Will a Fluke 16 Read Micro Amps

Fluke 116 Specifications

Accuracy Specifications
DC Millivolts	Range: 600.0 mV Resolution: 0.1 mV Accuracy: 0.5 % + 2
DC Volts	Range: 6, threescore, 600 V Resolution: 0.001, 0.01, 0.1 V Accuracy: 0.five % + 2
Car Volts	Range: 600.0 V Resolution: 0.1 V Accuracy: ii.0 % + iii (dc, 45 to 500 Hz) 4.0 % + iii (500 Hz to 1 kHz)
AC millivolts True RMS	Range: 600.0 mV Resolution: 0.ane V Accuracy: 1.0 % + 3 (dc, 45 to 500 Hz) 2.0 % + 3 (500 Hz to 1 kHz)
Ac Volts True RMS	Range: 6, 60, 600 5 Resolution: 0.001, 0.01, 0.ane 5 Accuracy: i.0 % + 3 (dc, 45 to 500 Hz) two.0 % + iii (500 Hz to 1 kHz)
Continuity	Range: 600 Ω Resolution: ane Ω Accuracy: Beeper on <20 Ω off> 250 Ω; detects opens or shorts of 500 µs or longer
Ohms	Range: 600 Ω, vi, 60, 600 kΩ, 6, 40 MΩ Resolution: 1 Ω, 0.001, 0.01, 0.1 kΩ, 0.001, 0.01 MΩ Accurateness: 0.ix % + 1
Diode Exam	Range: 2.000 V Resolution: 0.001 Five Accurateness: 0.9 % + 2
Capacitance	Range: 1000, nF, 10, 100, 9999, 100 to one thousand, >g µF Resolution: 1 nF, 0.01, 0.one, 1 µF Accuracy: 0.ix % + ii, i.9 % + 2, 5 % + 20
Lo-Z Capacitance	Range: i nF to 500µF Accuracy: 10 % + two typical
Temperature (Type-K Thermocouple)	Range: -twoscore to 752 °F (-40 to 400 °C) Resolution: 0.2 °F (0.1°C) Accuracy: 1 % + 18
Air-conditioning µAmps Truthful RMS (45 to 500 Hz)	Range: 600.0 µA Resolution: 0.1 µA Accuracy: 1.five % + 3 (2.5 % + 3 >500 Hz
DC µAmps	Range: 600.0 µA Resolution: 0.one µA Accuracy: 1.0 % + 2
Hz (V or A input)	Range: 99.99, 999.nine Hz, nine.999, 50.00 kHz Resolution: 0.01, 0.1 Hz, 0.001, 0.01 kHz Accuracy: 0.1 % + 2
Full general Specifications
Maximum Voltage Betwixt any Terminal and World Ground	600 V
Brandish	Digital: half dozen,000 counts, updates 4/sec
Bar Graph	33 segments, updates 32/sec
Operating Temperature	14 to 122°F (-ten to 50°C)
Storage Temperature	-twoscore to 140°F (-forty to 60°C)
Battery	9 Five Alkaline metal, NEDA 1604A/IEC 6LR61
Bombardment Life	400 hours typical, without backlight
Surge Protection	6 kV peak per IEC 61010-1 600 5 Cat III, Pollution Degree 2

Click here for complete specifications on the Fluke 116

Multimeter measurements on adjustable speed drives

In the by, motor repair meant dealing with traditional three-phase motor failures that were largely the result of water, dust, grease, failed bearings, misaligned motor shafts, or just plain quondam historic period. But motor repair has changed in a big manner with the introduction of electronically controlled motors, more commonly referred to as adjustable speed drives (ASDs). These drives nowadays a unique set of measurement problems that can vex the most seasoned pro. Cheers to new technology, at present for the first time you can have accurate electrical measurements with a DMM during the installation and maintenance of a drive and diagnose bad components and other conditions that may atomic number 82 to premature failure.

Troubleshooting philosophy

Technicians use many different methods to troubleshoot an electrical circuit, and a good troubleshooter will ever find the trouble - somewhen. The trick is tracking information technology down quickly and keeping downtime to a minimum. The nigh efficient troubleshooting procedure begins at the motor then works systematically back to the electric source, looking for the most obvious problems first. A lot of fourth dimension and coin tin can be wasted replacing perfectly skillful parts when the problem is but a loose connection. Every bit y'all go, have care to take accurate measurements. Nobody takes inaccurate measurements on purpose, but information technology'southward piece of cake to practice, specially when working in a high-energy, noisy environment like an ASD. Too, choosing the correct test tools for troubleshooting the drive, the motor, and the connections are of utmost importance. This is especially true when taking voltage, frequency, and current measurements on the output side of the motor drive. Only until now, there hasn't been a digital multimeter on the market able to accurately measure ASDs. Incorporates a selectable low pass filter* that allows for accurate drive output measurements that concur with the motor drive controller display indicator. Now, technicians won't accept to guess whether the drive is operating correctly and delivering the correct voltage, current, or frequency for a given control setting.

Drive measurements

Input side measurements

Whatsoever good quality True RMS multimeter can verify proper input power to an ASD. The input voltage readings should be inside 1% of 1 some other when measured from phase to phase with no load. A significant unbalance may lead to erratic drive operation and should be corrected when discovered.

Output side measurements

On the flip side, a regular Truthful RMS multimeter can't reliably read the output side of a pulse width modulated (PWM) motor bulldoze, considering the ASD applies pulse width modulated nonsinusoidal voltage to the motor terminals. A Truthful RMS DMM reads the heating upshot of the non-sinusoidal voltage applied to the motor, while the motor controller'due south output voltage reading just displays the RMS value of the primal component (typically from 30 Hz to 60 Hz). The causes of this discrepancy are bandwidth and shielding. Many of today's True RMS digital multimeters have bandwidths out to xx kHz or more than, causing them to respond not only to the fundamental component, which is what the motor responds to simply to all of the high-frequency components generated past the PWM drive. And if the DMM isn't shielded for high-frequency noise, the drive controller's high dissonance levels make the measurement discrepancies fifty-fifty more extreme. With the bandwidth and shielding issues combined, many True RMS meters display readings as much as 20 to xxx% higher than what the bulldoze controller is indicating. The incorporated selectable low pass filter allows troubleshooters to take accurate voltage, current, and frequency measurements on the output side of the bulldoze at either the drive itself or the motor terminals. With the filter selected, the readings for both voltage and frequency (motor speed) should agree with the associated bulldoze control display indications, if available. The low pass filter too allows for authentic current measurements when used with Hall-event type clamps. All of these measurements are particularly helpful when taking measurements at the motor location when the bulldoze's displays are not in view.

Taking prophylactic measurements

Earlier taking whatsoever electrical measurements, be certain you understand how to take them safely. No examination musical instrument is completely rubber if used improperly, and many test instruments are non appropriate for testing adjustable speed drives. Too, make sure to utilize the appropriate personal protective equipment (PPE) for your specific working surroundings and measurements. If at all possible, never work alone.

Rubber ratings for electrical exam equipment

ANSI and the International Electrotechnical Commission (IEC) are the primary independent organizations that ascertain safety standards for exam equipment manufacturers. The IEC 61010 second edition standard for examination equipment prophylactic states two basic parameters: a voltage rating and a measurement category rating. The voltage rating is the maximum continuous working voltage the instrument is capable of measuring. The category ratings draw the measurement environs expected for a given category. Most 3-phase ASD installations would be considered a True cat III measurement environment, with power supplied from either 480V or 600V distribution systems. When using a DMM for measurements on these high-energy systems, make sure it's rated at a minimum for Cat III 600V and preferably for True cat IV 600V/Cat III 1000V. The category rating and voltage limit are typically found on the front panel, at the input terminals. Dual-rated CAT IV 600V and CAT 3 1000V. Refer to the ABC's of DMM Safety* from Fluke for additional data on category ratings and taking rubber measurements.

How to accept measurements

Now permit's put the multimeter to the test. The measurements in the post-obit procedure are designed to be made on a 480 volt three phase drive command at the control console terminal strips. These procedures would also be valid for lower voltage three phase drives powered by either unmarried or three stage supply voltages. For these tests, the motor is running at fifty Hz.

Input voltage

To measure out the air-conditioning voltage supply to the input side of the bulldoze at the drive:

• Select the air-conditioning voltage function.
• Connect the black probe to one of the three phase input terminals. This will be the reference stage.
• Connect the cherry-red probe to one of the other two stage input terminals and record the reading.
• Leaving the black probe on the reference phase now motility the cerise probe to the tertiary phase input and record this reading.
• Make certain in that location's no more than a 1% departure between these two readings.

Input current

Measuring the input current generally requires a current clamp accessory. In most cases, either the input current exceeds the maximum current measurable by the current function, or information technology isn't practical to "break the circuit" to take an in-line series current measurement. Regardless of clench type, insure that all readings are within 10% of each other for proper balance.

Transformer type clamp (i200, 80i-400, 80i-600A)

• Connect the clench to the common and 400 mA input jacks.
• Select the mA/A Air-conditioning role.
• Place the clamp around each of the input supply phase cables in succession, recording each of the readings as they are taken. Since these clamps output i milliamp per amp, the milliamp readings shown on the display are the bodily phase electric current readings in amps.

Hall Result type (AC/DC) clamp (i410,i-1010)

• Connect the clench to the common and V/W input jacks.
• Select the AC voltage office.
• Printing the yellowish button to enable the depression pass filter. This allows the meter to refuse all of the loftier frequency dissonance generated past the drive controller. Once the low pass filter is enabled, the meter volition be in the 600 mV manual range mode.
• Place the clamp effectually each of the input supply phase cables in succession, recording each of the readings every bit they are taken. Since these clamps output i millivolt per amp, the millivolt readings shown on the display are the actual stage current readings in amps.

Figure 1. Output voltage reading without using the low pass filter.

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Figure ii. Output voltage reading with low pass filter enabled.

Output voltage

To measure the Ac output voltage at either the drive or the motor terminals:

• Plug the black examination lead into the common jack and the red test atomic number 82 into the V/Westward jack.
• Select the Air-conditioning voltage office.
• Connect the black probe to one of the three phase output voltage or motor terminals. This volition exist the reference phase.
• Connect the carmine probe to one of the other two stage output voltage or motor terminals.
• Printing the yellow push button to enable the depression pass filter. Now tape the reading.
• Leaving the blackness probe on the reference phase, now move the red probe to the third stage output voltage or motor last and record this reading.
• Make certain that there's no more than than a one% difference between these ii readings (meet Figure 2). The readings should also agree with the controller display, panel if available.
• If the low pass filter isn't enabled, the output voltage readings may exist 10 to 30% higher, as on a regular DMM (see Effigy 1).

Figure 3. Output frequency (motor speed) without the low laissez passer filter.

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Effigy iv. Output frequency (motor speed) using the low pass filter.

Motor speed (Output frequency using voltage every bit a reference)

To determine motor speed, merely take a frequency measurement while using the low pass filter. The measurement tin be made betwixt whatsoever two of the stage voltage or motor terminals.

• Plug the blackness test lead into the mutual jack and the cherry test lead into the V/W jack.
• Select the ac voltage function.
• Connect the black probe to one of the three phase output voltage or motor terminals. This will be the reference phase.
• Connect the reddish probe to ane of the other 2 phase output voltage or motor terminals.
• Press the yellow button to enable the depression pass filter.
• Press the Hz push button. The displayed reading in hertz will be the motor speed (encounter Figure 3). This measurement couldn't be fabricated successfully without the low pass filter (see Figure four).

Output current

TAs with input current, measuring the output current mostly requires a electric current clamp accessory. Over again, regardless of clamp type, insure that all readings are within x% of each other for proper balance.

Transformer type clamp (i200, 80i-400, 80i-600A)

• Connect the clamp to the common and 400 mA input jacks.
• Select the mA/A ac function.
• Identify the clench effectually each of the output phase cables in succession, recording each of the readings as they're taken. Since these clamps output one milliamp per amp, the milliamp readings shown on the display are the actual phase electric current readings in amps.

Figure 5. Output current reading without using the low pass filter.

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Figure six. Output current reading with low pass filter enabled.

Hall Issue blazon (Air conditioning/DC) clamp (i410,i-1010)

• Connect the clamp to the common and V/Due west input jacks.
• Select the ac voltage function.
• Press the yellow push button to enable the low laissez passer filter. This allows the meter to reject all of the high frequency noise generated past the bulldoze controller. One time the depression laissez passer filter is turned on, the meter will be in the 600 mV transmission range way.
• Identify the clamp around each of the output phase cables in succession, recording each of the readings as they are taken (see Figure 6). Since these clamps output 1 millivolt per amp, the millivolt readings shown on the 87-V display are the bodily stage current readings in amps. This measurement would non be possible without the depression pass filter (come across Figure v).

Motor speed (Output frequency using current as a reference)

For motors that pull at least 20 amps of running current, motor speed tin can be determined past taking a frequency measurement with electric current clamps. Until now, noise bug take prevented accurate readings using hall effect type clamps. Here'south how the low pass filter makes it possible.

Motor speed using a Hall Effect type (Air-conditioning/DC) clamp (i410,i-1010)

• Connect the clamp to the common and V/W input jacks.
• Select the ac voltage function.
• Printing the yellowish button to enable the low pass filter. This allows the meter to reject all of the high frequency noise generated by the bulldoze controller. Once the depression pass filter has been turned on, the meter will be in the 600 mV manual range mode.
• Place the clamp around one of the output phase cables. Verify that the multimeter is reading a current of at to the lowest degree twenty amps (xx mV in the display).
• Press the Hz push button. The readings now display the motor speed every bit a frequency measurement.

Motor speed using a transformer type clamp (i200, 80i-400, 80i-600A)

• Connect the clamp to the common and 400 mA input jacks.
• Select the mA/A Air-conditioning function.
• Place the clamp around i of the output phase cables. Verify that the multimeter is reading a electric current of at least 20 amps (20mA in the display).
• Press the Hz button. The readings now display the motor speed every bit a frequency measurement.

DC Jitney measurements

A salubrious dc passenger vehicle is a must for a properly operating motor bulldoze. If the bus voltage is incorrect or unstable, the converter diodes or capacitors may be starting to fail. The DC bus voltage should be approximately 1.414 times the phase to phase input voltage. For a 480 volt input, the DC bus should be approximately 679 VDC. The DC coach is typically labeled as DC+, DC- or B+, Bon the drive terminal strip. To measure the DC bus voltage:

• Select the dc voltage part.
• Connect the black probe to either the DC- or B- terminal.
• Connect the cherry probe to the DC+ or B+ terminal. The bus voltage should hold with the instance mentioned to a higher place and exist relatively stable. To check the amount of ac ripple on the bus, switch the 7V's function switch to the vac function. Some minor drives don't permit external admission to the DC bus measurement without disassembling the drive. If you can't access the DC motorcoach, utilize the top min max function on the multimeter to measure the dc double-decker voltage via the output voltage signal.
• Plug the black exam lead into the common jack and the cherry-red test lead into the V/½ jack.
• Select the Air conditioning voltage part.
• Connect the black probe to one of the iii phase output voltage or motor terminals. This will be the reference stage.
• Connect the red probe to one of the other ii stage output voltage or motor terminals.
• Press the min/max button.
• Press the (Height min/max) push button.
• The displayed reading in Superlative min/max will be the DC motorcoach voltage.

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Source: https://www.fluke-direct.ca/product/fluke-116-hvac-multimeter

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