Philips PM2517X - User Manual

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Summary

1. TECHNICAL DATA

1.1. ELECTRICAL SPECIFICATIONS

1.1.2. A.C. voltage measurements

1.1.3. D.C. current measurements

1.1.4. A.C. current measurements

1.1.5. Resistance measurements

3. CIRCUIT DESCRIPTION

3.1. GENERAL

3.2. PRINCIPLE OF OPERATION (Fig. 10)

3.2.1. General

3.2.2. Analog section

3.2.2.1. Direct voltage measurements (Fig. 12)

3.2.2.2. Alternating voltage measurements

3.2.2.3. Direct and alternating current measurement

3.2.2.4. Resistance measurements

3.2.3. Analog to digital convertor

Explains the Delta Modulation ADC principle and its components.

3.2.4. Digital section

Covers the digital control, display driver, and logic circuits.

3.2.5. Power supply

3.3. DETAILED CIRCUIT DESCRIPTION

3.3.1. General (Fig. 11)

3.3.2. Analog section

3.3.2.1. Dc voltage measurements (Fig. 12)

3.3.2.2. A.c. voltage measurements (Fig. 13)

3.3.2.3. D.c. current Measurements (Fig. 14)

3.3.2.4. A.c. current measurements (Fig. 15)

3.3.2.5. Resistance measurements (Fig.s 16, 17 and 18)

3.3.3. ADC

Explains the Analog-to-Digital Converter operation.

3.3.3.1. General (Fig. 20)

3.3.3.2. Voltage to current convertor OO 0064 (Fig. 20)

3.3.3.3. ADC switching part OO 0060 (Fig. 20)

3.3.4. Digital section

Covers the digital control, display driver, and logic circuits.

3.3.4.1. General

3.3.4.2. Control logic (Fig.23)

Explains the central control logic and timing within the instrument.

3.3.4.3. Control signals (Fig. 54 and 22)

3.3.5. Display unit N2 (Fig.25 and 54)

3.3.5.1. General

3.3.6. Power supply (Fig.26 and S4)

3.4. SPECIFICATION OF ICS USED IN THE PM 2517

3.4.1. HEF 4511 B BCD to 7-segment latch decoder

3.4.3. OO 0055 Character Decoder Driver

3.4.3.2. Specification of in- and outputs of the OO 0055

3.4.5. OO 0060 Switching part of the ADC

3.4.6. OO 0061 AC to DC convertor

3.4.6.1. General

3.4.6.2. Specifications of inputs and outputs

3.4.7. OO 0063 Programmable Current Source

3.4.7.1. General

3.4.7.2. Specification of the inputs and outputs of the OO 0063

3.4.8. OO 0064 V-I convertor (ADC)

3.4.8.1. General

3.4.8.2. Specification of inputs and outputs

5. CHECKING AND ADJUSTING

5.1. GENERAL

5.2. Adjusting Table

Lists adjustment procedures, elements, and measurement points for calibration.

6 FAULT FINDING

6.1. POWER SUPPLY

Addresses issues related to the instrument's power supply.

6.1.1. No or incorrect power

Troubleshooting steps for power supply problems and incorrect power.

6.2. DISPLAY

Addresses issues related to the instrument's display.

6.2.1. No LED Lighted

Troubleshooting for cases where no LEDs are illuminated.

6.2.2. Only indication LEDs are lighted (+, -, MAN, MO, mva)

6.2.3. Indication LED MAN is not lighted

6.3. ADC

Addresses issues related to the Analog-to-Digital Converter.

6.3.1. Display constant 0000

Troubleshooting for a constant zero display, possibly due to ADC input issues.

6.3.2. Display constant 0 (Overrange)

Troubleshooting for a constant zero display indicating overrange.

6.3.3. Display will nol become zero with shorcircuiled ADC input

Troubleshooting for display not zeroing with a shorted ADC input.

6.3.4. No adjustment of instrument possible, stable display, input voltage supplied lo ADC

Troubleshooting when instrument adjustment is impossible due to stable display.

6.3.6. Unstable display

Troubleshooting for an unstable display output.

6.3.7. ADC not linear

Troubleshooting when the ADC exhibits non-linear behavior.

6.4. V: ATTENUATOR

Addresses issues related to the Voltage Attenuator.

6.4.1. Display cannot be adjusted lo zero

Troubleshooting display zero adjustment issues in the V: attenuator.

6.4.2. Range 1 V:== cannot be adjusted (adj. no. 3, 4, 5.)

Troubleshooting inability to adjust the 1V range of the attenuator.

6.4.3. Range 10 V -_- and 100 V === cannol be adjusted (adj. no. 6, 7)

Troubleshooting inability to adjust 10V and 100V ranges of the attenuator.

6.4.4. V:.- ranges not linear

Troubleshooting non-linear behavior in V:- ranges.

6.5. RANGING

Addresses issues related to the instrument's ranging functions.

6.5.1. No manual ranging

Troubleshooting when manual ranging fails to operate.

6.5.2. No auto ranging

Troubleshooting when the auto-ranging function is inactive.

6.5.3. Incorrect ranging (decimal point incorrect)

Troubleshooting incorrect ranging and decimal point display.

6.6. V- RANGES (ATTN + AC;DC CONV,)

Addresses issues specific to V- ranges including attenuation and AC/DC conversion.

6.6.1. Display constant 0000

Troubleshooting a constant 0000 display in V- ranges.

6.6.2. Display will nol become zero with VQ;O short circuited (Vru lunction)

Troubleshooting display zero issues with VQ/O short circuit in V- function.

6.6.3. Adjustmenls cannot be made (Adj. no. l0)

Troubleshooting when adjustments cannot be performed.

6.6.4. Incorrecl measured va lue

Troubleshooting incorrect measured values in V- ranges.

6.7. A RANGES

Addresses issues related to the Amperage ranges.

6.7.1. Display constant 0000 in range 104

Troubleshooting constant 0000 display in the 10A range.

6.7.2. Range 10 A: cannol be adiusted (Adi. no. 12)

Troubleshooting inability to adjust the 10A range.

6.7.3. Range 100 mA ==_ cannot be adjusted (Adj. no. 19)

Troubleshooting inability to adjust the 100mA range.

6.7.4. Deviation in the measured value

Troubleshooting deviations in measured values across ranges.

6.7.5. 10 Ma range not linear

Troubleshooting non-linear behavior in the 10mA range.

6.8. A;- RANGES

Addresses issues related to the Amperage ranges (likely AC).

6.8.1. Display constant 0000 in range 104

Troubleshooting constant 0000 display in the 10A range.

6.8.2. Range 10 A: cannol be adiusted (Adi. no. 12)

Troubleshooting inability to adjust the 10A range.

6.8.3. Display conslanl zero in range 100 m4

Troubleshooting constant zero display in the 100mA range.

6.8.4. Range 100 mA ==_ cannot be adjusted (Adj. no. 19)

Troubleshooting inability to adjust the 100mA range.

6.9. A.., RANGES

6.9.1. Display constant 0000

6.9.2. Range.loomAtu cannot be adjusled (Adj. no. 19)

6.10. C RANGE

6.10.1. Display constant 0000

6.10.2..C range cannot be adjusted

6.11. RANGE

6.11.1. Incorrect lunctionning

7.3. MODIFICATIONS IN PM2517 E

Philips PM2517X Specifications