Advantest R6144 Programmable DC Voltage/Current Source (Calibration Source) Calibration and Maintenance

Advantest R6144 Programmable DC Voltage/Current Source (Calibration Source) Calibration and Maintenance

Programmable DC voltage/current generators are indispensable excitation sources in precision instrument evaluation, temperature controller calibration, and automated testing systems. Advantest R6144 is a classic high-precision and high stability DC voltage/current generator, suitable for evaluating precision circuits and components, as well as calibrating temperature controllers. It adopts a time-sharing D/A conversion circuit, which has excellent linearity and stability, while reducing setup time and output noise, which helps to build high-throughput measurement systems. The standard GPIB and BCD parallel interfaces enable easy connection with personal computers, sequencers, or general-purpose I/O interfaces. For engineers who are using outdated calibration sources, need to replace discontinued equipment, or troubleshoot, understanding the specifications, interfaces, applications, and maintenance points of R6144 can significantly improve testing efficiency and equipment reliability.

Product positioning and core advantages

Advantest R6144 is a programmable DC voltage/current generator primarily designed for calibration and evaluation scenarios that require high precision, low noise, and fast setup. Its voltage output range can reach 32 V, current output range can reach 160 mA, and the resolution can be set up to 1 μ V and 100 nA. Under the conditions of 23 ° C ± 5 ° C, relative humidity below 70%, and constant power and load, the voltage accuracy is guaranteed to be 0.03%, the current accuracy is guaranteed to be 0.035%, and the warranty period is 6 months. The typical output noise value is 3 mVp-p, which is only one-fifth of the previous generation model; The typical establishment time is 50 ms, which is only one-third of the previous generation model. These features make it highly suitable for use in high-precision measurement systems, automated calibration tables, and production line testing equipment.

R6144 has a built-in 160 step memory and supports full digital continuous variable scanning function, which can cover a wider range of measurement applications. More importantly, the program written for the previous generation model TR6142 can run on R6144 without modification, providing great convenience for device upgrades and replacements. For users who still rely on the TR6142 program, R6144 is a smooth upgrade path.

Voltage and current output specifications

The voltage output of R6144 is divided into multiple ranges: 10 mV, 100 mV, 1 V, 10 V, and 30 V (R6144 only). Each range has a corresponding setting resolution: 10 mV range is 1 μ V, 100 mV range is 10 μ V, 1 V range is 100 μ V, 10 V range is 1 mV, and 30 V range is 2 mV. The current output is divided into three ranges: 1 mA, 10 mA, and 100 mA, with resolutions of 100 nA, 1 μ A, and 10 μ A, respectively. This multi range design enables R6144 to output small signals at the microvolt level and provide large driving currents to meet different load requirements.

In terms of accuracy, the generation accuracy of voltage range is "0.03%+range error", for example, the 10 mV range is 0.03%+5 μ V, the 100 mV range is 0.03%+25 μ V, the 1 V range is 0.03%+200 μ V, the 10 V range is 0.03%+2 mV, and the 30 V range is 0.03%+4 mV. The accuracy of current range is: 1 mA range 0.035%+300 nA, 10 mA range 0.035%+3 μ A, 100 mA range 0.04%+30 μ A. These indicators are guaranteed under the conditions of 23 ° C ± 5 ° C, relative humidity below 70%, constant power supply and load, with a warranty period of 6 months.

In terms of stability, the generated stability within one day is "0.01%+range error", for example, a 10 mV range is 0.01%+4 μ V, a 100 mV range is 0.01%+10 μ V, a 1 V range is 0.01%+50 μ V, a 10 V range is 0.01%+200 μ V, and a 30 V range is 0.01%+300 μ V; The current range is 0.01%+20 nA (1 mA), 0.01%+200 nA (10 mA), and 0.01%+2 μ A (100 mA). In terms of temperature coefficient, the voltage range varies by 20 ppm/° C plus range error/° C for every 1 ° C within the range of 0 ° C to+50 ° C. The 30 V range is 60 ppm/° C plus 4 μ V/° C; the current range is 20 ppm/° C plus 4 nA/° C (1 mA), 40 nA/° C (10 mA), 400 nA/° C (100 mA). These indicators indicate that R6144 can still maintain good output stability under changes in environmental temperature.

Load capacity, noise, and setup time

The maximum load and output resistance of R6144 vary depending on the range. For the 1 V, 10 V, and 30 V ranges, a 4-wire resistor connection is used; Other ranges are connected using 2-wire resistors. The maximum load current for a 10 mV range is 0.8 μ A (R6144), a 100 mV range is 8 μ A, a 1 V range can source 160 mA, a 10 V range can source 120 mA (R6142) or 160 mA (R6144), and a 30 V range can draw in 100 mA. In terms of output resistance, the 10 mV and 100 mV ranges are approximately 2 Ω, the 1 V range is 0.4 m Ω, the 10 V range is 4 m Ω, and the 30 V range is 8 m Ω. The output resistances for current ranges are 100 M Ω (1 mA), 10 M Ω (10 mA), and 1 M Ω (100 mA), respectively. These data help engineers determine whether R6144 is suitable for driving specific loads.

Output noise is a key indicator for calibrating sources. The noise performance of R6144 in the 1 mA, 10 mA, and 100 mA ranges under a 1 k Ω load resistance is as follows: the 10 mA range is 5 μ Vp-p in the range of 100 Hz to 10 kHz, and 10 μ Vp-p in the range of 20 Hz to 20 MHz; The 100 mA range corresponds to 15 μ Vp-p and 30 μ Vp-p; The 1 V range is 80 μ Vp-p and 150 μ Vp-p, as well as 3 mVp-p; The 10 V range is 200 μ Vp-p and 500 μ Vp-p; The 30 V range is 400 μ Vp-p and 1 mVp-p; The 1 mA range is 30 nA/p-p and 150 nA/p-p; The 10 mA range includes 300 nA/p-p and 400 nA/p-p, as well as 6 μ A/p-p; The 100 mA range is 3 μ A/p-p and 4 μ A/p-p. The low noise characteristics make it suitable for high-sensitivity measurements.

In terms of establishment time, when the limiter is set to maximum and the output changes from zero to full range, the maximum time for all ranges to reach the expected value ± 0.1% at maximum load resistance is 50 ms; For the 1 V, 10 V, and 30 V ranges, the maximum setup time is also 50 ms under a 30 μ F capacitor load; Under a 100 μ F capacitor load, the maximum setup time is 60 ms. Overshoot/undershoot is within the indicator range. These features help improve the throughput of automated testing.

Interface, programming, and memory functionality

R6144 comes standard with GPIB and BCD parallel interfaces, making it easy to connect with personal computers, sequencers, or general-purpose I/O interfaces. The GPIB interface supports standard commands, making it easy to build automated testing systems. The BCD parallel interface is suitable for connecting with traditional devices or PLCs. The built-in 160 step memory allows users to store and call multiple output settings, supports full digital continuous variable scanning function, and can automatically execute complex voltage/current scanning sequences. In terms of program compatibility, programs written for TR6142 can run directly on R6144 without modification, greatly reducing upgrade costs.

During programming, users can set voltage/current values, range, limiting, polarity, etc. through the front panel buttons or remote interface. The display of R6144 adopts high brightness LED, which can clearly display the set value and output status. The front panel also includes control areas such as Polarity, OPERATE, GP-IB, as well as output terminals. The rear panel provides GPIB connectors, BCD interfaces, power inputs, etc.

Typical application scenarios

R6144 is suitable for various precision measurement and calibration scenarios. Firstly, the evaluation of precision circuits and components, such as operational amplifiers ADC/DAC、 Sensor signal conditioning circuits require high-precision and low-noise excitation sources. Secondly, for the calibration of temperature controllers, R6144 can output precise millivolt level signals to simulate the output of thermocouples or RTDs, thereby calibrating the temperature controller. Thirdly, the automated testing system, R6144's GPIB interface and 160 step memory enable it to be integrated into production line testing equipment, achieving fast and repeatable testing. Fourth, precision measurement in scientific research laboratories, such as semiconductor device characteristic analysis, material research, etc. Fifth, as a standard source for calibrating other voltage/current meters or data acquisition systems.

Engineering process for replacing discontinued modules

When the original calibration source is discontinued or malfunctioning, R6144 can be used as an alternative, especially if the original equipment is TR6142 or other similar models. The suggested replacement process is as follows:

Record the original device parameters: voltage/current range, resolution, accuracy, noise, setup time, interface type, memory steps, size, and power requirements.

Match application requirements: Confirm whether the output range, resolution, accuracy, and noise of R6144 meet the requirements of the tested device. For example, if a 32 V output is required, the 30 V range of R6144 can cover it; If a current of 160 mA is required, the 100 mA range may not be sufficient, and it is necessary to confirm if there are higher current models available.

Confirm interface compatibility: Does the original system use GPIB or BCD parallel interface? R6144 supports both, but requires the correct address and communication parameters to be configured.

Check program compatibility: If the original device is TR6142, R6144 can directly run the program written for it without modification. Otherwise, it is necessary to rewrite the test sequence.

Confirm power supply and mechanical dimensions: R6144 offers multiple power options (90-110 V, 103-132 V, 198-242 V, 207-250 V), depending on the on-site power supply selection. The size is approximately 240 × 88 × 350 mm and the weight is about 4 kg. The rack space needs to be confirmed.

Power on test: First, do not connect the load, check the output zero point and full range, then connect the load to check the setup time and noise. Verify accuracy using a high-precision multimeter.

Calibration and verification: It is recommended to calibrate before use or confirm that the equipment is within the calibration validity period.

Common faults and troubleshooting

R6144 may encounter the following faults during use:

No output: Check if the power cord is connected and if the fuse is blown. The R6144 attachment includes 100/120 V and 220/240 V fuses, which need to be selected according to the power supply voltage. Check if the output terminals are in good contact, if the limiter is set to zero, and if the OPERATE key is pressed.

Inaccurate output value: Check if the range setting is correct and if the load is within the allowable range. If the load is too large, it may cause the output to drop. Check if calibration is required. Environmental temperature changes may also affect accuracy, ensuring use within the range of 23 ° C ± 5 ° C.

High output noise: Check if the load resistance and capacitance are within the allowable range. If the load capacitance is too large, it may lead to increased noise or longer setup time. Check if the grounding is good and avoid grounding loops. Connect the load using shielded cables.

GPIB communication failure: Check GPIB cable connection and confirm address settings are correct. Check the GPIB card and driver program on the computer. Using * IDN? Test communication with standard commands. If using BCD interface, check the parallel port settings.

Overload or protection: R6144 has a limiting function, which may trigger protection if the output exceeds the set limit. Check if the limit setting is reasonable. Avoid output short circuit or overload.

Display abnormality: Check if the power supply voltage is stable and if the fuse is intact. If the display flashes or goes off, it may be a power issue.

Maintenance and calibration recommendations

To maintain the accuracy and reliability of R6144, it is recommended to perform regular maintenance and calibration. Firstly, keep the equipment clean and prevent dust from entering the heat dissipation holes. Secondly, regularly check the fuses and power cords. Thirdly, calibrate according to the manufacturer's recommended cycle, usually 6 months or 1 year, depending on the frequency of use and accuracy requirements. Higher precision standard sources, such as an 8.5-digit multimeter, should be used for calibration. Fourth, avoid using in environments above 50 ° C, with a relative humidity not exceeding 85%. Fifth, when not in use for a long time, it should be stored in an environment between -25 ° C and+70 ° C. Sixth, if the equipment malfunctions, do not disassemble it by yourself and contact a professional for repair.