The Fluke Calibration 752A Reference Divider sets the standard for ratio accuracy and ease of use. It offers two divider outputs, 10:1 and 100:1 with output uncertainties of less than 0.2 ppm and 0.5 ppm respectively. Before each use, the 752A is easily calibrated with only a stable source and a null detector. The entire procedure takes only five minutes and does not require external standards. The calibration procedure compensates for long term changes in value of the divider resistors. The upper leg of the divider is configured into three equal groups, which, when placed in parallel, form a resistor of equal value to the output resistor. These two resistors form one half of a Wheatstone bridge. The other half is composed of two calibration resistors whose positions can be interchanged in the circuit. This interchange allows correction for any difference in the values of the calibration resistors through use of the BALANCE knob on the front panel. The upper leg resistors are then matched to the output resistor with the 10:1 or 100:1 potentiometers respectively.
| Key Features |
| 10:1 and 100:1 divider outputs |
| Output uncertainty 0.2 ppm and 0.5 ppm |
| Built-in Calibration Bridge |
| Dynamic Resistor Matching™ |
| System switching for ease of use |
| Specifications |
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Fluke 752A
Reference Divider
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| Model Overview |
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| Model | Fluke 752A |
| Division Ratio |
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Division Ratio 10:1 ±0.2 ppm
Division Ratio 100:1 ±0.5 ppm
| Input: 0V to 100V
Input: 0V to 1000V
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| General Specifications * |
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| Ratio Ranges | 10:1 and 100:1 |
| Ratio Uncertainty | Ratio accuracies that apply for a temperature variation of less than ± 1°C from the self-calibration temperature (between 18°C and 28°C) for up to 8 hours following self-calibration:
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Range 10:0
Input Voltage: 0 to 100V
Output Uncertainty: 0.2 ppm
Null Accuracy: ±0.5 mV**
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Range 100:1
Input Voltage: 0 to 1000V
Output Uncertainty: 0.5 ppm
Null Accuracy: ±1.0 mV**
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| Temperature Coefficient | £ ± 1 ppm per °C over range of 18°C to 28°C (typically 0.1 ppm per °C from 15°C to 30°C |
| Input Resistance | 10:1 Ratio:
380 kΩ ± 1%
100:1 Ratio:
Divider is 4 MΩ; Driven Guard is 4 MΩ; total is 2 MΩ ± 1%
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| Maximum Input Voltage | 200V for the 10:1 ratio
1100V for the 100:1 ratio
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| Power Coefficient | £ 0.05 ppm of output with 100V applied for 10:1 ratio and £ 0.3 ppm of output with 1000V applied for 100:1 ratio (included in the ratio accuracy specifications) |
| Temperature | 0°C to 50°C, operating; -40°C to 75°C non-operating |
| Relative Humidity | £ 75% to 40°C, £ 45% to 50°C, non-condensing, operating; £ 100% 10-50°C, non-operating |
| Altitude | £ 3050m (10,000 ft) operating;£ 12,220m (40,000 ft) non-operating |
| Vibration | Per MIL-T-28800C, Type III, Class 5, Style E |
| Safety | IEC 348, 2nd edition, 1978; ANSI-C39.5, 1980, CSA 556B, and UL 1244 |
| Calibration Documentation | Statement of calibration practices included; performance check optional |
| Size | 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) |
| Weight | 8.4 kg (18.5 lbs.) |
*Specifications apply for the lifetime of the instrument over the temperature range of 18°C to 28°C.
**Null accuracy refers to the required accuracy of the null detector reading during self-calibration.
