1251/1351Micropots

Model 1251/1351Micropotentiometers

Product Summary

The BLI Series of Micropotentiometers consist of a Model 1251 terminating resistor and a Model 1351 Thermoelement housing. These micropots are true RMS current to voltage converters for calibrating AC instruments. The NIST calibration range is from dc to 500 MHz (available to 1.2 GHz)

Product Features

	Precision low-level AC Generator
	Can be used as primary standard
	UHF Thermocouple
	Usable from DC to 1.2 GHz

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Product Specifications

Radial Resistors:

Available in nominal values from 0.5 to 22 ohms with a ± 30% tolerance. Each resistor is supplied soldered in a Type N female coaxial connector.

Housings:

Normally supplied with either a 5, 10 or 15 mA UHF type thermocouple. Higher thermocouple ratings are available on request. Heater to thermocouple voltage must not exceed + 50 V dc or peak ac. Heater current is limited to 150% of rating.

Voltage Range:

800 microvolts to 1.4 volts dependent on combination of radial resistor and thermocouple selected. Each combination will have a nominal output voltage equal to the product of resistance and rated thermocouple current, and can be varied from 1/3 to 1-1/3 of this nominal output.

Outputs greater than 1.4 volts can be obtained by using higher thermocouple ratings.

Frequency:

DC to 1.2 GHz

DC Reversal:

The dc reversal error of the standard thermoelement is nominally ± 0.2%. Thermoelements with a dc reversal error of ± 0.005 (5 mA only) can be supplied on special request.

Uncertainty of AC-DC Difference Calibration (ppm)

Range	20 Hz - 50 Hz	20 kHz	50 kHz	100 kHz	1 MHz
100 mV	40	30	50	100	250
30 mV	60	60	70	150	300
10 mV	80	80	100	200	400
3 mV	120	120	150	250	450
1 mV	200	200	250	300	500

Uncertainty of RF-DC Difference Calibration (%)

Range	Connector	5	30	50	70	100	300	400	500	700	900	1000	MHz
1mV-2.2 V	N Female	0.2	---	---	---	1.2	1.2	1.2	1.2	1.2	1.2	1.3	Uncertainty

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Product Ordering Information

Model	Description	Order
1251-xx	Terminating Resistors, Reduced Correction Factors: 0.5, 1.0, 1.28, 1.5, 2.2, 2.8, 3.3, 4.7, 6.8, 10, 15, 20, and 22 ohm. ± 30%.	Domestic Price--$625.00 [Order] [Checkout] select resistor value at order entry
1351-xx	Thermoelement housing for 1251. Resistor values: 2.5 mA, 5 mA, 10 mA, 15 mA, 25 mA, 50 mA and 100 mA.	Domestic Price--$695.00 [Order] [Checkout] select value at order
*Options*
-09	Additional data points at 700 and 900 MHz, 1251-xx only.	Domestic Price--$195.00 [Order] [Checkout]
-10	±0.005% DC Reversal Error, 1351-05 Only	Domestic Price--$445.00 [Order] [Checkout]
-12	3 Pin Military Connector	Domestic Price--$145.00 [Order] [Checkout]
*Accessories*
51-10073-1	Storage Case for µPots.

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Model 1251/1351Micropotentiometers

Product Summary

Product Features

Product Specifications

Housings:

Voltage Range:

Frequency:

DC Reversal:

Uncertainty of AC-DC Difference Calibration (ppm)

Uncertainty of RF-DC Difference Calibration (%)

Product Ordering Information

Revised: December 29, 2006.