Valhalla Scientific Inc
4100 Series Digital u-Ohmmeter Specifications
4100ATC | 4150ATC | 4165 | 4165-1344
General
The specifications for the 4100 Series of Ohmmeters are listed in the following paragraphs. In all
cases the specifications are valid for full Kelvin Four-Terminal measurements using connections
having less than 20 milliohms of lead resistance per wire.
Accuracy
The accuracy specifications listed below are valid following a 30 minute warm-up at an ambient
temperature between 15°C and 35°C for a period of 1 year following calibration, and include the
effects of line voltage variations within the allowed range.
Model 4100ATC
Range Maximum Input Resolution Test Current Accuracy
.2Ω .19999 Ω 10µΩ 1 A ±0.02% of rdg ±2 digits
2Ω 1.9999 Ω 100µΩ 100 mA ±0.02% of rdg ±2 digits
20Ω 19.999 Ω 1mΩ 10 mA ±0.02% of rdg ±2 digits
200Ω 199.99 Ω 10mΩ 1 mA ±0.02% of rdg ±2 digits
2kΩ 1.9999 kΩ 100mΩ 100 µA ±0.02% of rdg ±2 digits
20kΩ 19.999 kΩ 1Ω 10 µA ±0.02% of rdg ±2 digits
Full Scale Test Voltage: 200mV
Model 4150ATC
Range Maximum Input Resolution Test Current Accuracy
20mΩ 19.999 mΩ 1µΩ 1 A ±0.03% of rdg ±3 digits
200mΩ 199.99 mΩ 10µΩ 100 mA ±0.03% of rdg ±3 digits
2Ω 1.9999 Ω 100µΩ 10 mA ±0.03% of rdg ±3 digits
20Ω 19.999 Ω 1mΩ 1 mA ±0.03% of rdg ±3 digits
200Ω 199.99 Ω 10mΩ 100 µA ±0.03% of rdg ±3 digits
2KΩ 1.9999 kΩ 100mΩ 10µA ±0.03% of rdg ±3 digits
Full Scale Test Voltage: 20mV
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Model 4165
Range Maximum Input Resolution Test Current
[1]
Accuracy
.2Ω .19999 Ω 10µΩ 100 mA ±0.03% of rdg ±3 digits
2Ω 1.9999 Ω 100µΩ 10 mA ±0.03% of rdg ±3 digits
20Ω 19.999 Ω 1mΩ 1 mA ±0.03% of rdg ±3 digits
200Ω 199.99 Ω 10mΩ 100 µA ±0.03% of rdg ±3 digits
2kΩ 1.9999 kΩ 100mΩ 10 µA ±0.03% of rdg ±3 digits
20kΩ 19.999 kΩ 1Ω 1 µA ±0.03% of rdg ±3 digits
Full Scale Test Voltage: 20mV
[1] The Model 4165 uses reduced test currents and incorporates a user-selectable clamp on the
current source for making "dry" measurements. The clamp may be set to 50mV or 2V.
Model 4165-1344
Range Maximum Input
[2]
Resolution Test Current
[1]
Accuracy
.2Ω .19999 Ω 10µΩ 100 mA ±0.03% of rdg ±3 digits
2Ω 1.9999 Ω 100µΩ 10 mA ±0.03% of rdg ±3 digits
20Ω 19.999 Ω 1mΩ 1 mA ±0.03% of rdg ±3 digits
200Ω 199.99 Ω 10mΩ 100 µA ±0.03% of rdg ±3 digits
2kΩ 1.9999 kΩ 100mΩ 10 µA ±0.03% of rdg ±3 digits
20kΩ 19.999 kΩ 1Ω 1 µA ±0.03% of rdg ±3 digits
Full Scale Test Voltage: 20mV
[1] The Model 4165-1344 uses reduced test currents and incorporates a user-selectable clamp on
the current source for making "dry" measurements. The clamp may be set to 20mV or 2V. The
4165-1344 also has a reverse current mode that may be used to ensure a dry, true-ohms
measurement.
[2] If the clamp is set to "20mV", the Maximum Input specification is changed to: 20% of range
for the .2Ω range or 50% of range for all other ranges.
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General Specifications
Display Type: ............................................................................................4½ digit LED (20000 counts)
A-to-D Conversion Rate:.............................................................................................. 400 milliseconds
ATC Mode (4100 and 4150 only):................................... Add ±0.05% + 0.001%/°C to accuracy spec
Compensator Accuracy: ............................................................±0.1% of rated temperature coefficient
Overrange: ............................................................................. 100% of range (19999 counts on display)
Overrange Indication: ...................................................................................................... Display flashes
Terminal Configuration: ...............................................................................................Four-wire Kelvin
Temperature Coefficient:............................................................... ±0.002% /°C (0-15°C and 35-50°C)
Test Current Polarity: ...................................Negative (flows Low to High). 4165-1344 is selectable.
Test Current Compliance Voltage (4100,4150): ......................................................... 5 volts minimum
Test Current Compliance Voltage (4165):...............................selectable clamp at 50mV or 2V (±5%)
Test Current Compliance Voltage (4165-1344): .....................selectable clamp at 20mV or 2V (±5%)
Settling Time:........................................................... 300 milliseconds + 1 conversion to within ±0.1%
Environmental Requirements
Common Mode Rejection Ratio: .......................................................................... 60 db at DC to 60Hz.
Power Supply: ......................................... 115VAC or 230VAC ±10% @ 50Hz to 400Hz; 25VA max
Operating Temperature Range: ............................................................................................ 0°C to 50°C
Storage Temperature Range: .......................................................................................... -40°C to +85°C
Humidity:................................................................................ 80% RH max. at 40°C (non-condensing)
Dimensions: ........................................................................ 15"(38cm)W x 10"(26cm)D x 3½"(9cm)H
Dimensions (serial# 8-3637 and higher):......................17"(43cm)W x 11½"(29.5cm)D x 4"(10cm)H
Weights:...................................................................................11lbs(5kg) NET; 15lbs(7kg) SHIPPING
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Weights (serial# 8-3637 and higher):...............................12lbs(5.5kg) NET; 16lbs(7.5kg) SHIPPING
Recommended Calibration Intervals
The above accuracy specifications are valid for a period of 1 year following calibration, thus for
maintenance of these specifications a calibration interval of 1 year is recommended. More frequent
calibrations may be performed as desired.
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