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Graphtec- GL7-HV

Graphtec- GL7-HV

The GL7-HV is a 2-channel high-voltage input module for precise measurement of AC, DC, and RMS voltages, designed for applications such as power lines, inverters, and electric vehicles. It supports fast sampling, high input voltage, and robust safety features.

  • High-voltage capability – Measures up to 1000 V input with a 2300 Vrms withstand voltage.
  • Fast sampling – Supports 1 M Samples/s (1 μs interval) for capturing rapid voltage changes.
  • Accurate AC/DC & RMS measurement – DC/AC accuracy ±0.25% FS; RMS measurement for sine waves with response time 500 ms.
  • Robust safety & isolation – Min. 50 MΩ isolation between input and GND, 90 dB common-mode rejection.

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Description

The Graphtec GL7-HV is a high-voltage input module designed for precise and reliable voltage measurements in applications such as AC power lines, electric vehicles, and inverter-based systems. It features 2 isolated input channels with simultaneous sampling and supports DC, AC, DC-RMS, and AC-RMS measurements up to 1000 V (full scale) and 500 Vrms, with a fast sampling interval from 1 μs to 1 hour. The module ensures safe operation with a high withstand voltage of 2300 Vrms and a common-mode rejection ratio of at least 90 dB, making it suitable for monitoring high-voltage signals in industrial and automotive systems.

Equipped with DC and AC coupling, the GL7-HV can record both absolute voltage levels and small superimposed signals. It also supports real-time RMS measurement for long-term durability testing. With a frequency response up to 200 kHz, low-pass filter options, and compact dimensions (49 × 136 × 160 mm) weighing approximately 740 g, the module delivers high-precision, reliable data capture for demanding high-voltage measurement tasks.

Features

  • High-voltage capability – Measures up to 1000 V input with a 2300 Vrms withstand voltage.
  • Fast sampling – Supports 1 M Samples/s (1 μs interval) for capturing rapid voltage changes.
  • Accurate AC/DC & RMS measurement – DC/AC accuracy ±0.25% FS; RMS measurement for sine waves with response time 500 ms.
  • Robust safety & isolation – Min. 50 MΩ isolation between input and GND, 90 dB common-mode rejection.

Specifications

Item Description
Type of module Voltage measurement module – High-voltage model –
Model number GL7-HV
Number of input channels 2 channels
Input method All channels isolated unbalanced input, Simultaneous sampling,
Isolated BNC connector
Sampling speed (interval) 1 M Samples/s to 1 Sample/h (1 μs to 1 hr.)
Built in RAM 2 million samples for each channel
Input coupling and measurement AC, DC, AC-RMS, DC-RMS
Measurement range DC, AC 2, 5, 10, 20, 50, 100, 200, 500, 1000 V Full Scale
DC-RMS, AC-RMS 1, 2, 5, 10, 20, 50, 100, 200, 500 Vrms Full Scale
(Crest Factor: up to 4 in 1 to 200 Vrms range, up to 2 in 500 Vrms range)
Measurement accuracy (*1) DC, AC ±0.25% of Full Scale
DC-RMS Sine wave measurement
±0.5% of Full Scale (at 20 Hz ≤ F ≤ 1 kHz)
±1.5% of Full Scale (at 1 kHz < F ≤ 20 kHz)
Response time: 500ms (Crest Factor is up to 4)
AC-RMS Sine wave measurement
±0.5% of Full Scale (at 100 Hz ≤ F ≤ 1 kHz)
±1.5% of Full Scale (at 1 kHz < F ≤ 20 kHz)
Response time: 500 ms (Crest Factor is up to 4)
A/D converter Successive Approximation type, 16 bits (effective resolution: 1/40000 of the measuring full range in the DC and AC coupling,
1/20000 of the measuring full range in the DC-RMS, AC-RMS coupling)
Input impedance 1 MΩ ±5%
Maximum input voltage Between (+)/(-) terminal 1000 Vp-p
Between channels ((-) terminals) 300 Vrms AC
Between channel/GND 300 Vrms AC
Max. voltage (withstand) Between channels 2300 Vrms AC (1 minute)
Between channel/GND 2300 Vrms AC (1 minute)
Isolation Between input/GND Min. 50 MΩ (at 500 V DC)
Common-mode rejection ratio Min. 90 dB (50/60 Hz, Signal source impedance: Max. 300 Ω)
Frequency response DC Coupling: DC to 200 kHz (+1/-3 dB)
AC Coupling: 4Hz to 200 kHz (+1/-4.5 dB)
Filter Low pass OFF, Line (1.5 Hz), 5, 50, 500, 5k, 50k Hz (at -3 dB, 6dB/oct)
External dimensions (W×D×H) Approx. 49 x 136 x 160mm (Excluding projections)
Weight Approx. 740 g
Subject to the conditions:
● Room temperature is 23ºC ±5ºC. ● When 30 minutes
or more have elapsed after power was turned on.
● Filter is set to 10 or Line. ● Sampling rate is set to 1 second.
● GND terminal is connected to ground.

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