The Datron 4708 Autocal Multifunction Standard is a high-precision calibrator which features exceptionally high stability and full systems capability. It is characterized by a wide-range coverage of DC Voltage, AC Voltage, DC Current, AC Current and Resistance functions in a single unit. The basic instrument consists of a mainframe to which the various output options may be added. Option 10 (factory-fitted) provides a DC Voltage function. Option 20 (factory-fitted) provides an AC Voltage function. Option 30 (factory-fitted) adds calibration sources of DC Current, AC Current and Resistance. The 4708 incorporates a reference module which maintains a high accuracy specification over the ambient temperature range of 23°C ± 10°C. A high level of stability is achieved by use of super-selected reference components and ultra-stable gain-defining resistors. The ‘Autocal’ feature ensures that its 24-hour specifications are usable; not merely figures of merit. The 4708 uses a microprocessor for control management, simplifying its use in complex manual operations, such as calibration of high-quality digital multimeters. The IEEE 488 interface provides a comprehensive remote programming capability, allowing programmed calibration of the 4708 itself. Standard and Optional Facilities DC Voltage Ranges By fitting Option 10, the instrument provides DC Voltage calibration facilities in eight decade ranges from ±100fiV to ±1000V. 100% overrange is incorporated, except on the ±1000V range (see page 3-3), when the output is limited to 1100V. AC Voltage Ranges By fitting Option 20, the instrument provides AC Voltage calibration facilities in seven decade ranges from lmV to 1000V. 100% overrange is incorporated, except on the 1000V range (see page 3-3), when the output is limited to 1100V. DC Current Ranges By fitting Option 30, in conjunction with Option 10, the instrument can be used to calibrate DC Current in five decade ranges from 100)1 A to 1 A. The Datron Model 4600 may be used to extend DC Currents to 11 A. AC Current Ranges By fitting Option 30, in conjunction with Option 20, the instrument can be used to calibrate AC Current in five decade ranges from IOOjiA to 1 A. The Datron Model 4600 may be used to extend AC Currents to 11 A. Resistance By fitting Option 30, in conjunction with Option 10, the instrument can be used to calibrate resistance in eight decade ranges from 10 ohm to 100M ohm. Frequency The output frequency of the 4708 extends from 10Hz to 1MHz in five overlapping decade ranges, at a resolution of 1% of nominal Frequency Range. Any five frequency values within the range of the instrument can be stored in volatile memory. For higher accuracy, five ‘Spot Calibrated’ frequency values per Output Range can be recalled from non-volatile memory storage. Autocal All Datron AUTOCAL instruments are designed to make the removal of the covers for calibration unnecessary, as full routine calibration of all ranges and functions can be carried out from the front panel or over the IEEE 488 bus. Accidental or unauthorized use of the calibration routine is prevented by a key operated switch on the instrument rear panel. The procedure for calibrating this instrument is contained in Section 8. Resolution and Accuracy The maximum resolution is 7.5 digits with a facility for displaying the specified accuracy of any output voltage. The 4708 specifications are shown in Section 6. Resolution and Accuracy The maximum resolution is 6.5 digits with a facility for displaying the specified accuracy of any output voltage. The 4708 specifications are shown in Section 6. Resolution and Accuracy The maximum resolution is 6.5 digits with a facility for displaying the specified accuracy of output current. The 4708 specifications are shown in Section 6. Resolution and Accuracy The maximum resolution is 6.5 digits with a facility for displaying the specified accuracy of output current. The 4708 specifications are shown in Section 6. Resolution and Accuracy The maximum resolution is 7.5 digits with a facility for displaying the specified accuracy of any output resistance. The 4708 specifications are shown in Section 6. Output Deviation A user may deviate the output voltage from the output display value by introducing a gain ‘Error’ within the general range ±10%. Additionally, for DC functions, the output may be ‘offset’ by up to ±2% of the range in use, or 200|_iV, whichever is greater. Remote Sense The specified output voltage may be sensed at the load, using 4-wire connections. Remote or Local Sense is selectable from the front panel. Remote Guard This facility allows the instrument’s internal guard shields to be externally connected.