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...