Quickly verify and calibrate all the process voltage signals in your plant or in the field.  Unique to the 235 Voltage Calibrator is its ability to calibrate voltage inputs in a live loop by clipping across the 250 ohm resistor on the back of the recorder or other monitoring device – no need to disconnect any wiring!

 Calibrate DC voltage receivers with accuracy up to ±0.02% of Reading. Source up to 999.00 mV, 1.000 to 5.000 V, 0.0 to 125.0% of 1 to 5 V, 0.000 to 20.000 V and pH. Simply select from 0.000 to14.000 pH and the 235 outputs the corresponding millivolt signal to your pH transmitters and analyzers. Use the 235 as a portable 24 V supply to power 4 to 20 mA loops with up to 1,000 Ohm loads.

 Quickly set any output value with the adjustable dial plus store any three output settings for instant recall with the EZ-CHECK switch. Enable automatic stepping and ramping for fast verification of instrument linearity and to free both hands to write down your data.


  • Measure and read DC voltages
  • Calibrate recorders in live loops
  • Ranges: Up to 20V
  • Accurate to ±0.02%
  • Simulate pH probes into transmitters & analyzers
  • Measures up to 60 VDC
  • EZ-DIAL double click menu
  • Backlight easy-to-read display