The Silent Partner Heavy Duty (SPHD) is an inexpensive current and/or voltage logger that is especially useful where harmonics are suspected. RMS values can be stored at different rates by the user. Inputs accept any 1 VAC full scale CT or PT. Internal rechargeable batteries continue logging in the event of a power failure.


  1. 12 Bit Resolution
  2. ± 0.25% Accuracy
  3. Measure voltage or current on any channels.
  4. Downloads with Silent Partner Pro Windows® software
  5. -40°C temperature range for extreme weather conditions.


  1. Energy Studies
  2. Industrial Monitoring
  3. Machinery and motor analysis
  4. HVAC studies
  5. Electrical Utilities
  6. Peak shaving and Load Management




Maximum Channels Three Selectable storage for 1, 2, or 3 channel operation.
Range 0 - 1 VAC input. Actual current range depends on CT used. True RMS for 50/60 Hz. operation.
External Connections Aux. power, download, and three 1 VAC inputs.  
Sensor Type External CT’s or external voltage module.  
Sampling Rate 2 to 4 seconds. Set via Silent Partner Pro software Windows®.
Storage Rate 32 seconds to 15 minutes. Set via Silent Partner Pro software Windows®.
Parameters Stored Avg, Min/Max, or Min/Max/Avg. Set via Silent Partner Pro software Windows®.
Samples per Average 16 at 32 second storage.
256 at 15 minute storage.
Set automatically, depending on storage rate.
Memory 64K non-volatile RAM.  
Memory Treatment Stop when full, or wrap. Set via Silent Partner Pro software Windows®.
Storage Capacity 87,264 readings for 1 channel, avg. only.
14,544 readings for 1 channel, min/max/avg.
Storage available depends on number of channels and storage mode.
Indicators Flashing LED when logging.  
Power Internal battery and/or adapter. Uses standard 6V.
Battery Life At least 7 days (can also operate from external adapter).  
Communications Isolated USB, support for remote setup.  
Software Silent Partner Pro software Windows®. Requires PC running Windows 32Bits and 64Bits.
Packaging Rugged, watertight Pelican Case  
Accuracy ± 0.25 % Range + CT or PT error  
Safety Isolation of measurement circuit via CT’s and PT’s CSA Special Inspection
Operating Temperature - 40ºC to 60ºC (- 40°F to 140°F) extended temp range, Relative humidity - to 90% non-condensing.  

Specifications subject to change without notice.