The 8860A is a fully-guarded, microprocessor-controlled, 5-1/2 digit, five-function digital multimeter designed for bench-top applications. Its measurement functions include: VDC, true RMS VAC (ac coupled), true RMS VAC (decoupled), two-terminal ohms, and four-terminal ohms. Each voltage function is .provided with five ranges. Six ranges are available for each of the ohms functions. The ranges can be selected automatically (autorange) or manually. Several other performance features are provided with the 8860A. They include: • Total push-button control • Dual slope a/d conversion • Push-button zero for V dc and ohms • Selectable sample rate and resolution (4-1/2 or 5-1/2 digits) • Selectable internal/external guard connection • Selectable trigger mode: auto, manual, external • Three math functions: offset, limits and peak-to-peak. • Numeric data entry push-buttons for use in loading the constants for the offset, limits, and peak-to-peak functions. • A 5-1/2 digit measurement display (mantissa) field with sign and floating decimal point. • A two-digit exponent field with sign for displaying exponents of 10 and high, low, pass (H,L,P) limits information. Exponents are automatically displayed for recalled^data. • Measurement units annunciators that operate in conjunction with the display decimal point to display the selected range. • Overload protection for all functions and ranges. • Selectable local/remote operation. The 8860A is housed in a plastic Portable Test Instrument (PT1) case. The case includes a retractable carrying handle and a fold-down bail. When extended, the bail provides a convenient tilt for bench-top operation. The PT1 design allows the 8860A to be stacked and latched with other instruments in the Fluke PT1 product line. Stacking saves bench space and allows the instruments in the stack to be moved as a single unit. Operating power for the 8860A is selectable for the following configurations: 100, 120,220, or 240V ac ±10%; 50 or 60 Hz. The unit is shipped in the configuration specified at the time of purchase. Since the voltages are selectable, they can be reset in the field by a qualified technician. (Instructions for line voltage selection are given in the Calibration manual.)