1. Introduktion
The Fluke 789 ProcessMeter is a versatile maintenance and calibration tool designed for instrumentation technicians. It integrates the capabilities of a Digital Multimeter (DMM) with a loop calibrator into a single, rugged, handheld device. This instrument allows for the measurement, sourcing, and simulation of 4-20 mA DC loop current signals with high accuracy, and includes a built-in 24 V loop supply.
2. Sikkerhedsoplysninger
Always adhere to safety precautions when operating the Fluke 789 ProcessMeter. This device is designed to protect users in high-voltage, high-current environments. Failure to follow safety guidelines can result in serious injury or damage to the equipment.
- Overbelastningsbeskyttelse: The device features 1000V overload protection on V, Ohms, and frequency functions, and 150V overload protection on mA, backed by a 440 mA 1000V fuse.
- Sikkerhedsstandarder: The Fluke 789 meets 1000V EN61010-1 CAT III standards and 600V EN61010-1 CAT IV standards.
- Fysisk holdbarhed: The unit has passed a one-meter drop test, indicating its robust construction.
- Batterisikkerhed: Ensure correct battery polarity and use only specified battery types. Replace batteries in a safe environment.
3. Hvad er der i æsken
Upon unpacking your Fluke 789 ProcessMeter, verify that all the following items are included:
- Fluke 789 ProcessMeter
- 1 Set of AC175 Alligator Clips
- 1 Set of TL71 Test Lead Set
- 4 AA 1.5 V Alkaline Batteries (installed)
- Hurtig referencevejledning
4. Produktet er slutview
The Fluke 789 ProcessMeter combines a digital multimeter with a loop calibrator. Below is an overview of its key features and components.
Billedbeskrivelse: En front view of the Fluke 789 ProcessMeter, highlighting its main features with numbered callouts. The yellow device has a large digital display showing '8.000 mA DC' and '25.0 % LOOP POWER HART'. A rotary dial is central, surrounded by various function buttons. Test lead inputs are at the bottom. The numbered callouts point to: 1. Full multimeter capabilities, 2. Wireless communication (implied by Fluke Connect logo), 3. Full 4-20 mA troubleshooting, 4. mA Auto ramping and stepping, 5. Built-in HART resistor, 6. Integrated 24 V loop power, 7. Safety rated.
Billedbeskrivelse: A clear, detailed front view of the Fluke 789 ProcessMeter. The device is yellow with a grey display and black buttons and rotary switch. The display shows '8.000 mA DC' and '25.0 % LOOP POWER HART'. The rotary switch is set to the 'OFF' position. Various buttons for functions like '100% SpanCheck', 'MIN MAX', 'RANGE', 'HOLD', '0%', '%STEP', 'COARSE', 'FINE', 'REL Δ', and 'Hz' are visible. Input jacks are at the bottom.
Nøglekomponenter:
- Large Dual Display: Features enhanced backlight with two brightness settings for clear readings.
- Drejekontakt: Selects measurement and output functions.
- Funktionsknapper: Control specific features like range, hold, min/max, step, and ramp.
- Indgangsstik: For connecting test leads for various measurements.
- Udgangsstik: For sourcing and simulating current.
5. Opsætning
Installation af batteri
The Fluke 789 ProcessMeter operates on four AA 1.5V alkaline batteries, which are included and pre-installed. The battery compartment is externally accessible for easy changes.
- Sørg for, at enheden er slukket.
- Find batteridækslet på bagsiden af enheden.
- Use a Torx driver to loosen the screws securing the battery cover.
- Remove the cover and replace the old batteries with new AA 1.5V alkaline batteries, observing correct polarity.
- Securely reattach the battery cover and tighten the screws.
Tilslutning af prøveledninger
Connect the supplied TL71 Test Lead Set and AC175 Alligator Clips to the appropriate input jacks at the bottom of the ProcessMeter for your desired measurement or output function.
6. Betjeningsvejledning
The Fluke 789 ProcessMeter offers a wide range of functions for electrical measurement and process loop calibration. Always refer to the quick reference guide for detailed operational steps for specific tasks.
Generel drift
- Tænd/sluk: Rotate the central switch from 'OFF' to the desired function to power on the device. Return to 'OFF' to power off.
- Baggrundsbelysning: Press the backlight button (sun icon) to adjust display brightness.
- Hold funktion: Tryk på 'HOLD'-knappen for at fryse den aktuelle displayvisning. Tryk igen for at slippe.
- Min/Max: Press 'MIN MAX' to record minimum and maximum values over time.
DMM Capabilities
The 789 ProcessMeter includes standard DMM functions:
- Voltage (AC/DC) measurement
- Modstandsmåling
- Frekvensmåling
- Kontinuitets- og diodetest
4-20 mA Loop Calibration
The device excels in measuring, sourcing, and simulating 4-20 mA signals.
- Aktuelt måleområde: 0 to 30 mA DC.
- Sourcing/Simulating: Provides 0.05% accuracy and 1 microamp resolution for DC loop current.
- 24V Loop Power Supply: Built-in supply reduces the need for external power when testing transmitters offline.
- HART Resistor: Includes a built-in, selectable 250-Ohm HART resistor.
- mA Output Control: Features 25% Manual Step, Auto Step, and Auto Ramp funktioner.
- Span Check: Use the '0%' and '100%' buttons to quickly toggle between 4 mA and 20 mA sourcing for a rapid span check.
7. Vedligeholdelse
Proper maintenance ensures the longevity and accuracy of your Fluke 789 ProcessMeter.
Rensning
- Tør sagen af med annonceamp klud og mildt rengøringsmiddel. Brug ikke slibemidler eller opløsningsmidler.
- Clean the input jacks periodically to prevent poor connections.
Udskiftning af batteri
Refer to the 'Battery Installation' section under 'Setup' for detailed instructions. Replace batteries when the low battery indicator appears on the display.
Udskiftning af sikring
The 789 ProcessMeter has a 440 mA 1000V fuse for mA input protection. If the mA function stops working, the fuse may need replacement. Fuse replacement should only be performed by qualified personnel following the instructions in the full service manual.
8. Fejlfinding
This section provides solutions to common issues encountered with the Fluke 789 ProcessMeter.
| Problem | Mulig årsag | Løsning |
|---|---|---|
| Måleren tænder ikke | Døde eller forkert installerede batterier | Udskift batterierne, og sørg for korrekt polaritet. |
| No mA reading or output | Blown mA fuse | Replace the mA fuse (refer to Maintenance section). |
| Unøjagtige aflæsninger | Dirty test leads or input jacks; environmental factors | Clean test leads and jacks. Ensure stable operating environment. Consider professional calibration if issues persist. |
| Displayet er svagt eller ulæselig | Low battery; backlight setting | Replace batteries. Adjust backlight brightness using the backlight button. |
9. Specifikationer
Detailed technical specifications for the Fluke 789 ProcessMeter.
| Feature | Specifikation |
|---|---|
| Modelnummer | 789 |
| Dimensioner (H x B x D) | 9.02 x 15.2 x 2.99 tommer |
| Varens vægt | 1.34 pund (600 gram) |
| Strømkilde | Batteridrevet |
| Batterier | 4 AA 1.5V alkaline batteries (included) |
| Typical Battery Life (Measurement) | Cirka 140 timer |
| Typical Battery Life (Sourcing 20 mA) | Cirka 10 timer |
| Nuværende måleområde | 0 til 30 mA DC |
| mA Source Accuracy | 0.05 % |
| mA Source Resolution | 1 mikroamp |
| Sløjfe strømforsyning | 24V |
| HART Resistor | Built-in, selectable 250-Ohm |
| Overload Protection (V, Ohms, Freq) | 1000V |
| Overload Protection (mA) | 150V (440 mA 1000V fuse) |
| Sikkerhedsvurdering | 1000V EN61010-1 CAT III, 600V EN61010-1 CAT IV |
10. Garanti og support
Garantioplysninger
Fluke products are designed for reliability and durability. This product is covered by a manufacturer's warranty. For specific warranty terms and conditions, please refer to the documentation included with your purchase or visit the official Fluke website. Ensure your purchase is from an authorized distributor to guarantee a valid warranty.
Kundesupport
For technical assistance, troubleshooting beyond this manual, or service inquiries, please contact Fluke customer support. Contact information can typically be found on the Fluke website or in the quick reference guide provided with your device.
