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VALHALLA SCIENTIFIC, INC.
MODEL 4300B/4350ATE
DIGITAL MICRO-OHMMETER
____________________
OPERATION MANUAL
8318 MIRAMAR MALL
SAN DIEGO, CA 92121
(858) 457-5576
(858) 457-0127 Fax
CERTIFICATION
______________________________________________________
Valhalla Scientific, Inc. certifies that this instrument was thoroughly tested and
inspected and found to meet published specifications when shipped from the
factory. Valhalla Scientific, Inc. further certifies that its calibration
measurements are traceable to the National Institute of Standards and
Technology to the extent allowed by NIST's calibration facility.
WARRANTY
______________________________________________________
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 or replace the instrument during the warranty period provided it is
returned to Valhalla Scientific, Inc. freight prepaid. No other warranty is
expressed or implied. We are not liable for consequential damages. Permission
and a return authorization number must be obtained directly from the factory
for warranty repairs. No liability will be accepted if returned without such
permission. Due to continuing product refinement and due to possible parts
manufacturer changes, Valhalla Scientific reserves the right to change any or all
specifications without notice.
2
TABLE OF CONTENTS
_______________________________________________________________
SECTION I UNPACKING & INSTALLATION ...................................................................................................5
1-1. INTRODUCTION ............................................................................................................................................5
1-2. INITIAL INSPECTION.....................................................................................................................................5
1-3. LINE VOLTAGE/FUSE SELECTION ................................................................................................................5
1-4. INSTRUCTIONS FOR BENCH USE ..................................................................................................................6
1-5. RACK MOUNTING ........................................................................................................................................6
1-6. SAFETY PRECAUTIONS ................................................................................................................................6
SECTION II SPECIFICATIONS ............................................................................................................................7
2-1. GENERAL.....................................................................................................................................................7
TABLE 2-1. Ranges and Resolutions ....................................................................................................................8
TABLE 2-2. Environmental, Power, and Physical Requirements.......................................................................8
SECTION III OPTIONAL EQUIPMENT..............................................................................................................9
3-1 AVAILABLE OPTIONS ..................................................................................................................................9
3-2. TEST LEADS ..............................................................................................................................................10
SECTION IV MANUAL OPERATION................................................................................................................11
4-1. GENERAL...................................................................................................................................................11
4-2. CONNECTIONS ...........................................................................................................................................11
Figure 4-1 - Error Sources in Resistance Measurements ..................................................................................12
4-3. SETTING VOLTAGE AND TEST CURRENT ...................................................................................................12
4-4. CHARGING INDUCTOR MODE ....................................................................................................................12
4-5. CABLE DISCONNECT STATUS INDICATORS ................................................................................................13
4-6. TEMPERATURE COMPENSATION ................................................................................................................14
SECTION V REMOTE OPERATION .................................................................................................................15
5-1. GENERAL...................................................................................................................................................15
5-2. THE PURPOSE OF IEEE STANDARD 488.....................................................................................................15
5-3. DEFINITIONS ..............................................................................................................................................15
5-4. BUS RESTRICTIONS....................................................................................................................................16
5-5. DETAILED DESCRIPTIONS OF BUS OPERATIONS.........................................................................................16
5-6. SETTING THE IEEE ADDRESS ....................................................................................................................18
5-7. REMOTE AND LOCAL STATES ....................................................................................................................19
5-8. READING THE DISPLAY DATA ...................................................................................................................19
5-9. 4300B COMMAND SET FOR GPIB .............................................................................................................20
Table 5-2. 4300B IEEE Commands - Quick Reference........................................................................................24
SECTION VI OPTION BCD..................................................................................................................................25
6-1. GENERAL...................................................................................................................................................25
6-2. BCD PIN ASSIGNMENTS ............................................................................................................................25
Table 6-1. BCD Pin Functions............................................................................................................................26
SECTION VII THEORY OF OPERATION ........................................................................................................27
7-1. GENERAL...................................................................................................................................................27
7-2. GENERAL DESCRIPTION OF CIRCUITS ........................................................................................................27
7-3. DETAILED CIRCUIT DESCRIPTIONS ............................................................................................................28
Table 7-1. A-D Converter Buffer Gains...............................................................................................................31
7-4. TROUBLESHOOTING ...................................................................................................................................33
3
SECTION VIII CALIBRATION PROCEDURE.................................................................................................34
8-1. GENERAL...................................................................................................................................................34
8-2. REQUIRED TEST EQUIPMENT .....................................................................................................................34
8-3. VOLTMETER CALIBRATION .......................................................................................................................34
8-4. CURRENT SOURCE CALIBRATION ..............................................................................................................35
SECTION IX SPECIAL PROCEDURES.............................................................................................................37
9-1. GENERAL...................................................................................................................................................37
9-2. CONNECTIONS AND SETTLING TIME ..........................................................................................................37
9-3. NOISY READINGS ......................................................................................................................................37
9-4. DISCONNECTING THE CABLES ...................................................................................................................38
SECTION X MANUAL CHANGES .....................................................................................................................40
ADDENDUM 10-1: 4350ATE SPECIFICATIONS..............................................................................................41
SECTION XI PARTS LISTS .................................................................................................................................42
SECTION XII DRAWINGS AND SCHEMATICS .............................................................................................43
4
SECTION I UNPACKING & INSTALLATION
_______________________________________________________________
1-1. Introduction
The Model 4300B is a unique instrument capable of handling even the toughest resistance measurement
applications. The 4300B is designed to measure the low resistance of such items as coils, transformers,
ballasts, heater elements, etc. Some features of the 4300B that give it an edge over competitive products are:
"Charging Inductor" mode for reduced settling times.
"Disconnect Status" indicators designed with safety in mind.
Full 4-wire Kelvin terminal configuration.
Fully selectable test currents up to 10 amps.
Available locking rear Bendix connectors.
Available data outputs and remote programming capability.
Available high-speed version for assembly lines (4350ATE).
These features and more are discussed fully in the operating instructions of this manual. This device may be
dangerous if used in a manner contrary to its design! Please read this manual thoroughly before operating
your 4300B (4350ATE).
1-2. Initial Inspection
If the shipping carton is damaged, request that the carrier's agent be present when the unit is unpacked. If the
instrument appears damaged, the carrier's agent should authorize repairs before the unit is returned to the
factory. Even if the instrument appears undamaged, it may have suffered internal damage in transit that may
not be evident until the unit is operated or tested to verify conformance with its specifications. If the unit fails
to operate or fails to meet the performance specifications of Section 2, 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.
1-3. Line Voltage/Fuse Selection
The only adjustments required before placing the unit in operation are to set the rear panel switch to the
correct local AC line voltage and verify that the proper fuse for this voltage is installed as follows:
105 to 125 VAC = 3 Amp Slo-blo
210 to 250 VAC = 1 Amp Slo-blo
5
1-4. Instructions for Bench Use
The unit is supplied with all the hardware required for bench use and special instructions for use in this
manner are not necessary. However, before connecting the unit to the local power source, verify that the
power cord is equipped with a three-terminal connector (see the Safety Precautions of paragraph 1-6).
1-5. Rack Mounting
Optional brackets are available for mounting the Model 4300B (4350ATE) in a standard 19" equipment rack.
These are listed in Section 3. The size of the unit and the location of its center of gravity dictate 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.
It is recommended that blank panels at least 1.75 inches high be installed between this and any other units in
the rack to ensure freedom of air flow. Under no circumstances should the ambient air temperature around the
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