The AP4570 offers two modes of operation: Track & Hold and Track & Peak - Hold. In "Track & Hold" operation the output tracks the input signal. When an external contact is closed, the input level is "saved" and its corresponding output signal is helped indefinitely until the contact is opened. Releasing the hold switch (pins 8 and 11) allows the output to again follow the input. The "Track & Peak-Hold" mode is similar to "Track & Hold" operation except upon contact closure (pins 8 and 11) the highest input is "saved" and the corresponding output is help until a higher signal level occurs.

Model AP4570 is useful in capturing DC-input signals to be held for further processing or signal-conditioning. Typical applications include monitoring peak electrical or energy demands, capturing process conditions such as flow rates, equipment protection and taring to factor out unwanted dead weight.

Calibration

Top-accessed screwdriver adjustments provide typical ±10% zero and span adjustability. Calibration is referred to input in that adjustments are to correct for input/sensor variations. Zero is adjusted for the specified minimum output with the input at the desired minimum. Span is adjusted for the specified maximum output with the input at the desired maximum. Repeat adjustments for maximum accuracy.

Specifications

Input Impedance

• Voltage Input: >200KÙ

• Current Input: 20Ù

Output Impedance

• Voltage Output: <10Ù

• Current Output: >100KÙ

Output Drive

• Voltage Output: 10mA, max (1KÙ, min. @ 10V)

• Current Output: 15V compliance @ 20mA (750Ù, max)

Response Time

• 100msec. typical

Linearity

• ±0.05% of span, typical

Output Resolution (digital tracking)

• 1 part in 512

Stability (15-minute warm-up)

• ±0.02%/°C typical