100

Diagnostics which may be executed as a remote command, check that the relays are working, and that each of the resistances is close to its calibrated value. If problems are found, an error message is printed. The error messages can be found in Appendix A of the 57LFC AN Operators Manual. Table 2-12 lists a few of the relay settings after a power up. Ohms diagnostics work as follows for each resistance in turn Sets the relays (see Table 2-8, ORLY) to the DIAG state for the resistance desired....

21167200

Connect the Calibrator to the 8508A as shown in Figure 3-8. Apply the load to the 8508A terminals. For safety reasons, please observe the power limits of the resistors used in the test. See Table 3-9 for power limits. Apply the maximum dc current output (1.8 Q load for 4 V compliance voltage) when set to 2.19 A dc. Verify that the current remains at the correct limit by measuring the current as described in the resistance accuracy test earlier in this Chapter. Table 3-9. Current Output...

2188805 V

The harmonic ac voltage test verifies that the output ac signal has a limited amount of noise in the signal. For these tests, the use of the distortion analyzer or spectrum analyzer is required. Follow the vendor's specifications for setting up those instruments. The connection used will depend on which test instrument is used. Figure 10 shows the set up used for a Booton 1130A and Agilent 4411A instrument. The Booton is used below 30 kHz and the Agilent is used above 30 kHz. A set of test...

21889933

AAWarning This instrument is capable of outputting lethal voltages. Observe all safety precautions while performing this test. Connect the Calibrator to the 8508A as shown in Figure 3-9. Apply the load to the 8508A terminals. For safety reasons, please observe the power limits of the resistors used in the test. Table 3-10 contains the test limits. Apply the maximum load (440 Q for 50 mA) to the dc voltage output when set to 21.9 V dc (using 8508A to measure). Verify that the voltage is at the...

21910067

The ac current amplitude accuracy test verifies the accuracy of AC Current at the Calibrator output terminals. First use the 5720A to characterize all the points in Table 38. Next, connect the equipment as shown in Figure 3-7 and verify the Calibrator is within the limits shown in Table 3-8. Maximum compliance voltage is 4 V in 2.2 A range and 7 V on other ranges

3

Confirm Cal Enable (J1) is in the disabled condition before starting the rest of the verification procedures. If the unit passes all tests. Cover the Cal Enable switch with a calibration label. The dc voltage amplitude accuracy test verifies the accuracy of dc voltage at the Calibrator front panel output terminals. Use the specifications in Chapter 1 to determine maximum load for testing. Connect the equipment as shown in Figure 3-1 and verify the Calibrator is within the limits shown in Table...

375 V

The amplifier input stages are operated from 15 V rails. Regulator circuits for the high voltage rails are located on-the A8 High Voltage PCA while the 15 V rails are derived externally. The amplifier input stages are operated from 15 V rails. Regulator circuits for the high voltage rails are located on-the A8 High Voltage PCA while the 15 V rails are derived externally. In the 220 V range relays K3 and K4 route the input signal (V3_3) and it's associated ground (RCOM1) from connector P108 to...

A

Refer to the manual to maintain the safety provided by the equipment. Do not operate this calibrator in a position where it is difficult to operate the power switch. Do not operate this calibrator in a manner not specified in the manual or the protection provided by the equipment may be impaired. Do not operate the calibrator if it shows signs of damage or malfunction, the protection provided by the equipment may be impaired. Do not use hook-up wire on the calibrator...

A1 Led Pca25

A3 Motherboard Relay Control and Switch LED Control and Output Signal Low Volt In-guard Power Outguard Power Miscellaneous Troubleshooting Test List of A5 Ohms Precision Resistor Relay Switch Matrix and Other Control Guard Compensation A6 Digital Synthesis Precision, Dual Tracking, + -7 V Precision, 28bit, PWM, Dual DC Voltage DDS Waveform AC Voltage DC Current AC Current Thermocouple Temperature Iso-thermal Block Reference Junction Temperature Thermocouple Voltage Thermocouple Temperature...

C

Line Voltage (selectable) 100 V, 120 V, 208 V, and 230 V Line Frequency 47 to 63 Hz Line Voltage Variation 7 about line voltage setting Maximum VA 200 Settling 3 to 10 seconds, similar to 5700A. Chassis Dimensions, H x W x D 178 mm x 432 mm x 457 mm (7 in x 17 in x 18 in) maximum than 18.15 kg (40 pounds) Electrical Signal Interface Fluke 5700A LP equivalent signal interface, AC Mains, IEEE-488, and RS-232 connectors, AC power switch, and Line Voltage selection all on front panel cubic meters...

Calibration

Calibration of the 57LFC is accomplished using two internal calibration procedures. The first of these is an offset or zero calibration and requires no external standards. The second procedure is used to establish range gains and other constants using external standards. The first internal procedure will be referred to as zero calibration and the second will be referred to as main calibration for the remainder of this discussion. See Table 3-1 for a list of the equipment required by the main...

Claims

Immediately upon arrival, purchaser shall check the packing container against the enclosed packing list and shall, within thirty (30) days of arrival, give Fluke notice of shortages or any nonconformity with the terms of the order. If purchaser fails to five notice, the delivery shall be deemed to conform with the terms of the order. The purchaser assumes all risk of loss or damage to instruments upon delivery by Fluke to the carrier. If an instrument is damaged in transit, PURCHASER MUST FILE...

Cleaning the Air Filter

Damage caused by overheating may occur if the area around the fan is restricted, the intake air is too warm, or the air filter becomes clogged. The air filter must be removed and cleaned at least every 30 days, or more frequently if the calibrator is operated in a dusty environment. The air filter is accessible from the rear panel of the Calibrator. To clean the air filter 2. Remove the filter by pulling the filter's retainer downwards (it hinges at the bottom) and removing the filter element....

Diag

DIAG (The diagnostics procedure as described in that section). print LFC cal_start diag There are four types of calibration steps RUN, INS, REF and NOT. Whenever a calibration procedure is running the controller may query the Calibrator to determine which of the four types of steps is currently being executed by the internal calibration engine. To query the Calibrator for the calibration step type, use the CAL_STATE Command. As described below, the controller is expected to take different...

Frequency Accuracy Test

The specification for frequency is 100 ppm (0.01 ). Connect the 8508A to the Calibrator output terminals as shown in Figure 3-3. Then set the Calibrator to 2 V at the output frequencies specified in Table 3-4. Verify that the meter reads within the limits specified on the test record.

Info

Internal Measure Opt 3.3 V A6 Output Internal Measure 2.2 V Buffer Output Key x don't care, r reset, s set, d reset (0) for internal sense or set (1) for remote sense, g reset (0) for external An over-voltage detection or other serious problem should trip the instrument to the fault state. An over-compliance or over-current detection should trip the instrument to the appropriate overload fault. A hardware fault causes the instrument to enter the fault state. Table 2-4. Control Register States...

Interference Information

This equipment generates and uses radio frequency energy and if not installed and used in strict accordance with the manufacturer's instructions, may cause interference to radio and television reception. It has been type tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference in a residential installation. However, there is...

Introduction

The Fluke Model 57LFC System Calibrator (hereafter called the Calibrator) is a precise instrument that calibrates a wide variety of electrical measuring instruments. This calibrator maintains a high accuracy over a wide ambient temperature range, and is able to test instruments in harsh environments, eliminating the restriction of calibrating only in a temperature-controlled standards laboratory. With a 57LFC, you can calibrate precision multimeters that measure ac or dc voltage, ac or dc...

K11

Reset provide an internal 220 V sense path connect OUT_220V to VMID Set normal operation disconnect OUT_220V from VMID On power up, the relays are forced into a benign setting to protect circuitry and the customer. Table 2-2 shows the state of the A3 Motherboard PCA relays after power up. Table 2-3 shows the A3 Motherboard PCA relay states when in several states (power up and standby). Table 2-4 shows the status of control lines for all modes of A3 Motherboard PCA operation. Table 2-2. A3...

List of Figures

Block Diagram of the A5 Ohms 2-3. A5 Ohms PCA High Low 2-4. A5 Ohms PCA High Low 2-5. DC Current 2-6. AC Current 2-7. A8 High Voltage PCA 22 V and 220 V 3-1. 8508A Connections to the 57LFC for DC Volts 3-2. 8508A Connections to the 57LFC for AC Volts 3-3. 8508A Connections to the 57LFC for AC Frequency 3-4. 8508A Connections to the 57LFC for 4-Wire 3-5. 8508A Connections to the 57LFC for 2-Wire Compensated 3-6. 8508A Connections to the 57LFC for DC Current 3-7. 8508A...

Na

1 Discrete resistors with characterized values stored in non-volatile memory. Specifications apply to the characterized value using 4-wire connections. 2 Active two-wire compensation may be selected for values up to 190 kn. Active compensation is 11 mA load and 2 V burden minimum. tcal 5 C ( output + V) 1 year 1 Remote sensing provided on all but 22 mV and 220 mV ranges. Maximum output current is reduced by 50 above 40 C. Maximum load capacitance is 500 pF. Note Frequency uncertainty is...

Not

NOT simply means that the calibration procedure in no longer running. If the controller determines that the NOT step was returned due to a normal termination of the calibration procedure, a CAL_STORE command MUST be issued to store the newly derived calibration constants into non volatile memory. Once the calibration constants are saved, it is a good idea to reset the instrument using a *RST command For a complete list of remote commands for calibration see Chapter 3 of the 57LFC AN Operators...

Not34

Verification Test Calibrator Configuration and DC Voltage AC Voltage AC Voltage Accuracy Frequency Accuracy DC Current AC Current Current Output Compliance Voltage Output Compliance Harmonic Test Levels for AC Harmonic AC Current External Verification Test Check Replacing the Cleaning the Air Replacing PCA Cleaning the 5 List of Replaceable How to Obtain Service Parts 6 Schematic

Reference Step REF

A reference step, like an INS step, causes the procedure to pause and an instruction is made available via the CAL_INFO command. Additionally, the controller is expected to supply a floating point number. This number is typically a reference reading from an external DMM. As an example, the internal calibration procedure may setup the Calibrator to source 1.9 V. Then a REF step would prompt the user to go to operate. The controller would need to send the operate command and command an external...

Replacing PCA Modules

Follow the steps below to replace PCA modules in the Calibrator. Refer to Figure 4-3 for a disassembly illustration and the location of the PCA modules. 1. Turn the Calibrator off and disconnect line power. 2. Remove the six screws holding the top cover in place. Remove the top cover. 3. Remove the two screws holding the guard cover in place. Tilt the guard cover up and leave vertical or remove the guard cover. 4. Remove the required module using the module extractors. Figure 4-3. Exploded View...

S

A5 Ohms PCA High Low Sense Figure 2-4. A5 Ohms PCA High Low Sense Table 2-7 provides a functional description of the relay function for either the set or reset condition on the A5 Ohms PCA. Table 2-8 provides information on the hardware control map for the relays and shows the relay setting for each state. Table 2-9 shows the final relay states by instrument state. Table 2-7. Functional Description of A5 Ohms PCA Relays Table 2-7. Functional Description of A5 Ohms PCA Relays

Service Centers

All Calibrators delivered to the Navy, contractors and subcontractors for the RTCASS program will be repaired and calibrated at the Fluke Technical Support Center in Everett, Washington. Contact Fluke Technical Support at 1-888-993-5853 or by sending a fax to 1-425-446-6390. The address for the Fluke Technical Support Center is Fluke Technical Support Center 1420 75th ST SW Everett, WA 98203-6256 U. S. A. Once full production is started the following service centers will also maintain and...

Service Information

Each calibrator is warranted to the original purchaser for a period of one year beginning on the date received. The warranty is located at the front of this manual. Service and technical advice for the calibrator is available at Fluke Service Centers. For a complete list of Fluke Service Centers, visit www.fluke.com. A worldwide network of Fluke service centers supports Fluke instruments and assists customers in many ways. Most service centers have standards and calibration laboratories...

Specifications

The 57LFC System Calibrators are verified and calibrated at the factory prior to shipment to ensure they meet the accuracy standards required for all certified calibration laboratories. By calibrating to the specifications in this chapter, you can maintain the high performance level throughout the life of your calibrator. Specifications are valid after a warm-up period of twice the time the calibrator has been turned off, up to a maximum of 30 minutes. For example, if the calibrator has been...

Terms in this Manual

This instrument has been designed and tested in accordance with the safety standards listed in the General Specifications, which are located in Chapter 1 of this manual. This manual contains information and warnings which have to be followed by the user to ensure safe operation and to retain the instrument in safe condition. AAWARNING statements identify conditions or practices that could result in personal injury or loss of life. AACAUTION statements identify conditions or practices that could...

Use Care When Servicing With Power On

Dangerous voltage exist at many points inside this product. To avoid personal injury, do not touch exposed connections and components while power is on. Whenever the nature of the operation permits, keep one hand away from equipment to reduce the hazard of current flowing through vital organs of the body. Do not wear a grounded wrist strap while working on this product. A grounded wrist strap increase the risk of current flowing through the body. Disconnect power before removing protective...

A7 Current PCA

Figure 2-4 shows the operation of DC current functions. The DC input signal to the A7 Current PCA comes from the A6 Digital Synthesis PCA on the I_ACDC line. The signal is generated by a high resolution digital-to-analog-converter (IDAC), buffered by amplifier U58, divided by Z1, and applied to the positive input of amplifier U9. The output of U9 is the I_ACDC signal. The negative input of U9 is connected to the IFBK line, which is the feedback from the shunt amplifier on the A7 Current PCA. In...

Limited Warranty And Limitation Of Liability

Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in Fluke's opinion, has been misused, altered, neglected, contaminated, or...

A9 Out Guard Cpu Pca

The CPU manages all of the internal remote functions including IEEE-488 and RS-232 remote communication, calibration enable, watchdog timer, serial communication with the FPGA on the A6 Digital Synthesis PCA. See Sheet 1 of the A9 Out-Guard CPU PCA schematic. The main processor (U10) is a Motorola 68306 that runs on code stored in flash memory (See Sheet 2 of the A9 Out-Guard CPU PCA schematic). The processor directs all internal operations in the Calibrator. It receives commands from the...

A8 High Voltage PCA

The function of the A8 High Voltage PCA is to amplify the 2.2 V (nominal max.) signal from the A6 Digital Synthesis PCA to the output levels required for the 22 V and 220 V ranges. The A11 Isothermal PCA is assembled and tested as part of the A8 High Voltage PCA. This is accomplished by employing separate amplifiers for each range. These amplifiers have gains of 10 and 100 for the 22 V and 220 V ranges respectively. The exact gain of each amplifier is not critical as overall amplitude control...

A6 Digital Synthesis PCA

The A6 Digital Synthesis PCA contains the following functional blocks Precision, dual tracking, + -7 V references Two precision, 28 bit, pulse width modulated, digital to analog converters (DAC's) A 500 kHz, dual channel, variable phase, arbitrary waveform generator A 3.3 V, AC DC output amplifier A 33 mV 330 mV, 50 D output attenuator A 0.33 V - 1000 V sense divider and buffer amplifier Two ac dc averaging converters Two amplitude control loops, for dual channel operation An 18 bit analog to...

52 A1 Led Pca59

A5 Ohms 5-5. A6 Digital Synthesis 5-6. A7 Current 5-7. A8 High Voltage 5-8. A9 Out-Guard 6-1. A1 LED 6-2. A3 Motherboard 6-3. A5 Ohms 6-4. A6 Digital Synthesis 6-5. A7 Current 6-6. A8 High Voltage 6-7. A9 Out-Guard CPU Service Low Thermal EMF Test Shielded IEEE-488 Cables (Y8021, Y8022, and Accuracy

A5 Ohms PCA

The following discussion covers the theory of operations for the A5 Ohms PCA circuitry. The A5 Ohms PCA sources 1x and 1.9x fixed value resistances, provides compensation, and generates an active guard. The A5 Ohms PCA can source ohms in one of several ways two-wire, two-wire with compensation, and four-wire ohms. For discussion purposes, the A5 Ohms PCA can be divided into several areas precision thin film resistor networks, relay switch matrix and control circuits, other control circuits,...

11

Key x don't care, H High (Off), L Low (On) Sheet 5 of the schematic shows the LED control (panel LED's connector). The LEDs are mounted on their own daughter card with control wires cabled from the A3 Motherboard PCA. A description of each LED is provided in Table 2-5. Table 2-5. Functional Description of LED Signals Table 2-5. Functional Description of LED Signals Turns on the STANDBY LED when asserted Low (YELLOW) Turns on the OPERATE LED when asserted Low (GREEN) Turns on the WARNING LED...