Valhalla 4100 SERIES Operation Manual Download Page 1

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Valhalla Scientific, Inc.

4100 SERIES

DIGITAL OHMMETER

OPERATION MANUAL

8318 Miramar Mall
San Diego, CA 92121
P: 858/457-5576
F: 858/457-0127
W:

www.valhallascientific.com

Advanced Test Equipment Rentals

www.atecorp.com 800-404-ATEC (2832)

Established 1981

Summary of Contents for 4100 SERIES

Page 1: ...4100 SERIES DIGITAL OHMMETER OPERATION MANUAL 8318 Miramar Mall San Diego CA 92121 P 858 457 5576 F 858 457 0127 W www valhallascientific com Advanced Test Equipment Rentals www atecorp com 800 404 AT...

Page 2: ...nty period for this instrument is stated on your invoice and packing list Please refer to these to determine appropriate warranty dates We will repair the instrument during the warranty period provide...

Page 3: ...vember 1995 Safety Symbols Instruction manual symbol affixed to product Indicates that the user must refer to the user manual for specific WARNING or CAUTION information to avoid personal injury or da...

Page 4: ...T perform procedures involving cover or shield removal unless you are qualified to do so DO NOT operate damaged equipment Whenever it is possible that the safety protection features built into this pr...

Page 5: ...olarity Reverse Switch 20 Print Send Switch 20 Resistance Window 20 Chapter 6 Rear Panel Connectors 21 General 21 Power Connector 21 Fuseholder 21 BCD Interface 21 Other Interfaces 21 Chapter 7 Manual...

Page 6: ...51 4100 4150 Display Bd Assembly 52 4165 Clamp PCB Assembly 53 4165 1344 Main Board Assembly 54 4165 1344 Clamp PCB Assembly 58 Option BCD Interface Assembly 59 Chapter 14 Schematics Drawings 60 4100...

Page 7: ...lhalla 4100 Series Chapter 4 Optional Equipment Chapter 4 contains information on all available options and test leads for the Valhalla 4100 Series Chapter 5 Front Panel Controls Chapter 5 describes t...

Page 8: ...rfacing options Chapter 8 Please read this manual thoroughly and all accompanying addendums before attempting to operate this instrument The 4100 Series Ohmmeters are available with a variety of test...

Page 9: ...et for the proper local AC line voltage and to verify that the proper fuse for this voltage has been installed as follows 105 to 125 VAC Amp Slo blo 210 to 250 VAC 0 125 Amp Slo blo Note These fuse va...

Page 10: ...ture around the unit exceed 50 C while the unit is in operation or 70 C when power is removed Safety Considerations The power plug must be a three contact device and should be inserted only into a thr...

Page 11: ...tions within the allowed range Model 4100ATC Range Maximum Input Resolution Test Current Accuracy 2 19999 10 1 A 0 02 of rdg 2 digits 2 1 9999 100 100 mA 0 02 of rdg 2 digits 20 19 999 1m 10 mA 0 02 o...

Page 12: ...um Input 2 Resolution Test Current 1 Accuracy 2 19999 10 100 mA 0 03 of rdg 3 digits 2 1 9999 100 10 mA 0 03 of rdg 3 digits 20 19 999 1m 1 mA 0 03 of rdg 3 digits 200 199 99 10m 100 A 0 03 of rdg 3 d...

Page 13: ...e Test Current Compliance Voltage 4100 4150 5 volts minimum Test Current Compliance Voltage 4165 selectable clamp at 50mV or 2V 5 Test Current Compliance Voltage 4165 1344 selectable clamp at 20mV or...

Page 14: ...Recommended Calibration Intervals The above accuracy specifications are valid for a period of 1 year following calibration thus for maintenance of these specifications a calibration interval of 1 yea...

Page 15: ...m C Option CK Compensator Extension Cable This option is a shielded extender cable to allow an Option CU or AL to be mounted up to 48 away from the ohmmeter Option RX3 Rack Mount Adapter The 4100 Seri...

Page 16: ...sting on a variety of screened or flat surfaces Test current is evenly distributed through the probe base while sensing is accomplished via a spring loaded center contact The MP 4 target area is 1 in...

Page 17: ...to trigger an alarm counter batch sorter or other device The 1248 also reduces operator workload by allowing him to make an instant determination of the test results The mating cable from the ohmmeter...

Page 18: ...test leads STD T C Switches These paragraphs apply only to Models 4100ATC and 4150ATC These switches are used to select T C or deselect STD the temperature compensating mode of operation These switch...

Page 19: ...on the display See Chapter 7 Open Circuit Voltage Switches These paragraphs apply only to Models 4165 and 4165 1344 The OPEN CIRCUIT VOLTAGE switches are used to select the desired maximum compliance...

Page 20: ...eled SEND on later units is used by the optional parallel printer or serial RS232C interface to control data transfer If the printer interface is installed pressing this button will generate a print o...

Page 21: ...amp slo blo Fuse values are doubled if the IEEE RS232C or Printer interface has been installed Refer to rear panel markings Replace blown fuses with their exact equivalent only BCD Interface This con...

Page 22: ...ot indicate a fault in the instrument The 4 Wire configuration of all Valhalla ohmmeters eliminates errors normally caused by test lead and contact resistances In many applications the contact resista...

Page 23: ...ent may be performed at any time but does not need to be performed before each measurement To make the adjustment select the 200 range and connect the ohmmeter to a precision 0 1 resistor Adjust the f...

Page 24: ...ing an overrange condition and then moving back up one range 7 Select the 2V clamp The resistance reading will be indicated on the display It is recommended that the OPEN CIRCUIT VOLTAGE selector be p...

Page 25: ...to varying ambient temperatures When the ATC mode is selected the temperature sensor Options AL and CU automatically senses the ambient temperature and adjusts the reading to indicate what the actual...

Page 26: ...ow BCD Interface Pin Number Data 1 1 2 2 3 4 4 8 6 10 7 20 8 40 9 80 11 100 12 200 13 400 14 800 16 1000 17 2000 18 4000 19 8000 21 10000 22 40 20000 overrange 26 5 VDC supply 50 0 VDC common 35 End o...

Page 27: ...n only and do not allow remote range control of the ohmmeter The Centronics print out option allows the ohmmeter to be connected to a variety of standard printer types The print out style may be confi...

Page 28: ...y Valhalla Model 2724A 2 DC Voltage source with available outputs of 0 to 200mV 2 V Valhalla Model 2701C 3 Four terminal test lead set Valhalla Option K or Option C 4 For 4165 4165 1344 only a voltmet...

Page 29: ...00 Voltage Full scale Adjustment 1 Set the 2701C to output 100mV for 4100ATC The ohmmeter uses negative voltages therefore the VOLTAGE HI terminal should be negative with respect to the VOLTAGE LO te...

Page 30: ...sistor and select the 200 range 2 Adjust R70 for a display indication of 100 00 2 digits 2K Range Adjustment 1 Connect the ohmmeter to the 1Kohm standard resistor and select the 2K range 2 Adjust R74...

Page 31: ...e input terminals of the ohmmeter to the 0 1 ohm standard resistor and select the 200 range 2 Adjust the front panel ZERO potentiometer for a display indication of 000 10 ohms 1 digit 20m Range Adjust...

Page 32: ...esistor and select the 200 range 2 Adjust R74 for a display indication of 100 00 2 digits 2K Range Adjustment 1 Connect the ohmmeter to the 1Kohm standard resistor and select the 2K range 2 Adjust R76...

Page 33: ...e test leads connect the input terminals of the ohmmeter to the 0 1 ohm standard resistor and select the 200 range 2 Adjust the front panel ZERO potentiometer for a display indication of 000 10 ohms 1...

Page 34: ...ighest voltage setting 2V 2 Connect the ohmmeter to the 10Kohm standard resistor and select the 2K range the display will flash indicating an overrange condition 3 Attach the voltmeter between the CUR...

Page 35: ...olution Do not use abrasive cleaners on the ohmmeter The front panel may be cleaned with a soft cloth and a Windex type cleaner if required Do not use petroleum based cleaners on the front panel If re...

Page 36: ...things that should be checked As it is not possible to anticipate all failure modes of the ohmmeter servicing personnel should become familiar with this Chapter of the manual to gain a complete under...

Page 37: ...ed as operational by applying a precise 100mV 4100ATC or 10mV all others to the VOLTAGE terminals The display should indicate 10000 counts no matter which resistance range is selected Detailed Circuit...

Page 38: ...the 6 95 VDC reference voltage to the negative 1 volt reference required by the current source Differential Amplifier The differential amplifier is shown on drawing number 4100 074 sheet 1 IC12 and i...

Page 39: ...Ohmmeter Models 4150ATC 4165 and 4165 1344 use a preamplifier stage consisting of IC101 and its associated components to boost the voltage input to the A to D converter up to the required levels The p...

Page 40: ...voltmeter is a highly accurate and stable 4 digit analog to digital converter A to D Unless it is receiving a definite input signal the output display of this A to D is ambiguous The display may indic...

Page 41: ...it to the load select the highest rightmost RANGE switch range possible 2 Settling times for inductive loads are greater than those of resistive loads A stable reading generally indicates that the ind...

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