MTC-1

Precision Volt-Second Generator

When the optimum performance of a measurement instrument is required, that instrument must be periodically calibrated to a traceable standard. This standard must provide a calibration accuracy which exceeds the intrinsic accuracy of the measurement instrument by a comfortable margin. A margin broad enough so as not to unduly influence the overall calibrated accuracy of that instrument.

The MTC-1 Volt-Second Generator is a precision traceable standard with 11 impulse outputs from 0.0001 V-S to 10 V-S, which corresponds to a range of 104 to 109 maxwell-turns, and has an overall instrument accuracy which is better than ±0.05%.

Used as a primary standard to calibrate fluxmeters, electronic integrators and ballistic galvonometers without recourse to standard search coils or reference magnets, the MTC-1 will calibrate a quality fluxmeter precisely enough to allow the fluxmeter to be used as a secondary standard for calibration of search coils, reference magnets, Hall probes and gaussmeters.

Features
  • Trackable Accuracy: ±0.05%, NIST Traceability
  • Broad Range: 0.0001 to 10 Volt-Seconds; 104 to 109 Maxwell-Turns
  • Stand Alone Calibration: Without recourse to search coils or reference magnets
  • Direct Calibration: Fluxmeters, Electronic Integrators, Ballistic Galvanometers
  • Indirect Calibration: Gaussmeters, Hall-probes, Search Coils, Reference Magnets
  • Convenient Scaling: Scaled to read Volt-Seconds and Kilomaxwell-Turns

Principles of Operation

Most fluxmeters measure the total change in flux of a changing magnetic field by integrating the voltage induced in a sensing coil. Each magnetic line, maxwell, in linking a conductor induces in it a 10-8 volt-second impulse.

From the physical relationship, 1 volt = 1 weber/second and 1 weber = 108 maxwell-turns, the MTC-1 volt-second generator becomes a standard by simulating maxwell-turns from the derived relationship 1 volt-second = 108 maxwell-turns.

The MTC-1 produces an output pulse with a calibrated height (voltage) and calibrated width (time), the integral of which is height x width or volt-seconds. This volt-second pulse becomes the source by which the fluxmeter is calibrated.

Two output voltages and seven time intervals are provided which produce 14 different volt-second combinations for 11 different maxwell outputs from 104 to 109 maxwell-turns.

A 1 volt base is regulated by a precision voltage regulator IC operating with a precision divider network to produce simultaneous 1 volt and 0.01 volt output pulses.

The time base for the MTC-1 is a 3.276 MHz crystal-controlled oscillator which is divided down and buffered to provide a 100 Hz TTL compatable clock signal to the output circuit. The overall accuracy of the time base is ±0.005%.

The timer turns on the output for 1 to 1000 clock pulses producing 104 to 107 maxwell-turns at the 0.01 Volt output or 106 to 109 maxwell-turns at the 1 volt output.

Specifications

Range

2 Voltage Ranges 0.01V, 1V ±0.01%
7 time intervals: 0.01, 0.05, 0.1, 0.5, 1, 5, 10 seconds ±0.005%
14 Volt-Second output pulses corresponding to 11 Maxwell-Turn ranges. From 0.0001 to 10 Volt-Seconds; 104 to 109 Maxwell-Turns

Stability

Voltage Base: ±0.004%/°C; ±0.01% @ 25 ±10°C
Time Base: ±0.005%; -25°C to 75°C
Divider Network: ±0.0002%/°C; ±0.002% @ 25 ±10°C
Volt-Second Product: ±0.0042%/°C, ±0.005%; ±0.047% @ 25 ±10°C

Accuracy
(Factory Set)

Calibration (set voltage): ±0.01%*
Volt-Second Product: ±0.03% @ 25°C
*Depends on voltage standard used

Source
Resistance

0.01V Range 0.2 ohm
1V Range 20.0 ohm

Power
Input

105 V - 125 V 50 Hz/60 Hz Std.
210 V - 250 V 50 Hz/60 Hz Opt.
Approx. 14 VA

Physical:
   Width 8.50" (21.6cm)
   Height 4.75" (12.1cm)
   Depth 11" (27.9cm)
   Weight 6 lbs (2.7kg)

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