Table of Contents
Related Manuals for Valhalla 4100 SERIES
Summary of Contents for Valhalla 4100 SERIES
- Page 1 ® Advanced Test Equipment Rentals www.atecorp.com 800-404-ATEC (2832) Valhalla Scientific, Inc. 4100 SERIES DIGITAL OHMMETER OPERATION MANUAL 8318 Miramar Mall San Diego, CA 92121 P: 858/457-5576 F: 858/457-0127 www.valhallascientific.com...
- Page 2 The warranty 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 provided it is returned to Valhalla Scientific, Inc. freight prepaid. No other warranty is expressed or implied.
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Page 3: Safety Symbols
Documentation History All Editions and Updates of this manual and their creation date are listed below. The first Edition of the manual is 1. The Edition Number increments by 1 whenever the manual is revised. Updates, which are issued between Editions, contain replacement pages to correct or add additional information to the current Edition of the manual. -
Page 4: Warnings
REMOVE POWER and do not use the product until safe operation can be verified by service-trained personnel. If necessary, return the product to Valhalla Scientific for service and repair to ensure that safety features are maintained. -
Page 5: Table Of Contents
Contents Safety Symbols Chapter 6 Rear Panel Connectors 21 WARNINGS General Power Connector Chapter 1 General Information Fuseholder Introduction BCD Interface Manual Description Other Interfaces Instrument Description Instrument Identification Chapter 7 Manual Operations General Chapter 2 Unpacking & Installing 9 Connections Inspection 4100ATC &... - Page 6 Chapter 12 Addendums Chapter 14 Schematics/Drawings 60 Addendums 4100-074 1 of 4 Chapter 13 Parts List 4100-074 2 of 4 4100ATC Main Board Assembly 4100-074 3 of 4 4150ATC Main Board Assembly 4100-074 4 of 4 Final Assembly 4165-070 1 of 1 4100/4150 Display Bd.
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Page 7: Chapter 1 General Information
This manual has information to perform Inspection, Installation, Measurement Operations, and Troubleshooting for Valhalla Scientific 4100 Series. Also included in this manual are: Specifications, Parts Lists and all Schematics. The following instruments are part of the 4100 Series Ohmmeters: 4100ATC, 4150ATC, 4165 and 4165-1344 Manual Description This manual is separated into the 14 following Chapters. -
Page 8: Instrument Description
(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 probes, accessories, and data output (see Chapter 4). -
Page 9: Chapter 2 Unpacking & Installing
If the unit fails to operate or fails to meet the performance specifications of Chapter 3, notify the carrier's agent and the nearest Valhalla Sales Office. Retain the shipping carton for the carrier's inspection. DO NOT return equipment to Valhalla Scientific or any of its sales offices prior to obtaining authorization to do so. -
Page 10: Safety Considerations
that it must be supported on both sides along its entire length through the use of trays or slides. If it is to be transported while mounted in a rack, it should be supported so as to prevent upward or downward movement. -
Page 11: Chapter 3 Specifications
Specifications General The specifications for the 4100 Series of Ohmmeters are listed in the following paragraphs. In all cases the specifications are valid for full Kelvin Four-Terminal measurements using connections having less than 20 milliohms of lead resistance per wire. - Page 12 Model 4165 Range Maximum Input Resolution Test Current Accuracy .2Ω .19999 Ω 10µΩ 100 mA ±0.03% of rdg ±3 digits 2Ω 1.9999 Ω 100µΩ 10 mA ±0.03% of rdg ±3 digits 20Ω 19.999 Ω 1mΩ 1 mA ±0.03% of rdg ±3 digits 200Ω...
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Page 13: General Specifications
General Specifications Display Type: ....................4½ digit LED (20000 counts) A-to-D Conversion Rate:....................400 milliseconds ATC Mode (4100 and 4150 only):........Add ±0.05% + 0.001%/°C to accuracy spec Compensator Accuracy: ............±0.1% of rated temperature coefficient Overrange: ................100% of range (19999 counts on display) Overrange Indication: ...................... -
Page 14: Recommended Calibration Interval
Weights (serial# 8-3637 and higher):.......12lbs(5.5kg) NET; 16lbs(7.5kg) SHIPPING 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 year is recommended. More frequent calibrations may be performed as desired. -
Page 15: Chapter 4 Optional Equipment
Chapter 4 Optional Equipment General The 4100 series of Ohmmeters are shipped with a detachable power cord and an Operation Manual as standard equipment. This Chapter lists several items that may be desirable for special applications. Available Options Listed below are the options available for use with the 4100 Series of Ohmmeters. - Page 16 Option KK: 4-Wire Kelvin Lead Set Option "KK" is a heavy-duty 4-wire Kelvin cable set, 48-inches in length terminated in "JAWS" clamps for measuring large motors, bushings, etc. Opening is 2". Option MP-1: Kelvin Micro-Probes Option "MP-1" is a 48-inch shielded Kelvin 4-wire cable set with a 1-ampere test current capacity employing a set of Kelvin Micro-Probes.
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Page 17: Interface
Valhalla Model 1248. (See Chapter 8) Model 1248: Dual-Limit Comparator The Valhalla Model 1248 may be used in conjunction with a 4100 Series Ohmmeter and Option BCD above. The Model 1248 is a dual-limit BCD comparator that interprets the display indications of the ohmmeter as either "HI", "LO"... -
Page 18: Chapter 5 Front Panel Controls
(e.g., option "CU" or "AL") for operation of these products in the T.C. mode via up to 48" of RG58CU cable (Valhalla Option CK). This sensor simulates a constant temperature chamber and will accurately monitor the ambient temperature and correct the displayed... -
Page 19: Voltage & Current Terminal
To achieve the best results when using the T.C. mode of operation the user should ensure that the sensor is in the same environment as the test load, and is not in any large air currents which may cause cooling effects. -
Page 20: Polarity Reverse Switch
Polarity Reverse Switch These paragraphs apply to the Model 4165-1344 only. This switch allows the effects of thermal emf's to be measured and corrected for by averaging the measurements obtained on both polarities. An estimation of the thermal emf's present may be obtained by the formula: −... -
Page 21: Chapter 6 Rear Panel Connectors
Chapter 8. Other Interfaces The 4100 Series is available with a choice of three common interfaces for remote data acquisition. These include GPIB (IEEE-488.2), RS232C, or a Centronics parallel printer interface. These interfaces are for data acquisition only, and do not allow remote range control of the ohmmeter. -
Page 22: Chapter 7 Manual Operations
Connections to the ohmmeter are made via 4 binding posts on the front panel of the instrument. When using Valhalla test leads, the tabbed side of each banana jack is connected to the CURRENT terminals (see below). This ensures that current is carried in the largest conductor of the cable, and that the voltage input is shielded. -
Page 23: 4100Atc & 4150Atc Operations
Figure 1 Error Sources in Resistance Measurements 4100ATC and 4150ATC Operations The guidelines below should be followed for taking measurements using Models 4100ATC and 4150ATC: Connect the test leads to the ohmmeter as described in the last section of this chapter. Select the highest resistance range (20KΩ... -
Page 24: 4165 Operations
4165 Operations The guidelines below should be followed for taking measurements using the Model 4165 Contact Resistance Ohmmeter: Select the 50mV maximum open-circuit voltage. This limits the maximum voltage that will be present at the CURRENT terminals in a no load situation to ensure a dry measurement. Select the 20KΩ... -
Page 25: Temperature Compensation
The ATC mode is selected by pressing the T.C. push-button. The temperature sensors are connected to the ohmmeter via the front panel BNC connector. The temperature sensor may be may be placed in closer proximity to the device under test using a Valhalla Option "CK" compensator extension cable. -
Page 26: Chapter 8 Interface Operations
Interface Operations General The 4100 Series of ohmmeters is now available with a choice of two data outputs. The standard output provides data in a binary-coded-decimal format. The latest data output available is a parallel printer port for connecting directly to a Centronics compatible printer. Both interfaces are described below. -
Page 27: Other Interfaces
Other Interfaces The 4100 Series is available with your choice of three common interfaces for remote data acquisition. These include GPIB (IEEE-488.2), RS-232C, and a Centronics parallel printer interface. These interfaces are for data acquisition only, and do not allow remote range control of the ohmmeter. -
Page 28: Chapter 9 Routine Maintenance
General This Chapter provides general maintenance information and a procedure for calibrating the ohmmeter. The Model 4100 Series ohmmeters should be calibrated on a routine basis (every 12 months is recommended) to ensure continued accuracy. Before performing the calibration procedure below, the ohmmeter should be allowed to warm up at a stable temperature for at least 30 minutes with the covers in place. -
Page 29: 4100Atc Calibration Procedure
The locations of the adjustment potentiometers are shown on the drawing number 4100-600 at the back of this manual. Leave the cover in place as much as possible. After each adjustment is made, the cover should be replaced and the instrument allowed to stabilizing. CAUTION! Dangerous AC line voltages exist inside the instrument. - Page 30 20Ω Range Adjustment 1) Connect the ohmmeter to the 10 ohm standard resistor and select the 20Ω range. 2) Adjust R66 for a display indication of 10.000 ±2 digits. 200Ω Range Adjustment 1) Connect the ohmmeter to the 100 ohm standard resistor and select the 200Ω range. 2) Adjust R70 for a display indication of 100.00 ±2 digits.
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Page 31: 4150Atc Calibration Procedure
4150ATC Calibration Procedure Voltage Zero Adjustment 1) Connect the voltage standard (2701C) at 0 volts to the VOLTAGE HI and LO terminals. 2) Select the 200Ω range and the STD mode. 3) Adjust the front panel ZERO potentiometer so that the display indicates 000.00. Voltage Full-scale Adjustment 1) Set the 2701C to output 10mV. - Page 32 200Ω Range Adjustment 1) Connect the ohmmeter to the 100 ohm standard resistor and select the 200Ω range. 2) Adjust R74 for a display indication of 100.00 ±2 digits. 2KΩ Range Adjustment 1) Connect the ohmmeter to the 1Kohm standard resistor and select the 2KΩ range. 2) Adjust R76 for a display indication of 1.0000 ±2 digits.
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Page 33: 4165 And 4165-1344 Cal. Procedure
4165 and 4165-1344 Calibration Procedure Voltage Zero Adjustment 1) Connect the voltage standard (2701C) at 0 volts to the VOLTAGE HI and LO terminals. 2) Select the 200Ω range and the 2V clamp and NORMAL polarity. 3) Adjust the front panel ZERO potentiometer so that the display indicates 000.00. Voltage Full-scale Adjustment 1) Set the 2701C to output 100mV for 4100ATC. - Page 34 2KΩ Range Adjustment 1) Connect the ohmmeter to the 1Kohm standard resistor and select the 2KΩ range. 2) Adjust R74 for a display indication of 1.0000 ±2 digits. 20KΩ Range Adjustment 1) Connect the ohmmeter to the 10Kohm standard resistor and select the 20KΩ range. 2) Adjust R76 for a display indication of 10.000 ±2 digits.
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Page 35: Periodic Maintenance
Periodic Maintenance The 4100 Series of ohmmeters do not require any periodic maintenance other than an occasional cleaning of the exterior surfaces of the product and routine performance of the calibration procedure. Loose dirt or dust which may have collected on the exterior surface of the ohmmeter may be removed with a soft cloth or brush. -
Page 36: Chapter 10 Theory Of Operation
Use only the specified replacement component or its exact equivalent. Spare parts can be ordered from your nearest Valhalla Scientific Service Center or from the factory directly by referring to the Valhalla Stock Number listed in the Parts Lists section at the back of this manual. -
Page 37: General Circuit Descriptions
General Circuit Descriptions The ohmmeter may be easily thought of as consisting of two separate parts. 1) A constant-current source. This half of the ohmmeter provides a stable test current that is passed through the load to develop a voltage across it. The value of this current for each range is indicated on the front panel of the instrument. -
Page 38: Constant Current Source
Constant-Current Source The constant-current source provides the stable current necessary to generate the precise voltage drop across the load. The design of the current source compensates for all series resistance (within compliance voltage limits) to overcome the effects of test lead and contact resistances. Reference Generator The reference generator is shown on the drawing 4100-074 sheet 2. -
Page 39: Analog To Digital Converter
Board. The 1020 takes range information from contacts of the range switches and digital data from the voltmeter. It decodes this information and makes it available at any of four ports. A complete description of the operation of this interface is beyond the scope of this manual. Please contact Valhalla Scientific if problems are encountered. -
Page 40: Chapter 11 Special Procedures
The display indications should be ignored unless there is a definite measurement being taken. If this wandering display is not acceptable, the ohmmeter can be made to indicate an overrange condition whenever the terminals are opened either by using a 4-wire Kelvin type lead set (Valhalla Option "K") or by shorting the V and I terminals together. -
Page 41: Connection To Inductive Load
Connecting to Inductive Loads The measurement of inductive loads (transformers, ballasts, coils, magnets, chokes, etc.) requires that special precautions be taken in order to ensure safety and maximize performance. Other than the noise considerations mentioned in the last section of this chapter, the following items should be noted: 1) Prior to connecting the unit to the load, select the highest (rightmost RANGE switch) range possible.