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Heat-Prober

Platinum-RTD Thermometers User Manual

14.0 700M TROUBLE-SHOOTING AID

14.1 Scope

This section describes basic diagnostics to find the majority of the problems with malfunctioning
700M units.

Equipment Required:

1. Decade Resistance Box

2. 4- Digit DVM, Fluke 8600A or equivalent.

3. Oscilloscope.

4. Power supply, Power/mate BPA-10c or equivalent.

14.2 Procedure

Make certain that the 700M unit experiencing the problem has been properly set-up, per Section
13.0, before proceeding to this section.

Содержание Heat-Prober 392AHP

Страница 1: ...3 Palmer Wahl 234 Old Weaverville Road Asheville NC 28804 Phone 800 421 3131 Fax 828 658 0728 Email info palmerwahl com www palmerwhal com Heat Prober Platinum RTD Thermometers 392AHP 392AM 392AMX 392...

Страница 2: ...ce Wahl agrees to repair or replace any product which upon examination is revealed to have been defective due to faulty workmanship or material if returned to our factory transportation charges prepai...

Страница 3: ...392MX 392VX 392E 392EX 392EVX 392HP Platinum Meters 11 5 0 MAINTENANCE REPAIR 13 6 0 SETUP AND CALIBRATION 15 6 1 Equipment Needed 15 6 2 Voltage Regulator Adjustment 15 6 3 Low Battery Adjustment an...

Страница 4: ...ram Flow 24 10 0 392M TROUBLE SHOOTING AID 27 10 1 Scope 27 10 2 Procedure 27 11 0 ACCESSORIES 30 12 0 CALIBRATION SERVICE 31 13 0 THERMISTOR 01 C RESOLUTION HEAT PROBER 700M 32 13 1 General Discussio...

Страница 5: ...on as well as concurrent battery charging is possible by utilizing the recharger The instrument contains as a standard the unique Wahl Maxi Temp digital peak hold circuit which gives the user the opti...

Страница 6: ...degree C or F resolution When returning from higher temperatures to below 190 C or 375 F the instrument will automatically begin to read in 0 1 increments again 2 2 Automatic Polarity When the tempera...

Страница 7: ...Heat Prober Platinum RTD Thermometers User Manual 7 Figure 2 2 9V Battery Compartment top picture Rechargeable Battery Pack Compartment bottom picture...

Страница 8: ...echarging To recharge the batteries use the recharger supplied Plug in directly to 115VAC 60 cycle wall plug and insert jack into socket on left side of Heat Prober For overseas 220 volt lines use a F...

Страница 9: ...to 100 94 Ohms at 0 C to compensate for variations in different probe configurations This guarantees probe interchangeability at 0 C In addition each probe is tested at a minimum of one higher tempera...

Страница 10: ...rin which a Thermally isolates the hand from the probe preventing hand heat from reaching the sensor and sensor heat in the case of high temperature measurement from burning the hand b Electrically is...

Страница 11: ...k Hold Microcomputer calculated switch to P to activate Ambient Operating Range 0 to 130 F 18 to 55 C Temperature Coefficient 0 01 deg deg over ambient range Power 11681 1 6 25 V NiCad Battery 9V Alka...

Страница 12: ...er calculated switch to P to activate Ambient Operating Range 0 to 130 F 18 to 55 C Temperature Coefficient 0 01 deg deg over ambient range Power 11681 1 6 25 V NiCad Battery 9V Alkaline battery NEDA...

Страница 13: ...ment to determine whether a problem is in the probe or the meter If the meter checks on all 5 calibration points within tolerance for example then one will know that the probes are at fault The most c...

Страница 14: ...Heat Prober Platinum RTD Thermometers User Manual 14 Figure 5 1 392M Platinum Heat Prober with Wahl Calibrator Model Number CAL392HT...

Страница 15: ...ottom of the case then remove the top cover You will note the adjustment points as shown in Figure 6 1 1 Initially the 392M should be set up with an external power supply rather than a battery so that...

Страница 16: ...is on indicating a low battery Now raise the voltage back up until the small L or Lo Bat turns off The voltage at which this happens should be from 5 50 to 5 55 volts Under normal operation an additi...

Страница 17: ...ibration A coiled cord cable with connector for the Wahl probe should be used Model Number 10434 01 This has an approximate resistance of 0 36 ohms The actual resistance should be determined for your...

Страница 18: ...the calibrator decade box to the position or resistance that represents a lower temperature and verify that the peak temperature of Step 1 is held NOTE This is a digital peak that is computed by the p...

Страница 19: ...User Manual 19 Use the Circuit Board Diagrams on these pages to locate potentiometer placement of Zero Adjustment and Span Adjustment Note that placement varies with Model See page 28 for Model 700M B...

Страница 20: ...Heat Prober Platinum RTD Thermometers User Manual 20 Models 392MX 392MVX 392EX and 392EVX...

Страница 21: ...s to be displayed it indicates that an incorrect adjustment is being attempted or a faulty meter 7 0 THERMAL CALIBRATION PROCEDURE For thermal calibration of temperature baths are needed for immersion...

Страница 22: ...hieved as follows The probe is tested at a specific bath temperature and a decade box is attached where the R33 resistor would be in the probe The resistance is adjusted until the 392HP reads the prec...

Страница 23: ...nce the last time the unit was turned on Switch Position HP 4 Cold Peak Hold Continuous display of the coldest temperature since the last time the unit was turned on Switch Position CP If either the c...

Страница 24: ...bsequent readings of the probe resistance Probe and Gaincheck readings are maintained in a Moving Average M A fashion to minimize the effects of random variations Gaincheck readings following Initiali...

Страница 25: ...r Manual 25 Main Program Platinum Heat Prober 392M Figure 9 1 Flow Chart Display Temperature Lookup Temperature Range Check Compensate As Required Get Probe Reading Evaluate Compensation Circuits Powe...

Страница 26: ...ndition is displayed OL If the reading is lower than about 370 degrees the unit downranges Any of these conditions cause the program to return to get a new probe reading with instructions that the mov...

Страница 27: ...r CAL392 HT 2 4 Digit DVM Fluke 8600A or equivalent 3 Oscilloscope 4 Power supply Power mate BPA 10c or equivalent 10 2 Procedure Make certain that the 392 unit experiencing the problem has been prope...

Страница 28: ...5 to Q4 C 5 Check voltage on junction of R30 and CR5 cathode Should be 5 000 005V Proceed to next step Go to Step 8 6 Check voltage on junction of R30 and Q4 base It should be between 4 7 and 4 9 volt...

Страница 29: ...and CR7 Also check wires from connector to circuit board U3 4 should be 660 to 710V U3 14 should be 017 to 079V U3 15 should be 580 to 620V Proceed to next step Replace U3 and if problem is not correc...

Страница 30: ...ng Case Watertight Auto Air Purge Foam lined Locking 18 1 x 12 9 x 4 0 Max Probe 12 12423 05 Carrying Case Crush proof Watertight Manual Air Purge Foam lined Locking 12 0 x 9 0 x 4 0 Max Probe 8 12423...

Страница 31: ...135 97 140 18 144 38 148 57 152 74 156 90 161 04 165 17 169 28 173 28 177 47 400 177 47 181 54 185 60 189 64 193 67 197 69 201 69 205 68 209 65 213 61 217 55 600 217 55 221 49 225 40 229 31 233 20 237...

Страница 32: ...ent are controlled by the microprocessor including the drive for the display and peak reading computation and retention Another important feature of the instrument is the use of dual power regulators...

Страница 33: ...Heat Prober Platinum RTD Thermometers User Manual 33 Figure 13 1 700M Circuit Board Layout...

Страница 34: ...5 for a DVM reading of 2 110 002 volts This sets the low battery indication point at a battery voltage of 5 5 Volts 2 Connect the decade resistance box to the unit to be calibrated by using a cable le...

Страница 35: ...ajority of the problems with malfunctioning 700M units Equipment Required 1 Decade Resistance Box 2 4 Digit DVM Fluke 8600A or equivalent 3 Oscilloscope 4 Power supply Power mate BPA 10c or equivalent...

Страница 36: ...step Go to Step 7 5 Check U4 25 with a scope It should be a 3 58MHz square wave with levels from 0 to 5 volts Replace U6 If still exists go to Step 19 Replace U4 If still no dis play go to next step...

Страница 37: ...U2 5 It should be 0 578V 0 005V Replace U2 Proceed to next step 16 Check voltage at wire harness at pin 3 on circuit board It should be 0 460V 0 005V Proceed to next step Go to Step 19 17 Check voltag...

Страница 38: ...erchandise Authorization number RMA before returning your instrument to the factory For calibration service or technical support contact Palmer Wahl 234 Old Weaverville Road Asheville NC 28804 Ph 800...

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