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Product Overview: 752A Reference Voltage Divider
The 752A reference voltage divider is both accurate and easy to use. It is available in 10:1 and 100:1 DC divider outputs with output uncertainties of less than 0.2 ppm and 0.5 ppm respectively.
The 752A Reference Voltage Divider can be easily calibrated prior to each use with only a stabilized voltage source and a zero check meter. The entire process takes only 5 minutes and does not require the use of external standards.
This calibration method corrects for long-term variations in the internal resistance of the voltage divider. For calibration, the upper arm of the voltage divider is divided into 3 equal groups. If they are connected in parallel, they form a resistor with a value equal to the output resistor. These two resistors form half of a Wheatstone bridge. The other half of the bridge consists of two calibration resistors whose positions in the circuit can be interchanged. This interchanging of positions allows us to correct the difference between the values of the two calibration resistors using the balance knob on the front panel of the instrument. In this way, the upper arm resistor is able to match the output resistor of a 10:1 or 100:1 potentiometer, respectively.
In stand-alone mode, the input voltage of the voltage divider is added to its input and can be selected by the mode switch between 10:1 and 100:1. this enables the output voltage to be obtained at the output of the voltage divider.
When the 752A Reference Voltage Divider is used in conjunction with a 10V reference source and a Zero Check Meter, the system becomes a 5 decimal voltage calibrator that compares 1000V, 100V, 10V, 1V, and 0.1V input voltages to a 10V reference standard. In this mode, the calibrated voltage source is connected to the inputs of the 752A, and instead of having to manually change the wiring, a mode switch can be used to switch the system to accommodate each range.
When the 752A is self-calibrating, the 752A voltage divider switches its resistors when the mode switch is placed in the 752A CAL position and forms a bridge circuit with two other internal resistors. The excitation signal from the bridge is connected to the input of the voltage source (the excitation signal voltage is set to 20V) and the zero check meter is switched to the position across the bridge to measure the balance of the bridge.
Product Specification: 752A Reference Voltage Divider
| partial pressure ratio | importation | Partial pressure ratio specifications (one year) |
| 10:1 | 0V to 100V | ±0.2ppm |
| 100:1 | 0V to 100V | ±0.5ppm |
| Common technical indicators* | |
| Ratio range | 10:1 and 100:1 |
| Ratio uncertainty | Ratio accuracy within ± 1°C from self-calibration temperature (from 18°C to 28°C) for 8 hours after self-calibration: -------- Range 10:0 : Input voltage: 0 to 100V Output uncertainty: 0.2 ppm Zero accuracy: ±0.5 mV** -------- Range 100:1 : Input voltage: 0 to 1000V Output uncertainty: 0.5 ppm Zero accuracy: ±1.0 mV** |
| temperature coefficient | £ ± 1 ppm/°C over the temperature range 18°C to 28°C (typical 0.1 ppm/°C over the 15°C to 30°C temperature range) |
| Input Impedance | 10:1 Ratio: 380 kΩ ± 1% 100:1 Ratio: 4 MΩ for voltage divider; 4 MΩ for protection driver; 2 MΩ total ± 1% |
| Maximum Input Voltage | 200V for a 10:1 ratio 1100V for a 100:1 ratio |
| power factor | £ 0.05 ppm output, 100V input to 10:1 ratio; £ 0.3 ppm output, 1000V input to 100:1 ratio (included in Ratio Accuracy Specification) |
| temp | Operating: 0°C to 50°C; non-operating: -40°C to 75°C |
| relative humidity | Operating: £75% (at 40°C), £45% (at 50°C), non-condensing; Non-operating: £100% (at 10°C - 50°C) |
| altitude | Operating: £3050m (10,000 ft); non-operating: £12,220m (40,000 ft) |
| strongly affect | Meets Type III, Class 5, Style E requirements of MIL-T-28800C. |
| safety | IEC 348 2nd Edition (1978); ANSI-C39.5 (1980), CSA 556B and UL 1244. |
| sizes | 19.1 cm H x 22.1 cm W x 60.3 cm L (7.53 in H x 8.69 in W x 23.75 in L) |
| weights | 8.4 kg (18.5 lbs.) |
*Technical specifications apply to the entire life cycle of the instrument over the temperature range of 18°C to 28°C.
**Zero accuracy means the accuracy of the check-zero meter reading during the calibration process.
Model: 752A Reference Voltage Divider
752A
reference divider
