B&K Precision 的 2840 Series 规格书

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Data Sheet
DC Resistance Meters
2840 Series
Technical data subject to change
© B&K Precision Corp. 2017 www.bkprecision.com
The 2840 Series DC resistance meters feature
high accuracy and resolution measurements in the
milliohm range. Both meters are ideally suited for
measuring contact resistance of relays, switches,
and PCB traces, typically outside the resistance
range of multimeters. The vivid 4.3-inch TFT LCD
color touch screen and keypad provide intuitive
operation.
The 2841 model adds extended range, accuracy,
temperature measurement and functions. Measure
low resistivity materials with offset voltage
compensation to reduce the influence of thermal
EMF. Cable error detection displays a message
when one of the terminals is open, which helps
identify defective test leads or poor contact that
can cause unreliable measurements.
The 2841 includes two temperature compensation
functions: correction (TC) and conversion (∆t).
The TC function corrects for ambient temperature
changes that cause different resistance
measurements of the same component. The
temperature conversion (∆t) function can be used
to evaluate a coil’s resistance before and after
operation to calculate a temperature change.
These additional features make the 2841 ideal for
evaluating coils, motor windings, transformers,
actuators and conductive materials.
Both meters feature low power resistance testing
(LPR) modes and variable measurement speeds
that are suited for a wide range of applications.
The handler interface with high-speed
measurement capabilities enable the 2840 Series
to evaluate a large quantity of components and be
integrated into an automated test system.
Features & Benefits
n 4.3-inch color touch screen
n 4-wire Kelvin test leads included
n Temperature measurement with correction*
n Low power resistance mode to protect DUT
n Manual or auto ranging
n Adjustable measurement speed for fast readout
or better accuracy
n Fast measurement speed up to 20 ms/reading
to increase manufacturing throughput
n Offset voltage compensation (OVC)*
n Cable compensation (0 ADJ)
n BIN comparator function to sort components
in up to 10* bin locations
n Bin-sorting with statistical measurement
n Store/recall 30 instrument settings
n Screen capture to USB drive
n Selectable power line filter
n Trigger delay
n Handler interface for easy integration with a
component handler
n Standard RS232, USB (USBTMC and virtual
COM), and LAN* interfaces
USB LAN* RS232
Model 2840 2841
Display Range 1 µΩ to 20 kΩ0.1 µΩ to 100 MΩ
Basic Accuracy 0.1% 0.01%
Measurement Resolution 1 µΩ0.1 µΩ
Displayed Digits 4 1/2 5 1/2
Functions R and LPR R, R-T, T, LPR, LPR-T
Resistance Measurement Ranges 7 + Auto 11 + Auto
Temperature Compensation - √
Number of Results Bins 3 10
* model 2841 only
Touch screen to zoom, select, and enter values
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DC Resistance Meters
2840 Series
2www.bkprecision.com
Front panel
Rear panel
Touch screenUSB host port Menu function
keys
Input
terminals
Navigation keys
RS232C
interface
AC line input with
fuse holder
Handler interface LAN interface
Temperature
probe input
Temperature probe
(Included with model 2841 only)
Model 2840
Model 2841
Handler interface
Power On/Off
USB interface
Chassis ground
Intuitive user interface
The touch screen and keys both provide a convenient interface for setting parameters quickly and precisely. Both models also support one touch zoom to enhance
the readability of displayed measurements.
USB interface
Kelvin test leads
(Included with both models)
DC Resistance Meters
2840 Series
3www.bkprecision.com
Powerful features
Bin sorting function
Quickly sort components using the 10 bins of the 2841 or 3 bins of the 2840.
The results can be displayed on the screen or output via the handler interface.
High and low limits for each bin can be set up in absolute or tolerance mode.
Temperature correction
The 2841 can compensate for temperature changes with a component’s known
temperature coefficient of resistivity. This allows for increased comparison
accuracy between components that are measured at different temperatures.
Remote PC control
Integrate your DC resistance meter into an automated test system and control
it from a PC using commands via the RS232 or USB interface. The 2841 is
LAN enabled with a web browser interface that allows users to conveniently
configure, control, or monitor basic settings.
Component testing
Measure the resistance of motor and transformer windings, relay and
switch contacts, and other conductive materials and components. 4-wire
Kelvin test leads included with both models.
Circuit board testing
The resistance meters’ high accuracy make them suitable for measuring
trace resistances and finding shorts on PCBs.
Applications
LPR (Lower Power Resistance) measurement
In standard resistance measurement mode (LPR OFF), the large drive current
(1 A max.) may damage sensitive components or circuits. LPR mode protects
the DUT by limiting the maximum power being applied.
Offset voltage compensation (OVC)
OVC switches the polarity and averages the forward and reverse polarity
readings. This enables accurate measurements by minimizing the adverse
effects of thermal EMFs or small biases in a circuit (e.g., from a capacitor’s
dielectric absorption when measuring a PCB trace).
DC Resistance Meters
2840 Series
4www.bkprecision.com
Model 2841
LPR OFF
Resistance
range 3Current Resolution Accuracy
(rdg% + FS%)
Maximum Open
Terminal Voltage
20 mΩ1 A 0.1 µΩ0.25+0.001 5 V
200 mΩ21 µΩ0.25+0.001
200 mΩ2(selectable)
100 mA 1 µΩ0.35+0.001
2.6 V
2 Ω100 mA 10 µΩ0.035+0.001
20 Ω10 mA 100 µΩ0.025+0.001
200 Ω1 mΩ0.01+0.001
2 kΩ1 mA 10 mΩ0.01+0.001
20 kΩ100 µA 100 mΩ0.01+0.005
100 kΩ1 Ω0.01+0.003
13 V
1 MΩ10 µA 10 Ω0.02+0.001
10 MΩ1 µA 100 Ω0.1+0.006
100 MΩ100 nA 1 kΩ0.8+0.060
LPR ON
2 Ω10 mA 100 µΩ
0.05+0.001 60 mV
20 Ω1 mA 1 mΩ
200 Ω100 µA 10 mΩ
2 kΩ10 µA 100 mΩ
Model 2840
LPR OFF
Resistance
Range Current Resolution Accuracy
(rdg% + digits)1
Maximum Open
Terminal Voltage
20 mΩ1 A 1 µΩ0.1 + 3
0.7 V200 mΩ100 mA 10 µΩ
0.1 + 2
2 Ω100 µΩ
20 Ω10 mA 1 mΩ
3 V
200 Ω1 mA 10 mΩ
2 kΩ100 µA 100 mΩ
20 kΩ1 Ω
LPR ON
2 Ω10 mA 100 µΩ
0.2 + 5 40 mV
20 Ω1 mA 1 mΩ
200 Ω100 µA 10 mΩ
2 kΩ10 µA 100 mΩ
Accuracy = (measurement value x rdg) + (least significant digit)
1 - Test speed set to Slow2
Specifications
Specifications are valid after temperature stabilization period of 15 minutes over an
ambient temperature range of 23 °C ± 5 °C.
Resistance Measurements
Pt500
Temperature range Resolution Accuracy in six months Accuracy in one year
-10.0 °C to 39.9 °C 0.1 °C ±0.30%rdg ± 0.5 °C ±0.45%rdg ± 0.8 °C
40.0 °C to 99.9 °C 0.1 °C ±0.30%rdg ± 1.0 °C ±0.45%rdg ± 1.5 °C
Analog Input
Input voltage range Temperature range display Resolution Accuracy
0 to 2 V -99.9 °C to 999.9 °C 1 mV ±1% TR ± 3 mV
Accuracy = (measurement value x rdg%) + (resistance range x FS%)
2 - Current for the 200 mΩ range can be selected in the measurement setup menu.
3 - Measurement display is 5 1/2 digits for ranges 20 mΩ to 20 kΩ, 5 digits for ranges 100 kΩ
to 100 MΩ
Accuracy = 1% x (TR – T0V) + 0.3% x (T1V - T0V)
T1V: The temperature measured under input voltage of 1 V.
T0V: The temperature measured under input voltage of 0 V.
TR: The current measured temperature.
Temperature Measurements (Model 2841 only)
Accuracy = 0.3% x measured value ± 0.5 ºC
DC Resistance Meters
2840 Series
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v081517
Specifications
Model 2840 2841
Measurement Function
Resistance
Measurement
Time (typical)1
FAST 10 ms 7 ms
MED 25 ms 22 ms
SLOW1 115 ms 102 ms
SLOW2 455 ms 402 ms
Temperature Measurement Time - 100 ± 10 ms
Measuring Terminals 4 terminals
Averaging 1 to 255
Range Mode Auto and Manual
Trigger Mode Internal, Manual, External, Bus
mR + b Mode Apply a multiplier (m) and offset (b) to the measurement (R). (2841 model only)
LPR Mode Ranges 20 Ω, 200 Ω, 2 kΩ, maximum open terminal voltage: 60 mV
Statistical Measurement Function AVG, MAX, MIN, OSD (Overall standard deviation), SSD (Sample standard deviation), Process capacity index (Cp, Cpk)
Comparator (bin sorting) Function
Comparator
Signal output IN, HI, LO
Beep mode OFF, IN, HI, LO
Limit setup mode Absolute value high/low limit, Percentage high/low limit + nominal value
Bin Sorting 3 bins, absolute value/percentage 10 bins, absolute value/percentage
General
AC input
Voltage 110 VAC 220 VAC 110 to 240 VAC ± 10 %
Frequency 60 Hz 50 Hz 50 to 60 Hz
Power Consumption < 30 VA
Display 4.3”, 480 x 272 TFT Color (24-bit) LCD touch screen
Remote Interface USB (USBTMC or virtual COM), RS232 USB (USBTMC or virtual COM), RS232, LAN
Handler Interface 9-pin connector 50-pin connector
Storage Memory Save/recall 30 instrument settings
Operating Temperature 0 °C to 40 °C, ≤ 80% RH
Storage Temperature 5 °C to 40 °C, ≤ 85% RH
Dimensions (W x H x D) 8.46” x 3.5” x 14.17” (215 mm × 89 mm × 360 mm)
Weight 8.6 lbs (3.9 kg) 6.45 lbs (2.92 kg)
Three-Year Warranty
Included Accessories AC power cord, user manual (downloadable), Kelvin test leads (TLDK1), temperature probe TPTC2 (model 2841 only), test
report and certificate of calibration
1 - When DISPLAY is OFF; when DISPLAY is ON, 20 ms should be added.