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Agilent Technologies 6050A, 6051A manual Considerations For Operating In Constant Resistance Mode

Models: 6051A 6050A

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If large resistances are required, the accuracy can be improved by reading the voltage and current directly from the load, calculating the actual resistance, and then adjusting the programmed value accordingly. This technique is most practical in applications requiring a fixed resistive load.

The following examples illustrate the worst-case error possibilities resulting from op amp offsets. The examples are based on a 300-watt unit having 1 ohm, 1 kilohm, and 10 kilohm ranges. These examples do not include the effects of gain errors on accuracy (specified in percent).

Note Note that typical performance is far better than the worst-case possibilities shown here.

Example 1: 1 Ω range (0.033 Ω to 1 Ω)

The offset error for this range is specified as + 8 milliohms. Therefore, if 1 ohm is programmed, the actual resistance will be

1 Ω + 0.008 Ω = 0.992 to 1.008 Ω.

Similarly, if 0.033 ohms is programmed, the actual resistance will be

0.033 Ω ± 0.008 Ω = 0.032 to 0.048 Ω.

Example 2: 1 kΩ range: (1 Ω to 1 kΩ, or 1 S to 0.001 S)

Because this range is, in effect, a constant conductance range, offset is specified in siemens (1/ohms). Resistance, however, is programmed in ohms. Therefore, to compute the contribution of offset error to programmed value error, the programmed value must be reciprocated first. The offset is then applied to the programmed value (in siemens) and the result is once again reciprocated.

Note that 1 ohm equals 1 siemen, and 1 kilohm equals 0.001 siemens. Therefore, the conductance (0.001 siemens) at full scale resistance (1 kilohm) is a very small percentage of scale conductance.

If 1 ohm is programmed, the corresponding conductance value is 1 siemen. The actual resistance will be 1 S ± 0.008 S = 1.008 S to 0.992 S

= 0.992 Ω to 1.008 Ω

If 1 kilohm is programmed, the corresponding conductance value is 0.001 siemens. The actual resistance will be 0.001 S ± 0.008 S = 0.009 S to -0.007 S

=111 Ω to infinite Ω (typically 900 to 1100 Ω)

The load cannot provide negative current corresponding to negative siemens. Therefore, zero current translates to zero siemens, which corresponds to infinite ohms. Note also that the resistance can be as low as 111 ohms, which is much lower than 1 kilohm. This is because the current offset is large compared to the small current corresponding to 1 kilohm (0.001 siemens). For instance, 0.001 siemens corresponds to 6 milliamps at 6 volts input, and the offset specification of 0.008 siemens corresponds to 48 milliamps at 6 volts input.

Calculations for the 10 kilohm range are similar.

92 Considerations For Operating In Constant Resistance Mode

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Agilent Technologies 6050A, 6051A manual Considerations For Operating In Constant Resistance Mode
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6051A, 6050A specifications

Agilent Technologies has long been a leader in providing high-performance test and measurement solutions, and the 6050A and 6051A models exemplify this commitment to quality and innovation. The 6050A and 6051A are versatile signal generators that cater to a diverse range of applications, including research and development, manufacturing, and education, making them essential tools in laboratories and production environments.

The Agilent 6050A is a high-performance RF signal generator known for its frequency range capabilities, which span from 100 kHz to 20 GHz. It offers exceptional phase noise performance and low harmonic distortion, making it ideal for applications that require high signal integrity. The device supports various modulation formats, including AM, FM, and pulse modulation, allowing users to generate a wide range of test signals to simulate real-world conditions.

The 6051A builds upon the robust features of the 6050A with enhanced specifications and additional functionalities. It features a larger frequency modulation bandwidth, pushing the envelope for applications requiring more complex signal generation. The 6051A showcases a superior output power range, ensuring that test signals can be reliably produced at varying power levels. This model also includes advanced output control options that allow for precise signal manipulation, making it particularly suited for testing amplifiers and other RF components.

Both models share core technologies that ensure reliable performance, such as direct digital synthesis (DDS) and phase-locked loop (PLL) architectures. These technologies contribute to the exceptional frequency stability and accuracy that engineers and scientists have come to rely on. Additionally, the user-friendly interface integrated into both models simplifies operation and allows for quick configuration changes, facilitating efficient research and testing workflows.

With comprehensive connectivity options, including GPIB, USB, and Ethernet, the 6050A and 6051A can easily integrate into automated test environments. Their reliability, performance, and flexibility make them a perfect choice for those looking to advance their testing capabilities, whether in academic research, product development, or quality assurance in manufacturing.

In summary, the Agilent Technologies 6050A and 6051A signal generators are powerful tools designed to meet the demands of modern RF testing. Their advanced features, paired with Agilent’s reputation for quality and precision, make them invaluable assets in any engineering or research portfolio. Whether you require sophisticated signal generation for prototype testing or educational purposes, these models will deliver the performance needed to support your objectives.