GM260

Overview

The Bachmann GM260 is a grid measurement module designed for precise current and voltage monitoring using True RMS methods, including harmonic analysis up to the 40th order.

Current and Voltage Measurement

• Measuring Method: True RMS (includes harmonics up to the 40th)

• Measurement Interval:

  • 50 Hz: 10 ms

  • 60 Hz: 8.33 ms

• Voltage Channels: 3

• Maximum Rated Voltage:

  • UL-L (line-to-line): 480 VRMS

  • UL-N (line-to-neutral): 277 VRMS

• Voltage Measuring Range:

  • UL-L: 70 VRMS to 625 VRMS

  • UL-N: 36 VRMS to 361 VRMS

• Accuracy: ≤ ±0.1%

• Continuous Overload Capacity:

  • UL-L: 680 VRMS

  • UL-N: 390 VRMS

• Short-Term Overload (10 × 1 s, interval 10 s):

  • UL-L: 1039 VRMS

  • UL-N: 600 VRMS

• Input Impedance: > 2 MΩ

Frequency Measurement

• Rated Frequency: 50/60 Hz

• Reference Range: 45 Hz to 65 Hz

• Accuracy: ≤ ±0.01 Hz (with average filtering down to ≤ ±0.005 Hz)

• Measurement Interval:

  • Updated at each positive zero crossing

  • 50 Hz: 20 ms

  • 60 Hz: 16.67 ms

---