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

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...

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....

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

Shunt Resistors (5 1 8 watt unless noted) 1.8 (10 W), 40 (0.1 W), 440 (2 W), and 1k (5 W), and 22 k (5 W) Calibrator Configuration and Pre-check The Calibrator must be switched on and powered for at least 30 minutes prior to verification testing and the air filter inspected for adequate airflow. Refer to filter inspection and cleaning procedure provided in Chapter 4 for detailed cleaning instructions. Verification can only be performed using a controller as the Calibrator has no front panel...

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...

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...

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...

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...

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...

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,...

3

During calibration, it is a good idea to check the Calibrator fault queue after each calibration command. This will alert the user to any problems during the calibration. To check the fault queue, send the command ERR as shown below. print LFC ERR input LFC A print A The verification tests are used as the basis of Final product testing performed in manufacturing Automated test system design Product acceptance by the end user This section describes the minimum testing necessary to verify with...

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...