NVIS 61T Manual de usuario
Nvis 61T
2
Dual Display Multimeter
Nvis 61T
1. Safety Instructions 3
2. Introduction 4
3. Features 4
4. Technical Specifications 5
5. Front Panel Control 10
6. Operating Instruction 17
7. Maintenance 29
8. Warranty 33
Nvis 61T
3
Safety Instructions
Read the following safety instructions carefully before operating the instrument. To
avoid any personal injury or damage to the instrument or any product connected to it.
Do not operate the instrument if suspect any damage within.
The instrument should be serviced by qualified personnel only.
For your safety:
Use proper Mains cord : Use only the mains cord designed for this instrument.
Ensure that the mains cord is suitable for your
country.
Ground the Instrument : This instrument is grounded through the protective
earth conductor of the mains cord. To avoid electric
shock the grounding conductor must be connected to
the earth ground. Before making connections to the
input terminals, ensure that the instrument is properly
grounded.
Observe Terminal Ratings : To avoid fire or shock hazards, observe all ratings and
marks on the instrument.
Use only the proper Fuse : Use the fuse type and rating specified for this
instrument.
Use in proper Atmosphere : Please refer to operating conditions given in the
manual.
1. Do not operate in wet/damp conditions.
2. Do not operate in an explosive atmosphere.
3. Keep the product dust free, clean and dry.
Nvis 61T
4
Introduction
Nvis 61T is a compact ready to use Dual Display Multimeter. This is useful for
measuring voltage, current, resistances, or frequency. It is also used for testing the
diode & continuity. The Dual Display Multimeter has 5-digit high resolution mode.
The meter is designed for bench-top.
Features
A dual, Liquid Crystal Display that allows two properties of an input signal
to be displayed at the same time.
True rms AC.
Frequency measurement (volts AC Function) to greater than 300 KHz.
10µV sensitivity in volts DC.
Decibels with variable reference impedance measurement capability.
A compare mode to determine if a measurement is within, above, or below
a designated range.
Slow and Fast selectable count resolution with reading speeds of 3 and 6
reading per second respectively.
Built-in self-tests with closed-case calibration (no internal calibration
adjustment).
Nvis 61T
5
Technical Specifications
This Section contains the specifications of Dual Display Multimeter.
These specifications assume:
Reading Rates:
Rate
Reading per second
Slow(S)
3
Fast(F)
5~7
DC Voltage:
Range
Resolution
Accuracy
300mV
3V
30V
300V
1000V
10µV
100µV
1mV
10mV
100mV
0.03%+3
Input Impedance : 1000MΩ at 300mV and 3V. 10MΩat other ranges.
Normal Mode Rejection : ≥60dB (at 50Hz or 60Hz)
Ratio (NMR)
Common Mode Rejection : ≥120dB (at 50Hz or 60Hz)
Ratio (CMR)
Maximum Input : 1000V peak
Nvis 61T
6
True RMS AC Voltage, AC-Coupled:
Range
Resolution
Accuracy
20-50Hz
50Hz~10K
Hz
10-
20KHz
20-
30KHz
30-
50KHz
300mV
10µV
3V
100µV
2%+30
0.5%30
1%+80
5%+80
10%+15
0
30V
1mV
3%+30
1%+50
5%+50
10%+50
300V
10mV
750V
100mV
1%+30
Remark : Accuracy specifications apply to the range from 10%
to 100%
Input Impedance : 1MΩ in parallel with 0.1µF
Maximum Crest Factor : 3.0
Common Mode Rejection : >120dB at 50Hz or 60Hz (1KΩ
Ratio unbalanced resistance)
Maximum Input : 750Vrms, 1000V peak.
DC Current:
Range
Resolution
Accuracy
Input Impedance
300mA
10µV
0.1%+3
1
10A
1mA
0.5%+3
0.01
Maximum Input:
300mA, Protected with a 500mA, 250V fast blow fuse; 10A for 30 seconds
maximum. Protected with 11A, 250V fast blow fuse.
Nvis 61T
7
True RMS AC Voltage, AC-Coupled:
Range
Resolution
Accuracy
20-50Hz
50Hz~2K
Hz
2-10-
KHz
10~20KHz
20~0
KHz
300m
A
10µA
2%+3
0.5%+30
1%+80
5%+
50
10A
1mA
1.5%
3%+30
Indicates that the range for frequency between 2.5 KHz
Maximum Input:
300mA. Protected with a 500mA, 250V fast blow fuse; 10A for 30 seconds
maximum. Protected with 11A, 250V fast blow fuse.
Maximum Crest Factor:
Ohm:
Range
Resolution
Accuracy
Open Circuit
Voltage
Short
Circuit
Current
300
10M
0.05%+3
2.5V
About 1mA
3K
100M
About
250µA
30K
1
300K
10
About 25µA
3M
100
0.1%+3
About0.
2.5µA
30M
1K
0.5%+3
About0.
25µA
Nvis 61T
8
Maximum Input Voltage : 250V dc or rms ac on all ranges
Diode Test/Continuity
Maximum Test Voltage : ≤2V
Test Current
Approximate 1mA when measuring forward bias junction.
Continuous Resistance : ≤150Ω
Frequency:
Range
Resolution
Accuracy
0.5%+2
300Hz
0.01Hz
3KHz
0.1Hz
30KHz
1Hz
300KHz
10Hz
Frequency Range : 10Hz to 300 KHz
Applicable Function : Volts AC
Sensitivity of AC Voltage:
Frequency
Level (sine wave)
10Hz~30KHz
>30mV
10Hz~300KHz
>300mV
Environmental:
Temperature Coefficient : <0.1 times the applicable accuracy specification per
degree C for 5°C to 18°C and 28°C to 40°C.
Operating Temperature : 5°C to 40°C
Storage Temperature - :25°C to 50°C
Relative Humidity : ≤90% at 5°C to 28°C (non-condensing)
≤80% at 28°C to 40°C ≤70% at 10°C to 40°C for the
300KΩ, 3MΩ and 30MΩ ranges.
Nvis 61T
9
General
Common Mode Voltage : 1000V dc or peak ac maximum from any input to earth
Size : 245mm deep, 220mm wide, 82mm high
Weight : about 2Kg
Power : about 5VA
Calibration cycle : 1 year
Warm-up time : One-hour
Reading rate : Slow
Relative humidity : Not exceeding 70% (non condensing)
Accuracy : Expressed as ± (Percentage of reading +
Digits)
Nvis 61T
10
Front Panel Description
The section explains how to prepare the meter for operation, discusses general
operating features, and walks you through the basics of taking some common
measurements.
Unpacking and Inspecting the Meter:
Carefully remove the meter from its shipping container and inspect it for possible
damage or missing items. If the meter is damaged or something is missing, contact the
place of purchase immediately. Save the container and packing material in case you
have to return the meter.
Front Panel and Rear Panel:
The front panel (shown in Figure1) has three main elements: the input terminals on
the right, the display and the pushbuttons. The push buttons are used to select major
functions, ranging operations, and function modifiers. These elements are described in
detail in Section 3.
Front Panel Figure 1
The rear panel (shown in Figure2) contains the power-line cord connector the Serial
Number Label.
Real Panel Figure 2
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