DC AC R 2K 20K or 20M 200 or ZOOK V a 200 and 20M R 20M A A and 200 1 A 200 2 V and 200 CONDITIOh OFF AC OFF ON ON ON ON ON OFF ON...

Page 28: ...SECML T DATA TO CKTS DISPLAY AND ANNUNCIATOR t NOTES 1 Output voltage from current shunts and voltage attenuator are zen to 200mVAC and zero to t200mVdc 2 Output of AC Converter is zero to 2OOmVdc FI...

Page 29: ...THEORY OF OPERATION MODEL 169 DECADE RESISTIVE DIVIDER 9M 900K 90K LO 0v to t200mV FIGURE 5 2 Simplified AC LX Voltage Measurement I 5 6...

Page 30: ...MODEL 169 CURRENT SHUllTS HI zooun 900 2oA 90 2omA INPUI 0 9 200mR 9 2oooaiA 0 RANGE l S IITCHING LO FIGURE 5 3 Simplified AC DC Current Meaurement...

Page 31: ...RY OF OPERATION MODEL 169 REFERENCE SOURCE I 100 1 9K 90K RANGE SWITCHING 200 2K RTlOl 0 2K C c 20K 200K 900K 2000K 9M 20M HI 1n A REFERENCE RESISTORS RX FIGURE 5 4 Simplified Resistance Measurement I...

Page 32: ...s WARNING Disconnect all te t circuits from the INPUT connec tions of the Model 169 before removing the case CO H a Turn off power and disconnect ail leads from the 169 DMM Input b Loosen the four scr...

Page 33: ...ircuit Isolation of the specific defective component has been left to the technician Remove the case cover ds explained in Paragraph 6 9 to gain access to circuit components and test locations point 6...

Page 34: ...battery needs replacing refer to Paragraph 6 33 Battery Replacement 6 20 A O Converter and Oisplay Driver 6 21 Proper Operation of the A D Converter and Display Driver circuit should be verified befo...

Page 35: ...5 c R115 9n 0 5 d R116 90n 0 1 e R117 9OOfl 0 1 MODEL 169 6 30 Check the current protection diodes CR107 and CR108 as follows a Select ZOO AOC range b Apply 5VAC through a IKn current limiting resist...

Page 36: ...TIONS REMARKS 1 power ON ZOO DC uan9e 2 Display Short input 00 0 tld rero Check 3 Refewnce UlO2 pin 5 Nominally 98mV using IHigh ImpeddnCP voltmeter with 1OMn reference Input Impedance 4 Ratio Test Sh...

Page 37: ...igital Supply 3 102 pin 3 to Input Lo 4OkHz 6kHz Clack Check Apprax S ip p 4 U102 pin 20 to Input Lo Approx 50Hz Square wave approx svp p 5 UlO2 any display Approx 50H 7 Square In phase with driver li...

Page 38: ...pin 4 7V min External oltagc Source Apply 1OOmVAC at 100Hz Cl08 98mVOC Nominal using 1OMfl input impedance voltmeter Ulol pin 6 to Input Lo See Waveform Figure 6 4 Supply Voltage Calibrated Input IHi...

Page 39: ...DITIONS REMARKS 1 Power OFF DCV func tion all range buttons out 2 RTlOl l OKn to 3 OKn can Resistance Check now be checked in circuit 3 Reference Resistors R108 thru R113 can R108 affects 2005 range b...

Page 40: ...e low battery indicator will automatically come on with approximately 5 of battery life remaining 20 hours for carbon zinc and 40 hours for alkaline cells Replace per directions in Para graph 2 6 6 35...

Page 41: ...y for service please complete the Service Form which follows this section and return it with the instrument 7 7 SCHEMATIC 7 8 The Model 169 3 112 Digit DMM Schematic No 30180D 7 9 COMPONENT LAYOUT 7 1...

Page 42: ...Polyester Cap 4 7uF 25V Aluminum Electrolytic Cap luF lOOV Metalized Polyester Cap 4 7uF 25V Aluminum Electrolytic Cap 1 OuF 16V Aluminum Electrolytic Cap 02uF IOOOV Ceramic Disc Cap 3 3pF 15OOV Cera...

Page 43: ...900k ohm i lW MtF Resistor 9M ohm 08X 2W CMtF Resistor Dual Resistor 9 ohm 5 l ZW MtF Resistor 90 ohm l 1 8W MtF Resistor SOOohm I lW MtF Thermistor 2k ohm 40 8mA 5OOV PTC Switch 12 Station Pushbutto...

Page 44: ...I REPLACEABLE PARTS MODEL 169 FIGURE 7 1 Covers and Panels 7 3...

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Page 48: ...y or output circle one q Drifts q Unahle to xl o OLInstable q WiU not read applied input q 0verlond lJCalihration only q Dara required UC of C required autach any addilional sheets as necessary Show a...

Page 49: ...iately Page7 O ReplaceTable 7 1 with the following Table 7 1 Model 1699 Parts List entity Keithley PIN Schematlc Designation 1 5 5 1 1 2 1 1 i 2 1 1 1 DZ 62 FU 13 FU 46 K 102 10 226 IC 227 IC 226 LSI...

Page 50: ...RF 34 RF 39 RT 5 TG 47 DD 18C c179 4 7 BA 28 30169 30170 Diode Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Resistor Rectifier Rectifier Rectifier The...

Page 51: ...y Page7 O ReplaceTable 7 1 with the following Table 7 1 Model 1699 Paris List Quantity i 5 1 1 r 2 1 1 1 3 2 1 1 1 Keithley P N Schematic Designation K 228 DZ 62 LSI 122 FU 13 R277 9M RF 28 FU 48 RF 3...

Page 52: ...ely Page7 O ReplaceTable 7 l with the following Table 7 1 Model 1699 Parts List Zwantity 1 5 5 1 1 2 1 1 1 3 2 1 1 1 I Keithley PIN Schematic Designation DZ 62 VRlOl FU 13 FlOl 3AG FU 46 Fl 01 5mm x 2...

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