The reference that fits in your pocket.
Plain answers to the instrument questions that come up in the field, plus the calculators worth keeping. Search across every guide, ask a question, or browse below.
Calibration Error
As-Found / As-Left worksheet. Enter your readings, get error as percent of span.
Signal Scaling
Map any input span to any output. mA to engineering units and back, with percent.
Square-Root Extraction
DP flow, both directions. mA to flow and flow to mA, with the difference shown.
Flow Calculator
DP meters, SCFM against ACFM with the reference state stated, signal and pulse conversions, and live flow curves.
RTD Tables
Pt100 and Pt1000 resistance against temperature, IEC 60751. Generate a table.
Thermocouple Tables
Types J, K, T, E, N, R, S, B. Millivolts against temperature, ITS-90.
Field Formulas
The working set. mA and percent, scaling, square root, turndown, RTD and thermocouple.
Numbering Systems
The full lab: binary, octal, hex, BCD, ASCII, and two's complement.
Signals & Switches
Digital electronics on a live bench: logic levels, clocks, serial data, HART FSK on the loop, diodes, transistors, and relays.
Reference notes
Longer reference notes on the things that go wrong in the field. Written for the technician holding the meter.